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Metal complex and organic electroluminescent device

A metal complex, metal technology, applied in the direction of electric solid devices, electrical components, luminescent materials, etc., can solve the problems of reducing the quantum yield and molecular stability of the phosphorescent system, poor color purity, and aggravating the quenching of phosphors.

Active Publication Date: 2019-06-28
SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, red and green phosphorescent materials still have the problems of low luminous quantum efficiency and poor color purity.
The main reason for this situation is that phosphorescence comes from transitions between energy levels with narrow energy gaps, and heavy metal complexes with narrow band gaps have certain difficulties in ligand design. Strong π-π bond interaction, strong charge transfer characteristics between ligands, so that there are more non-radiative relaxation channels in the narrow bandgap, which intensifies the quenching of phosphors and reduces the phosphorescent system. Quantum yield and molecular stability

Method used

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  • Metal complex and organic electroluminescent device
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  • Metal complex and organic electroluminescent device

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preparation example Construction

[0110] The metal complex of the present invention is prepared by using the modified aryl ketone as a raw material and undergoing preparation processes such as ring closure and coordination under suitable conditions. The simple organic preparations involved in the preparation of the metal complexes of the present invention are not described in detail in the present invention.

[0111] [Organic Electroluminescent Materials]

[0112] The organic electroluminescent material of the present invention contains one or more of the metal complexes of the present invention. The organic electroluminescent material of the present invention may consist of only one or more of the metal complexes of the present invention, or may contain other materials other than the metal complexes of the present invention.

[0113] The metal complex of the present invention is also included in the scope of the present invention as a luminescent material alone or as a dopant material in a luminescent materi...

Embodiment 1

[0139] Preparation of compound LA2:

[0140] The preparation method of ligand LA2 comprises the following steps:

[0141] The first step: preparation of compound Int-1

[0142]

[0143] 61.5g (0.11mol) of 2-iodobenzyltriphenylphosphonium salt was dispersed in 350mL of anhydrous THF. Under nitrogen protection, the temperature was lowered to 0°C with an ice-salt bath, and 14.8g (0.13mmol) of t- Potassium butoxide, after stirring and reacting for 30 minutes, add 20.0g (0.1mol) of 2-bromo-5-methylbenzaldehyde dropwise, after the addition, keep stirring and react for 1 hour, rise to room temperature and stir for 24 hours, add 150mL Saturated ammonium chloride aqueous solution, extracted with ethyl acetate, the organic phase was dried with anhydrous sodium sulfate, filtered, concentrated under reduced pressure to dryness, separated and purified by silica gel column to obtain 36.7g of yellow oil, which was a cis / trans mixture, and the yield : 92%.

[0144] The second step: the ...

Embodiment 2

[0154] Preparation of Compound LA143:

[0155] In the single-port reaction flask, drop 5.0g (18.5mmol) of LA2, add 20mL of deuterated ethanol, then add 6.4g (93.0mmol) of sodium ethylate, heat up and reflux for 48 hours, cool to room temperature, and concentrate to dryness under reduced pressure. Separation and purification with a silica gel column yielded 4.8 g of compound LA143 as a yellow solid.

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Abstract

The invention discloses a metal complex and an organic electroluminescent device including the metal complex. The molecular formula of the metal complex is M(LA)x(LB)y. The organic electroluminescentdevice including the metal complex is high in light-emitting efficiency, the thermal stability of the metal complex is high, and the metal complex is easy to prepare and purify and is an ideal choiceas a light-emitting material of the organic electroluminescent device.

Description

technical field [0001] The invention relates to the technical field of organic electroluminescence. More specifically, it relates to a metal complex for organic electroluminescence, and an organic electroluminescence device comprising the metal complex. Background technique [0002] Organic electroluminescence (referred to as OLED) and related research As early as 1963, pope et al. first discovered the electroluminescence phenomenon of organic compound single crystal anthracene. In 1987, Kodak Corporation of the United States made an amorphous film device by evaporating organic small molecules, which reduced the driving voltage to less than 20V. This type of device is ultra-thin, fully cured, self-illuminating, high brightness, wide viewing angle, fast response speed, low driving voltage, low power consumption, bright color, high contrast, simple process, good temperature characteristics, and can realize flexible display. And other advantages, can be widely used in flat pa...

Claims

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Application Information

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IPC IPC(8): C07F15/00C09K11/06H01L51/50H01L51/54
Inventor 曹建华郭剑邵哲纪秦思贾敏慧何伟壮
Owner SHIJIAZHUANG CHENGZHI YONGHUA DISPLAY MATERIALS CO LTD
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