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An organic electroluminescent device

An electroluminescent device and luminescence technology, which is applied in the direction of electric solid-state devices, electrical components, semiconductor devices, etc., can solve the problems of low light extraction efficiency, achieve high luminous efficiency, high reflectivity, and improve the effect of light extraction efficiency

Active Publication Date: 2018-12-14
NINGBO LUMILAN NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defects of low light extraction efficiency in organic electroluminescent devices in the prior art.

Method used

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  • An organic electroluminescent device
  • An organic electroluminescent device
  • An organic electroluminescent device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] This embodiment provides an organic electroluminescent device, such as figure 1 As shown, it includes a reflective electrode layer 1 , a second carrier functional layer 6 , a light emitting layer 2 , a first carrier functional layer 5 and a reflective electrode layer 3 which are stacked sequentially from top to bottom. Wherein, the reflective electrode layer 3 includes a reflective metal layer 32 and a transparent electrode layer 31, the Bragg reflector layer 4 is arranged on the upper surface of the reflective metal layer 32, and the upper surface of the Bragg reflector layer 4 and the lower surface of the reflective metal layer 32 are respectively A transparent electrode layer 31 is provided.

[0051] The reflective electrode layer 1 is a translucent cathode layer, which is an alloy layer formed by mixing Mg and Ag at a mass ratio of 9:1.

[0052] The second carrier functional layer 6 is an electron transport layer, and the electron transport layer material is select...

Embodiment 2

[0078] The present embodiment provides a kind of organic electroluminescent device, and the difference with the organic electroluminescent device in embodiment 1 is: the first mirror layer in the Bragg reflector layer 4 is SiNx (X gets 1-2) the thickness of SiNx d1=15nm, refractive index η1=1.9.

[0079] The above-mentioned organic light-emitting device complies with d*η=d1*η1+d2*η2+d3*η3+d4*η4+d5*η5=351 nm, therefore, the thickness d5 of the hole transport layer 52=(351-1.9*15- 1.5*50-2*20-1.9*5) / 1.9=104nm.

[0080] The organic electroluminescent device forms the following specific structure: ITO(20nm) / Ag(150nm) / SiNx (15nm) / SiO 2 (50nm) / ITO(20nm) / HAT(CN)6(5nm) / HTM081(104nm) / AND:5%B UBD-1(30nm) / Bphen(20nm) / Mg:Ag(9:1, 20nm) .

Embodiment 3

[0082] The present embodiment provides a kind of organic electroluminescent device, and the difference with the organic electroluminescent device in embodiment 1 is: the first mirror layer in the Bragg reflector layer 4 is SiNx (X gets 1-2) the thickness of SiNx d1=15nm, refractive index η1=1.9; the second mirror layer in the Bragg mirror layer 4 is TiO 2 ,TiO 2 The thickness d2=50nm, the refractive index η2=2.2.

[0083] The above-mentioned organic light-emitting device complies with d*η=d1*η1+d2*η2+d3*η3+d4*η4+d5*η5=351 nm, therefore, the thickness d5 of the hole transport layer 52=(351-1.9*15- 2.2*50-2*20-1.9*5) / 1.9=86nm.

[0084] The organic electroluminescent device forms the following specific structure: ITO(20nm) / Ag(150nm) / SiNx (15nm) / TiO 2 (50nm) / ITO(20nm) / HAT(CN)6(5nm) / HTM081(86nm) / AND:5%B UBD-1(30nm) / Bphen(20nm) / Mg:Ag(9:1, 20nm) .

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Abstract

An organic electroluminescent device disclosed in the invention comprises a reflective electrode layer, a light emitting layer and a transmission electrode layer, wherein the reflective electrode layer comprises a reflective metal layer, a microcavity is formed between the reflective metal layer and the transmission electrode layer, and the distance d between the light emitting layer and the reflection metal layer conforms to the following formula I: [{(2m +1) / 4}- (1 / 8)]Lambda(Etad([ {(2m+1) / 4} + (1 / 8)]Lambda. Fabry-Perot microcavity enhances is formed between that reflective metal layer and the transmissive electrode layer. the selectivity of the light emitted by the device with Lambda wavelength, and improves the light extraction efficiency of the device. The resonance wave is generatedby the light wave in the micro cavity. By setting the distance between the light emitting layer and the reflecting metal layer with formula I, the light emitting layer is located at the wavefront position of the resonance wave, which effectively improves the luminous intensity of the device and further realizes the high-efficiency luminescence of the device.

Description

technical field [0001] The invention belongs to the field of display technology, and in particular relates to an organic electroluminescent device. Background technique [0002] In the field of flat-panel display, organic light-emitting diodes (OLEDs, Organic Light Emitting Diods) are the development trend of the next generation of display and lighting due to their advantages such as wide viewing angle, ultra-thin, fast response, high brightness, and flexible display. One of the most promising display technologies. [0003] The external quantum efficiency of OLED devices is mainly affected by two factors: one is the internal quantum efficiency of OLED devices, and the other is the light extraction efficiency of OLED devices. Recently, OLED devices have made positive progress in improving the internal quantum efficiency of the device. The application of phosphorescent materials has increased the internal quantum efficiency of organic electrophosphorescent devices from 25% to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/52
CPCH10K50/805H10K50/85H10K50/856
Inventor 汤金明吴彤
Owner NINGBO LUMILAN NEW MATERIAL CO LTD
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