Thermally activated delayed fluorescence material, preparation method thereof and organic electroluminescent device
A thermal activation delay, fluorescent material technology, applied in the direction of luminescent materials, electrical solid devices, chemical instruments and methods, etc., can solve the problems affecting the stability of OLED devices, fast efficiency decay speed, OLED device efficiency decline, etc., to achieve enhanced absorption The effect of electronic ability, reduction of interaction, and improvement of light extraction efficiency
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[0040] Such as figure 1 As shown, based on the above purpose, the embodiment of the present application also provides a preparation method of the above-mentioned thermally activated delayed fluorescent material, which includes the following steps:
[0041] S10, adding a catalyst, a basic substance, and a solvent to the first reactant and the second reactant, the first reactant being a bromide of cyclopentane[def]fluorene-4,8-dione;
[0042] S20, a substitution reaction occurs between the first reactant and the second reactant to obtain a reaction solution;
[0043] S30, performing impurity removal treatment on the reaction solution to obtain the general structural formula: The thermally activated delayed fluorescence material, R 1 -R 6 is the electron donor unit.
[0044] The second reactant can be R 1 hydride, R 2 hydride, R 3 hydride, R 4 hydride, R 5 The hydride, and R 6 Any one or more combinations of the hydrides.
[0045] The catalyst may be a palladium catal...
Embodiment 1
[0054] The first reactant in this example is 2,6-dibromocyclopentane[def]fluoren-4,8-dione, and the second reactant is 9,10-dihydro-9,9-dimethyl Acridine, the catalyst is three (dibenzylideneacetone) dipalladium, the catalyst ligand is two (2-diphenylphosphophenyl) ethers, and the molar ratio of the first reactant and the second reactant is 1:2.1 . The first reactant and the second reactant have a substitution reaction to synthesize the target compound 1, and the structural formula of the target compound 1 is: The synthetic route of target compound 1 is as follows:
[0055]
[0056] Specifically, 2,6-dibromocyclopentane[def]fluorene-4,8-dione (3.64g, 10mmol), 9,10-dihydro-9,9-dimethyl Acridine (4.40g, 21mmol), tris(dibenzylideneacetone)dipalladium (92mg, 0.1mmol), bis(2-diphenylphosphophenyl)ether (108mg, 0.2mmol) and sodium tert-butoxide (2.0g, 21mmol), pumped three times, injected 80mL of anhydrous toluene under argon atmosphere, and then reacted at 80°C for 24 hours....
Embodiment 2
[0068] The synthesis method of the target compound 2 provided in this example is the same as in Example 1, except that the first reactant is 1,7-dibromocyclopentane[def]fluorene-4,8-dione, and the target compound The structural formula of 2 is The synthetic route of target compound 2 is as follows:
[0069]
[0070]Specifically, 1,7-dibromocyclopentane[def]fluorene-4,8-dione (3.64g, 10mmol), 9,10-dihydro-9,9-dimethyl Acridine (4.40g, 21mmol), tris(dibenzylideneacetone)dipalladium (92mg, 0.1mmol), bis(2-diphenylphosphophenyl)ether (108mg, 0.2mmol) and sodium tert-butoxide (2.0g, 21mmol), pumped three times, injected 80mL of anhydrous toluene under argon atmosphere, and then reacted at 80°C for 24 hours. After the reaction was cooled to room temperature, the reaction solution was poured into 200 mL of saturated brine, and a red solid was obtained by suction filtration, which was separated and purified by column chromatography (eluent: dichloromethane:n-hexane, v:v, 1:1), ...
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