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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

104 Scopus citations

Abstract

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.

Original languageEnglish
Article number261118
JournalApplied Physics Letters
Volume89
Issue number26
DOIs
StatePublished - 1 Dec 2006

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