Parallel white light organic electroluminescent device with six colors mixed and adjustable spectrum and its preparation method

An electroluminescent device, parallel technology, applied in the direction of electro-solid devices, semiconductor/solid-state device manufacturing, electrical components, etc., can solve the problems of white light device luminescence spectrum changes and other problems, achieve high efficiency, large half-peak width, and achieve display index Effect

Active Publication Date: 2020-02-21
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Different luminescent materials have different life spans, therefore, the brightness ratio of different materials will change under the same voltage over time, resulting in changes in the emission spectrum of white light devices

Method used

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  • Parallel white light organic electroluminescent device with six colors mixed and adjustable spectrum and its preparation method
  • Parallel white light organic electroluminescent device with six colors mixed and adjustable spectrum and its preparation method
  • Parallel white light organic electroluminescent device with six colors mixed and adjustable spectrum and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Clean the ITO first, dry it with nitrogen gas, and treat it with oxygen plasma for 2 minutes. In a vacuum of 1-5 x 10 -5 In Pa's coating system, MoO with a thickness of 8 nanometers is sequentially evaporated on the treated ITO electrode. 3 , 80 nm thick TAPC hole transport layer, 20 nm thick light emitting layer formed by six light emitting films, 40 nm PPT electron transport layer; and 1 nm LiF interface layer, and finally evaporated on LiF with discrete thickness 200nm metal Al electrode;

[0041] The combination of cycle units in the light-emitting layer is as follows: DSA-Ph doped with a weight ratio of 0.5% MADN, BCZ-TRZ with a weight ratio of 20% doped PPT, Ir(ppy) 3 Bepp doped at 6% by weight 2 , PO-01 Bepp doped with a weight ratio of 6% 2 , Ir(fbi)(acac) Bepp doped with 6% by weight 2 、Ir(bt) 2 Bepp doped at 6% by weight 2、 ;

[0042] MoO 3 , TAPC, MADN, Bepp 2 And the evaporation rate of PPT is controlled at 0.2 nanometers per second, DSA-Ph, BCZ-TR...

Embodiment 2

[0048] Clean the ITO first, dry it with nitrogen gas, and treat it with oxygen plasma for 2 minutes. In a vacuum of 1-5 x 10 -5 In Pa's coating system, MoO with a thickness of 8 nanometers is sequentially evaporated on the treated ITO electrode. 3 , 80 nm thick TAPC hole transport layer, 20 nm thick light emitting layer formed by six light emitting films, 40 nm PPT electron transport layer; and 1 nm LiF interface layer, and finally evaporated on LiF with discrete thickness 200nm metal Al electrode;

[0049] The combination of cycle units in the light-emitting layer is as follows: DSA-Ph doped with a weight ratio of 0.5% MADN, TCZ-TRZ with a weight ratio of 20% doped PPT, Ir(ppy) 3 Bepp doped at 6% by weight 2 , PO-01 Bepp doped with a weight ratio of 6% 2 , DCJTB Bepp doped with 1% by weight 2 、Ir(piq) 3 Bepp doped at 6% by weight 2 ;

[0050] MoO 3 , TAPC, MADN, Bepp 2 And PPT evaporation rate is controlled at 0.2 nanometers per second, DSA-Ph, TCZ-TRZ, Ir(ppy) 3 ,...

Embodiment 3

[0053] Clean the ITO first, dry it with nitrogen gas, and treat it with oxygen plasma for 2 minutes. In a vacuum of 1-5 x 10 -5 In Pa's coating system, MoO with a thickness of 8 nanometers is sequentially evaporated on the treated ITO electrode. 3 , 80 nm thick TAPC hole transport layer, 20 nm thick light emitting layer formed by six light emitting films, 40 nm PPT electron transport layer; and 1 nm LiF interface layer, and finally evaporated on LiF with discrete thickness 200nm metal Al electrode;

[0054] The combination of constituting the cycle unit in the light-emitting layer is as follows: DMAC-DPS is 30% by weight doped PPT, YDCZ-TRZ is 20% by weight doped PPT, Ir(ppy) 3 Bepp doped at 6% by weight 2 , PO-01 Bepp doped with a weight ratio of 6% 2 , DCJTB Bepp doped with 1% by weight 2 、Ir(piq) 3 Bepp doped at 6% by weight 2 ;

[0055] MoO 3 , TAPC, MADN, Bepp 2 And PPT evaporation rate is controlled at 0.2 nanometers per second, DMAC-DPS, YDCZ-TRZ, Ir(ppy) 3 ,...

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Abstract

The invention discloses a parallel-connected white light organic electroluminescence device with six colors intermixed and adjustable spectrum; the device comprises substrate / anode layer / hole injection layer / hole transport layer / light-emitting layer / electron transport layer / Electron injection layer / cathode layer stack structure; the light-emitting layer adopts the structure of six kinds of light-emitting thin films connected in parallel, the six kinds of thin films correspond to six kinds of light-emitting colors, the cathode layer can use separate strip electrodes, and each strip electrode corresponds to the light-emitting layer In a strip-shaped luminescent film, the cathode layer is divided into three groups and connected together to form three terminals, corresponding to red light, green light and blue light, and three independent controllers control the operating voltage of these three groups of light-emitting devices, so that it can be obtained different emission spectra. The prepared device is driven by a direct current voltage, and high-efficiency white light with a color rendering index suitable for various applications can be obtained. The invention can solve the problem that the spectrum of the traditional white light device changes with the increase of use time. The manufacturing process of the device is simple, the cost is low, and the power consumption is low.

Description

technical field [0001] The invention relates to a parallel-connected white light organic electroluminescent device with six colors mixed and adjustable in spectrum and a preparation method thereof. Background technique [0002] Organic electroluminescence is regarded as the hottest emerging technology in the flat panel display and lighting industry. Electroluminescence (Electroluminescence: EL) refers to the phenomenon that luminescent materials are excited by current and electric field to emit light under the action of electric field. It is a process of converting electrical energy into light energy. The study of organic electroluminescence began in the 1960s. In 1963, Pope et al. from New York University in the United States first realized electroluminescence on anthracene single crystals. In 1987, C.W.Tang and Van Slyke from EastmanKodak Company in the United States first used a new Sandwich structure, developed a low voltage (~10V), high brightness (1000cd / m 2 ), high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/50H01L51/56
CPCH10K50/125H10K71/00
Inventor 张其胜张智强邓超段科
Owner ZHEJIANG UNIV
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