以3-乙酰基樟脑作为辅助配体的环金属铱配合物的合成及光电性能研究

Synthesis and Photoelectric Property of Bis-Cyclometalated Iridium Complexes with 3-Acetyl Camphor as the Ancillary Ligand

以立体位阻3-乙酰基樟脑为辅助配体合成了系列新型的环金属铱配合物3-乙酰基樟脑-2-(2,4-二氟)苯基吡啶环金属铱配合物[(46dfppy)2Ir(acam)],3-乙酰基樟脑-2-苯基吡啶环金属铱配合物[(ppy)2Ir(acam)],3-乙酰基樟脑-2-苯并噻吩吡啶环金属铱配合物[(btp)2Ir(acam)].将配合物的吸收光谱、光致发光光谱以及光致发光效率与辅助配体为乙酰丙酮(acac)的对应配合物进行了比较,发现在配合物中引入具有大空间位阻的3-乙酰基樟脑使配合物的光致发光效率均有所提高.并将(ppy)2Ir(acam)用于有机电致发光器件,电致发光光谱在516 nm处有一最大强度峰,驱动电压为12 V时最大亮度为10930 cd/m2,最大亮度效率达到14.6 cd/A,电压为10.7 V时最大功率为4.23 lm/W,亮度为698 cd/m2.

A series of bis-cyclometalated iridium complexes,iridium（III） bis（2-（2,4-difluoro）phenylpyridine-N,C2＇） 3-acetyl camphor [（46dfppy）2Ir（acam）],iridium（III） bis（2-phenylpyridinato-N,C2＇） 3-acetyl camphor [（ppy）2Ir（acam）] and iridium（III） bis（2-（2＇-benzothienyl） pyridinato-N,C3＇） 3-acetyl camphor [（btp）2Ir（acam）] were synthesized with sterically 3-acetyl camphor as ancillary ligand.The absorption spectrum,PL spectra and photoluminescence efficiency of complexes were compared with the corresponding complexes with acetylacetone（acac） as the ancillary ligand.It was found that all of their photoluminescence efficiency could be improved when sterically hindered 3-acetyl camphor was introduced.When [（ppy）2Ir（acam）] was used as light-emitting devices,the EL spectra has the largest peak intensity at 516 nm.The device has the greatest brightness of 10930 cd/m2 and maximum brightness efficiency of 14.6 cd/A at 12 V.The highest power effciency and brightness are 4.23 lm/W and 698 cd/m2 respectively at 10.7 V.