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Ir(III) complex, preparation method thereof and electroluminescent device prepared from Ir(III) complex

A technology of electroluminescent devices and complexes, which is applied in the direction of electric solid devices, electrical components, luminescent materials, etc., can solve the problems of complex process, prone to color difference, high price, etc., achieve good luminous stability, improve luminous brightness, Stable and reproducible results

Inactive Publication Date: 2014-11-12
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the method of doping red and green organic electroluminescent materials is generally used to make yellow LEDs. The process is complicated, the price is expensive, and problems such as color difference are prone to occur.

Method used

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  • Ir(III) complex, preparation method thereof and electroluminescent device prepared from Ir(III) complex
  • Ir(III) complex, preparation method thereof and electroluminescent device prepared from Ir(III) complex
  • Ir(III) complex, preparation method thereof and electroluminescent device prepared from Ir(III) complex

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Example 1 Preparation of Ir(III) complexes

[0050] 1. Preparation of MBImB-Cz ligand:

[0051] (1) Preparation of Br-Cz: Add 12 mmol carbazole, 160 mg tetrabutylammonium bromide, 5.5 ml 1,6-dibromohexane, and 6 ml benzene into the reaction flask, and react for 0.5 h under ice-water bath conditions. Then 1 g of 50% sodium hydroxide solution was added dropwise, reacted for 2 h under ice-water bath conditions, and then returned to room temperature naturally for 48 h. The product was dissolved in 20 ml of dichloromethane, the organic phase was washed with distilled water, and dried over anhydrous magnesium sulfate to obtain a crude product. The crude product was firstly purified by silica gel column chromatography using petroleum ether and then a mixed solution of petroleum ether: ethyl acetate = 10:1 as eluent. The product Br-Cz was obtained as white massive crystals with a yield of 2.38 g (yield 60%). The test data of gained Br-Cz is as follows: 1 H NMR (300 MHz, CDC...

Embodiment 2

[0058] The Ir(III) complex prepared in Example 1 was subjected to a photoluminescence test (using EDINBURGH FLS920 fluorescence instrument, the excitation wavelength was 450 nm), and the test results were as follows figure 1 shown. Photoluminescence tests show that the complex with the structure of formula (I) emits bright yellow light in the wavelength range of 520-650 nm.

Embodiment 3

[0059] Example 3 Preparation of electroluminescent device

[0060] (1) Preparation of the EML layer: the above-mentioned Ir(III) complex material MBImB-Cz-Ir-ppy was dissolved in chloroform, and mixed with PVK and PBD solutions dissolved in chlorobenzene (mass ratio PVK:PBD:Ir(III ) complex = 100: 40: X, X takes 1, 2, 4 or 8) as the light-emitting layer (EML).

[0061] (2) Preparation of multilayer electroluminescent devices: The emissive layer (EML) prepared in step (1) is spin-coated, and the other layers are evaporated, and the structure is prepared on an ITO glass substrate as ITO / PEDOT: Electroluminescent device of PSS (40 nm) / EML (80 nm) / CsF (1.5 nm) / Al (100 nm).

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Abstract

The invention discloses an Ir(III) complex. A cation part of the Ir(III) complex is MBImB-Cz-Ir-polypyrrole (ppy), and has a structure shown as a formula (I). A method for preparing the Ir(III) complex comprises the following steps of: reacting a MBImB-Cz ligand with IrCl3 to obtain an intermediate [Ir(MBImB-Cz)Cl2]2, and reacting the intermediate with a ppy ligand further to obtain a target product MBImB-Cz-Ir-ppy. The Ir(III) complex can be used as a luminous layer to prepare an electroluminescent device. Photoluminescent tests indicate that the Ir(III) complex with the structure of the formula (I) emits bright yellow light with the waveband ranging from 520 to 650 nanometers, and is high in luminous efficiency, stability and reproducibility. The prepared yellow light electroluminescent device has the advantages of high brightness, efficiency and luminous stability and pure light colors, and a white light electroluminescent device is obtained easily by compounding the Ir(III) complex and a blue light material. The Ir(III) complex has a good application prospect in the field of light-emitting diodes (LEDs).

Description

technical field [0001] The invention belongs to the field of luminescent materials, and in particular relates to an Ir(III) complex, a preparation method thereof and an electroluminescent device prepared therefrom. Background technique [0002] Since the light-emitting diode (Light Emitting Diodes, LEDs) electroluminescent device was born in the late 1980s, after decades of development, it has shown unique performance advantages in lighting and flat panel display applications, and has become more and more popular at home and abroad. Wide attention from research institutes and companies. The performance of LEDs is gradually improving, and LED products have entered the flat panel display market. However, there are still some problems in its research and application, for example, the device efficiency is still relatively low, and the light-emitting wavelength band needs to be expanded and adjusted. In order to further improve the performance of LED devices, people are constan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F15/00C09K11/06H01L51/54H01L51/56
Inventor 潘梅傅雷吴宏滨李艳虎严诚魏世超李康王子王海平苏成勇
Owner SUN YAT SEN UNIV