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Organic electroluminescent device

An electroluminescence device and a luminescence technology, applied in the direction of electric solid-state devices, electrical components, semiconductor devices, etc., can solve the problems of insufficient energy utilization and high voltage

Active 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 above problems of insufficient energy utilization and high voltage, the present invention further proposes a dual-host material doped fluorescent dye solution consisting of two thermally activated delayed fluorescence (TADF) materials

Method used

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  • Organic electroluminescent device
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  • Organic electroluminescent device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0330] The organic electroluminescence device structure of the present embodiment is as follows:

[0331] ITO / MTDATA:4%F4TCNQ(100nm) / NPB(20nm) / Host(compound 2-3):30%Host(compound 1-16):1%rubrene(30nm) / Alq3(30nm) / LiF(1nm) / Al(150nm)

[0332] The light-emitting layer of this embodiment adopts two kinds of TADF materials as light-emitting hosts (the first host Host (compound 2-3) and the second host Host (compound 1-16), and Host (compound 1-16) accounts for 30% of the mass of the light-emitting layer. %, the difference between the two band gaps >0.2eV), using a fluorescent material rubrene as a dye (accounting for 1% of the mass of the light-emitting layer). Wherein, the photoluminescence spectrum of the second host material is basically consistent with the absorption spectrum of the fluorescent dye, and after highly normalized, the wavelength difference corresponding to the peak is within 50 nm.

Embodiment 2

[0334] The organic electroluminescence device structure of the present embodiment is as follows:

[0335] ITO / MTDATA:4%F4TCNQ(100nm) / NPB(20nm) / Host(Compound 2-3):30%Host(Compound 1-16):1% Dopant(Compound 2-16)(30nm) / Alq3(30nm) ) / LiF(1nm) / Al(150nm)

[0336] The light-emitting layer of this embodiment adopts two kinds of TADF materials as light-emitting hosts (the first host Host (compound 2-3) and the second host Host (compound 1-16), and Host (compound 1-16) accounts for 30% of the mass of the light-emitting layer. %), using a heat-activated delayed fluorescent material Dopant (compound 2-16) as a dye (accounting for 30% of the mass of the light-emitting layer). Wherein, the photoluminescence spectrum of the second host material is basically consistent with the absorption spectrum of the fluorescent dye, and after highly normalized, the wavelength difference corresponding to the peak is within 50 nm.

[0337]

[0338] 2-16

[0339] The experimental data of above-mentione...

Embodiment 3

[0349] The organic electroluminescence device structure of the present embodiment is as follows:

[0350] ITO / MTDATA:4%F4TCNQ(100nm) / NPB(20nm) / Host(2-8):30%Host (2-16):1%DCM (30nm) / Alq3(30nm) / LiF(1nm) / Al (150nm)

[0351] The light-emitting layer of this embodiment uses two kinds of TADF materials as light-emitting hosts (the first host Host (2-8) and the second host Host (2-16), Host (2-16) accounts for 30% of the mass of the light-emitting layer, and the second host Host (2-16) accounts for 30% of the mass of the light-emitting layer. The difference between the forbidden band width of those >0.2eV)), a fluorescent material DCM is used as the dye (accounting for 1% of the mass of the light-emitting layer). Wherein, the photoluminescence spectrum of the second host material is basically consistent with the absorption spectrum of the fluorescent dye, and after highly normalized, the wavelength difference corresponding to the peak is within 50 nm.

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Abstract

The invention discloses an organic electroluminescent device. The organic electroluminescent device comprises a light emitting layer and is characterized in that a main body material of the light emitting layer comprises a first main body material and a second main body material, the first main body material and the second main body material are both thermal active delay fluorescent materials, the main body materials are doped with fluorescent dyes, the difference between forbidden bandwidth of the first main body material and the forbidden bandwidth of the second main body material is larger than 0.2eV, and the difference between wavelengths corresponding to peaks is within 50 nanometers after photoluminescence spectrum of the second main body material and absorption spectrums of the fluorescent dyes are highly normalized. More rapid energy transmission to the fluorescent dyes from a singlet state of the light emitting layer of the organic electroluminescent device is achieved, thus, energy transmission to the singlet state from a triplet state of a main body is promoted, high quantum efficiency is acquired, and the efficiency reduction trend is slow with increase of a current.

Description

Technical field [0001] The present invention is the field of mechanical electrical lighting device, which is specific to a fluorescent mechanical electrical optical device containing a new type of main material. Background technique [0002] During the electromagnetic lighting process of the mechanical and electrical luminous devices, it mainly depends on the light transition from the inspiration state to the basal state of the radiation layer.At room temperature, the light emitting generated from the electronic transition from the three -line stimulus to the base state is extremely weak. Most of the energy is lost in the form of heat.Lay fluorescence.Because the probability of three -line stimulus is three times the single -line stimulus, it is equivalent to 75%of the energy.Making full use of this energy will effectively improve the luminous efficiency of organic electrical light -to -light devices. [0003] In order to make full use of the energy of the main material of the li...

Claims

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Application Information

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IPC IPC(8): H01L51/54H01L51/50
Inventor 段炼张东东张国辉李曼董艳波胡永岚
Owner BEIJING VISIONOX TECH
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