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Bimetallic Cyclometalated Iridium(III) Diastereomers with Non‐Innocent Bridging Ligands for High‐Efficiency Phosphorescent OLEDs
Author(s) -
Zheng Yonghao,
Batsanov Andrei S.,
Fox Mark A.,
AlAttar Hameed A.,
Abdullah Khalid,
Jankus Vygintas,
Bryce Martin R.,
Monkman Andrew P.
Publication year - 2014
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201407475
Subject(s) - iridium , phosphorescence , oled , bimetallic strip , dopant , electroluminescence , photochemistry , diastereomer , ligand (biochemistry) , chemistry , materials science , quantum efficiency , bridging ligand , hexane , platinum , metal , combinatorial chemistry , layer (electronics) , nanotechnology , catalysis , stereochemistry , organic chemistry , optoelectronics , fluorescence , doping , biochemistry , physics , receptor , quantum mechanics
Two phosphorescent dinuclear iridium(III) diastereomers (ΛΔ/ΔΛ) and (ΛΛ/ΔΔ) are readily separated by making use of their different solubilities in hot hexane. The bridging diarylhydrazide ligand plays an important role in the electrochemistry and photophysics of the complexes. Organic light‐emitting devices (OLEDs) that use these complexes as the green‐emissive dopants in solution‐processable single‐active‐layer architectures feature electroluminescence efficiencies that are remarkably high for dinuclear metal complexes, achieving maximum values of 37 cd A −1 , 14 lm W −1 , and 11 % external quantum efficiency.