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A green light organic electroluminescent device

An electroluminescence, electromechanical technology, applied in the field of green light organic electroluminescence devices, can solve the problem of low light extraction efficiency, and achieve the effects of high luminous efficiency, improved external quantum efficiency, and improved light extraction efficiency

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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  • A green light organic electroluminescent device
  • A green light organic electroluminescent device
  • A green light organic electroluminescent device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] This embodiment provides a green light 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 transpo...

Embodiment 2

[0078] This embodiment provides a green light organic electroluminescent device, which is different from the organic electroluminescent device in Embodiment 1 in that the first reflector layer in the Bragg reflector layer 4 is SiNx (X takes 1-2) SiNx The thickness d1=15nm, the refractive index η1=1.9.

[0079] The above-mentioned green organic light-emitting device complies with d*η=d1*η1+d2*η2+d3*η3+d4*η4+d5*η5=384nm, therefore, the thickness of the hole transport layer 52 d5=(384-1.9* 15-1.5*50-1.9*20-1.8*5) / 1.8=130nm.

[0080] The green organic electroluminescent device forms the following specific structure: ITO(20nm) / Ag(150nm) / SiNx(15nm) / SiO 2 (50nm) / ITO(20nm) / HAT(CN)6(5nm) / HTM081(130nm) / CBP:3%Ir(ppy)3(30nm) / Bphen(20nm) / Mg:Ag(9:1, 20nm ).

Embodiment 3

[0082] This embodiment provides a green light organic electroluminescent device, which is different from the organic electroluminescent device in Embodiment 1 in that the first reflector layer in the Bragg reflector layer 4 is SiNx (X takes 1-2) SiNx Thickness 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 green organic light-emitting device complies with d*η=d1*η1+d2*η2+d3*η3+d4*η4+d5*η5=384nm, therefore, the thickness of the hole transport layer 52 d5=(384-1.9* 15-2.2*50-1,76*20-1.8*5) / 1.8=110nm.

[0084] The green organic electroluminescent device forms the following specific structure: ITO(20nm) / Ag(150nm) / SiNx(15nm) / TiO 2 (50nm) / ITO(20nm) / HAT(CN)6(5nm) / HTM081(110nm) / CBP:3%Ir(ppy)3(30nm) / Bphen(20nm) / Mg:Ag(9:1, 20nm ).

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Abstract

The invention discloses a green light organic electroluminescence 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 , the distance d between the light-emitting layer and the reflective metal layer conforms to the following formula I: [{(2m+1) / 4}‑(1 / 8)]λ

Description

technical field [0001] The invention belongs to the field of display technology, and in particular relates to a green light 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/52
CPCH10K50/805H10K50/852H10K50/856
Inventor 汤金明吴彤
Owner NINGBO LUMILAN NEW MATERIAL CO LTD
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