Su, H.-C.H.-C.SuFang, F.-C.F.-C.FangHwu, T.-Y.T.-Y.HwuChen, H.-F.H.-F.ChenKEN-TSUNG WONGCHUNG-CHIH WUSHIE-MING PENG2010-09-202018-07-102010-09-202018-07-102007-041616301Xhttp://ntur.lib.ntu.edu.tw//handle/246246/204203https://www.scopus.com/inward/record.uri?eid=2-s2.0-34248564909&doi=10.1002%2fadfm.200600372&partnerID=40&md5=a1ce9909eb5673f703b06a136bf96accHighly efficient orange and green emission from single-layered solid-state light-emitting electrochemical cells based on cationic transition-metal complexes [Ir(ppy)2sb]PF6 and [Ir(dFppy) 2sb]PF6 (where ppy is 2-phenylpyridine, dFppy is 2-(2,4-difluorophenyl)pyridine, and sb is 4,5-diaza-9,9′-spirobifluorene) is reported. Photoluminescence measurements show highly retained quantum yields for [Ir(ppy)2sb]PF6 and [Ir(dFppy)2 sb]PF 6 in neat films (compared with quantum yields of these complexes dispersed in m-bis(N-carbazolyl)benzene films). The spiroconfigured sb ligands effectively enhance the steric hindrance of the complexes and reduce the self-quenching effect. The devices that use single-layered neat films of [Ir(ppy)2sb]PF6 and [Ir(dFppy)2sb]PF 6 achieve high peak external quantum efficiencies and power efficiencies of 7.1 % and 22.6 1m W-1) at 2.5 V, and 7.1 % and 26.2 1m W-1 at 2.8 V, respectively. These efficiencies are among the highest reported for solid-state light-emitting electrochemical cells, and indicate that cationic transition-metal complexes containing ligands with good steric hindrance are excellent candidates for highly efficient solid-state electrochemical cells. © 2007 WILEY-VCH Verlag GmbH & Co. KGaA.en-USComplexation; Light emission; Measurement theory; Photoluminescence; Quantum theory; Transition metals; Green emission; Photoluminescence measurements; Steric hindrance; Electrochemical cellsjournal article2-s2.0-34248564909http://ntur.lib.ntu.edu.tw/bitstream/246246/204203/1/Highly efficient orange and green solid-state light-emitting electrochemical cells based on cationic Ir-III complexes with enhanced steric hindrance.pdf