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A High Efficiency/Color Quality/Color Stability Stacked White Organic Light Emitting Diode

A light-emitting diode and white light technology, which is applied in semiconductor/solid-state device manufacturing, semiconductor devices, electrical components, etc., can solve the problems of unfavorable device low cost, large-scale industrial production, complex device structure, and long preparation cycle, etc., and achieve good results. Effects of bipolar transmission performance, low device performance, and high color stability

Active Publication Date: 2021-07-02
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventionally, every time a light-emitting unit is added, the layer structure of the device will correspondingly increase by 5 to 10 layers or more. Such a stacked WOLED often contains 20 or more film layers, making the device structure very complicated and the production cycle long. , High preparation cost, not conducive to low-cost and large-scale industrial production of devices

Method used

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  • A High Efficiency/Color Quality/Color Stability Stacked White Organic Light Emitting Diode
  • A High Efficiency/Color Quality/Color Stability Stacked White Organic Light Emitting Diode
  • A High Efficiency/Color Quality/Color Stability Stacked White Organic Light Emitting Diode

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0095] During the preparation process of the device, the evaporation rate of the material and the thickness of the organic and inorganic film layers are monitored and controlled by a quartz crystal frequency meter connected outside the vacuum chamber. Among them, organic materials, MoO 3 The evaporation rates of LiF, LiF, and Al are about 1Å / s, 0.3Å / s, 0.1Å / s, and 3Å / s, respectively. The overlapping part of the ITO glass and the aluminum cathode is used as the effective light-emitting layer of the device, and the effective light-emitting area is 3mm×3mm.

[0096] The performance test method of the OLED device involved in the embodiment of the present invention is as follows.

[0097] The prepared OLED device was taken out from the vacuum cavity, and the parameters such as current density, brightness, current efficiency and power efficiency of the device were measured by using a computer-integrated control BM-70A photometer and a Keithley 2400 digital source meter; using a com...

Embodiment 1

[0101] LiF / Al / HAT-CN / HAT-CN:TAPC was selected as the charge generation unit to verify the crucial role of the charge generation unit in realizing the preparation of high-performance stacked WOLEDs.

[0102] First prepare a conventional blue light device B0 as a reference, device structure: ITO (180nm) / HAT-CN (5nm) / TAPC (40nm) / TCTA:TmPyPB(1:1):15wt% FIrpic (20nm) / TmPyPB (15nm) / TmPyPB:10wt% LiF (25nm) / LiF (1nm) / Al (100nm).

[0103] Then, the above-mentioned charge generation unit is used to connect two reference blue light devices as an electroluminescence unit, and a laminated blue light device B1 based on the above-mentioned charge generation unit is prepared, the device structure: ITO (180nm) / HAT-CN (5nm) / TAPC( 40nm) / TCTA:TmPyPB(1:1):15wt% FIrpic (20nm) / TmPyPB (15nm) / TmPyPB:10wt% LiF(25nm) / LiF (1nm) / Al (3nm) / HAT-CN (10nm) / HAT-CN:TAPC (2:1, 80nm) / TAPC(40nm) / TCTA:TmPyPB(1:1):15wt% FIrpic (20nm) / TmPyPB (15nm) / TmPyPB:10wt% LiF(25nm) / LiF ( 1nm) / Al (100nm).

[0...

Embodiment 2

[0109] In order to verify that the device structure of the sandwich body symmetric light-emitting layer structure can achieve high device efficiency and color stability, and to develop three-color and four-color high-color quality laminated WOLEDs in subsequent examples, this example prepared a sandwich-based symmetric WOLED. The yellow / blue / yellow, red / green / red and red / yellow / red symmetrical light-emitting layers of the light-emitting layer structure constitute single light-emitting unit two-color white light devices S1, S2 and S3.

[0110] Yellow / blue / yellow symmetrical light emitting layer device S1: ITO (180nm) / HAT-CN (5nm) / TAPC (40nm) / TCTA:6wt% Ir(BT) 2 (acac) (3nm) / TCTA:TmPyPB (1:1):15wt% FIrpic (15nm) / TmPyPB:6wt% Ir(BT) 2 (acac) (3nm) / TmPyPB (15nm) / TmPyPB:10wt% LiF (25nm) / LiF (1nm) / Al (100nm).

[0111] Red / green / red symmetrical light-emitting layer device S2: ITO (180nm) / HAT-CN (5nm) / TAPC (40nm) / TCTA:6wt% Ir(piq) 2 (acac) (3nm) / TCTA:Bepp 2 (1:1):8wt% Ir(ppy) ...

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Abstract

The invention relates to a stacked white light organic light emitting diode, which is composed of an anode, a first electroluminescent unit, a charge generating unit, a second electroluminescent unit and a cathode, the first electroluminescent unit and the second electroluminescent unit The light-emitting layer is a symmetrically doped sandwich light-emitting layer structure capable of emitting two colors. The colors of the light emitted by the first electroluminescent unit and the second electroluminescent unit are different, and the wavelength bands of the emitted light are complementary, and they are mixed to form a three-color or Four-color broad-spectrum white light emission. The stacked white organic light-emitting diode of the present invention realizes three-color or four-color high-efficiency, color quality and color stability white light emission only by connecting two electroluminescent units with a charge generation unit, and has a simple structure, easy preparation process, and easy industrialization. chemical production.

Description

technical field [0001] The invention belongs to the technical field of organic optoelectronic devices, and relates to organic light emitting devices, in particular to a white light organic light emitting diode based on a laminated structure. Background technique [0002] White organic light-emitting diode (WOLED) has the characteristics of self-illumination, surface light source, soft light color, sunlight-like, flexible, transparent, high efficiency and low cost. It is used in full-color flat panel display and large-area solid-state lighting. Due to its unique advantages, it has attracted extensive attention in scientific research and industry. [0003] In recent years, a lot of research has been carried out based on the characteristics of device efficiency, color quality, and color stability. A series of WOLEDs with new device structures have been developed and reported, and device performance has made great progress. For example, the external quantum efficiency of WOLEDs...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/50H01L51/56
CPCH10K50/131H10K71/00
Inventor 苗艳勤郭园园魏晓震高龙王华吴玉程许并社
Owner TAIYUAN UNIV OF TECH
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