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A kind of organic electroluminescent device and display device

A technology of electroluminescent devices and organic light-emitting layers, which is applied in the direction of organic semiconductor devices, electric solid-state devices, and luminescent materials. It can solve the problems of large efficiency roll-off, poor color purity, and short device life, so as to reduce efficiency roll-off , enhance stability, and broaden the effect of compounding areas

Active Publication Date: 2019-09-10
KUNSHAN GO VISIONOX OPTO ELECTRONICS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides an organic electroluminescent device and a display device. The organic light-emitting layer of the device uses a wide bandgap material as the main material, and uses an exciplex as a sensitizer material to assist sensitized resonance type TADF dyes to emit light, thereby overcoming At this stage, the defects of short device life, large efficiency roll-off, and poor color purity caused by the use of traditional TADF materials for light emission

Method used

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  • A kind of organic electroluminescent device and display device
  • A kind of organic electroluminescent device and display device
  • A kind of organic electroluminescent device and display device

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preparation example Construction

[0097] The present invention also provides a preparation method of the organic electroluminescent device, to figure 1 As an example, it includes sequentially depositing an anode 2 , a hole transport region 3 , an organic light-emitting layer 4 , an electron transport region 5 , and a cathode 6 on a substrate 1 , and then packaging. Wherein, when preparing the organic light-emitting layer 4, the organic light-emitting layer 4 is formed by co-evaporating a wide bandgap material source, an electron donor type material source, an electron acceptor type material source and a resonance type TADF material source.

[0098] Specifically, the preparation method of the organic electroluminescent device of the present invention comprises the following steps:

[0099] 1. Ultrasonically treat the glass plate coated with the anode material in a commercial cleaning agent, rinse in deionized water, ultrasonically degrease in acetone: ethanol mixed solvent, bake in a clean environment until the...

Embodiment 1

[0108] The device structure of this embodiment is as follows:

[0109] ITO / HI-2(10nm) / HT-27(40nm) / W-7:10wt%(D-1:A-6=1:9):5wt%M-20(30nm) / ET-53(30nm ) / LiF(0.5nm) / Al(150nm)

[0110] Wherein, the anode is ITO; the material of the hole injection layer is HI-2, and the general total thickness is 5-30nm, which is 10nm in this embodiment; the material of the hole transport layer is HT-27, and the total thickness is generally 5-50nm, This embodiment is 40nm; the host material of the organic light-emitting layer is the wide bandgap material W-7, and the mass ratio of D-1 to A-6 in the sensitizer material exciplex is 1:9, and the sum of the two masses occupies The ratio of the organic light-emitting layer is 10wt%, the dye is the resonance type TADF material M-20 and the doping concentration is 5wt%, the thickness of the organic light-emitting layer is generally 1-60nm, and this embodiment is 30nm; the material of the electron transport layer is ET -53, the thickness is generally 5-30n...

Embodiment 2

[0113] The device structure of this embodiment is as follows:

[0114] ITO / HI-2(10nm) / HT-27(40nm) / W-7:10wt%(D-1:A-6=4:6):5wt%M-20(30nm) / ET-53(30nm ) / LiF(0.5nm) / Al(150nm)

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Abstract

The invention provides an organic electroluminescent device and a display device. The organic electroluminescent device includes an organic light-emitting layer, and the organic light-emitting layer includes a host material, a sensitizer material, and a resonance-type heat-activated delayed fluorescent material; the host material is a wide band gap material; the sensitizer material is an exciplex material; the singlet energy level of the wide bandgap material is greater than that of the exciplex, and the triplet energy level of the wide bandgap material is greater than that of the exciplex Energy level, the singlet energy level of the exciplex material is greater than that of the resonance-type delayed fluorescence material, and the triplet energy level of the exciplex material is greater than that of the resonance-type delayed fluorescence material. The invention can overcome the defects of short device life and wide spectrum caused by using traditional TADF materials to emit light at the present stage.

Description

technical field [0001] The invention relates to an organic electroluminescence device and a display device, belonging to the technical field of organic electroluminescence. Background technique [0002] Organic Light Emitting Diode (OLED) is a device that is driven by current to achieve the purpose of emitting light. Its main characteristics come from the organic light-emitting layer. When an appropriate voltage is applied, electrons and holes Excitons are combined in the organic light-emitting layer to emit light of different wavelengths according to the characteristics of the organic light-emitting layer. At present, the light-emitting layer is composed of host materials and doped dyes, and the dyes are mostly selected from traditional fluorescent materials and traditional phosphorescent materials. Specifically, traditional fluorescent materials have the disadvantage of being unable to utilize triplet excitons. Although traditional phosphorescent materials can achieve 100...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/50H01L51/54H10K99/00
CPCH10K50/121H10K50/11H10K2101/10H10K85/658H10K85/625H10K85/631H10K2101/40H10K50/12H10K2101/30H10K2101/20C09K11/06C09K2211/1022H10K85/654H10K85/322H10K85/6572
Inventor 段炼蔡明瀚宋晓增魏金贝
Owner KUNSHAN GO VISIONOX OPTO ELECTRONICS CO LTD