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Reduction of Self‐Quenching Effect in Organic Electrophosphorescence Emitting Devices via the Use of Sterically Hindered Spacers in Phosphorescence Molecules
Author(s) -
Xie H. Z.,
Liu M. W.,
Wang O. Y.,
Zhang X. H.,
Lee C. S.,
Hung L. S.,
Lee S. T.,
Teng P. F.,
Kwong H. L.,
Zheng H.,
Che C. M.
Publication year - 2001
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/1521-4095(200108)13:16<1245::aid-adma1245>3.0.co;2-j
Subject(s) - phosphorescence , electroluminescence , materials science , iridium , quenching (fluorescence) , steric effects , photoluminescence , dopant , photochemistry , molecule , phosphorescent organic light emitting diode , biphenyl , quantum yield , ligand (biochemistry) , optoelectronics , fluorescence , doping , nanotechnology , organic chemistry , chemistry , optics , physics , layer (electronics) , biochemistry , receptor , catalysis
The incorporation of a sterically demanding pinene moiety into the ligand of a phosphorescent iridium complex prevents self‐quenching by neighboring molecules, raising its photoluminescence quantum yield to 0.71 in solution. The compound is highly interesting as a dopant in electroluminescent devices, as shown for various concentrations of the complex in 4,4′‐bis‐(carbazolyl)‐biphenyl (CBP) (see Figure).