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Blue phosphorescence iridium metal complex, preparation method and organic electroluminescent device

A technology of iridium metal complexes and blue phosphorescence, which is applied in the fields of electric solid-state devices, organic chemistry, and luminescent materials, can solve the problems of lagging development and poor luminous performance of light-emitting devices, and achieve increased luminous intensity, improved luminous performance, and improved The effect of luminous properties

Inactive Publication Date: 2014-12-03
OCEANS KING LIGHTING SCI&TECH CO LTD +2
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  • Description
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AI Technical Summary

Problems solved by technology

Compared with red light and green light materials, the development of blue light materials is relatively lagging behind. Improving the efficiency and color purity of blue light materials has become the breakthrough point of people's research. There are bottleneck problems in terms of efficiency and device efficiency attenuation, which makes the luminous performance of organic electroluminescent devices poor

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  • Blue phosphorescence iridium metal complex, preparation method and organic electroluminescent device
  • Blue phosphorescence iridium metal complex, preparation method and organic electroluminescent device
  • Blue phosphorescence iridium metal complex, preparation method and organic electroluminescent device

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preparation example Construction

[0065] The preparation method of the blue phosphorescent iridium metal complex has mild reaction conditions, low equipment requirements, low preparation cost, and easy large-scale preparation.

[0066] See figure 2 , The organic electroluminescent device 300 of an embodiment includes a substrate 301, an anode 302, a hole injection layer 303, a hole transport layer 304, an electron blocking layer 305, a light emitting layer 306, a hole blocking layer 307, and electrons which are sequentially stacked. The transport layer 308, the electron injection buffer layer 309 and the cathode 310.

[0067] The materials of the substrate 301, the anode 302, the hole injection layer 303, the hole transport layer 304, the electron blocking layer 305, the hole blocking layer 307, the electron transport layer 308, the electron injection buffer layer 309, and the cathode 310 are commonly used in the field. material. For example, the substrate 101 is a glass substrate, the material of the anode 302 i...

Embodiment 1

[0072] Blue phosphorescent bis(2-(4',6'-difluorophenyl)-5-methoxypyrimidine-N,C 2' ) Synthesis of (2,4-bis(trifluoromethyl)-5-(pyridine-2'-yl)pyrrole) iridium complex.

[0073] Blue phosphorescent bis(2-(4',6'-difluorophenyl)-5-methoxypyrimidine-N,C 2' The structural formula of (2,4-bis(trifluoromethyl)-5-(pyridine-2'-yl)pyrrole) iridium complex is as follows:

[0074]

[0075] (1) Synthesis of 2-(2',4'-difluorophenyl)-5-methoxypyrimidine

[0076] In a nitrogen atmosphere, 1.89g (10mmol) 2-bromo-5-methoxypyrimidine, 1.89g (12mmol) 2,4-difluorophenylboronic acid and 0.58g (0.5mmol) tetrakis (triphenylphosphorus) Palladium was dissolved in 35 mL of toluene, and then 15 mL of an aqueous solution containing 2.76 g (20 mmol) of potassium carbonate was added dropwise to the reaction system. Heating, stirring and reacting at 90°C for 10h. After the reaction is over, after the reaction solution is cooled to room temperature, extract with dichloromethane, take the organic phase, wash with w...

Embodiment 2

[0102] Blue phosphorescent bis(2-(4',6'-difluorophenyl)-5-hexoxypyrimidine-N,C 2' ) Synthesis of (2,4-bis(trifluoromethyl)-5-(pyridine-2'-yl)pyrrole) iridium complex.

[0103] Blue phosphorescent bis(2-(4',6'-difluorophenyl)-5-hexoxypyrimidine-N,C 2' The structural formula of (2,4-bis(trifluoromethyl)-5-(pyridine-2'-yl)pyrrole) iridium complex is as follows:

[0104]

[0105] (1) Synthesis of 2-(2',4'-difluorophenyl)-4-hexoxypyrimidine

[0106] In an argon atmosphere, 1.30g (5mmol) 2-bromo-4-hexoxypyrimidine, 0.79g (5mmol) 2,4-difluorophenylboronic acid and 0.14g (0.2mmol) dichlorobis(triphenyl) Phosphorus) palladium was dissolved in 30 mL of DMF, and then 15 mL of an aqueous solution containing 2.07 g (15 mmol) of potassium carbonate was added dropwise to the reaction system. Heat, stir and react under reflux at 80°C for 12 hours. The reaction is over. After the reaction solution is cooled to room temperature, extract with dichloromethane, take the organic phase, wash with water un...

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Abstract

The invention relates to a blue phosphorescence iridium metal complex, its preparation method and an organic electroluminescent device. The structural formula of the blue phosphorescence iridium metal complex is as defined in the specification, wherein R is an alkoxyl group with carbon atom number being 1-20. According to the blue phosphorescence iridium metal complex, 2-(4',6'-difluorophenyl)pyrimidine is used as a cyclometallated ligand main-structure, and 2,4-di(trifluoromethyl)-5-(pyridine-2'-yl)pyrrole is used as an auxiliary ligand. With the introduction of two F groups at 4,6- sites of benzene ring of 2-(4',6'-difluorophenyl)pyrimidine and a high-field-intensity auxiliary ligand 2,4-di(trifluoromethyl)-5-(pyridine-2'-yl)pyrrole, blue shift of emission wavelength can be realized effectively, and blue ray with high color purity can be emitted to obtain satisfactory blue ray. In addition, luminescence property also can be improved and luminescence intensity can be enhanced. With the application of the blue phosphorescence iridium metal complex in the organic electroluminescent device, luminescence property of the organic electroluminescent device can be raised.

Description

Technical field [0001] The invention relates to the technical field of electroluminescent materials, in particular to a blue phosphorescent iridium metal complex, a preparation method thereof and an organic electroluminescent device. Background technique [0002] Organic electroluminescence refers to a luminescence phenomenon in which organic materials directly convert electrical energy into light energy under the action of an electric field. In the early days, the research on organic electroluminescence was stagnated due to the high driving voltage and low luminous efficiency of organic electroluminescence devices. Until 1987, Tang et al. of Kodak in the United States invented the use of 8-hydroxyquinoline aluminum (Alq 3 ) Is a luminescent material, which is made into a uniform and dense high-quality thin film with aromatic diamine to produce an organic electroluminescent device with low working voltage, high brightness and high efficiency, which opens a new prelude to the rese...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/06C07F15/00H01L51/54
Inventor 周明杰王平张娟娟钟铁涛
Owner OCEANS KING LIGHTING SCI&TECH CO LTD
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