Esipt luminescent material with delayed fluorescence properties and its preparation method and application
A technology of luminescent materials and delayed fluorescence, applied in luminescent materials, chemical instruments and methods, organic chemistry, etc., can solve problems such as complex device preparation processes, and achieve broad application prospects, good film-forming properties, and good thermodynamic stability.
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[0040] The above-mentioned preparation method of the ESIPT luminescent material with delayed fluorescence properties comprises the following steps:
[0041] S1, preparation of intermediate A,
[0042]
[0043] It should be noted here that since in the above compound structure, X is S or O or N. Therefore, when X is the above three elements respectively, the preparation process of intermediate A is slightly different. The preparation of intermediate A-1 and intermediate A-2 will be described below.
[0044] The preparation process of intermediate A-1 (when X is S) is as follows:
[0045]
[0046]Add o-aminothiophenol (1.63g, 12mmol) and 5-bromosalicylic acid (2.14g, 15.6mmol) into 100ml of polyphosphoric acid, and stir at 168°C for 8-16 hours. After the reaction, sodium hydroxide solution was added to the reaction liquid, and adjusted to neutrality with sodium bicarbonate. It was extracted with dichloromethane and a white fluffy solid HBT-4Br (2.6 g) was obtained afte...
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