| 초록 |
Based on the earlier reports and observations, we designed new blue phosphorescent iridium complexes which contain 2-(2,4-difluorophenyl)-4-methylpyridine, 2-(2,4-difluoro-3-trifluoromethylphenyl)-4-methylpyridine, 2-(2,4-difluorophenyl)-4-methoxypyridine, 2-(2,4-difluoro-3-trifluoromethylphenyl)-4-methoxypyridine, and 2-(2,4-difluorophenyl)-2-N,N-dimethylaminopyridine as main ligands, and the new substituted 4-picolinates, 2-pyridyltriazolate derivatives, imidazole carboxylates of low HOMO and high LUMO energy level as ancillary ligands. CF3 group substitutions at 5’-position of main ligands led to 8-10 nm hypsochromic shift and CH3 substitution on 4-position of pyridyltriazole ancillarty ligand resulted in further 8 nm hysochromic shift in emissions. N-Methylimidazoyl substitutions on 5-position of 3-(trifluoromethyl)-1,2,4-triazole in place of 4-methylprydyl allowed almost equivalent blue shifts in their emissions. |
