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Organic electroluminescent device

An electroluminescent device, organic technology, applied in the direction of electric solid devices, electrical components, semiconductor devices, etc., can solve the problems of short brightness decay time and low device efficiency.

Active Publication Date: 2020-05-29
GUAN ETERNAL MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] This type of organic electroluminescent device, through the two-layer hole transport layer, can obtain higher operating current, but the device efficiency is low and the brightness decay time is shorter, which is closely related to the defects of the hole transport layer's own performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0155] On an anode glass substrate containing indium tin oxide (ITO) with a film thickness of 150 nm, the vacuum evaporation method is used to achieve a vacuum degree of 2*10 -4 Each film layer was deposited at Pa. First, a HT-a:3%HI-1 thin film was formed on ITO, the ratio of the evaporation rate of HT-a to HI-1 was 1:0.03, the evaporation rate of HT-a was 1 Å / s, and the total thickness was 50nm; then deposit HT-b with a thickness of 90nm, the evaporation rate is 1 Å / s, and then evaporate HT-1 with a thickness of 10nm, the above three-layer film forms the HTL system of this device. Then, the blue host BFH-1 and the dye BFD-1 were co-evaporated from different evaporation sources as the blue light emitting layer. The evaporation rate ratio of the host and the dye was 1:0.05. The thickness of the layer is 5 nm; BFH-1 and YPD-1 are co-evaporated from different evaporation sources as the yellow light emitting layer, and the evaporation rate ratio is 1:0.08, the evaporation rate o...

Embodiment 2

[0158] On an anode glass substrate containing indium tin oxide (ITO) with a film thickness of 150 nm, the vacuum evaporation method is used to achieve a vacuum degree of 2*10 -4 Each film layer was deposited at Pa. First, a HT-a:3%HI-1 film was formed on ITO, the ratio of the evaporation rate of HTA to HI-1 was 1:0.03, the evaporation rate of HT-a was 1 Å / s, and the total thickness was 70 nm; Next, HT-b with a thickness of 70 nm was deposited, and the evaporation rate was 1 Å / s, and then HT-1 with a thickness of 10 nm was deposited. The above three-layer film formed the HTL system of the device. Then, the blue host BFH-1 and the dye BFD-1 were co-evaporated from different evaporation sources as the blue light emitting layer. The evaporation rate ratio of the host and the dye was 1:0.05. The thickness of the layer is 5 nm; BFH-1 and YPD-1 are co-evaporated from different evaporation sources as the yellow light emitting layer, and the evaporation rate ratio is 1:0.08, the evapo...

Embodiment 3

[0161] On an anode glass substrate containing indium tin oxide (ITO) with a film thickness of 150 nm, the vacuum evaporation method is used to achieve a vacuum degree of 2*10 -4 Each film layer was deposited at Pa. First, a HT-a:3%HI-1 thin film was formed on ITO, the ratio of the evaporation rate of HT-a to HI-1 was 1:0.03, the evaporation rate of HT-a was 1 Å / s, and the total thickness was 50nm; then deposit HT-a with a thickness of 90nm, the evaporation rate is 1 Å / sec, and then evaporate HT-1 with a thickness of 10nm, the above three-layer film forms the HTL system of this device. Then, the blue host BFH-1 and the dye BFD-1 were co-evaporated from different evaporation sources as the blue light emitting layer. The evaporation rate ratio of the host and the dye was 1:0.05. The thickness of the layer is 5 nm; BFH-1 and YPD-1 are co-evaporated from different evaporation sources as the yellow light emitting layer, and the evaporation rate ratio is 1:0.08, the evaporation rate...

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Abstract

The invention provides an organic electroluminescent device. The organic electroluminescent device includes a cathode, an anode, hole transport layers and a light emitting layer, wherein the hole transport layers and the light emitting layer are included between the cathode and the anode. The organic electroluminescent device is characterized in that the hole transport layers sequentially comprises a first hole transport layer HTL1, a second hole transport layer HTL2 and a third hole transport layer HTL3 which are sequentially far away from the anode; the HTL1 comprises a hole transport material HTA; and the HTA is selected from one or more of compounds represented by the following general formula (1), the following general formula (2) or the following general formula (3).

Description

technical field [0001] The present invention relates to the technical field of organic electroluminescence devices, in particular to structures related to hole injection and transport in organic electroluminescence devices. Background technique [0002] The research of OLEDs began in the 1960s. The light-emitting layer was originally made of fluorescent materials, and the maximum internal quantum efficiency was only 25%, which limited the development of fluorescent OLEDs. Phosphorescent materials containing heavy metal atoms can increase the internal quantum efficiency of OLEDs to 100%, but the limited resources of rare metals, high prices, and the lack of efficient and stable blue phosphorescent materials still limit the commercial development of OLEDs. [0003] In order to obtain stable light emission, it is necessary to actively inject holes from the anode. In the prior art, the hole transport layer on the ITO anode includes two layers, and at the same time, the material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H01L51/54
CPCH10K85/60H10K50/156Y02E10/549
Inventor 吴俊宇刘嵩邵爽
Owner GUAN ETERNAL MATERIAL TECH
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