Composition for electron transport layer, electron transport layer and photoelectric device

A technology of electron transport layer and optoelectronic device, which is applied in the direction of electric solid-state devices, electrical components, semiconductor devices, etc., can solve the problems of interface damage, easy aging of electronic materials, fast brightness decay, etc., and achieve lower injection barrier and driving voltage , Improve luminous efficiency and lifespan, and improve the effect of short lifespan

Active Publication Date: 2020-10-30
JILIN OPTICAL & ELECTRONICS MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the development of OLED materials, organic materials that meet the performance requirements of OLED display panels tend to be electron-transporting. At room temperature, electron injection materials have no obvious impact on life, but at high temperatures, electron injection is slower than electron migration, resulting in electron transport. There is accumulation on the cathode side, and the electronic materials are easy to age, resulting in a shortened life of the OLED display panel
[0004] In addition, the light-emitting region of the device structure is close to the interface between the light-emitting layer and the hole, which is biased towards the electronic system. During the aging process of the life, the excitons have a greater impact on

Method used

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  • Composition for electron transport layer, electron transport layer and photoelectric device
  • Composition for electron transport layer, electron transport layer and photoelectric device
  • Composition for electron transport layer, electron transport layer and photoelectric device

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0033] Material Example 1

[0034] This embodiment provides 17 types of electron transport materials, the structural formulas of which are formula ET-1 to formula ET-17, and the details are as follows:

[0035]

[0036]

[0037] The electron mobility test is performed on the electron transport materials with the above structural formulas of formula ET-1 to formula ET-17. The test method is as follows:

[0038] Using vacuum evaporation equipment, vacuum evaporation is carried out on the substrate with ITO. Since the material to be tested is an electron transport material, a layer of electron blocking material with a thickness of 5nm is first evaporated, and then the evaporation is to be carried out on this basis. The thickness of the test material and Liq is 50nm. After the vapor deposition of the test material is completed, the vapor deposition has an electron injection type material with a thickness of 2nm. Finally, a layer of cathode is vapor deposited, which can be Ag, etc., and f...

Example Embodiment

[0041] Device Example 1

[0042] This embodiment provides a photoelectric device, and its preparation method includes the following steps:

[0043] S1. Put the ITO / Ag / ITO film (the thickness of ITO is 14nm and the thickness of Ag is 150nm) on the glass substrate (150nm) of the OLED device for 2 times in distilled water, ultrasonic washing for 30 minutes, and repeated washing with distilled water 2 times , Ultrasonic cleaning for 10 minutes, after the distilled water cleaning, solvents such as isopropanol, acetone, methanol and other solvents are ultrasonically washed in order and then dried, transferred to the plasma cleaning machine, washed for 5 minutes, and sent to the vapor deposition machine.

[0044] S2, the compound N,N'-diphenyl-N,N'-bis(2-naphthyl)-1,1'-biphenyl-4,4'-diamine (NPB) and 2,3,5 ,6-Tetrafluoro-7,7',8,8'-tetracyanoquinone-dimethane (F4-TCNQ) was introduced into the chamber of the vacuum vapor deposition equipment at a doping ratio of 97:3, and then the equipment ...

Example Embodiment

[0054] Device Example 2

[0055] This embodiment provides an optoelectronic device, which is prepared according to the preparation method provided in the device embodiment 1 above, with the only difference: replacing the material ET-1 / ET-2 of the electron transport layer with the material in embodiment 1 ET-1 / ET-5.

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Abstract

The invention discloses a composition for an electron transport layer, the electron transport layer and a photoelectric device, and belongs to the technical field of display, the composition comprises8-hydroxyquinoline-lithium and a composite material; the composite material comprises at least two electron transport materials of which the LUMO energy levels are -2.95eV to -2.70eV; and the mass percentage content of the 8-hydroxyquinoline-lithium in the composition is 40%-60%. The photoelectric device containing the composition enables electron injection to be faster at high temperature and current carrier recombination to be more balanced, so that the problem of short service life at high temperature is solved. Moreover, the electron transport material with a reasonable energy level structure is adopted, so that the energy level in each layer of the photoelectric device can form a stepped barrier, the injection barrier and the driving voltage can be reduced, and meanwhile, the reasonable carrier mobility is matched, so that the carrier recombination is more balanced, and the luminous efficiency and the service life of the device can be effectively improved.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a composition for an electron transport layer, an electron transport layer and a photoelectric device. Background technique [0002] Organic Light Emitting Diode (OLED) display panel is a self-luminous display panel. OLED display panel has the advantages of thinness, high brightness, low power consumption, wide viewing angle, high response speed and wide operating temperature range. It is increasingly used in various high-performance display fields. Optoelectronic devices such as organic electroluminescent devices generally have a multi-layer structure. Various auxiliary functional layers besides the light-emitting layer also play a vital role in device performance. A reasonable device structure can effectively improve the performance of the device. Electron injection Layers, electron-transporting layers, hole-blocking layers, light-emitting layers, electron-blocking layers, ho...

Claims

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Application Information

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IPC IPC(8): H01L51/50H01L51/54
CPCH10K85/00H10K50/11H10K2101/40H10K50/16
Inventor 王铁邱镇姚明明王伟哲刘长伟杨勇马晓宇
Owner JILIN OPTICAL & ELECTRONICS MATERIALS
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