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CN102280592A - Luminous color adjustable organic electroluminescent device based on single luminous material - Google Patents

Luminous color adjustable organic electroluminescent device based on single luminous material Download PDF

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Publication number
CN102280592A
CN102280592A CN2011102368692A CN201110236869A CN102280592A CN 102280592 A CN102280592 A CN 102280592A CN 2011102368692 A CN2011102368692 A CN 2011102368692A CN 201110236869 A CN201110236869 A CN 201110236869A CN 102280592 A CN102280592 A CN 102280592A
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pyridine
layer
polyvinylcarbazole
luminous
mixing quality
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CN102280592B (en
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张福俊
王健
卓祖亮
徐晓伟
辛宇胜
王琎
王梓轩
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Beijing Jiaotong University
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Beijing Jiaotong University
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
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    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps

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Abstract

The invention discloses a luminous color adjustable organic electroluminescent device based on a single luminous material, relates to an organic electroluminescent device, and solves the problem of low stability of the conventional organic white electroluminescent device. The device comprises an anode modification layer (2) made of poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate), a luminous layer (3), an electron transport layer (4) made of 4,7-diphenyl-1,10-phenanthroline, a cathode modification layer (5) made of lithium fluoride or cesium carbonate, and a metal cathode (6), which are prepared on indium tin oxide (ITO) conductive glass (1) in turn, wherein the luminous layer (3) is made of bis(4,6-difluorophenylpyridinato-N,C2)picolinatoiridium and polyvinylcarbazole, and emits blue light when a mixing mass ratio of the bis(4,6-difluorophenylpyridinato-N,C2)picolinatoiridium to the polyvinylcarbazole is 1-10 percent; when the mixing mass ratio is 30-60 percent, the luminous layer emits partial blue light; when the mixing mass ratio is 65-80 percent, the luminous layer emits partial green light; and when the mixing mass ratio is 85-100 percent, the luminous layer emits yellow green light. The blue light and green light needed by a white light device are obtained based on one material, the material variety is reduced, and the performance of the device is stable.

Description

Realize the adjustable organic electroluminescence device of glow color based on single luminescent material
Technical field
The present invention relates to a kind of organic electroluminescence device, be specifically related to a kind of organic electromechanical phosphorescent material two (4,6-difluorophenyl pyridine-N, C2) the pyridine formyl closes the luminescence mechanism of iridium (FIrpic) and the regulation and control of glow color thereof.
Background technology
The human at present dependence to illumination and Display Technique is more and more stronger, and development of new environmental protection demonstration and lighting technology have become one of focal issue of people's research.That organic electroluminescence device has is low in energy consumption, brightness is high, efficient, can be used for making advantages such as flexible luminescent device, large area lighting light source and novel Display Technique, causes that the various countries expert pays close attention to widely.Electronics on the organic electromechanical phosphorescent material triplet excited states can be luminous to ground state transition, therefore becomes the emphasis of people's research, and organic electro phosphorescent device becomes the effective way that improves the organic electroluminescence device luminous efficiency.The research of organic electrophosphorescenpolymer white light parts in recent years deepens continuously, and internal quantum efficiency is near 100%, and light output coupling efficiency improves constantly, and its external quantum efficiency breaks through 20%, but the stability of device also need increase substantially.Influence its stable main cause: 1) the device luminescent layer generally adopts sandwich construction or multiple adulterate single transmit layer structure, and the kind of material is more, the rate of ageing difference of various materials, thus influence the bulk life time of device; 2) diversity of luminescent layer material causes the device preparation technology complexity, and the organic electro phosphorescent device that causes obtaining the high-performance white light emission is difficulty relatively.
Summary of the invention
Technical problem to be solved by this invention is existing organic electroluminescent white light device stability problem, utilizes a kind of luminescent material to obtain the organic electro phosphorescent device of different glow colors, for the organic electroluminescence device of preparation white light emission provides a kind of scheme.
Technical scheme of the present invention:
Realize the adjustable organic electroluminescence device of glow color based on single luminescent material, this device is included in and prepares its material of anode modification layer on the ITO electro-conductive glass successively for gathering (3, the 4-Ethylenedioxy Thiophene)-poly-(styrene sulfonic acid) (PEDOT:PSS), luminescent layer, its material of electron transfer layer is 4,7-diphenyl-1,10 phenanthroline (Bphen), its material of cathodic modification layer are lithium fluoride or cesium carbonate and metallic cathode.
The material of described luminescent layer is:
Two (4,6-difluorophenyl pyridine-N, C2) the pyridine formyl closes iridium: the mixing quality of polyvinylcarbazole produces blue light than 1%～10%;
Two (4,6-difluorophenyl pyridine-N, C2) the pyridine formyl closes iridium: the mixing quality of polyvinylcarbazole produces inclined to one side blue light than 30%～60%;
Two (4,6-difluorophenyl pyridine-N, C2) the pyridine formyl closes iridium: the mixing quality of polyvinylcarbazole produces inclined to one side green glow than 65%～80%;
Two (4,6-difluorophenyl pyridine-N, C2) the pyridine formyl closes iridium: the mixing quality of polyvinylcarbazole produces green-yellow light than 85%～100%.
Beneficial effect of the present invention:
Of the present invention based on the adjustable organic electroluminescence device of single luminescent material realization glow color, luminescent layer adopts different two (4 of the mass ratioes that mix, 6-difluorophenyl pyridine-N, C2) the pyridine formyl closes iridium (FIrpic) and polyvinylcarbazole (PVK), realized the luminous of different colours, for the organic electroluminescence device for preparing white light emission provides a kind of scheme.
Description of drawings
Fig. 1 realizes the adjustable organic electroluminescence device schematic diagram of glow color based on single luminescent material.
Among the figure: ITO electro-conductive glass 1, anode modification layer 2, luminescent layer 3, electron transfer layer 4, cathodic modification layer 5, metal electrode 6.
Different luminescence generated by light (PL) spectrum of luminescent layer under the 380nm exciting light that mix mass ratio of Fig. 2;
Among the figure: the A mixing quality is than the PL spectrum of luminescent layer under the 380nm exciting light that is 8%;
The B mixing quality is than the PL spectrum of luminescent layer under the 380nm exciting light that is 50%;
The C mixing quality is than the PL spectrum of luminescent layer under the 380nm exciting light that is 67%;
The D mixing quality is than the PL spectrum of luminescent layer under the 380nm exciting light that is 100%.
Different electroluminescence (EL) spectrum of organic electroluminescence device under 12V that mix the luminescent layer of mass ratio of Fig. 3;
Among the figure: the mixing quality of a luminescent layer is than 8% the EL spectrum of organic electroluminescence device under 12V;
The mixing quality of b luminescent layer is than 50% the EL spectrum of organic electroluminescence device under 12V;
The mixing quality of c luminescent layer is than 67% the EL spectrum of organic electroluminescence device under 12V;
The mixing quality of d luminescent layer is than 100% the EL spectrum of organic electroluminescence device under 12V.
Embodiment
Embodiment one
Realize the adjustable organic electroluminescence device of glow color based on single luminescent material, this device is included in and prepares anode modification layer 2 its material on the ITO electro-conductive glass 1 successively for gathering (3, the 4-Ethylenedioxy Thiophene)-poly-(styrene sulfonic acid) (PEDOT:PSS), thickness is 40nm, luminescent layer 3, thickness is 60nm, electron transfer layer 4 its materials are 4,7-diphenyl-1,10 phenanthroline (Bphen), thickness are 30nm, cathodic modification layer 5 its material are lithium fluoride, thickness is 0.8nm, and metallic cathode 6, thickness are 100nm.
The material of described luminescent layer 3 is:
Two (4,6-difluorophenyl pyridine-N, C2) the pyridine formyl closes iridium: the mixing quality of polyvinylcarbazole is than 8%, make based on two (4,6-difluorophenyl pyridine-N, C2) the pyridine formyl closes the organic electroluminescence device that iridium produces blue light.
Above-mentioned organic electroluminescence device is carried out 100 ℃ of heat treatments 10 minutes.
Embodiment two
Embodiment two with the difference of embodiment one is:
The material of described luminescent layer 3 is:
Two (4,6-difluorophenyl pyridine-N, C2) the pyridine formyl closes iridium: the mixing quality of polyvinylcarbazole is than 1%, make based on two (4,6-difluorophenyl pyridine-N, C2) the pyridine formyl closes the organic electroluminescence device that iridium produces blue light.
Embodiment three
Embodiment three with the difference of embodiment one is:
The material of described luminescent layer 3 is:
Two (4,6-difluorophenyl pyridine-N, C2) the pyridine formyl closes iridium: the mixing quality of polyvinylcarbazole is than 10%, make based on two (4,6-difluorophenyl pyridine-N, C2) the pyridine formyl closes the organic electroluminescence device that iridium produces blue light.
Cathodic modification layer 5 its material are cesium carbonate, and thickness is 4nm.
Embodiment four
Realize the adjustable organic electroluminescence device of glow color based on single luminescent material, this device is included in and prepares anode modification layer 2 its material on the ITO electro-conductive glass 1 successively for gathering (3, the 4-Ethylenedioxy Thiophene)-poly-(styrene sulfonic acid) (PEDOT:PSS), thickness is 40nm, luminescent layer 3, thickness is 60nm, electron transfer layer 4 its materials are 4,7-diphenyl-1,10 phenanthrolines (Bphen), thickness are 30nm, and cathodic modification layer 5 its material are lithium fluoride, thickness is 0.8nm and metallic cathode 6, and thickness is 100nm.
The material of described luminescent layer 3 is:
Two (4,6-difluorophenyl pyridine-N, C2) the pyridine formyl closes iridium: the mixing quality of polyvinylcarbazole is than 30%, make based on two (4,6-difluorophenyl pyridine-N, C2) the pyridine formyl closes the organic electroluminescence device that iridium produces inclined to one side blue light.
Above-mentioned organic electroluminescence device is carried out 100 ℃ of heat treatments 10 minutes.
Embodiment five
Embodiment five with the difference of embodiment four is:
The material of described luminescent layer 3 is:
Two (4,6-difluorophenyl pyridine-N, C2) the pyridine formyl closes iridium: the mixing quality of polyvinylcarbazole is than 50%, make based on two (4,6-difluorophenyl pyridine-N, C2) the pyridine formyl closes the organic electroluminescence device that iridium produces inclined to one side blue light.
Cathodic modification layer 5 its material are cesium carbonate, and thickness is 4nm.
Embodiment six
Embodiment six with the difference of embodiment four is:
The material of described luminescent layer 3 is:
Two (4,6-difluorophenyl pyridine-N, C2) the pyridine formyl closes iridium: the mixing quality of polyvinylcarbazole is than 60%, make based on two (4,6-difluorophenyl pyridine-N, C2) the pyridine formyl closes the organic electroluminescence device that iridium produces inclined to one side blue light.
Embodiment seven
Realize the adjustable organic electroluminescence device of glow color based on single luminescent material, this device is included in and prepares anode modification layer 2 its material on the ITO electro-conductive glass 1 successively for gathering (3, the 4-Ethylenedioxy Thiophene)-poly-(styrene sulfonic acid) (PEDOT:PSS), thickness is 40nm, luminescent layer 3, thickness is 60nm, electron transfer layer 4 its materials are 4,7-diphenyl-1,10 phenanthrolines (Bphen), thickness are 30nm, and cathodic modification layer 5 its material are lithium fluoride, thickness is 0.8nm and metallic cathode 6, and thickness is 100nm.
The material of described luminescent layer 3 is:
Two (4,6-difluorophenyl pyridine-N, C2) the pyridine formyl closes iridium: the mixing quality of polyvinylcarbazole is than 65%, make based on two (4,6-difluorophenyl pyridine-N, C2) the pyridine formyl closes the organic electroluminescence device that iridium produces inclined to one side green glow.
Above-mentioned organic electroluminescence device is carried out 100 ℃ of heat treatments 10 minutes.
Embodiment eight
Embodiment eight with the difference of embodiment seven is:
The material of described luminescent layer 3 is:
Two (4,6-difluorophenyl pyridine-N, C2) the pyridine formyl closes iridium: the mixing quality of polyvinylcarbazole is than 67%, make based on two (4,6-difluorophenyl pyridine-N, C2) the pyridine formyl closes the organic electroluminescence device that iridium produces inclined to one side green glow.
Embodiment nine
Embodiment nine with the difference of embodiment seven is:
The material of described luminescent layer 3 is:
Two (4,6-difluorophenyl pyridine-N, C2) the pyridine formyl closes iridium: the mixing quality of polyvinylcarbazole is than 80%, make based on two (4,6-difluorophenyl pyridine-N, C2) the pyridine formyl closes the organic electroluminescence device that iridium produces inclined to one side green glow.
Embodiment ten
Realize the adjustable organic electroluminescence device of glow color based on single luminescent material, this device is included in and prepares anode modification layer 2 its material on the ITO electro-conductive glass 1 successively for gathering (3, the 4-Ethylenedioxy Thiophene)-poly-(styrene sulfonic acid) (PEDOT:PSS), thickness is 40nm, luminescent layer 3, thickness is that 60nm electron transfer layer 4 its materials are 4,7-diphenyl-1,10 phenanthrolines (Bphen), thickness are 30nm, and cathodic modification layer 5 its material are cesium carbonate, thickness is 4nm, with metallic cathode 6, thickness is 100nm.
The material of described luminescent layer 3 is:
Two (4,6-difluorophenyl pyridine-N, C2) the pyridine formyl closes iridium: the mixing quality of polyvinylcarbazole is than 85%, make based on two (4,6-difluorophenyl pyridine-N, C2) the pyridine formyl closes the organic electroluminescence device that iridium produces green-yellow light.
Above-mentioned organic electroluminescence device is carried out 100 ℃ of heat treatments 10 minutes.
Embodiment 11
Embodiment 11 with the difference of embodiment ten is:
The material of described luminescent layer 3 is:
Two (4,6-difluorophenyl pyridine-N, C2) the pyridine formyl closes iridium: the mixing quality of polyvinylcarbazole is than 92%, make based on two (4,6-difluorophenyl pyridine-N, C2) the pyridine formyl closes the organic electroluminescence device that iridium produces green-yellow light.
Embodiment 12
Embodiment 12 with the difference of embodiment ten is:
The material of described luminescent layer 3 is:
Two (4,6-difluorophenyl pyridine-N, C2) the pyridine formyl closes iridium: the mixing quality of polyvinylcarbazole is than 100%, make based on two (4,6-difluorophenyl pyridine-N, C2) the pyridine formyl closes the organic electroluminescence device that iridium produces green-yellow light.
Preparation method based on the adjustable organic electroluminescence device of single luminescent material realization glow color may further comprise the steps:
Step 1 is soaked in ITO electro-conductive glass 1 respectively in deionized water, acetone, the ethanolic solution, cleans with ultrasonic washing instrument.Clean up the back and dry up, the substrate surface of drying was handled 10 minutes with UV ozone, improve the cleannes of substrate surface and the work function on ITO surface with nitrogen.
Spin coating anode modification layer 2PEDOT:PSS on the ITO substrate that step 2 disposes in step 1, its spin coating speed is 4000-6000 rev/min, capacity 150 microlitres, were annealed 10 minutes under 130 ℃ of temperature afterwards at 50 seconds spin coating time.
Step 3 has preparation luminescent layer 3 on the ITO substrate of PEDOT:PSS in spin coating, its spin coating speed is 3000 rev/mins, 40 seconds spin coating time.
Step 4 is put into vacuum chamber with sample, and vacuum chamber is vacuumized, and makes vacuum degree reach 10 -5Handkerchief.Regulate the rotary speed of support, making the speed of rotation is 0.25 revolutions per second.
Step 5 heating evaporation source, preparation electron transfer layer 4Bphen, the control evaporation rate is 0.4 nm/sec.
Step 6 moves to inorganic chamber with sample, and vacuum is evacuated to 10 -4Handkerchief.Heating evaporation source, control evaporation rate are about 0.01～0.04nm/s, and evaporation thickness is the cathodic modification layer 5LiF of 0.8nm; Or control evaporation rate about 0.1～0.4nm/s, evaporation thickness is the cathodic modification layer 5Cs of 4nm 2CO 3.
Step 7 is on cathodic modification layer 5, and deposition material is Al, and evaporation rate is 0.2 nm/sec, and thickness is the metallic cathode 6 of 100 nanometers.
After finishing, the step 8 element manufacturing under 100 ℃ of temperature, annealed 10 minutes.The electroluminescent spectrum of test organic electroluminescence device.

Claims (1)

1. realize the adjustable organic electroluminescence device of glow color based on single luminescent material, this device is included in and prepares its material of anode modification layer (2) on the ITO electro-conductive glass (1) successively for gathering (3, the 4-Ethylenedioxy Thiophene)-poly-(styrene sulfonic acid), luminescent layer (3), its material of electron transfer layer (4) is 4,7-diphenyl-1,10 phenanthroline, its material of cathodic modification layer (5) are lithium fluoride or cesium carbonate and metallic cathode (6); It is characterized in that:
The material of described luminescent layer (3) is:
Two (4,6-difluorophenyl pyridine-N, C2) the pyridine formyl closes iridium: the mixing quality of polyvinylcarbazole produces blue light than 1%～10%;
Two (4,6-difluorophenyl pyridine-N, C2) the pyridine formyl closes iridium: the mixing quality of polyvinylcarbazole produces inclined to one side blue light than 30%～60%;
Two (4,6-difluorophenyl pyridine-N, C2) the pyridine formyl closes iridium: the mixing quality of polyvinylcarbazole produces inclined to one side green glow than 65%～80%;
Two (4,6-difluorophenyl pyridine-N, C2) the pyridine formyl closes iridium: the mixing quality of polyvinylcarbazole produces green-yellow light than 85%～100%.
CN2011102368692A 2011-08-18 2011-08-18 Luminous color adjustable organic electroluminescent device based on single luminous material Expired - Fee Related CN102280592B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106784387A (en) * 2017-01-16 2017-05-31 京东方科技集团股份有限公司 A kind of Organic Light Emitting Diode, display base plate and display device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050196638A1 (en) * 2004-02-11 2005-09-08 Hae-Jung Son Organic electroluminescent device
CN1921171A (en) * 2006-09-14 2007-02-28 电子科技大学 White light organic electroluminescent device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050196638A1 (en) * 2004-02-11 2005-09-08 Hae-Jung Son Organic electroluminescent device
CN1921171A (en) * 2006-09-14 2007-02-28 电子科技大学 White light organic electroluminescent device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106784387A (en) * 2017-01-16 2017-05-31 京东方科技集团股份有限公司 A kind of Organic Light Emitting Diode, display base plate and display device

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