Synthetic method for metallization of platinum carbene phosphorescent material

Abstract

The invention discloses a synthesis method for metallization of a platinum carbene phosphorescent material, which comprises the following steps: by using molecules with a boiling point of 120-250 DEGC and bidentate or polydentate coordination capacity as a solvent, adding a carbene-containing tridentate or tetradentate ligand and platinum metal salt into the solvent according to a molar ratio of(0.94)-0.97: 1 under the protection of alkali and inert gas, and reacting at 95-130 DEG C for 0.5-5.0 days, distilling under reduced pressure to remove the solvent, and separating and purifying by using a silica gel chromatographic column to obtain the metallized platinum carbene phosphorescent material, wherein the volume molar ratio of the solvent to the tridentate or tetradentate ligand containing carbene is 13-108: 1, and the equivalent ratio of the ligand to the alkali is 1: 3. The explosion risk caused by high pressure in the existing method is eliminated, and meanwhile, the reaction yield is also improved.

Description

technical field [0001] The invention belongs to the technical field of organic photoelectric materials, and in particular relates to a metallization synthesis method of a platinum carbene phosphorescent material. Background technique [0002] Organic light-emitting diodes (OLEDs) are also called organic light-emitting devices (Organic Light-Emitting Device) or organic electroluminescent devices (Organic Electroluminescent Device). Organic electroluminescence refers to a luminescence phenomenon in which small organic molecules, metal-organic complex molecules or polymer molecular light-emitting materials directly convert electrical energy into light energy under the action of a forward bias electric field. OLED is self-luminous, without backlight, and energy-saving; it also has the characteristics of fast response, low driving voltage, high luminous efficiency and resolution, wide viewing angle, high contrast; in addition, it can use cheap glass, metal or even flexible plasti...

AI Technical Summary

Problems solved by technology

However, in the synthesis of such cyclometal platinum complex phosphorescent materials containing carbene ligands, there have always been some problems, especially in the final critical step - the metallation of the ligands.

First, the reaction yield is low, generally about 20%, which will lead to a large consumption of precious ligands and noble metal salts, and high cost; second, the reaction requires a high-temperature sealed tube reaction system, and there is a risk of explosion! After a lot of experimental exploration and optimization, the researchers found that tetrahydrofuran (THF) is an excellent solvent for this kind of ligand metallation reaction, and it is also the solvent used in the synthesis methods reported so far. The target material molecule can be obtained by heating the reaction at 120°C.

But tetrahydrofuran has a low boiling point (66°C), so it needs to be heated to 120°C under sealed conditions, which will cause the pressure inside the reaction system to increase greatly, and there is a risk of explosion! The occurrence of a reaction explosion accident will not only cause the failure of the reaction and the waste of precious raw materials, but more importantly, it will pose a major threat to the personal safety of the experimenters.

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