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CN111376558B - Quantum dot color film - Google Patents

Quantum dot color film Download PDF

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Publication number
CN111376558B
CN111376558B CN201811641448.6A CN201811641448A CN111376558B CN 111376558 B CN111376558 B CN 111376558B CN 201811641448 A CN201811641448 A CN 201811641448A CN 111376558 B CN111376558 B CN 111376558B
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quantum dot
color film
quantum
dot color
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CN111376558A (en
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李鑫
李慧州
宋研君
徐飞阳
王允军
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Suzhou Xingshuo Nanotech Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/06Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/18Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00Layered products comprising a layer of synthetic resin
    • B32B27/30Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B82NANOTECHNOLOGY
    • B82YSPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y20/00Nanooptics, e.g. quantum optics or photonic crystals
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B82NANOTECHNOLOGY
    • B82YSPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y30/00Nanotechnology for materials or surface science, e.g. nanocomposites
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B82NANOTECHNOLOGY
    • B82YSPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y40/00Manufacture or treatment of nanostructures
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    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/02Use of particular materials as binders, particle coatings or suspension media therefor
    • C09K11/025Use of particular materials as binders, particle coatings or suspension media therefor non-luminescent particle coatings or suspension media
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09KMATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/88Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing selenium, tellurium or unspecified chalcogen elements
    • C09K11/881Chalcogenides
    • C09K11/883Chalcogenides with zinc or cadmium

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Abstract

The invention discloses a quantum dot color film, which comprises a red sub-pixel, wherein the red sub-pixel comprises: a polymer; quantum dots dispersed in the polymer; the quantum dots comprise CdZnSe cores, ZnSeS layers and CdZnS layers, the ZnSeS layers and the CdZnS layers are sequentially distributed on the peripheries of the CdZnSe cores, and the emission peak wavelength of the quantum dots is 610 nanometers to 660 nanometers. The quantum dot color film adopts the quantum dots with the three-layer structure, and the quantum dots have higher fluorescence quantum efficiency, so that the photoinduced quantum efficiency of the quantum dot color film is promoted.

Description

Quantum dot color film
Technical Field
The application belongs to the field of quantum dots, and particularly relates to a quantum dot color film.
Background
Due to its excellent optical properties, quantum dots have been widely used in the display field, such as quantum dot color films.
However, the current quantum dot color film has low photo-induced quantum efficiency.
Disclosure of Invention
To solve the technical problem, the application provides a quantum dot color film for improving the photoinduced quantum efficiency.
A quantum dot color film comprises a red sub-pixel, wherein the red sub-pixel comprises: a polymer; quantum dots dispersed in the polymer; the quantum dots comprise CdZnSe cores, ZnSeS layers and CdZnS layers, the ZnSeS layers and the CdZnS layers are sequentially distributed on the peripheries of the CdZnSe cores, and the emission peak wavelength of the quantum dots is 610 nanometers to 660 nanometers.
The quantum dot color film adopts the quantum dots with the three-layer structure, and the quantum dots have higher fluorescence quantum efficiency, so that the photoinduced quantum efficiency of the quantum dot color film is promoted.
In one embodiment, the quantum dots have a particle size in the range of 10 nm to 20 nm.
The particle size referred to herein does not include the ligand length of the quantum dot, that is, the particle size of the quantum dot CdZnSe/ZnSeS/CdZnS trilayer structure ranges from 10 nm to 20 nm.
In one embodiment, the CdZnSe core has a particle size in a range of 5 nm to 12 nm, the ZnSeS layer has a thickness in a range of 1 nm to 4 nm, and the CdZnS layer has a thickness in a range of 1 nm to 3 nm.
The inventor finds that when the thickness range of the three layers of the quantum dot is in the value, the fluorescence quantum efficiency of the quantum dot is favorably improved, and therefore the photoinduced quantum efficiency of a quantum dot color film is further improved.
In one embodiment, the quantum dots have a fluorescence quantum efficiency of greater than 50%.
In one embodiment, the mass ratio between the quantum dots and the polymer is 1: 1 to 3.
In one embodiment, the quantum dot comprises a ligand, the ligand being
Figure BDA0001931188600000021
w, x, y, z are each independently an integer selected from 0 to 30;
at least one of R1, R2, R3, R4 is a mercapto group-containing group;
r, R are each independently selected from a mercapto group-containing group, a hydrogen atom, a halogen atom, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a C-C ester group, a C-C alkyl group, a C-C alkenyl group, a C-C alkynyl group, a C-C alkoxy group, a C-C cycloalkyl group, a C-C heterocycloalkyl group, a C-C cycloalkenyl group, a C-C heterocycloalkenyl group, a C-C aryl group, a C-C heteroaryl group, a C-C aryloxy group, a C-C arylthio group, or a C-C ester group, a C-C alkyl group, a C-C alkenyl group, a C-C alkynyl group, a C-C alkoxy group, a C-C cycloalkyl group, a C-C heterocycloalkyl group, a C-C cycloalkenyl group, a C-C heterocycloalkenyl group, a C-C aryl group, a C-C heteroaryl group, a C-C aryloxy group, a C-C arylthio group, or a C-C arylthio group, wherein at least one of the following groups are substituted: a halogen atom, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxyl group or a salt thereof, a sulfonic acid group or a salt thereof.
By adopting the ligand, the quantum dots can be dispersed in the polymer more stably, so that the quantum dot color film is more stable.
In one embodiment, the ligand mass content of the quantum dot is 1% to 60%.
In one embodiment, the ligand is selected from at least one of compounds 1 to 4,
Figure BDA0001931188600000022
in one embodiment, the thickness of the red sub-pixel ranges from 0.5 to 10 microns.
In one embodiment, the light diffusion particles are selected from titanium dioxide, barium sulfate, magnesium oxide, silicon dioxide or aluminum oxide.
The light diffusion particles are added into the quantum dot color film, so that the photoinduced quantum efficiency of the quantum dot color film can be further improved.
Drawings
Fig. 1 is a schematic structural diagram of a quantum dot film in the first embodiment.
In the drawings like parts are provided with the same reference numerals. The figures show embodiments of the application only schematically.
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.
The first embodiment is as follows:
referring to fig. 1, the quantum dot color film 1 includes a substrate 11 and a red subpixel 13, wherein the substrate 11 carries the red subpixel 13. The red sub-pixel 13 has a thickness of 5 microns.
The red sub-pixel 13 comprises acrylic resin polymer, CdZnSe/ZnSeS/CdZnS quantum dots and titanium dioxide particles. The mass ratio of the acrylic resin polymer to the quantum dots to the titanium dioxide particles is 4: 2: 1.
the emission peak wavelength of the quantum dot is 630 nanometers, the average particle size of the quantum dot is 15 nanometers, the average particle size of the CdZnSe core is 7 nanometers, the average thickness of the ZnSeS layer is 2 nanometers, and the thickness of the CdZnS layer is 2 nanometers.
The ligand of the quantum dot comprises
Figure BDA0001931188600000031
The mass content of the ligand is 40 percent.
The fluorescence quantum efficiency of the quantum dots was tested to be 97% using an integrating sphere.
Example two:
the quantum dot color film disclosed by the embodiment comprises a substrate and a red sub-pixel, wherein the substrate carries the red sub-pixel. The red sub-pixel has a thickness of 8 microns.
The red sub-pixel comprises acrylic resin polymer, CdZnSe/ZnSeS/CdZnS quantum dots and silica particles. The mass ratio of the acrylic resin polymer to the quantum dots to the titanium dioxide particles is 6: 2: 1.5.
the emission peak wavelength of the quantum dot is 612 nanometers, the average particle size of the quantum dot is 12 nanometers, the average particle size of the CdZnSe core is 5 nanometers, the average thickness of the ZnSeS layer is 2 nanometers, and the thickness of the CdZnS layer is 1.5 nanometers.
The ligand of the quantum dot comprises
Figure BDA0001931188600000041
The ligand content was 20%.
The quantum dot was tested for a fluorescence quantum efficiency of 80% using an integrating sphere.
Example three:
the quantum dot color film disclosed by the embodiment comprises a substrate and a red sub-pixel, wherein the substrate carries the red sub-pixel. The red sub-pixel has a thickness of 2 microns.
The red sub-pixel comprises acrylic resin polymer, CdZnSe/ZnSeS/CdZnS quantum dots and titanium dioxide particles. The mass ratio of the acrylic resin polymer to the quantum dots to the titanium dioxide particles is 3: 3: 1.
the emission peak wavelength of the quantum dot is 656 nm, the average particle size of the quantum dot is 19 nm, the average particle size of the CdZnSe core is 11 nm, the average thickness of the ZnSeS layer is 3 nm, and the thickness of the CdZnS layer is 1 nm.
The ligand of the quantum dot comprises
Figure BDA0001931188600000042
The ligand content was 55%.
The fluorescence quantum efficiency of the quantum dots was tested to be 85% using an integrating sphere.
Example four:
the quantum dot color film disclosed by the embodiment comprises a substrate and a red sub-pixel, wherein the substrate carries the red sub-pixel. The red sub-pixel has a thickness of 10 microns.
The red sub-pixel comprises an epoxy resin polymer, CdZnSe/ZnSeS/CdZnS quantum dots and titanium dioxide particles. The mass ratio of the epoxy resin polymer to the quantum dots to the titanium dioxide particles is 3: 2: 1.
the emission peak wavelength of the quantum dot is 625 nanometers, the average particle size of the quantum dot is 14 nanometers, the average particle size of the CdZnSe core is 6 nanometers, the average thickness of the ZnSeS layer is 3 nanometers, and the thickness of the CdZnS layer is 1 nanometer.
The ligand of the quantum dot comprises
Figure BDA0001931188600000051
Wherein w is 4, x is 5, y is 5, z is 6,
the ligand content was 10%.
The fluorescence quantum efficiency of the quantum dots was tested to be 87% using an integrating sphere.
Comparative example:
the quantum dot color film disclosed by this comparative example includes a substrate carrying red subpixels and red subpixels. The red sub-pixel has a thickness of 5 microns.
The red sub-pixel comprises acrylic resin polymer and CdZnSeS/ZnS quantum dots. The mass ratio of the acrylic resin polymer to the quantum dots is 3: 1.
the emission peak wavelength of the quantum dot is 630 nanometers. The fluorescence quantum efficiency is 70%.
The quantum dot color films of examples one to four and comparative example were now tested for photo-induced quantum efficiency. The method comprises the following steps of irradiating a quantum dot color film by using 450nm blue light with the intensity of 50 milliwatts per square centimeter as a light source, and testing the photoinduced quantum efficiency of the quantum dot color film by using an integrating sphere system, wherein the specific test results are shown in the following table:
Figure BDA0001931188600000052
as can be seen from the above table, the photo-induced quantum efficiency of the quantum dot color film disclosed in the embodiment of the present invention is significantly higher than that of the quantum dot color film of the comparative example. Therefore, compared with the prior art, the quantum dot color film disclosed by the invention has the advantage that the photoinduced quantum efficiency is obviously improved.
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 (9)

1. A quantum dot color film comprising a red subpixel, the red subpixel comprising:
a polymer;
quantum dots dispersed in the polymer; wherein,
the quantum dots comprise CdZnSe cores, ZnSeS layers and CdZnS layers, the ZnSeS layers and the CdZnS layers are sequentially distributed on the periphery of the CdZnSe cores, the emission peak wavelength of the quantum dots is 610 to 660 nanometers,
wherein the quantum dot comprises a ligand which is
Figure FDA0003386108360000011
w, x, y, z are each independently an integer selected from 0 to 30;
at least one of R1, R2, R3, R4 is a mercapto group-containing group;
r, R are each independently selected from a mercapto group-containing group, a hydrogen atom, a halogen atom, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a C-C ester group, a C-C alkyl group, a C-C alkenyl group, a C-C alkynyl group, a C-C alkoxy group, a C-C cycloalkyl group, a C-C heterocycloalkyl group, a C-C cycloalkenyl group, a C-C heterocycloalkenyl group, a C-C aryl group, a C-C heteroaryl group, a C-C aryloxy group, a C-C arylthio group, or a C-C ester group, a C-C alkyl group, a C-C alkenyl group, a C-C alkynyl group, a C-C alkoxy group, a C-C cycloalkyl group, a C-C heterocycloalkyl group, a C-C cycloalkenyl group, a C-C heterocycloalkenyl group, a C-C aryl group, a C-C heteroaryl group, a C-C aryloxy group, a C-C arylthio group, or a C-C arylthio group, wherein at least one of the following groups are substituted: a halogen atom, a hydroxyl group, a cyano group, a nitro group, an amino group, an amidino group, a hydrazine group, a hydrazone group, a carboxyl group or a salt thereof, a sulfonic acid group or a salt thereof.
2. The quantum dot color film of claim 1, wherein the particle size range of the quantum dots is 10 nm to 20 nm.
3. The quantum dot color film of claim 1 or 2, wherein the CdZnSe core has a particle size in a range from 5 nm to 12 nm, the ZnSeS layer has a thickness in a range from 1 nm to 4 nm, and the CdZnS layer has a thickness in a range from 1 nm to 3 nm.
4. The quantum dot color film of claim 1, wherein the quantum dot fluorescence quantum efficiency is higher than 50%.
5. The quantum dot color film of claim 1, wherein the mass ratio of the quantum dots to the polymer is 1: 1 to 3.
6. The quantum dot color film of claim 1, wherein the mass content of the ligand of the quantum dot is 1% to 60%.
7. The quantum dot color film of claim 1, wherein the ligand is selected from at least one of compounds 1 to 4,
Figure FDA0003386108360000021
8. the quantum dot color film of claim 1, wherein the thickness of the red sub-pixel ranges from 0.5 to 10 microns.
9. The quantum dot color film of claim 1, further comprising light diffusing particles selected from titanium dioxide, barium sulfate, magnesium oxide, silicon dioxide, or aluminum oxide.
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CN105242442A (en) * 2015-10-08 2016-01-13 深圳市华星光电技术有限公司 Method for making quantum dot color film
CN108485647A (en) * 2018-03-21 2018-09-04 深圳扑浪创新科技有限公司 Preparation method of fluorescent quantum dot/oxide composite material, product and application thereof
CN108587628A (en) * 2018-06-07 2018-09-28 玻尔兹曼智能科技(苏州)有限公司 A kind of synthetic method of quantum dot

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