Novel iridium complexes as high-efficiency yellow and red phosphorescent light emitters for organic light-emitting diodes
作者:Jun Hong Yao、Changgua Zhen、Kian Ping Loh、Zhi-Kuan Chen
DOI:10.1016/j.tet.2008.09.033
日期:2008.11
amorphous structure. All the iridium complexes were fabricated into organic light-emitting devices with the device configuration of ITO/PEDOT:PSS (50 nm)/PVK (50 wt %):PBD (40 wt %):Ir complex (10 wt %) (45 nm)/TPBI (40 nm)/LiF (0.5 nm)/Ca (20 nm)/Ag (150 nm). Yellow to red light emission has been achieved from the iridium complexes guest materials. Complex C1 (yellow light emission) achieved an efficiency
合成和表征了一系列基于螺双芴配体和乙酰丙酮酸(acac)辅助配体的新型双环金属化铱配合物。通过循环伏安法(CV)研究了它们的电化学性能。通过UV-vis吸收光谱和CV结果的组合计算出所有配合物的HOMO,LUMO和能带隙。TGA和DSC结果表明它们具有优异的热稳定性和无定形结构。所有铱配合物均制成具有ITO / PEDOT:PSS(50 nm)/ PVK(50 wt%):PBD(40 wt%):Ir配合物(10 wt%)(45的器件配置)的有机发光器件)/ TPBI(40 nm)/ LiF(0.5 nm)/ Ca(20 nm)/ Ag(150 nm)。铱配合物的客体材料实现了黄色至红色的发光。复杂的C1(黄色发光)在198 cd / m 2时达到36.4 cd / A(10.1%)的效率,而复合C4(红色发光)达到4.6%的外部量子效率。在高电流密度下,外部量子效率的轻微降低表明,新开发的配合物有效地抑制了三重态-三重态(T