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Organic electroluminescent device

An electroluminescent device and electroluminescent technology, which can be applied in the direction of electro-solid devices, electrical components, semiconductor devices, etc., and can solve the problems of high voltage, low brightness, low efficiency, etc.

Active Publication Date: 2010-05-19
TSINGHUA UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Early organic electroluminescence hovered at the level of high voltage, low brightness, and low efficiency

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] figure 1 It is a cross-sectional view of the structure of the organic electroluminescent device in this embodiment, including a substrate 10 , an anode layer 20 , a hole transport layer 30 , a light emitting layer 40 , a first cathode layer 50 , a second cathode layer 60 and a third cathode layer 70 . The device structure of the organic electroluminescent device in this embodiment is as follows:

[0027] Glass substrate / ITO / NPB(50nm) / Alq 3 (50nm) / Li 3 N(1nm) / Mg:Ag(100nm, 10%) / Ag(80nm)

[0028] Preparation steps:

[0029] (1) Preparation of organic light-emitting layer

[0030] An ITO (indium tin oxide) film is prepared on the glass substrate as an anode, the sheet resistance of the ITO film is 50Ω, and the film thickness is 150 nm. Place the glass substrate with the prepared anode in the vacuum chamber and evacuate to 1×10 -3 Pa, the hole transport material NPB is evaporated, the evaporation rate of the material film is 0.1nm / s, and the film thickness is 50nm; on ...

Embodiment 2

[0037] The structural cross-sectional view of the organic electroluminescent device in this embodiment is as follows figure 1 As shown, the substrate 10 , the anode layer 20 , the hole transport layer 30 , the light emitting layer 40 , the first cathode layer 50 , the second cathode layer 60 and the third cathode layer 70 . The device structure of the organic electroluminescent device in the embodiment of the present invention is as follows:

[0038] Glass substrate / ITO / NPB(50nm) / Alq 3 (50nm) / CsCO 3 (2nm) / Mg:Al(300nm, 20%) / Al(50nm)

[0039] Preparation steps:

[0040] (1) Preparation of the organic light-emitting layer: same as the preparation step (1) of Example 1.

[0041] (2) Preparation of cathode layer

[0042] Evaporate 2nm CsCO on the emitting layer 3 As the first cathode layer of the device, its evaporation rate is 0.05nm / s;

[0043] After the first cathode layer was prepared, the second cathode layer was prepared by vapor deposition, and the mixture of Mg and A...

Embodiment 3

[0047] The structural cross-sectional view of the organic electroluminescent device in this embodiment is as follows figure 1 As shown, the substrate 10 , the anode layer 20 , the hole transport layer 30 , the light emitting layer 40 , the first cathode layer 50 , the second cathode layer 60 and the third cathode layer 70 . The device structure of the organic electroluminescent device in the embodiment of the present invention is as follows:

[0048] Glass substrate / ITO / NPB(50nm) / Alq 3 (50nm) / KBH 4 (0.5nm) / Mg:Ag(50nm, 5%) / Ag(150nm)

[0049] Preparation steps:

[0050] (1) Preparation of the organic light-emitting layer: same as the preparation step (1) of Example 1.

[0051] (2) Preparation of cathode layer

[0052] Evaporate 0.5nm KBH on the light-emitting layer 4 As the first cathode layer of the device, its evaporation rate is 0.05nm / s;

[0053] After the first cathode layer was prepared, the second cathode layer was prepared by vapor deposition, and the mixture of M...

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Abstract

The invention discloses an organic electroluminescent device, which comprises a substrate, an anode layer formed on the substrate, an organic functional layer formed on the anode layer and cathode layers formed on the organic functional layer, wherein the cathode layers at least comprise a first cathode layer, a second cathode layer and a third cathode layer. A composite cathode of the organic electroluminescent device utilizes alkali metal and an alkaline earth alloy layer to reduce an electron injection potential barrier to improve the efficiency of electron injection obviously.

Description

technical field [0001] The invention relates to the field of organic electroluminescent devices, in particular to an organic electroluminescent device with an improved cathode layer. Background technique [0002] As early as the 1950s, Bernanose.A et al. started research on organic electroluminescent devices (OLEDs). The material initially studied was anthracene single crystal. Due to the problem of too thick single crystal (10-20μm), the required driving voltage is as high as hundreds of volts. In 1982, Vinceet made a 50nm-thick anthracene film by vacuum evaporation, and observed blue fluorescence at 30 volts, but its external quantum efficiency was only 0.03%. Early organic electroluminescence hovered at the level of high voltage, low brightness, and low efficiency. Until 1987, Deng Qingyun (C.W.Tang) and Vanslyke of Eastman Kodak Company in the United States reported the structure as: ITO / Diamine / Alq 3 / Mg:Ag organic small molecule electroluminescence device, the brigh...

Claims

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Application Information

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IPC IPC(8): H01L51/50H01L51/52H01L51/56
Inventor 邱勇段炼谢静
Owner TSINGHUA UNIV
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