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Organic light emitting device with barrier layer

An electroluminescent device and barrier layer technology, which is applied in the direction of electro-solid devices, electrical components, semiconductor devices, etc., can solve the problems of low luminous efficiency, triplet energy level mismatch, etc., to ensure luminous efficiency, excellent luminous efficiency, Easy to choose effects

Active Publication Date: 2014-07-02
GUAN YEOLIGHT TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] For this reason, the technical problem to be solved by the present invention is that in the prior art, the triplet energy level mismatch easily occurs between the blue fluorescent light-emitting layer and the red-green phosphorescent light-emitting layer, resulting in low luminous efficiency. Barrier layers for electroluminescent devices;

Method used

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  • Organic light emitting device with barrier layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0116] Organic electroluminescent device structure:

[0117] ITO / 2-TNATA(60nm) / NPB(20nm) / EMLR / EMLG-1 / Spacer(10nm) / EML-B / BPhen(30nm) / LiF(3nm) / Al(150nm)

[0118] Such as image 3 As shown, it is a cross-sectional view of the structure of Embodiment 1 of the present invention, which includes a substrate 10, an anode layer 20, a hole injection layer 30, a hole transport layer 40, a red phosphorescence emitting layer 50, a green phosphorescence emitting layer 60, and a barrier layer 70 , a blue fluorescent light-emitting layer 80 , an electron transport layer 90 , and a cathode layer 100 .

[0119] The preparation method of the organic light-emitting device is as follows:

[0120] ① Clean the ITO glass substrate that has been etched with a fixed pattern by using detergent ultrasonic and deionized water ultrasonic method, and place it under an infrared lamp to dry.

[0121] ②Place the above-mentioned treated glass substrate in the vacuum chamber, and evacuate to 1×10 -5 Pa, cont...

Embodiment 2

[0132] Organic electroluminescent device structure:

[0133] ITO / 2-TNATA(60nm) / NPB(20nm) / EML-R / EMLG-2 / Spacer(10nm) / EML-B / BPhen(30nm) / LiF(3nm) / Al(150nm)

[0134] The preparation method is the same as that in Example 1, except that the material of the green phosphorescence emitting layer in step ④ is replaced.

Embodiment 3

[0136] Organic electroluminescent device structure:

[0137] ITO / 2-TNATA(60nm) / NPB(20nm) / EML-B / Spacer(10nm) / EMLG-1 / EMLR / BPhen(30nm) / LiF(3nm) / Al(150nm)

[0138] The preparation method is the same as in Example 1, except that step ④ is changed to be implemented after step ⑥, and the evaporation sequence of the green phosphorescent layer is reversed with that of the red phosphorescent layer.

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Abstract

The invention relates to a barrier layer and an organic light emitting device with a barrier layer. The organic light emitting device comprises a substrate, and an anode layer, a light emitting unit layer and a cathode layer which are sequentially formed on the substrate. The light emitting unit layer includes a hole injection layer, a hole transport layer, light emitting layers and an electron transport layer, wherein the hole injection layer is formed on the anode layer, the hole transport layer is formed on the hole injection layer, the cathode layer is formed on the electron transport layer, the plurality of light emitting layers are arranged between the hole transport layer and the electron transport layer, the light emitting layers include a fluorescent light emitting layer and phosphorescent light emitting layers, and a barrier layer is arranged between the fluorescent light emitting layer and the phosphorescent light emitting layers. The main materials of the barrier layer include an electron transport material and a hole transport material which have the same mother nucleus. The electron transport efficiency and the hole transport efficiency of the organic light emitting device of the invention can be effectively adjusted, and the organic light emitting device has the advantage of high light emitting efficiency.

Description

technical field [0001] The invention relates to the technical field of organic electroluminescent devices, in particular to a barrier layer of an organic electroluminescent device, and also relates to an organic electroluminescent device provided with the barrier layer. Background technique [0002] The light-emitting layer of the organic electroluminescent device OLED is mainly made of all fluorescent materials, all phosphorescent materials or a mixture of fluorescent materials and phosphorescent materials. Phosphorescent materials can achieve high luminous efficiency, but due to short lifetime and low efficiency, no suitable blue phosphorescent materials have been developed yet. Although the chromaticity and lifetime of the all-fluorescent material have strong advantages, the efficiency of the structure mixed with the all-phosphorescent material layer is low. At present, blue fluorescent materials and red-green phosphorescent materials are generally used together as the l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50
CPCH10K85/615H10K30/865H10K50/15H10K50/16
Inventor 邱勇段炼李艳蕊张嵩李建仁张国辉
Owner GUAN YEOLIGHT TECH CO LTD
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