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White light organic electroluminescent device and preparation method of white light organic electroluminescent device

An electroluminescent device, white light technology, applied in the fields of electro-solid devices, chemical instruments and methods, semiconductor/solid-state device manufacturing, etc. Good and efficient effect

Inactive Publication Date: 2012-10-03
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above-mentioned devices and their methods still have disadvantages such as complex preparation process, high cost, poor stability of luminous color to voltage, and impure luminous chromaticity. Therefore, it is urgent to develop a new type of white light organic photoelectric Luminescent devices

Method used

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  • White light organic electroluminescent device and preparation method of white light organic electroluminescent device
  • White light organic electroluminescent device and preparation method of white light organic electroluminescent device
  • White light organic electroluminescent device and preparation method of white light organic electroluminescent device

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Experimental program
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Embodiment 1

[0037] Iridium complexes of phenylquinoline ligands (BDHBA) 2 Ir (acac) and preparation thereof, comprises the following steps:

[0038] 1) Preparation of phenylquinoline ligands

[0039] Add 26.0g of zinc powder and 200mL of anhydrous THF into a 500mL three-necked flask, under nitrogen protection, stir at room temperature, and slowly add 22mL of TiCl 4 , Heated to reflux for 3h, cooled to room temperature to obtain black low-valent titanium reagent.

[0040] Dissolve 15mL of concentrated sulfuric acid and 41.4g of 5-tert-butoxy-2-nitrobenzaldehyde in 400mL of glacial acetic acid, cool down to 0°C, slowly add 29.2g of tetralone dropwise, react at room temperature for 3 hours, and stop the reaction. Stand still for 48 hours, filter, and recrystallize the filter cake with 90% ethanol to obtain the intermediate product (3).

[0041] The intermediate product (3) dissolved in 200mL THF was slowly added dropwise to the low-valent titanium reagent, and reacted overnight at room temp...

Embodiment 2

[0048] Reference attached figure 2 , according to the first white electroluminescent device of the present invention has the following structure:

[0049] ITO / NPB / TCTA / FIrPic:CzSi / (BDHBA) 2 Ir(acac):CBP / TAZ / LiF / Al

[0050] at 10 -4 Under the vacuum degree of Pa, the material is evaporated on a resistance of 10Ωsquare by vacuum evaporation method. -1 Made of ITO glass. Wherein the hole transport layer of the device is followed by NPB (film thickness is 30nm), TCTA (film thickness is 20nm); double light-emitting layer is followed by FIrPic:CzSi layer (doping concentration is 7%, film thickness is 20nm) and (BDHBA ) 2 Ir(acac): CBP layer (doping concentration is 5%, film thickness is 100nm); electron transport layer is TAZ (film thickness is 50nm); electron injection layer is LiF (film thickness is 1nm); cathode is Al (100nm ); the evaporation rate of organic materials is 0.1~0.2nm s -1 , the cathode LiF evaporation rate is 0.01nm s -1 , the evaporation rate of Al is 0.1...

Embodiment 3

[0053] Reference attached image 3 , according to the second white electroluminescent device of the present invention is the following structure:

[0054] ITO / NPB / TCTA / (BDHBA) 2 Ir(acac):CBP / FIrPic:CzSi / (BDHBA) 2 Ir(acac):CBP / TAZ / LiF / Al

[0055] at 10 -4 Under the vacuum degree of Pa, the material is evaporated on a resistance of 10Ωsquare by vacuum evaporation method. -1 Made of ITO glass. Among them, the hole transport layer of the device is NPB (film thickness is 30nm), TCTA (film thickness is 20nm); the three light-emitting layers are (BDHBA) 2 Ir(acac):CBP layer (doping concentration is 4%, film thickness is 3nm), FIrPic:CzSi layer (doping concentration is 9%, film thickness is 20nm) and (BDHBA) 2 Ir(acac): CBP layer (doping concentration is 3%, film thickness is 10nm); electron transport layer is TAZ (film thickness is 50nm); electron injection layer is LiF (film thickness is 1nm); cathode is Al (100nm ); the evaporation rate of organic materials is 0.1~0.2nm s -...

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Abstract

The invention belongs to the technical field of novel electrophosphorescence luminescent materials and discloses a white light organic electroluminescent device utilizing iridium complex excimers for luminescence. The white light organic electroluminescent device comprises ITO (indium tin oxide) conducting glass, a hole transport layer, a composite luminous layer, an electronic transmission layer, an electronic injection layer and a negative electrode, wherein the composite luminous layer is a double luminescent layer or a tri-luminescent layer formed by co-doping blue light phosphorescence materials FIrPic and iridium complexes (BDHBA)2Ir(acac) of phenychinoline ligand. According to a preparation method, at the vacuum degree of 10<-4>Pa, the material is evaporated on the ITO glass with the resistance being 10 Omega square<-1> by a vacuum evaporation method, and the white light organic electroluminescent device is formed. The white light organic electroluminescent device has the advantages of good color stability, higher device brightness and higher efficiency and is suitable for being applied to organic luminescent display.

Description

technical field [0001] The invention belongs to the technical field of novel electrophosphorescent luminescent materials, and in particular relates to a high-efficiency white light organic electroluminescence device and a preparation method thereof which utilize iridium complex excimer associations to emit light. Background technique [0002] Organic light-emitting diodes (OLEDs) have the advantages of high brightness, light weight, and low power consumption, and have become a hot spot in the field of material research in recent years. In order to realize full-color display and as a back-projection light source for digital products such as notebook computers, research work on white organic electroluminescent devices has been extensively carried out. In 1993, Kido and other scientists prepared a white light organic electroluminescent device doped with three fluorescent materials and a multilayer structure: ITO / PVK:TPB, Coumarin 6, DCM-1 / TAZ / A1Q / Mg:Ag. After that, Granstrom's...

Claims

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Application Information

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IPC IPC(8): H01L51/54H01L51/50H01L51/56C07F15/00C09K11/06
CPCY02B20/181Y02B20/00
Inventor 孙培培张光辉肖亚平王元元
Owner NANJING NORMAL UNIVERSITY