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; Eric Wei Guang Diau

doi:10.1016/j.cplett.2006.10.120

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, Eric Wei Guang Diau

Department of Chemistry

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9 Citations (Scopus)

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 (λ_ex = 410 nm and λ_em = 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 language	English
Pages (from-to)	452-456
Number of pages	5
Journal	Chemical Physics Letters
Volume	432
Issue number	4-6
DOIs	https://doi.org/10.1016/j.cplett.2006.10.120
Publication status	Published - 2006 Dec 11

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All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)
Physical and Theoretical Chemistry

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Luo, L., Chang, C. W., Lin, C. Y., & Diau, E. W. G. (2006). Femtosecond fluorescence dynamics of zinc biphenylporphine in nanocrystalline TiO₂ films: Evidence for interfacial electron transfer through space. Chemical Physics Letters, 432(4-6), 452-456. https://doi.org/10.1016/j.cplett.2006.10.120

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

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.",

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AU - Lin, Ching Yao

AU - Diau, Eric Wei Guang

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AB - 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.

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10.1016/j.cplett.2006.10.120