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Organic electroluminescent device

An electroluminescence device and electroluminescence technology, which can be applied in the direction of electro-solid devices, electrical components, semiconductor devices, etc., and can solve the problems of high driving voltage and insufficient transmission.

Inactive Publication Date: 2016-12-07
BEIJING VISIONOX TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of high driving voltage and insufficient transmission of the above-mentioned devices, the present invention further proposes that the light-emitting layer of the OLED adopts a thermally activated delayed fluorescent material (TADF material) as the host material and doped with the TADF material as the guest material (fluorescent luminescent dye)

Method used

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Examples

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Embodiment 1

[0322] The TADF material HOST (compound 1-16) is used as the luminescent host, and another TADF material Dopant (compound 2-16) is doped as the dye (accounting for 3% of the mass of the luminescent layer), both. Wherein the forbidden band width of the luminescent host HOST (compound 1-16) is greater than that of the dye Dopant (compound 2-16), and the luminescence peak of the host material overlaps substantially with the absorption peak of the guest material (the electroluminescence spectrum of the host material After normalization with the photoabsorption spectrum of the guest material, the wavelength difference corresponding to the peak is within 50 nm).

[0323] The organic electroluminescence device structure of the present embodiment is as follows:

[0324] ITO / MTDATA:4%F4TCNQ(100nm) / NPB(20nm) / HOST(1-16):1% Dopant(2-16) (30nm) / Alq 3 (30nm) / LiF(1nm) / Al(150nm)

[0325] The experimental data of above-mentioned comparative example and embodiment are shown in the table belo...

Embodiment 2

[0332] TADF material Host (1-16) is used as the luminescent host, and Dopant (2-16) with a concentration of 50% (accounting for 50% of the mass of the luminescent layer) is used as the luminescent dye

[0333] The organic electroluminescence device structure of the present embodiment is as follows:

[0334] ITO / MTDATA:4%F4TCNQ(100nm) / NPB(20nm) / Host(1-16):50% Dopant(2-16) (30nm) / Alq 3 (30nm) / LiF(1nm) / Al(150nm)

Embodiment 3

[0336] The organic electroluminescence device structure of the present embodiment is as follows:

[0337] TADF material Host (1-16) is used as the luminescent host, and 30% concentration Dopant (2-16) is used as the luminescent dye

[0338] ITO / MTDATA:4%F4TCNQ(100nm) / NPB(20nm) / Host(1-16):30% Dopant(2-16) (30nm) / Alq 3 (30nm) / LiF(1nm) / Al(150nm)

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Abstract

The invention discloses an organic electroluminescent device, which comprises a light emitting layer. The host material of the light emitting layer is a thermal active delay fluorescent material; the guest material is a thermal active delay fluorescent material; the band gap of the host material is larger than that of the guest material; and after the photoluminescence spectrum of the host material and the light-induced absorption spectrum of the guest material are normalized, the wavelength difference corresponding to peak values is within 50 nm.

Description

technical field [0001] The invention belongs to the field of organic electroluminescent devices, in particular to an organic electroluminescent device whose luminescent layer adopts heat-activated delayed fluorescent material. Background technique [0002] In the electroluminescent process of organic electroluminescent devices, mainly rely on the electronic transition of organic light-emitting materials from the excited state to the ground state to generate light. At room temperature, the luminescence produced by the electronic transition from the triplet excited state back to the ground state is extremely weak, and most of its energy is lost in the form of heat. The luminescence is mainly produced by the electronic transition from the singlet excited state to the ground state, called electric current Fluoresces. Since triplet excited states are generated three times more frequently than singlet excited states, the equivalent of 75% of the energy is not used for light emiss...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/54
Inventor 段炼邱勇张国辉李曼张东东胡永岚
Owner BEIJING VISIONOX TECH
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