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, Ricky M S WONG, Ping Fang Xia, Kok Wai CHEAH, Chin Hsin Chen, Wei Huang

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98 Citations (Scopus)

Abstract

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%.

Original languageEnglish
Pages (from-to)339-343
Number of pages5
JournalAdvanced Materials
Volume21
Issue number3
DOIs
Publication statusPublished - 19 Jan 2009

Scopus Subject Areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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