Blue organic electrophosphorescent material iridium metal complex, preparation method thereof and organic electroluminescent device
A technology of iridium metal complexes and phosphorescent materials, applied in the field of organic electroluminescent materials, can solve problems such as poor blue light color purity, achieve the effects of reducing self-quenching phenomenon, facilitating evaporation, and improving luminescent performance
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[0040] see figure 1 , the preparation method of the above-mentioned blue light organic electrophosphorescent material iridium metal complex, comprising the following steps:
[0041] S1. Under inert gas (at least one of nitrogen and argon, the same below), the structural formula is The compound A and the structural formula are The compound B is dissolved in an organic solvent containing a catalyst and a base, and then the Suzuki coupling reaction is carried out at a temperature of 80-100 °C for 5-15 hours. After the reaction is stopped, the reaction solution is separated and purified to obtain the structural formula: Cyclometallic ligands; wherein, the molar ratio of compound A to compound B is 1:1~1:2; the reaction formula is:
[0042] S2. Under the protection of an inert gas, the cyclometal ligand and iridium trichloride trihydrate (IrCl 3 ·3H 2 O) Dissolve in a mixed solvent of 2-ethoxyethanol and water with a volume ratio of 3:1 at a molar ratio of 2:1 to 3:1, heat...
Embodiment 1
[0064] Example 1: Complex bis(3-(2',6'-difluoropyridin-3'-yl)pyridazine-N,C 2 ') (tetrakis (1-pyrazole) boron) synthesis of iridium
[0065] (1) Synthesis of 3-(2',6'-difluoropyridin-3'-yl)pyridazine:
[0066]
[0067] Under nitrogen protection, add 1.59g (10mmol) 3-bromopyridazine (A1), 1.91g (12mmol) 2,6-difluoropyridine-3-boronic acid (B), 40mL toluene, 10mL water, 1.61 g (5mmol) tetrabutylammonium bromide (TBTA), 1.38g (10mmol) anhydrous potassium carbonate, 0.23g (0.2mmol) tetrakis (triphenylphosphine) palladium, then stirred and refluxed at 80°C for 15h. After the reaction solution was cooled to room temperature, it was extracted with dichloromethane, separated, washed with water until neutral, and dried over anhydrous magnesium sulfate. After filtration, the filtrate was distilled off the solvent under reduced pressure to obtain the crude product. Silica gel column chromatography was carried out with dichloromethane as the eluent. After drying, 1.27 g of solid was...
Embodiment 2
[0086] Example 2: Complex bis(3-(2',6'-difluoropyridin-3'-yl)pyridazine-N,C 2 ') Synthesis of (3-trifluoromethyl-5-(pyridin-2'-yl)-1,2,4-triazole) iridium
[0087] (1) The synthetic steps of 3-(2',6'-difluoropyridin-3'-yl)pyridazine refer to step (1) of Example 1;
[0088] (2) The synthesis steps of the iridium-containing dichloro dimer whose ligand is 3-(2',6'-difluoropyridin-3'-yl)pyridazine are the same as step (2) of Example 1;
[0089] (3) Complex bis(3-(2',6'-difluoropyridin-3'-yl)pyridazine-N,C 2 ') Synthesis of (3-trifluoromethyl-5-(pyridin-2'-yl)-1,2,4-triazole) iridium
[0090]
[0091] Under nitrogen protection, 0.64g (3mmol) 3-trifluoromethyl-5-(pyridin-2-yl)-1,2,4-triazole and 1.22g (1mmol) ligand were 3-(2', The iridium-containing dichloro dimer of 6'-difluoropyridin-3'-yl)pyridazine was dissolved in 60mL of chloroform, under the catalysis of 0.54g (10mmol) sodium methoxide, stirred and heated to reflux state, the reaction 24h. After naturally cooling to ...
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