Blue light TADF material, preparation method thereof and electroluminescent device
AssigneeWuhan China Star Optoelectronics Semiconductor Display Technology Co., Ltd.
InventorJiajia Luo
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Abstract
The present invention provides a blue light thermally activated delayed fluorescence (TADF) material, a preparation method thereof, and an electroluminescent device. The blue TADF material achieves high luminous efficiency and TADF efficiency to realize excellent solubility by attaching an alkyl chain for increasing solubility to a periphery of the blue light TADF material, and by attaching a tert-butylcarbazole unit having a high energy state to an end of the alkyl chain of the blue light TADF material, thereby allowing the material to be processed by solution spin coating, and the terminal carbazole can act as a host, enabling non-doping of a luminescent layer while effectively avoiding phase separation.
Claims12
A blue light thermally activated delayed fluorescence (TADF) material, comprising a structure of generic Formula 1:
- wherein R1 is one of chemical structures of Formula 2 to Formula 14:
- R2 is one of chemical structures of Formula 15 to Formula 19.
A method of preparing a blue light thermally activated delayed fluorescence (TADF) material, comprising the following steps:
- Step S1, providing a reaction vessel, and adding a first reactant R1 to the reaction vessel, wherein the first reactant R1 has one of chemical structures of Formula 2 to Formula 14:
- Step S2, removing air in the reaction vessel, and adding sodium hydride and tetrahydrofuran to the reaction vessel for reaction at a first temperature for a first period of time;
- Step S3, providing a second reactant, and adding the second reactant to the reaction vessel for reaction for a second period of time to obtain a reaction solution, wherein the second reactant has a chemical structure of generic Formula 23;
- wherein R2 has one of chemical structures of Formula 15 to Formula 19:
- Step S4, pouring the reaction solution into water, followed by a series of separation and purification comprising extraction, combining organic extract, rotary distillation, and column chromatography to obtain a blue light TADF material, wherein
- the blue light TADF material has a structure of a generic formula as follows:
Dependencies are inferred from the claim text.