CN111073628A - Perovskite quantum dot-polymer composite and light emitting device - Google Patents

Abstract

The application discloses a perovskite quantum dot-polymer composite and a light-emitting device. The perovskite quantum dot-polymer composite comprises perovskite quantum dots and a polymer matrix, wherein the perovskite quantum dots are dispersed in the polymer matrix; in the perovskite quantum dot-polymer composite, the weight percentage of the perovskite quantum dots is marked as C; the peak wavelength of the emission peak of the perovskite quantum dot-polymer complex under the excitation of blue light is recorded as lambda; when C is 2 wt% or more and 5 wt% or less, lambda is positively correlated with C.

Description

Perovskite quantum dot-polymer composite and light emitting device

Technical Field

The application relates to the field of luminescent materials, in particular to a perovskite quantum dot-polymer complex and a luminescent device.

Background

Perovskite quantum dots are one of the research hotspots in the field of semiconductor luminescent materials due to the superior optical properties such as easy tuning of luminescence, narrow emission spectrum, high quantum efficiency and the like. The perovskite quantum dots show great application prospect in the next generation display field.

Light emitting devices based on perovskite quantum dots used as backlight units for liquid crystal displays may emit white light. White light can be constructed by a combination of blue light emitting diodes and phosphors or perovskite quantum dots, which require perovskite quantum dots having appropriate emission peak peaks. Finding out the perovskite quantum dot intermediate product with the required emission peak value has important significance for the application of the perovskite quantum dot.

Disclosure of Invention

It is an object of the present application to provide a perovskite quantum dot-polymer composite.

According to a first aspect of the present application, there is provided a perovskite quantum dot-polymer composite comprising perovskite quantum dots and a polymer matrix, the perovskite quantum dots being dispersed in the polymer matrix; in the perovskite quantum dot-polymer composite, the weight percentage of the perovskite quantum dots is marked as C; the peak wavelength of the emission peak of the perovskite quantum dot-polymer complex under the excitation of blue light is recorded as lambda; when C is 2 wt% or more and 5 wt% or less, lambda is positively correlated with C.

Further, in the case where C is 1 wt% or more and 10 wt% or less, λ and C show a positive correlation.

Further, in the case where C is 0.5 wt% or more and 12 wt% or less, λ and C show a positive correlation.

Further, the perovskite quantum dot is a compound represented by chemical formula 1:

chemical formula 1: [ A ]][B][X]₃Wherein, in chemical formula 1,

a is at least one monovalent organic cation, at least one monovalent inorganic cation, or any combination thereof,

b is at least one divalent inorganic cation, and

x is at least one monovalent anion.

Further, A is (R)₁R₂R₃C)⁺、(R₁R₂R₃R₄N)⁺、(R₁R₂R₃R₄P)⁺、(R₁R₂R₃R₄As)⁺、(R₁R₂R₃R₄Sb)⁺、(R₁R₂N＝C(R₃)-NR₄R₅)⁺Substituted or unsubstituted cycloheptatriene, substituted or unsubstituted monovalent cation of nitrogen-containing five-membered ring, substituted or unsubstituted monovalent cation of nitrogen-containing six-membered ring, Li⁺、Na⁺、K⁺、Rb⁺、Cs⁺、Fr⁺Or any combination thereof,

R₁to R₅Each independently selected from hydrogen, deuterium, -F, -Cl, -Br, -I, hydroxy, substituted or unsubstituted C₁-C₆₀Alkyl, substituted or unsubstituted C_2-C60Alkenyl, substituted or unsubstituted C₂-C₆₀Alkynyl, substituted or unsubstituted C₁-C₆₀Alkoxy, substituted or unsubstituted C₆-C₆₀Aryl or-N (Q)₁)(Q₂)，

At least one substituent of the substituted cycloheptatriene, the monovalent cation of the substituted nitrogen-containing five-membered ring, and the monovalent cation of the substituted nitrogen-containing six-membered ring is selected from deuterium, -F, -Cl, -Br, -I, hydroxyl, substituted or unsubstituted C₁-C₆₀Alkyl, substituted or unsubstituted C₂-C₆₀Alkenyl, substituted or unsubstituted C₂-C₆₀Alkynyl, substituted or unsubstituted C₁-C₆₀Alkoxy, substituted or unsubstituted C₆-C₆₀Aryl or-N (Q)₃)(Q₄) And is and

Q₁to Q₄Each independently selected from hydrogen, deuterium, hydroxy, C₁-C₆₀Alkyl radical, C₂-C₆₀Alkenyl radical, C₂-C₆₀Alkynyl, C₁-C₆₀Alkoxy or C₆-C₆₀And (4) an aryl group.

Further, A is (NH)₄)⁺、(PH₄)⁺、(AsH₄)⁺、(SbH₄)⁺、(NF₄)⁺、(PF₄)⁺、(NCl₄)⁺、(PCl₄)⁺、(CH₃NH₃)⁺、(CH₃PH₃)⁺、(CH₃AsH₃)⁺、(CH₃SbH₃)⁺、((CH₃)₂NH₂)⁺、((CH₃)₂PH₂)⁺、((CH₃)₂AsH₂)⁺、((CH₃)₂SbH₂)⁺、((CH₃)₃NH)⁺、((CH₃)₃PH)⁺、((CH₃)₃AsH)⁺、((CH₃)₃SbH)⁺、((CH₃CH₂)NH₃)⁺、((CH₃CH₂)PH₃)⁺、((CH₃CH₂)AsH₃)⁺、((CH₃CH₂)SbH₃)⁺、(CH₂N₂H₄)⁺、(C₇H₇)⁺、(NH₃OH)⁺、(NH₃NH₂)⁺、((CH₂)₃NH₂)⁺、(CH(NH₂)₂)⁺、(C₃N₂H₅)⁺、(NC₄H₈)⁺、((NH₂)₃C)⁺、K⁺、Rb⁺、Cs⁺Or any combination thereof.

Further, B is a divalent cation of a rare earth metal, a divalent cation of an alkaline earth metal, a divalent cation of a transition metal, a divalent cation of a late transition metal, or any combination thereof.

Further, B is La²⁺、Ce2+、Pr²⁺、Nd²⁺、Pm²⁺、Eu²⁺、Gd²⁺、Tb²⁺、Ho²⁺、Er²⁺、Tm²⁺、Yb²⁺、Lu²⁺、Be²⁺、Mg²⁺、Ca²⁺、Sr²⁺、Ba²⁺、Ra²⁺、Pb²⁺、Sn²⁺Or any combination thereof.

Further, X is at least one halide anion.

According to another aspect of the present application, there is provided a light emitting device including a light source and a light conversion layer including the above perovskite quantum dot-polymer composite;

the perovskite quantum dot-polymer composite absorbs at least a portion of light emitted by the light source and emits light having a wavelength range different from that of the absorbed light.

The application has the following beneficial effects: the perovskite quantum dot-polymer composite has good positive correlation between the peak wavelength lambda of the emission peak and the weight percent C of the perovskite quantum dot. By changing the value of the weight percentage C, a perovskite quantum dot-polymer composite body with a preset wavelength can be obtained, so that the perovskite quantum dot-polymer composite body can be particularly conveniently applied to a backlight unit (BLU) of a liquid crystal display device, indoor or outdoor lighting, stage lighting or decorative lighting.

Drawings

Fig. 1 and 2 are schematic views of structures of light emitting apparatuses according to exemplary embodiments of the present application.

Detailed Description

The technical solutions in the examples of the present application will be described in detail below with reference to the embodiments of the present application. It should be noted that the described embodiments are only some embodiments of the present application, and not all embodiments.

According to some exemplary embodiments of the present application, there is provided a perovskite quantum dot-polymer composite comprising perovskite quantum dots and a polymer matrix, the perovskite quantum dots being dispersed in the polymer matrix; in the perovskite quantum dot-polymer composite, the weight percentage of the perovskite quantum dots is marked as C; the peak wavelength of the emission peak of the perovskite quantum dot-polymer complex under the excitation of blue light is recorded as lambda; when C is 2 wt% or more and 5 wt% or less, lambda is positively correlated with C. C is preferably 2 wt%, 2.5 wt%, 3 wt%, 3.5 wt%, 4 wt%, 4.5 wt%, 5 wt%.

When the lambda is positively correlated with the C, the lambda is increased along with the increase of the C; as C decreases, λ also decreases. That is, the two variables have the same direction of change, and when one variable changes from large to small or from small to large, the other variable also changes from large to small or from small to large. Thus, the peak emission wavelength lambda of the perovskite quantum dot-polymer composite can be adjusted by simply changing the weight percentage C of the perovskite quantum dots while keeping the same perovskite quantum dots and the same polymer matrix.

As used herein, the term "perovskite" refers to a compound having a perovskite crystal structure. The perovskite crystal structure is meant to correspond to CaTiO₃A three-dimensional (3D) crystal structure of the crystal structure of (a). The term "quantum dot" is a nanoparticle having three-dimensional dimensions of less than 100 nanometers.

According to some exemplary embodiments of the present application, there is provided a perovskite quantum dot-polymer composite comprising perovskite quantum dots and a polymer matrix, the perovskite quantum dots being dispersed in the polymer matrix; in the perovskite quantum dot-polymer composite, the weight percentage of the perovskite quantum dots is marked as C; the peak wavelength of the emission peak of the perovskite quantum dot-polymer complex under the excitation of blue light is recorded as lambda; when C is 1 wt% or more and 10 wt% or less, lambda is positively correlated with C. C is preferably 1 wt%, 2 wt%, 3 wt%, 4 wt%, 5 wt%, 6 wt%, 7 wt%, 8 wt%, 9 wt%, 10 wt%.

According to some exemplary embodiments of the present application, there is provided a perovskite quantum dot-polymer composite comprising perovskite quantum dots and a polymer matrix, the perovskite quantum dots being dispersed in the polymer matrix; in the perovskite quantum dot-polymer composite, the weight percentage of the perovskite quantum dots is marked as C; the peak wavelength of the emission peak of the perovskite quantum dot-polymer complex under the excitation of blue light is recorded as lambda; when C is 0.5 wt% or more and 12 wt% or less, lambda is positively correlated with C. C is preferably 0.5 wt%, 0.7 wt%, 1 wt%, 2 wt%, 3 wt%, 4 wt%, 5 wt%, 6 wt%, 7 wt%, 8 wt%, 9 wt%, 10 wt%, 11 wt%, 12 wt%.

The perovskite quantum dot is a compound represented by chemical formula 1, chemical formula 1: [ A ]][B][X]₃. Wherein, in chemical formula 1, A is at least one monovalent organic cation, at least one monovalent inorganic cation, or any thereofIn combination, B is at least one divalent inorganic cation, and X is at least one monovalent anion.

In some exemplary embodiments of the present application, in chemical formula 1, a is (R)₁R₂R₃C)⁺、(R₁R₂R₃R₄N)⁺、(R₁R₂R₃R₄P)⁺、(R₁R₂R₃R₄As)⁺、(R₁R₂R₃R₄Sb)⁺、(R₁R₂N＝C(R₃)-NR₄R₅)⁺Substituted or unsubstituted cycloheptatriene, substituted or unsubstituted monovalent cation of nitrogen-containing five-membered ring, substituted or unsubstituted monovalent cation of nitrogen-containing six-membered ring, Li⁺、Na⁺、K⁺、Rb⁺、Cs⁺、Fr⁺Or any combination thereof.

R₁To R₅Each independently selected from hydrogen, deuterium, -F, -Cl, -Br, -I, hydroxy, substituted or unsubstituted C₁-C₆₀Alkyl, substituted or unsubstituted C₂-C₆₀Alkenyl, substituted or unsubstituted C₂-C₆₀Alkynyl, substituted or unsubstituted C₁-C₆₀Alkoxy, substituted or unsubstituted C₆-C₆₀Aryl or-N (Q)₁)(Q₂)。

At least one substituent of the substituted cycloheptatriene, the monovalent cation of the substituted nitrogen-containing five-membered ring, and the monovalent cation of the substituted nitrogen-containing six-membered ring is selected from deuterium, -F, -Cl, -Br, -I, hydroxyl, substituted or unsubstituted C₁-C₆₀Alkyl, substituted or unsubstituted C₂-C₆₀Alkenyl, substituted or unsubstituted C₂-C₆₀Alkynyl, substituted or unsubstituted C₁-C₆₀Alkoxy, substituted or unsubstituted C₆-C₆₀Aryl or-N (Q)₃)(Q₄) And Q is₁To Q₄Each independently selected from hydrogen, deuterium, hydroxy, C₁-C₆₀Alkyl radical, C₂-C₆₀Alkenyl radical, C₂-C₆₀Alkynyl, C₁-C₆₀Alkoxy or C₆-C₆₀And (4) an aryl group.

As used herein, the phrases "nitrogen-containing five-membered ring" and "nitrogen-containing six-membered ring" refer to an organic cyclic group that includes at least one nitrogen (N) and at least one carbon (C) atom as ring-forming atoms.

For example, a "nitrogen-containing five-membered ring" group can be imidazole, pyrazole, thiazole, oxazole, pyrrolidine, pyrroline, pyrrole, or triazole, and a "nitrogen-containing six-membered ring" group can be pyridine, pyridazine, pyrimidine, pyrazine, or piperidine. However, the exemplary embodiments of the present application are not limited thereto.

For example, in chemical formula 1, A may be (R)₁R₂R₃C)⁺、(R₁R₂R₃R₄N)⁺、(R₁R₂R₃R₄P)⁺、(R₁R₂R₃R₄As)⁺、(R₁R₂R₃R₄Sb)⁺、(R₁R₂N＝C(R₃)-NR₄R₅)⁺Substituted or unsubstituted cycloheptatriene, substituted or unsubstituted imidazole, substituted or unsubstituted pyridine, substituted or unsubstituted pyridazine, substituted or unsubstituted pyrimidine, substituted or unsubstituted pyrazine, substituted or unsubstituted pyrazole, substituted or unsubstituted thiazole, substituted or unsubstituted oxazole, substituted or unsubstituted piperidine, substituted or unsubstituted pyrrolidine, substituted or unsubstituted pyrroline, substituted or unsubstituted pyrrole, substituted or unsubstituted triazole, Li⁺、Na⁺、K⁺、Rb⁺、Cs⁺、Fr⁺Or any combination thereof.

R₁To R₅May each be independently selected from: hydrogen, deuterium, -F, -Cl, -Br, -I, hydroxy, C₁-C₂₀Alkyl or C₁-C₂₀An alkoxy group; c each substituted by at least one member selected from the group consisting of₁-C₂₀Alkyl and C₁-C₂₀Alkoxy groups: deuterium, -F, -Cl, -Br, -I or hydroxy;phenyl, naphthyl, biphenyl, or terphenyl; phenyl, naphthyl, biphenyl, and terphenyl, each substituted with at least one selected from the group consisting of: deuterium, -F, -Cl, -Br, -I, hydroxy, C₁-C₂₀Alkyl or C₁-C₂₀An alkoxy group; and-N (Q)₁)(Q₂)。

At least one substituent of the substituted cycloheptatriene, at least one substituent of the substituted imidazole, at least one substituent of the substituted pyridine, at least one substituent of the substituted pyridazine, at least one substituent of the substituted pyrimidine, at least one substituent of the substituted pyrazine, at least one substituent of the substituted pyrazole, at least one substituent of the substituted thiazole, at least one substituent of the substituted oxazole, at least one substituent of the substituted piperidine, at least one substituent of the substituted pyrrolidine, at least one substituent of the substituted pyrroline, at least one substituent of the substituted pyrrole, and at least one substituent of the substituted triazole may be selected from the group consisting of: deuterium, -F, -Cl, -Br, -I, hydroxy, C₁-C₂₀Alkyl or C₁-C₂₀An alkoxy group; c each substituted by at least one member selected from the group consisting of₁-C₂₀Alkyl and C₁-C₂₀Alkoxy groups: deuterium, -F, -Cl, -Br, -I or hydroxy; phenyl, naphthyl, biphenyl, or terphenyl; phenyl, naphthyl, biphenyl, and terphenyl, each substituted with at least one selected from the group consisting of: deuterium, -F, -Cl, -Br, -I, hydroxy, C₁-C₂₀Alkyl or C₁-C₂₀An alkoxy group; and-N (Q)₃)(Q₄)。

Q₁To Q₄Can be independently selected from hydrogen, deuterium, hydroxyl and C₁-C₂₀Alkyl radical, C₁-C₂₀Alkoxy, phenyl, naphthyl, biphenyl, or terphenyl.

In some exemplary embodiments of the present application, in chemical formula 1, a may be (R)₁R₂R₃R₄N)⁺、(R₁R₂R₃R₄P)⁺、(R₁R₂R₃R₄As)⁺、(R₁R₂R₃R₄Sb)⁺、Li⁺、Na⁺、K⁺、Rb⁺、Cs⁺、Fr⁺Or any combination thereof. R₁To R₄Can be independently selected from hydrogen, deuterium, -F, -Cl, -Br, -I, hydroxyl and C₁-C₂₀Alkyl radical, C₁-C₂₀Alkoxy or-N (Q)₁)(Q₂)。Q₁And Q₂Can be independently selected from hydrogen, deuterium, hydroxyl and C₁-C₂₀Alkyl or C₁-C₂₀An alkoxy group.

In some exemplary embodiments of the present application, in chemical formula 1, a may be (R)₁R₂R₃R₄N)⁺、K⁺、Rb⁺、Cs⁺Or any combination thereof. R₁To R₄Can be independently selected from hydrogen, deuterium, -F, -Cl, -Br, -I, hydroxyl and C₁-C₂₀Alkyl radical, C₁-C₂₀Alkoxy or-N (Q)₁)(Q₂)。Q₁And Q₂Can be independently selected from hydrogen, deuterium, hydroxyl and C₁-C₂₀Alkyl or C₁-C₂₀An alkoxy group.

In some exemplary embodiments of the present application, in chemical formula 1, a is (NH)₄)⁺、(PH₄)⁺、(AsH₄)⁺、(SbH₄)⁺、(NF₄)⁺、(PF₄)⁺、(NCl₄)⁺、(PCl₄)⁺、(CH₃NH₃)⁺、(CH₃PH₃)⁺、(CH₃AsH₃)⁺、(CH₃SbH₃)⁺、((CH₃)₂NH₂)⁺、((CH₃)₂PH₂)⁺、((CH₃)₂AsH₂)⁺、((CH₃)₂SbH₂)⁺、((CH₃)₃NH)⁺、((CH₃)₃PH)⁺、((CH₃)₃AsH)⁺、((CH₃)₃SbH)⁺、((CH₃CH₂)NH₃)⁺、((CH₃CH₂)PH₃)⁺、((CH₃CH₂)AsH₃)⁺、((CH₃CH₂)SbH₃)⁺、(CH₂N₂H₄)⁺、(C₇H₇)⁺、(NH₃OH)⁺、(NH₃NH₂)⁺、((CH₂)₃NH₂)⁺、(CH(NH₂)₂)⁺、(C₃N₂H₅)⁺、(NC₄H₈)⁺、((NH₂)₃C)⁺、K⁺、Rb⁺、Cs⁺Or any combination thereof. However, the exemplary embodiments of the present application are not limited thereto.

In chemical formula 1, B may be at least one divalent inorganic cation. For example, B in chemical formula 1 may be one divalent inorganic cation or a combination of at least two different divalent inorganic cations.

In some exemplary embodiments of the present application, B may be a divalent cation of a rare earth metal, a divalent cation of an alkaline earth metal, a divalent cation of a transition metal, a divalent cation of a late transition metal, or any combination thereof. For example, B may be La²⁺、Ce²⁺、Pr²⁺、Nd²⁺、Pm²⁺、Eu²⁺、Gd²⁺、Tb²⁺、Ho²⁺、Er²⁺、Tm²⁺、Yb²⁺、Lu²⁺、Be²⁺、Mg²⁺、Ca²⁺、Sr²⁺、Ba^{2 +}、Ra²⁺、Pb²⁺、Sn²⁺Or any combination thereof.

In some exemplary embodiments of the present application, B may be Tm²⁺(ii) a And La²⁺、Ce²⁺、Pr²⁺、Nd²⁺、Pm²⁺、Eu²⁺、Gd²⁺、Tb²⁺、Ho²⁺、Er²⁺、Yb²⁺、Lu²⁺、Be²⁺、Mg²⁺、Ca²⁺、Sr²⁺、Ba²⁺、Ra²⁺、Pb²⁺、Sn²⁺Or any combination thereof. However, the exemplary embodiments of the present application are not limited thereto.

In chemical formula 1, X may be at least one monovalent anion. For example, X can be one monovalent anion or a combination of at least two different monovalent anions.

In some exemplary embodiments of the present application, in chemical formula 1, X may be at least one halogen anion, for example, F-, Cl-, Br-, or I-. For example, X in formula 1 can be at least one halide anion or a combination of at least two different halide anions.

In some exemplary embodiments of the present application, X in chemical formula 1 may be iodide ion (I-). However, the exemplary embodiments of the present application are not limited thereto.

In some exemplary embodiments of the present application, the perovskite compound of chemical formula 1 may be selected from [ CH [ ]₃NH₃][Pb][I]₃、[CH₃NH₃][Pb_nSr_(1-n)][I]₃、[CH₃NH₃][Pb_nMg_(1-n)][I]₃、[CH₃NH₃][Pb_nCa_(1-n)][I]₃、[CH₃NH₃][Pb_nBa_(1-n)][I]₃、[CH₃NH₃][Pb_nEu_(1-n)][I]₃、[CH₃NH₃][Pb_nYb_(1-n)][I]₃、[CH₃NH₃][Pb_nTm_(1-n)][I]₃、[CH₃NH₃][Pb_nLa_(1-n)][I]₃、[CH₃NH₃][Pb_nCe_(1-n)][I]₃、[CH₃NH₃][Pb_nPr_(1-n)][I]₃、[CH₃NH₃][Pb_nNd_(1-n)][I]₃、[CH₃NH₃][Pb_nPm_(1-n)][I]₃、[CH₃NH₃][PbnGd_(1-n)][I]₃、[CH₃NH₃][Pb_nTb_(1-n)][I]₃、[CH₃NH₃][Pb_nHo_(1-n)][I]₃、[CH₃NH₃][Pb_nEr_(1-n)][I]₃、[Cs][Pb][I]₃、[Cs][Pb_nSr_(1-n)][I]₃、[Cs][Pb_nMg_(1-n)][I]₃、[Cs][Pb_nCa_(1-n)][I]₃、[Cs][Pb_nBa_(1-n)][I]₃、[Cs][Pb_nEu_(1-n)][I]₃、[Cs][Pb_nYb_(1-n)][I]₃、[Cs][Pb_nTm_(1-n)][I]]₃、[Cs][Pb_nLa_(1-n)][I]₃、[Cs][Pb_nCe_(1-n)][I]₃、[Cs][Pb_nPr_(1-n)][I]₃、[Cs][Pb_nNd_(1-n)][I]₃、[Cs][Pb_nPm_(1-n)][I]₃、[Cs][Pb_nGd_(1-n)][I]₃、[Cs][Pb_nTb_(1-n)][I]₃、[Cs][Pb_nHo_(1-n)][I]₃、[Cs][Pb_nEr_(1-n)][I]₃、[Rb][Pb][I]₃、[Rb][Pb_nSr_(1-n)][I]₃、[Rb][Pb_nMg_(1-n)][I]₃、[Rb][Pb_nCa_(1-n)][I]₃、[Rb][Pb_nBa_(1-n)][I]₃、[Rb][Pb_nEu_(1-n)][I]₃、[Rb][Pb_nYb_(1-n)][I]₃、[Rb][Pb_nTm_(1-n)][I]₃、[Rb][Pb_nLa_(1-n)][I]₃、[Rb][Pb_nCe_(1-n)][I]₃、[Rb][Pb_nPr_(1-n)][I]₃、[Rb][Pb_nNd_(1-n)][I]₃、[Rb][Pb_nPm_(1-n)][I]₃、[Rb][Pb_nGd_(1-n)][I]₃、[Rb][Pb_nTb_(1-n)][I]₃、[Rb][Pb_nHo_(1-n)][I]₃、[Rb][Pb_nEr_(1-n)][I]₃、[K][Pb][I]₃、[K][Pb_nSr_(1-n)][I]₃、[K][Pb_nMg_(1-n)][I]₃、[K][Pb_nCa_(1-n)][I]₃、[K][Pb_nBa_(1-n)][I]₃、[K][Pb_nEu_(1-n)][I]₃、[K][Pb_nYb_(1-n)][I]₃、[K][Pb_nTm_(1-n)][I]₃、[K][Pb_nLa_(1-n)][I]₃、[K][Pb_nCe_(1-n)][I]₃、[K][Pb_nPr_(1-n)][I]₃、[K][Pb_nNd_(1-n)][I]₃、[K][Pb_nPm_(1-n)][I]₃、[K][Pb_nGd_(1-n)][I]₃、[K][Pb_nTb_(1-n)][I]₃、[K][Pb_nHo_(1-n)][I]₃、[K][Pb_nEr_(1-n)][I]₃、[CH₃NH₃][Tm][I]₃、[CH₃NH₃][Tm_nSr_(1-n)][I]₃、[CH3NH3][Tm_nMg₍1_-n)][I]3、[CH3NH3][Tm_nCa₍1_-n)][I]3、[CH3NH3][Tm_nBa₍1_-n)][I]3、[CH₃NH₃][Tm_nEu_(1-n)][I]₃、[CH₃NH₃][Tm_nYb_(1-n)][I]₃、[CH₃NH₃][Tm_nLa_(1-n)][I]₃、[CH₃NH₃][Tm_nCe_(1-n)][I]₃、[CH₃NH₃][Tm_nPr_(1-n)][I]₃、[CH₃NH₃][Tm_nNd_(1-n)][I]₃、[CH₃NH₃][Tm_nPm_(1-n)][I]₃、[CH₃NH₃][Tm_nGd_(1-n)][I]₃、[CH₃NH₃][Tm_nTb_(1-n)][I]₃、[CH₃NH₃][Tm_nHo_(1-n)][I]₃、[CH₃NH₃][Tm_nEr_(1-n)][I]₃、[Cs][Tm][I]₃、[Cs][Tm_nSr₍1_-n)][I]3、[Cs][Tm_nMg₍1_-n)][I]3、[Cs][Tm_nCa₍1_-n)][I]3、[Cs][Tm_nBa₍1_-n)][I]3、[Cs][Tm_nEu_(1-n)][I]₃、[Cs][Tm_nYb_(1-n)][I]₃、[Cs][Tm_nLa_(1-n)][I]₃、[Cs][Tm_nCe_(1-n)][I]₃、[Cs][Tm_nPr_(1-n)][I]₃、[Cs][Tm_nNd_(1-n)][I]₃、[Cs][Tm_nPm_(1-n)][I]₃、[Cs][Tm_nGd_(1-n)][I]₃、[Cs][Tm_nTb_(1-n)][I]₃、[Cs][Tm_nHo_(1-n)][I]₃、[Cs][Tm_nEr_(1-n)][I]₃Or any combination thereof.

In some exemplary embodiments of the present application, n may be a real number satisfying the condition 0< n < 1. For example, n may be a real number that satisfies the condition 0< n ≦ 0.6. In some exemplary embodiments of the present application, n may be a real number satisfying the condition 0.001 ≦ n ≦ 0.6. In some exemplary embodiments of the present application, n may be a real number satisfying the condition 0.05 ≦ n ≦ 0.4. However, the exemplary embodiments of the present application are not limited thereto.

In some exemplary embodiments of the present application, X in chemical formula 1 may be bromide ion (Br-). However, the exemplary embodiments of the present application are not limited thereto.

In some exemplary embodiments of the present application, the perovskite compound of chemical formula 1 may be selected from [ CH [ ]₃NH₃][Pb][Br]₃、[CH₃NH₃][Pb_nSr_(1-n)][Br]₃、[CH₃NH₃][Pb_nMg_(1-n)][Br]₃、[CH₃NH₃][Pb_nCa_(1-n)][Br]₃、[CH₃NH₃][Pb_nBa_(1-n)][Br]₃、[CH₃NH₃][Pb_nEu_(1-n)][Br]₃、[CH₃NH₃][Pb_nYb_(1-n)][Br]₃、[CH₃NH₃][Pb_nTm_(1-n)][Br]₃、[CH₃NH₃][Pb_nLa_(1-n)][Br]₃、[CH₃NH₃][Pb_nCe_(1-n)][Br]₃、[CH₃NH₃][Pb_nPr_(1-n)][Br]₃、[CH₃NH₃][Pb_nNd_(1-n)][Br]₃、[CH₃NH₃][Pb_nPm_(1-n)][Br]₃、[CH₃NH₃][PbnGd_(1-n)][Br]₃、[CH₃NH₃][Pb_nTb_(1-n)][Br]₃、[CH₃NH₃][Pb_nHo_(1-n)][Br]₃、[CH₃NH₃][Pb_nEr_(1-n)][Br]₃、[Cs][Pb][Br]₃、[Cs][Pb_nSr_(1-n)][Br]₃、[Cs][Pb_nMg_(1-n)][Br]₃、[Cs][Pb_nCa_(1-n)][Br]₃、[Cs][Pb_nBa_(1-n)][Br]₃、[Cs][Pb_nEu_(1-n)][Br]₃、[Cs][Pb_nYb_(1-n)][Br]₃、[Cs][Pb_nTm_(1-n)][Br]]₃、[Cs][Pb_nLa_(1-n)][Br]₃、[Cs][Pb_nCe_(1-n)][Br]₃、[Cs][Pb_nPr_(1-n)][Br]₃、[Cs][Pb_nNd_(1-n)][Br]₃、[Cs][Pb_nPm_(1-n)][Br]₃、[Cs][Pb_nGd_(1-n)][Br]₃、[Cs][Pb_nTb_(1-n)][Br]₃、[Cs][Pb_nHo_(1-n)][Br]₃、[Cs][Pb_nEr_(1-n)][Br]₃、[Rb][Pb][Br]₃、[Rb][Pb_nSr_(1-n)][Br]₃、[Rb][Pb_nMg_(1-n)][Br]₃、[Rb][Pb_nCa_(1-n)][Br]₃、[Rb][Pb_nBa_(1-n)][Br]₃、[Rb][Pb_nEu_(1-n)][Br]₃、[Rb][Pb_nYb_(1-n)][Br]₃、[Rb][Pb_nTm_(1-n)][Br]₃、[Rb][Pb_nLa_(1-n)][Br]₃、[Rb][Pb_nCe_(1-n)][Br]₃、[Rb][Pb_nPr_(1-n)][Br]₃、[Rb][Pb_nNd_(1-n)][Br]₃、[Rb][Pb_nPm_(1-n)][Br]₃、[Rb][Pb_nGd_(1-n)][Br]₃、[Rb][Pb_nTb_(1-n)][Br]₃、[Rb][Pb_nHo_(1-n)][Br]₃、[Rb][Pb_nEr_(1-n)][Br]₃、[K][Pb][Br]₃、[K][Pb_nSr_(1-n)][Br]₃、[K][Pb_nMg_(1-n)][Br]₃、[K][Pb_nCa_(1-n)][Br]₃、[K][Pb_nBa_(1-n)][Br]₃、[K][Pb_nEu_(1-n)][Br]₃、[K][Pb_nYb_(1-n)][Br]₃、[K][Pb_nTm_(1-n)][Br]₃、[K][Pb_nLa_(1-n)][Br]₃、[K][Pb_nCe_(1-n)][Br]₃、[K][Pb_nPr_(1-n)][Br]₃、[K][Pb_nNd_(1-n)][Br]₃、[K][Pb_nPm_(1-n)][Br]₃、[K][Pb_nGd_(1-n)][Br]₃、[K][Pb_nTb_(1-n)][Br]₃、[K][Pb_nHo_(1-n)][Br]₃、[K][Pb_nEr_(1-n)][Br]₃、[CH₃NH₃][Tm][Br]₃、[CH₃NH₃][Tm_nSr_(1-n)][Br]₃、[CH₃NH₃][Tm_nMg_(1-n)][Br]₃、[CH₃NH₃][Tm_nCa_(1-n)][Br]₃、[CH₃NH₃][Tm_nBa_(1-n)][Br]₃、[CH₃NH₃][Tm_nEu_(1-n)][Br]₃、[CH₃NH₃][Tm_nYb_(1-n)][Br]₃、[CH₃NH₃][Tm_nLa_(1-n)][Br]₃、[CH₃NH₃][Tm_nCe_(1-n)][Br]₃、[CH₃NH₃][Tm_nPr_(1-n)][Br]₃、[CH₃NH₃][Tm_nNd_(1-n)][Br]₃、[CH₃NH₃][Tm_nPm_(1-n)][Br]₃、[CH₃NH₃][Tm_nGd_(1-n)][Br]₃、[CH₃NH₃][Tm_nTb_(1-n)][Br]₃、[CH₃NH₃][Tm_nHo_(1-n)][Br]₃、[CH₃NH₃][Tm_nEr_(1-n)][Br]₃、[Cs][Tm][Br]₃、[Cs][Tm_nSr_(1-n)][Br]₃、[Cs][Tm_nMg_(1-n)][Br]₃、[Cs][Tm_nCa_(1-n)][Br]₃、[Cs][Tm_nBa_(1-n)][Br]₃、[Cs][Tm_nEu_(1-n)][Br]₃、[Cs][Tm_nYb_(1-n)][Br]₃、[Cs][Tm_nLa_(1-n)][Br]₃、[Cs][Tm_nCe_(1-n)][Br]₃、[Cs][Tm_nPr_(1-n)][Br]₃、[Cs][Tm_nNd_(1-n)][Br]₃、[Cs][Tm_nPm_(1-n)][Br]₃、[Cs][Tm_nGd_(1-n)][Br]₃、[Cs][Tm_nTb_(1-n)][Br]₃、[Cs][Tm_nHo_(1-n)][Br]₃、[Cs][Tm_nEr_(1-n)][Br]₃Or any combination thereof.

In some exemplary embodiments of the present application, n may be a real number satisfying the condition 0< n < 1. For example, n may be a real number that satisfies the condition 0< n ≦ 0.6. In some exemplary embodiments of the present application, n may be a real number satisfying the condition 0.001 ≦ n ≦ 0.6. In some exemplary embodiments of the present application, n may be a real number satisfying the condition 0.05 ≦ n ≦ 0.4. However, the exemplary embodiments of the present application are not limited thereto.

In some exemplary embodiments of the present application, X in chemical formula 1 may be iodide ion (I-). However, the exemplary embodiments of the present application are not limited thereto.

In some exemplary embodiments of the present application, the perovskite compound of chemical formula 1 may be selected from [ CH [ ]₃NH₃][Pb][Cl]₃、[CH₃NH₃][Pb_nSr_(1-n)][Cl]₃、[CH₃NH₃][Pb_nMg_(1-n)][Cl]₃、[CH₃NH₃][Pb_nCa_(1-n)][Cl]₃、[CH₃NH₃][Pb_nBa_(1-n)][Cl]₃、[CH₃NH₃][Pb_nEu_(1-n)][Cl]₃、[CH₃NH₃][Pb_nYb_(1-n)][Cl]₃、[CH₃NH₃][Pb_nTm_(1-n)][Cl]₃、[CH₃NH₃][Pb_nLa_(1-n)][Cl]₃、[CH₃NH₃][Pb_nCe_(1-n)][Cl]₃、[CH₃NH₃][Pb_nPr_(1-n)][Cl]₃、[CH₃NH₃][Pb_nNd_(1-n)][Cl]₃、[CH₃NH₃][Pb_nPm_(1-n)][Cl]₃、[CH₃NH₃][PbnGd_(1-n)][Cl]₃、[CH₃NH₃][Pb_nTb_(1-n)][Cl]₃、[CH₃NH₃][Pb_nHo_(1-n)][Cl]₃、[CH₃NH₃][Pb_nEr_(1-n)][Cl]₃、[Cs][Pb][Cl]₃、[Cs][Pb_nSr_(1-n)][Cl]₃、[Cs][Pb_nMg_(1-n)][Cl]₃、[Cs][Pb_nCa_(1-n)][Cl]₃、[Cs][Pb_nBa_(1-n)][Cl]₃、[Cs][Pb_nEu_(1-n)][Cl]₃、[Cs][Pb_nYb_(1-n)][Cl]₃、[Cs][Pb_nTm_(1-n)][Cl]]₃、[Cs][Pb_nLa_(1-n)][Cl]₃、[Cs][Pb_nCe_(1-n)][Cl]₃、[Cs][Pb_nPr_(1-n)][Cl]₃、[Cs][Pb_nNd_(1-n)][Cl]₃、[Cs][Pb_nPm_(1-n)][Cl]₃、[Cs][Pb_nGd_(1-n)][Cl]₃、[Cs][Pb_nTb_(1-n)][Cl]₃、[Cs][Pb_nHo_(1-n)][Cl]₃、[Cs][Pb_nEr_(1-n)][Cl]₃、[Rb][Pb][Cl]₃、[Rb][Pb_nSr_(1-n)][Cl]₃、[Rb][Pb_nMg_(1-n)][Cl]₃、[Rb][Pb_nCa_(1-n)][Cl]₃、[Rb][Pb_nBa_(1-n)][Cl]₃、[Rb][Pb_nEu_(1-n)][Cl]₃、[Rb][Pb_nYb_(1-n)][Cl]₃、[Rb][Pb_nTm_(1-n)][Cl]₃、[Rb][Pb_nLa_(1-n)][Cl]₃、[Rb][Pb_nCe_(1-n)][Cl]₃、[Rb][Pb_nPr_(1-n)][Cl]₃、[Rb][Pb_nNd_(1-n)][Cl]₃、[Rb][Pb_nPm_(1-n)][Cl]₃、[Rb][Pb_nGd_(1-n)][Cl]₃、[Rb][Pb_nTb_(1-n)][Cl]₃、[Rb][Pb_nHo_(1-n)][Cl]₃、[Rb][Pb_nEr_(1-n)][Cl]₃、[K][Pb][Cl]₃、[K][Pb_nSr_(1-n)][Cl]₃、[K][Pb_nMg_(1-n)][Cl]₃、[K][Pb_nCa_(1-n)][Cl]₃、[K][Pb_nBa_(1-n)][Cl]₃、[K][Pb_nEu_(1-n)][Cl]₃、[K][Pb_nYb_(1-n)][Cl]₃、[K][Pb_nTm_(1-n)][Cl]₃、[K][Pb_nLa_(1-n)][Cl]₃、[K][Pb_nCe_(1-n)][Cl]₃、[K][Pb_nPr_(1-n)][Cl]₃、[K][Pb_nNd_(1-n)][Cl]₃、[K][Pb_nPm_(1-n)][Cl]₃、[K][Pb_nGd_(1-n)][Cl]₃、[K][Pb_nTb_(1-n)][Cl]₃、[K][Pb_nHo_(1-n)][Cl]₃、[K][Pb_nEr_(1-n)][Cl]₃、[CH₃NH₃][Tm][Cl]₃、[CH₃NH₃][Tm_nSr_(1-n)][Cl]₃、[CH₃NH₃][Tm_nMg_(1-n)][Cl]₃、[CH₃NH₃][Tm_nCa_(1-n)][Cl]₃、[CH₃NH₃][Tm_nBa_(1-n)][Cl]₃、[CH₃NH₃][Tm_nEu_(1-n)][Cl]₃、[CH₃NH₃][Tm_nYb_(1-n)][Cl]₃、[CH₃NH₃][Tm_nLa_(1-n)][Cl]₃、[CH₃NH₃][Tm_nCe_(1-n)][Cl]₃、[CH₃NH₃][Tm_nPr_(1-n)][Cl]₃、[CH₃NH₃][Tm_nNd_(1-n)][Cl]₃、[CH₃NH₃][Tm_nPm_(1-n)][Cl]₃、[CH₃NH₃][Tm_nGd_(1-n)][Cl]₃、[CH₃NH₃][Tm_nTb_(1-n)][Cl]₃、[CH₃NH₃][Tm_nHo_(1-n)][Cl]₃、[CH₃NH₃][Tm_nEr_(1-n)][Cl]₃、[Cs][Tm][Cl]₃、[Cs][Tm_nSr_(1-n)][Cl]₃、[Cs][Tm_nMg_(1-n)][Cl]₃、[Cs][Tm_nCa_(1-n)][Cl]₃、[Cs][Tm_nBa_(1-n)][Cl]₃、[Cs][Tm_nEu_(1-n)][Cl]₃、[Cs][Tm_nYb_(1-n)][Cl]₃、[Cs][Tm_nLa_(1-n)][Cl]₃、[Cs][Tm_nCe_(1-n)][Cl]₃、[Cs][Tm_nPr_(1-n)][Cl]₃、[Cs][Tm_nNd_(1-n)][Cl]₃、[Cs][Tm_nPm_(1-n)][Cl]₃、[Cs][Tm_nGd_(1-n)][Cl]₃、[Cs][Tm_nTb_(1-n)][Cl]₃、[Cs][Tm_nHo_(1-n)][Cl]₃、[Cs][Tm_nEr_(1-n)][Cl]₃Or any combination thereof.

In some exemplary embodiments of the present application, n may be a real number satisfying the condition 0< n < 1. For example, n may be a real number that satisfies the condition 0< n ≦ 0.6. In some exemplary embodiments of the present application, n may be a real number satisfying the condition 0.001 ≦ n ≦ 0.6. In some exemplary embodiments of the present application, n may be a real number satisfying the condition 0.05 ≦ n ≦ 0.4. However, the exemplary embodiments of the present application are not limited thereto.

In some exemplary embodiments of the present application, the polymer matrix may include, for example, a polyepoxy resin, a polysilicoxy resin, a polysilic resin, a polystyrene resin, a poly (meth) acrylate resin, or any combination thereof. However, the exemplary embodiments of the present application are not limited thereto.

In some exemplary embodiments of the present application, the perovskite quantum dots may be surrounded by, for example, at least one ligand. The ligands may increase the stability of the perovskite quantum dots and protect the perovskite quantum dots from deleterious external conditions (e.g., high temperature, high strength, external gases and/or moisture).

In some exemplary embodiments of the present application, a perovskite quantum dot-polymer composite containing quantum dots represented by chemical formula 1 may be prepared by mixing an a-containing precursor, a B-containing precursor, and a polymer matrix precursor and performing a heat treatment.

In some exemplary embodiments of the present application, a perovskite quantum dot-polymer composite containing quantum dots represented by chemical formula 1 may also be prepared by mixing an a-containing precursor, a B-containing precursor, and a polymer matrix and performing a heat treatment.

In some exemplary embodiments of the present application, the perovskite quantum dot-polymer composite containing the quantum dot represented by chemical formula 1 may also be prepared by mixing a precursor containing a and a precursor containing B and then performing a heat treatment to prepare the perovskite quantum dot, and then mixing the perovskite quantum dot with a polymer matrix or a polymer matrix precursor.

In the a-containing precursor and the B-containing precursor, a and B may be the same as those defined in chemical formula 1. For example, A of the A-containing precursor can be selected from halides of A (e.g., (A) (X)₁) And B of the B-containing precursor may be selected from halides of B (e.g., (B) (X)₂)(X₃)). In the presence of a catalyst consisting of (A) (X)₁) And (B) (X)₂)(X₃) In the halides represented, A and B may be the same as those defined herein, and X₁To X₃Can be independently selected from F-, Cl-, Br-or I-.

The heat treatment for forming the perovskite quantum dots may be performed at a temperature ranging from, for example, about 50 ℃ to about 800 ℃ for about 1 minute to about 48 hours. However, the exemplary embodiments of the present application are not limited thereto.

In some exemplary embodiments of the present application, a light emitting device includes a light source and a light conversion layer comprising the above perovskite quantum dot-polymer composite; the perovskite quantum dot-polymer composite absorbs at least a portion of the light emitted by the light source and emits light having a wavelength range different from that of the absorbed light.

The light source is not limited to a particular type of light source and thus the light source may be any type of light source. For example, the light source may be a light source that can emit light by applying an external voltage. In some exemplary embodiments of the present application, the light source may be a fluorescent lamp, a Light Emitting Diode (LED), an organic LED, a quantum dot light emitting diode (QLED), or any combination thereof. For example, the fluorescent lamp may include a Cold Cathode Fluorescent Lamp (CCFL) and/or an External Electrode Fluorescent Lamp (EEFL). However, the exemplary embodiments of the present application are not limited thereto.

The light source may emit blue light (e.g., light having a wavelength range of about 420nm to about 490 nm) or UV light (e.g., light having a wavelength range of about 300nm to about 420 nm). For example, the light source may be a blue light emitting diode emitting blue light or a UV light emitting diode emitting UV light. However, the exemplary embodiments of the present application are not limited thereto.

In some exemplary embodiments of the present application, a light source of a light emitting device may emit blue light, and the perovskite quantum dot-polymer composite may absorb the blue light emitted from the light source and emit light having a wavelength range different from that of the blue light.

In some exemplary embodiments of the present application, the light conversion layer may be a thin film layer. The thin film layer may be about 0.1 to 100 microns thick and include a yellow, green, or red emitting perovskite compound.

A barrier film on at least one surface of the light conversion layer to prevent contact between the light conversion layer and oxygen or moisture. For example, the blocking film may be on a light incident surface of the light conversion layer (e.g., a surface that receives light emitted by the light source) and/or on a light emitting surface of the light conversion layer (e.g., a surface through which light is emitted from the light conversion layer).

In some exemplary embodiments of the present application, the blocking film may surround the entire light conversion layer. The barrier film may comprise, for example, a polyester, a polycarbonate, a polyolefin, a Cyclic Olefin Copolymer (COC), a polyimide, or any combination thereof.

The barrier film may further include an inorganic coating film in the form of a monolayer film or a multilayer film. The inorganic material in the inorganic coating film may include an inorganic oxide, for example, silica, alumina, titania, zirconia, or any combination thereof. The inorganic coating layer may inhibit oxygen or moisture permeation, thereby increasing the barrier film's ability to block oxygen and/or moisture.

The light conversion layer may be arranged to receive at least a portion of the light emitted by the light source. For example, the light conversion layer may be arranged to directly receive at least a portion of the light emitted by the light source without an intermediate layer between the light source and the light conversion layer. However, the exemplary embodiments of the present application are not limited thereto. For example, the light emitting device may comprise further elements between the light source and the light conversion layer. For example, the light source and the light conversion layer may be in direct contact with each other. Thus, light emitted by the light source may be substantially immediately incident into the light conversion layer.

In some exemplary embodiments of the present application, the light source and the light conversion layer may be separated from each other. For example, the light source and the light conversion layer may be spaced apart from each other with additional elements between the light source and the light conversion layer. The further element may be between the light source and the light conversion layer, and the light source and the light conversion layer may face each other. The further element may be on a propagation path of light emitted by the light source propagating towards the light conversion layer.

Fig. 1 and 2 illustrate schematic views of structures of light emitting devices according to exemplary embodiments of the present application.

Referring to fig. 1 and 2, in the light emitting devices 10 and 20, the light sources 121, 122, 123, and 220 and the light conversion layers 110 and 210 may be arranged such that light emitted by the light sources 121, 122, 123, and 220 may be incident on the light conversion layers 110 and 210.

In the light emitting apparatus 10, the light sources 121, 122, and 123 may be disposed under the light conversion layer 110, and thus light emitted upward from the light sources 121, 122, and 123 may be incident on the light conversion layer 110.

In the light emitting apparatus 20, the light source 220 may be disposed at one side of the light conversion layer 210. The light emitting apparatus 20 may include additional elements, for example, a light guide plate 230. The light guide plate 230 may increase the efficiency of light emitted from the light source 220 to the light conversion layer 210.

The light emitting apparatus according to the exemplary embodiments of the present application may be used for various purposes. For example, the light emitting apparatus according to some exemplary embodiments of the present application may be used as a backlight unit (BLU) of a liquid crystal display device, indoor or outdoor lighting, stage lighting, or decorative lighting. However, the exemplary embodiments of the present application are not limited thereto.

Perovskite quantum dot-polymer composites according to some exemplary embodiments of the present application will be described in more detail below with reference to the following examples; however, the exemplary embodiments of the present application are not limited thereto.

₃[Cs][Pb][Br]The preparation process of the quantum dot is as follows：

0.407g of Cs was weighed₂CO₃Measuring 15mL of octadecene and 1.25mL of oleic acid, introducing nitrogen, degassing and protecting, heating to 120 ℃, keeping for 1h to obtain a transparent Cs precursor solution, and cooling for later use.

In a 50mL three-necked flask, 5mL of 1-octadecene and 0.069g of PbBr were taken₂Introducing nitrogen gas at 120 ℃ for degassing and stirring for 1 h; then, 0.5mL of oleylamine and 0.5mL of oleic acid were added thereto, and the mixture was heated to 150 ℃ and stirred for 1 hour. And then 0.6mL of Cs precursor solution is quickly injected into the solution, the heating is stopped after the reaction is carried out for 5s, the solution is placed into ice water for cooling after 10s, a yellow-green condensed colloidal substance is obtained, and the solution is taken out and naturally heated to the room temperature.

Centrifuging the obtained yellow-green liquid at 1000r/min for 5min, collecting supernatant, centrifuging at 12000r/min for 10min, collecting bottom precipitate, adding 1.5mL of toluene into the precipitate, and dispersing with ultrasonic wave to obtain [ Cs [][Pb][Br]₃And putting the toluene solution of the quantum dots into a glass bottle, and sealing and storing at room temperature.

The obtained [ Cs ]][Pb][Br]₃The quantum dot emits 518nm peak wavelength and 18nm half-peak width under the excitation of 447nm light.

_{3 3 3}[CHNH][Pb][Br]The preparation process of the quantum dot is as follows：

Adding 2mL of octadecene into a flask, putting the flask into an oil bath pot, heating and keeping the temperature at 80 ℃, and adding 0.3mmol of oleic acid; weighing 0.06mmol octyl ammonium bromide and 0.04mmol methyl ammonium bromide and adding into a beaker; adding 100 microliters of DMF into the beaker, and after the solid in the beaker is completely dissolved, dissolving 0.1m of DMF dissolved in 100 microliters in advanceAdding mol lead bromide into a flask, and reacting for a period of time; then adding 4mL of acetone into the flask to obtain a precipitate, and centrifuging at the rotating speed of 7000r/min for 10min for 3 times; adding 1.5mL of toluene into the precipitate, and dispersing by ultrasonic wave to obtain [ CH₃NH₃][Pb][Br]₃And putting the toluene solution of the quantum dots into a glass bottle, and sealing and storing at room temperature.

Obtained [ CH₃NH₃][Pb][Br]₃The quantum dot emits light with a peak-peak wavelength of 525nm under the excitation of 447nm light, and the half-peak width is about 19 nm.

Example 1

Perovskite quantum dot-polymer composite: the perovskite quantum dot is CsPbBr₃The quantum dots and the polymer matrix are poly (methyl) acrylate resin.

Preparation of perovskite quantum dot-polymer complex: adding a certain amount of CsPbBr₃After the toluene solution of the quantum dots is mixed with a certain amount of (methyl) acrylate resin, the gel is homogenized and defoamed at a low rotating speed and a negative pressure. Film-forming is carried out under normal temperature and pressure to obtain the film-shaped perovskite quantum dot-polymer complex with the thickness of about 100 microns.

By varying CsPbBr₃The weight percentages C of the prepared perovskite quantum dots are respectively 0.5 wt%, 1 wt%, 2 wt%, 3 wt%, 4 wt%, 6 wt%, 8 wt%, 10 wt% and 12 wt% according to the addition amounts of the quantum dots and the (methyl) acrylate resin.

The perovskite quantum dot-polymer complex was tested for fluorescence emission peak using a PR655 photometer using an excitation wavelength of 447nm and an emission peak-to-peak wavelength as shown in table 1 below:

table 1:

example 2

Perovskite quantum dot-polymer composite: the perovskite quantum dot is [ CH₃NH₃][Pb][Br]₃The quantum dots and the polymer matrix are poly (methyl) acrylate resin.

Preparation of perovskite quantum dot-polymer complex: a certain amount of [ CH₃NH₃][Pb][Br]₃After the toluene solution of the quantum dots is mixed with a certain amount of (methyl) acrylate resin, the gel is homogenized and defoamed at a low rotating speed and a negative pressure. Film-forming is carried out under normal temperature and pressure to obtain the film-shaped perovskite quantum dot-polymer complex with the thickness of about 100 microns.

By changing [ CH₃NH₃][Pb][Br]₃The weight percentages C of the prepared perovskite quantum dots are respectively 0.5 wt%, 1 wt%, 2 wt%, 3 wt%, 4 wt%, 6 wt%, 8 wt%, 10 wt% and 12 wt% according to the addition amounts of the quantum dots and the (methyl) acrylate resin.

The perovskite quantum dot-polymer complex was tested for fluorescence emission peak using a PR655 photometer using an excitation wavelength of 447nm and an emission peak-to-peak wavelength as shown in table 2 below:

table 2:

from the results in tables 1 and 2, it was found that the perovskite quantum dot-polymer composite exhibits a good positive correlation between the peak wavelength λ of the emission peak and the weight percentage C of the perovskite quantum dot. By changing the value of the weight percentage C, a perovskite quantum dot-polymer composite body with a preset wavelength can be obtained, so that the perovskite quantum dot-polymer composite body can be particularly conveniently applied to a backlight unit (BLU) of a liquid crystal display device, indoor or outdoor lighting, stage lighting or decorative lighting.

Although the present disclosure has been described and illustrated in greater detail by the inventors, it should be understood that modifications and/or alterations to the above-described embodiments, or equivalent substitutions, will be apparent to those skilled in the art without departing from the spirit of the disclosure, and that no limitations to the present disclosure are intended or should be inferred therefrom.

Claims (10)

1. A perovskite quantum dot-polymer composite comprising perovskite quantum dots and a polymer matrix, the perovskite quantum dots being dispersed in the polymer matrix;

in the perovskite quantum dot-polymer composite, the weight percentage of the perovskite quantum dots is marked as C;

the peak wavelength of the emission peak of the perovskite quantum dot-polymer complex under the excitation of blue light is recorded as lambda;

when C is 2 wt% or more and 5 wt% or less, lambda is positively correlated with C.

2. The perovskite quantum dot-polymer composite according to claim 1, wherein λ is in positive correlation with C in the case where C is 1 wt% or more and 10 wt% or less.

3. The perovskite quantum dot-polymer composite according to claim 1, wherein λ is in positive correlation with C in the case where C is 0.5 wt% or more and 12 wt% or less.

4. The perovskite quantum dot-polymer composite according to any one of claims 1 to 3, wherein the perovskite quantum dot is a compound represented by chemical formula 1:

chemical formula 1: [ A ]][B][X]₃Wherein, in chemical formula 1,

a is at least one monovalent organic cation, at least one monovalent inorganic cation, or any combination thereof,

b is at least one divalent inorganic cation, and

x is at least one monovalent anion.

5. The perovskite quantum dot-polymer composite of claim 4, wherein A is (R)₁R₂R₃C)⁺、(R₁R₂R₃R₄N)⁺、(R₁R₂R₃R₄P)⁺、(R₁R₂R₃R₄As)⁺、(R₁R₂R₃R₄Sb)⁺、(R₁R₂N＝C(R₃)-NR₄R₅)⁺Substituted or unsubstituted cycloheptatriene, substituted or unsubstituted monovalent cation of nitrogen-containing five-membered ring, substituted or unsubstituted monovalent cation of nitrogen-containing six-membered ring, Li⁺、Na⁺、K⁺、Rb⁺、Cs⁺、Fr⁺Or any combination thereof,

R₁to R₅Each independently selected from hydrogen, deuterium, -F, -Cl, -Br, -I, hydroxy, substituted or unsubstituted C₁-C₆₀Alkyl, substituted or unsubstituted C_2-C60Alkenyl, substituted or unsubstituted C₂-C₆₀Alkynyl, substituted or unsubstituted C₁-C₆₀Alkoxy, substituted or unsubstituted C₆-C₆₀Aryl or-N (Q)₁)(Q₂)，

At least one substituent of the substituted cycloheptatriene, the monovalent cation of the substituted nitrogen-containing five-membered ring, and the monovalent cation of the substituted nitrogen-containing six-membered ring is selected from deuterium, -F, -Cl, -Br, -I, hydroxyl, substituted or unsubstituted C₁-C₆₀Alkyl, substituted or unsubstituted C₂-C₆₀Alkenyl, substituted or unsubstituted C₂-C₆₀Alkynyl, substituted or unsubstituted C₁-C₆₀Alkoxy, substituted or unsubstituted C₆-C₆₀Aryl or-N (Q)₃)(Q₄) And is and

Q₁to Q₄Each independently selected from hydrogen, deuterium, hydroxy, C₁-C₆₀Alkyl radical, C₂-C₆₀Alkenyl radical, C₂-C₆₀Alkynyl, C₁-C₆₀Alkoxy or C₆-C₆₀And (4) an aryl group.

6. The perovskite quantum dot-polymer composite of claim 5, wherein A is (NH)₄)⁺、(PH₄)⁺、(AsH₄)⁺、(SbH₄)⁺、(NF₄)⁺、(PF₄)⁺、(NCl₄)⁺、(PCl₄)⁺、(CH₃NH₃)⁺、(CH₃PH₃)⁺、(CH₃AsH₃)⁺、(CH₃SbH₃)⁺、((CH₃)₂NH₂)⁺、((CH₃)₂PH₂)⁺、((CH₃)₂AsH₂)⁺、((CH₃)₂SbH₂)⁺、((CH₃)₃NH)⁺、((CH₃)₃PH)⁺、((CH₃)₃AsH)⁺、((CH₃)₃SbH)⁺、((CH₃CH₂)NH₃)⁺、((CH₃CH₂)PH₃)⁺、((CH₃CH₂)AsH₃)⁺、((CH₃CH₂)SbH₃)⁺、(CH₂N₂H₄)⁺、(C₇H₇)⁺、(NH₃OH)⁺、(NH₃NH₂)⁺、((CH₂)₃NH₂)⁺、(CH(NH₂)₂)⁺、(C₃N₂H₅)⁺、(NC₄H₈)⁺、((NH₂)₃C)⁺、K⁺、Rb⁺、Cs⁺Or any combination thereof.

7. The perovskite quantum dot-polymer composite of claim 4, wherein B is a divalent cation of a rare earth metal, a divalent cation of an alkaline earth metal, a divalent cation of a transition metal, a divalent cation of a post-transition metal, or any combination thereof.

8. The perovskite quantum dot-polymer composite of claim 7, wherein B is La²⁺、Ce²⁺、Pr^{2 +}、Nd²⁺、Pm²⁺、Eu²⁺、Gd²⁺、Tb²⁺、Ho²⁺、Er²⁺、Tm²⁺、Yb²⁺、Lu²⁺、Be²⁺、Mg²⁺、Ca²⁺、Sr²⁺、Ba²⁺、Ra²⁺、Pb²⁺、Sn²⁺Or any combination thereof.

9. The perovskite quantum dot-polymer composite of claim 4, wherein X is at least one halide anion.

10. A light emitting device comprising, a light source and a light conversion layer comprising the perovskite quantum dot-polymer composite of any one of claims 1 to 9;

the perovskite quantum dot-polymer composite absorbs at least a portion of light emitted by the light source and emits light having a wavelength range different from that of the absorbed light.

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