Strong luminescent iridium complexes with C∧N-N structure in ligands and their potential in efficient and thermally stable phosphorescent OLEDs

Bao Xiu Mi, Peng Fei Wang, Zhi Qiang Gao, Chun Sing Lee, Shuit Jong Lee, Hui Ling Hong, Xiao Ming Chen, Man Shing Wong, Ping Fang Xia, Kok Wai Cheah, Chin Hsin Chen, Wei Huang

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111 引用 (Scopus)

摘要

A new Ir complex with the ligand 1,4-bis(phenyl)phthalazine (BPPa) resembling sp 2-hybrid N adjacent to the chelating N atom was developed. The complexes were also studied for their potential in efficient and thermally stable phosphorescent organic light emitting diodes (OLED). The structure of Ir complex shows that the molecule has octahedral geometry, with three BPPa ligands cyclometalated to the central iridium atom. The only difference between the molecular structures of Ir(PPy) 3 and Ir(PPya) 3 arises from the atom adjacent to the chelating N in the ligand. Ir(BPPa) 3 emits a red light peaked at 625 nm in a CH 2Cl 2 solution, with a PL quantum yield of 0.20 measured with Rhodamine B as a calibrations standard. The devices with 2, 5, and 10% of Ir(BPPa) 3 show maximum external quantum efficiencies (EQE) of 4.0, 8.3, and 5.1%.

源语言英语
页(从-至)339-343
页数5
期刊Advanced Materials
21
3
DOI
出版状态已出版 - 19 1月 2009
已对外发布

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