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Green organic electroluminescent device and fabrication method thereof

An electroluminescent and organic technology, applied in the field of green organic electroluminescent devices and their preparation, can solve the problems of unfavorable device carrier injection, high device operating voltage, affecting device working life, etc. Luminous efficiency, the effect of delaying the decay of efficiency

Active Publication Date: 2013-03-20
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The device has good efficiency stability and high maximum luminous brightness, but the wide luminous range of the device leads to low luminous efficiency of the device, and the design of the unipolar light-emitting layer is not conducive to the device to obtain balanced carriers Injection, which in turn leads to a higher working voltage of the device, which also affects the working life of the device

Method used

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  • Green organic electroluminescent device and fabrication method thereof
  • Green organic electroluminescent device and fabrication method thereof
  • Green organic electroluminescent device and fabrication method thereof

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preparation example Construction

[0063] The present invention also provides a preparation method of a green organic electroluminescence device, comprising:

[0064] forming an anode layer on the substrate;

[0065] A hole-dominated light-emitting layer is formed on the anode layer, and the hole-dominated light-emitting layer is formed by doping a green organic light-emitting material in a hole-type organic host material, and the green organic light-emitting material occupies the hole-type organic host material. The mass percentage of the host material is 5.0%~12.0%, and the green organic luminescent material is tris(2-phenylpyridine)iridium;

[0066] An electron-dominated light-emitting layer is formed on the hole-dominated light-emitting layer, and the electron-dominated light-emitting layer is formed by doping a green organic light-emitting material in an electron-type organic host material, and the green organic light-emitting material occupies the electron-type organic host material. The mass percentage ...

Embodiment 1

[0092] Glass is used as the substrate; an anode layer of indium tin oxide (ITO) material is formed on the glass substrate, and the anode layer is chemically etched into strip electrodes with a width of 10 mm and a length of 30 mm, and the strip electrodes are cleaned with Ultrasonic cleaning of liquid and deionized water for 15 minutes and drying in an oven. The dried electrode was subjected to low-pressure oxygen plasma treatment with a voltage of 400 volts for 10 minutes on the ITO anode in an atmosphere with a vacuum degree of 10 Pa. Transfer to the organic evaporation chamber, in a vacuum of 1~2×10 -5 In the organic evaporation chamber of Pascal, a 50-nanometer-thick hole-transporting layer was sequentially deposited on the anode layer at a TAPC evaporation rate of 0.05 nm / s, and Ir(ppy) 3 Evaporate 5nm thick Ir(ppy) at 0.006nm / s and MCP at 0.1nm / s 3 Hole-dominated light-emitting layer doped with MCP, Ir(ppy) 3 Evaporate 5nm thick Ir(ppy) at 0.008nm / s and TmPyPB at 0.1nm...

Embodiment 2

[0096] Glass is used as the substrate; an anode layer of indium tin oxide (ITO) material is formed on the glass substrate, and the anode layer is chemically etched into strip electrodes with a width of 10 mm and a length of 30 mm, and the strip electrodes are cleaned with Ultrasonic cleaning of liquid and deionized water for 15 minutes and drying in an oven. The dried electrode was subjected to low-pressure oxygen plasma treatment with a voltage of 400 volts for 10 minutes on the ITO anode in an atmosphere with a vacuum degree of 10 Pa. Transfer to the organic evaporation chamber, in a vacuum of 1~2×10 -5 In the organic evaporation chamber of Pascal, a 50-nanometer-thick hole-transporting layer was sequentially deposited on the anode layer at a TAPC evaporation rate of 0.05 nm / s, and Ir(ppy) 3 Evaporate 8nm thick Ir(ppy) at 0.006nm / s and MCP at 0.1nm / s 3 Hole-dominated light-emitting layer doped with MCP, Ir(ppy) 3 Evaporate 8nm thick Ir(ppy) at 0.008nm / s and TmPyPB at 0.1nm...

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Abstract

The invention provides a green organic electroluminescent device. The device adopts tri-(2-phenylpyridine) synthetic iridium as a green organic luminescent material. The luminescent material has both high luminescent efficiency and good electron transmission capacity; a range of a luminescent zone is limited by optimizing doping concentration of the luminescent material in a cavity leading luminescent layer and an electron leading luminescent layer respectively; the equilibrium distribution of electrons and cavities at a compounding zone is ensured; and the efficiency reduction of the device is retarded, so that the device obtains high-luminance green electroluminescence at a lower operating voltage, that is the efficiency stability and the luminance of the green organic electroluminescent device are improved, the working voltage of the device is reduced, the thermostability of the device is improved, and the life of the device is prolonged.

Description

technical field [0001] The invention relates to the technical field of organic electroluminescence, in particular to a green organic electroluminescence device and a preparation method thereof. Background technique [0002] An organic electroluminescent device is a self-luminous device that generates light when charges are injected into an organic film between a hole-injecting electrode (anode) and an electron-injecting electrode (cathode) and electrons and holes combine and then annihilate . Organic electroluminescent devices have the characteristics of low voltage, high brightness, and wide viewing angle, so organic electroluminescent devices have been developed rapidly in recent years. Among them, green organic electroluminescent devices are due to their advantages in monochrome display and white light modulation. The application prospect has become a research hotspot at present. [0003] For a long time, many research teams at home and abroad have started from the aspe...

Claims

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Application Information

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IPC IPC(8): H01L51/52H01L51/54H01L51/56C09K11/06
Inventor 周亮张洪杰邓瑞平冯婧宋明星郝召民
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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