Dendritic complexes for white polymer light-emitting diodes. Chinese scientists have fabricated single-layer white polymer light-emitting devices (WPLED) by double-doping sky-blue emitter iridium(III) bis(2-(4,6-difluorophenyl)-pyridinato-N,C2)picolinate (FIrpic) into orange iridium dendrimers. These WPLEDs achieve the maximum current/power/external quantum efficiencies of 37.0 cd A−1/19.4 lm W−1/18.5%, which are among the highest efficiencies for dual-color WPLEDs ever reported.
Highly efficient single-layer white polymer light-emitting devices employing triphenylamine-based iridium dendritic complexes as orange emissive component: Minrong Zhu, Jianhua Zou, Sujun Hu, Chen’ge Li, Chuluo Yang, Hongbin Wu, Jingui Qin and Yong Cao, J. Mater. Chem., 2012, 22, 361-366
Stacking-induced phosphorescence from organic radical materials. A new class of organic phosphorescent materials have been developed by scientists at University of Science and Technology of China. Based on salts of an organic radical material, the phosphorescent complexes show stacking-induced white-light and blue-light phosphorescence. The team say that these materials could lead to new LEDs.
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– Russell Johnson, Development Editor, Journal of Materials Chemistry