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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, improve external quantum efficiency, and improve light extraction efficiency Effect

Active Publication Date: 2021-07-20
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
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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 material of the electron transport layer is...

Embodiment 2

[0078] This embodiment provides an organic electroluminescence device, and the difference with the organic electroluminescence device in embodiment 1 is: the first reflector layer in the Bragg reflector layer 4 is SiNx (X takes 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% BUBD-1(30nm) / Bphen(20nm) / Mg:Ag(9:1, 20nm).

Embodiment 3

[0082] This embodiment provides an organic electroluminescence device, and the difference with the organic electroluminescence device in embodiment 1 is: the first reflector layer in the Bragg reflector layer 4 is SiNx (X takes 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% BUBD-1(30nm) / Bphen(20nm) / Mg:Ag(9:1, 20nm).

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Abstract

The invention discloses an organic electroluminescent device, which comprises a reflective electrode layer, a light-emitting layer and a transmissive electrode layer stacked in sequence, the reflective electrode layer includes a reflective metal layer, and a microcavity is formed between the reflective metal layer and the transmissive electrode layer to emit light. The distance d between the layer and the reflective metal layer complies with the formula I shown below: [{(2m+1) / 4}‑(1 / 8)]λ

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 Patents(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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