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Highly Efficient Multifluorenyl Host Materials with Unsymmetrical Molecular Configurations and Localized Triplet States for Green and Red Phosphorescent Devices
Author(s) -
Han Chunmiao,
Zhu Liping,
Li Jing,
Zhao Fangchao,
Zhang Zhen,
Xu Hui,
Deng Zhaopeng,
Ma Dongge,
Yan Pengfei
Publication year - 2014
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/adma.201400710
Subject(s) - phosphorescence , quenching (fluorescence) , polaron , materials science , charge (physics) , annihilation , charge carrier , host (biology) , optoelectronics , physics , electron , fluorescence , quantum mechanics , ecology , biology
Highly efficient green and red electro‐phosphorescence is achieved in devices with the host material DPESPODEF3. The multiple fluorenyl moieties of the host material are arranged such that it has an unsymmetrical molecular configuration, and its triplet‐state location is tuned such that it has independent energy (ET) and charge transfer (CT) channels. As a result, DPESPODEF3 can suppress triplet–triplet annihilation and triplet–polaron quenching. In the resulting green and red phosphorescent devices, impressive external quantum efficiencies of ca. 20% and 16% and power efficiencies of ca. 75 and 20 lm W −1 , respectively, are observed.