Efficient solid-state host-guest light-emitting electrochemical cells based on cationic transition metal complexes

Hai-Ching Su, Chung Chih Wu*, Fu Chuan Fang, Ken Tsung Wong

*此作品的通信作者

研究成果: Article同行評審

104 引文 斯高帕斯(Scopus)

摘要

The authors demonstrate highly efficient solid-state light-emitting electrochemical cells (LECs) consisting of green-emitting [Ir (dFppy)2 (SB)] + (P F6-) as the host and orange-emitting [Ir (ppy)2 (SB)] + (P F6-) as the guest [where dFppy is 2-(2,4-difluorophenyl)pyridine, SB is 4,5-diaza-9, 9′ -spirobifluorene, and ppy is 2-phenylpyridine]. Photophysical studies show that with the optimized host-guest compositions, the emission is mainly from the guest and photoluminescence quantum yields are largely enhanced over those of pure host and guest films due to suppressed intermolecular interactions. Correspondingly, LECs based on such host-guest cationic complex systems show substantially enhanced quantum efficiencies (power efficiencies) of up to 10.4% (36.8 lmW), representing a 1.5 times enhancement compared to those of pure host and guest devices. Such results indicate that the host-guest system is essential and useful for achieving highly efficient solid-state LECs.

原文English
文章編號261118
期刊Applied Physics Letters
89
發行號26
DOIs
出版狀態Published - 2006

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