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Photophysical Properties and OLED Applications of Phosphorescent Platinum(II) Schiff Base Complexes
Author(s) -
Che ChiMing,
Kwok ChiChung,
Lai SiuWai,
Rausch Andreas F.,
Finkenzeller Walter J.,
Zhu Nianyong,
Yersin Hartmut
Publication year - 2010
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200902183
Subject(s) - phosphorescence , schiff base , platinum , oled , imine , photochemistry , acetonitrile , chemistry , materials science , absorption (acoustics) , crystallography , fluorescence , organic chemistry , catalysis , optics , physics , layer (electronics) , composite material
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 .