Photophysical Properties and OLED Applications of Phosphorescent Platinum(II) Schiff Base Complexes

✍ Scribed by Chi-Ming Che; Chi-Chung Kwok; Siu-Wai Lai; Andreas F. Rausch; Walter J. Finkenzeller; Nianyong Zhu; Hartmut Yersin

• Publisher: John Wiley and Sons
• Year: 2010
• Tongue: English
• Weight: 619 KB
• Volume: 16
• Category: Article
• ISSN: 0947-6539
• DOI: 10.1002/chem.200902183

✦ Synopsis

Abstract

The syntheses, crystal structures, and detailed investigations of the photophysical properties of phosphorescent platinum(II) Schiff base complexes are presented. All of these complexes exhibit intense absorption bands with λ~max~ in the range 417–546 nm, which are assigned to states of metal‐to‐ligand charge‐transfer (^1^MLCT) ^1^[Pt(5d)→π*(Schiff base)] character mixed with ^1^[lone pair(phenoxide)→π*(imine)] charge‐transfer character. The platinum(II) Schiff base complexes are thermally stable, with decomposition temperatures up to 495 °C, and show emission λ~max~ at 541–649 nm in acetonitrile, with emission quantum yields up to 0.27. Measurements of the emission decay times in the temperature range from 130 to 1.5 K give total zero‐field splitting parameters of the emitting triplet state of 14–28 cm^−1^. High‐performance yellow to red organic light‐emitting devices (OLEDs) using these platinum(II) Schiff base complexes have been fabricated with the best efficiency up to 31 cd A^−1^ and a device lifetime up to 77 000 h at 500 cd m^−2^.