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Iridium complex, preparation method, application and organic electroluminescence device

A technology of iridium complexes and luminescence, which is applied in the direction of electric solid devices, electrical components, luminescent materials, etc., can solve the problems of efficiency reduction, efficiency roll-off, etc., and achieve the effects of excellent performance, excellent device performance, and high yield

Inactive Publication Date: 2017-06-30
安徽益瑞德新材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, in the current commonly used materials, the hole mobility of hole transport materials is much higher than that of electron transport materials, and the commonly used host materials are mainly hole transport, which will lead to a large number of redundant holes. Aggregation of holes at the interface between the light-emitting layer and the electron-transporting layer
These factors can lead to reduced efficiency and severe efficiency roll-off

Method used

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  • Iridium complex, preparation method, application and organic electroluminescence device
  • Iridium complex, preparation method, application and organic electroluminescence device
  • Iridium complex, preparation method, application and organic electroluminescence device

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preparation example Construction

[0041] The invention also discloses a preparation method of the iridium complex. This preparation method can prepare the above-mentioned iridium complex. Specifically, the preparation method includes the following steps:

[0042] Step S10: adding the ligand and iridium acetylacetonate into glycerol, heating and reacting, and then cooling to obtain a first solution.

[0043] Wherein, the ligand is a boron-containing quinazoline derivative.

[0044] Wherein, the molar ratio of the ligand to iridium acetylacetonate is 4:1-7:1, the heating reaction temperature is 220-240° C., the heating reaction time is 24-72 hours, and cooling to room temperature is sufficient.

[0045] Step S20: removing the solvent of the first solution, and extracting to obtain an organic phase.

[0046] Solvent removal can be achieved by distillation under reduced pressure. Extraction can be performed with dichloromethane. The organic phase can be concentrated.

[0047] Step S30: Separating the organic...

Embodiment 1

[0062] The iridium complex in Example 1 is

[0063] The preparation process of the iridium complex of Example 1 is as follows: the quinazoline ligand and iridium acetylacetonate with a molar ratio of 5:1 are dissolved in glycerol solution, heated to 240 ° C, reacted for 36 hours and cooled to room temperature to obtain the first solution. The first solution was distilled under reduced pressure to remove glycerin, then water and methylene chloride were added to the residue, and the liquid was separated to obtain an organic phase, which was concentrated and purified by column chromatography to obtain an iridium complex (yield: 37.6%). The response looks like this:

[0064]

[0065] Gained iridium complex is analyzed as follows by proton nuclear magnetic resonance spectrum and high-resolution mass spectrometry: 1 H NMR (400MHz, CDCl 3 )δ9.24(s, 1H), 7.91(d, J=12.0Hz, 6H), 7.86(s, 2H), 7.77(s, 3H), 7.51(s, 5H), 2.47(s, 3H). HRMS (ESI-TOF) calcd for C 81 h 60 B 3 IrN 6...

Embodiment 2

[0067] An organic electroluminescent device was prepared by using the iridium complex of Example 1 as a luminescent material.

[0068] The classic structure of an organic electroluminescent device is: a substrate, an anode, a hole transport layer, an organic electroluminescent layer, an electron transport layer, and a cathode are stacked in sequence.

[0069] The substrate in Example 2 is glass, the anode material is indium tin oxide (ITO), and the hole transport layer uses 4,4'-cyclohexyl bis[N,N-bis(4-methylphenyl)aniline (TAPC ). The structural formula of the TAPC is: The electron transport layer material uses 3,3'-(5'-(3-(pyridin-3-yl)phenyl)-[1,1':3',1"-triphenyl]-3,3"- diyl) dipyridine (TmPyPB). The structural formula of TmPyPB is: The thickness is 60nm, and the evaporation rate is 0.05nm / s. The cathode is LiF / Al, the thickness of LiF is 1nm, the evaporation rate is 0.01nm / s, the thickness of Al is 100nm, and the evaporation rate is 0.2nm / s. The organic electrolu...

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Abstract

The invention discloses an iridium complex. The structural formula of the iridium complex is shown in any one of formulas (1)-(4) in the specification, wherein R1-R15 are selected from at least one of H, alkyl, alkoxy and halogen. The invention further discloses a preparation method of the iridium complex, an application of the iridium complex in preparation of an organic electroluminescence device and the organic electroluminescence device. The iridium complex can be used as a luminescence center and can be applied to preparation of organic electroluminescence devices. The preparation method of the iridium complex is simple.

Description

technical field [0001] The invention relates to the technical field of organic electroluminescent materials, in particular to an iridium complex, a preparation method, an application and an organic electroluminescent device. Background technique [0002] Against the background of increasing global energy demand and worrying ecological environment, governments of various countries have vigorously developed sustainable energy-saving technologies and industries based on high technology. Organic electroluminescent devices (OLEDs) have attracted much attention because of their advantages such as wide viewing angle, high brightness, low energy consumption, and flexible devices, and are known as the key technology that will dominate the future display world. In recent years, a large number of studies have shown that among many complexes of heavy metal elements, iridium complexes are considered to be the most ideal choice of phosphorescent materials for OLEDs. with 5d 7 6s 2 The ...

Claims

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Application Information

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IPC IPC(8): C07F15/00C09K11/06H01L51/50H01L51/54
CPCC09K11/06C07F15/00C09K2211/185H10K85/342H10K50/00
Inventor 谢晨
Owner 安徽益瑞德新材料科技有限公司
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