树枝状铱配合物的合成与发光性能研究

Synthesis and luminescent properties of dendritic iridium complexes

设计、合成了3个新颖的环金属配体1-苯甲基-2-苯基-苯并咪唑[BPBM]、1-(4-甲氧基-苯甲基)-2-(4-甲氧基-苯基)-苯并咪唑[MBMPB]和1-(4-N,N-二甲基-苯甲基)-2-(4-N,N-二甲基-苯基)-苯并咪唑[DBPA],并以乙酰丙酮(Hacac)为辅助配体合成了3个高效绿色铱配合物Ir(BPBM)2(acac)(1)、Ir(MBMPB)2(acac)(2)和Ir(DPBA)2(acac)(3)。由于在配体上引入了大的非平面取代基,分子间的浓度猝灭被有效地抑制;室温下,3个配合物在纯固态下都展示了明亮的绿光发射,且详细研究了它们的热稳定性和光物理性能。结果表明:该类配合物具有短的激发态寿命和高的光致磷光效率,在制备非掺杂有机电致发光器件方面具有潜在的应用前景。

Three novel cyclometalated ligands 1-benzyl-2-phenyl-lH-benzoimidazole [BPBM]. 1-（4-Methoxy-ben- zyl）-2-（4-methoxy-phenyl）-lH-benzoimidazole [MBMPB] ,and 4-（2-（4-Dimethylamino-phenyl）-benzoinidazol-l-ylmethyl）- phenyl- dimethyl-amine[DBPA]were designed and synthesized, and the corresponding highly efficiency green-emitting phos- phorescent of iridium complexes Ir（BPBM）2 （acac）（1）Ir（MBMPB）2 （acac）（2） and Ir（DPBA）2 （acac）（3） using acetylace- tone （acac） as auxiliary ligand were also successfully synthesized. The ligands were functionalized by bulky non-planarity substituents, thus the phosphorescent concentration quenching was substantially suppressed, and all complexes exhibited bright photoluminescence in solid state. The photo-physical properties and thermal stability of the three iridium complexes were researched in detail. These complexes had high photoluminescent efficiency and short excited lifetime, indicating they had potential application in fabricating nondoped electrophosphorescence device.