Femtosecond fluorescence dynamics of zinc biphenylporphine in nanocrystalline TiO2 films: Evidence for interfacial electron transfer through space

Liyang Luo, Chih Wei Chang, Ching Yao Lin, Wei-Guang Diau*

*Corresponding author for this work

Research output: Contribution to journalArticle

9 Scopus citations

Abstract

The femtosecond fluorescence dynamics of zinc biphenylporphine (ZnBPP) were investigated in solution and in two solid-state environments - ZnBPP/glass and ZnBPP/TiO2 - with S2 excitation (λex = 410 nm and λem = 630 nm). Our results indicate that the transient in solution involves a persistent component that becomes completely quenched in thin-film samples; for solid films at least three decay coefficients are required to fit the transients. For ZnBPP/TiO2 films, the fluorescence was quenched significantly through J-type aggregation and interfacial electron transfer (IET) through space. Photocurrent measurements were also performed to confirm the existence of IET through space between ZnBPP molecules and TiO2 nanoparticles.

Original languageEnglish
Pages (from-to)452-456
Number of pages5
JournalChemical Physics Letters
Volume432
Issue number4-6
DOIs
StatePublished - 11 Dec 2006

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