Femtosecond excited-state dynamics in fluoro- and chloroaluminum phthalocyanine thin films

V. S. Williams; S. Mazumdar; N. R. Armstrong; Z. Z. Ho; N. Peyghambarian

doi:10.1021/j100190a069

Femtosecond excited-state dynamics in fluoro- and chloroaluminum phthalocyanine thin films

V. S. Williams, S. Mazumdar, N. R. Armstrong, Z. Z. Ho, N. Peyghambarian

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Abstract

Photoinduced absorption on the high-energy side of the Q-band has been observed and time-resolved in polycrystalline/amorphous thin films of both fluoroaluminum and chloroaluminum phthalocyanine. The films were pumped with ≈100-fs optical pulses at various wavelengths inside the inhomogeneously broadened Q-band, including 620 and 760 nm. The induced absorption signal is accompanied by a bleaching signal on the low-energy edge of the Q-band. The bleaching signal resembles a blue-shifted monomer absorbance spectrum. The induced absorption signal develops as the absorption bleaching signal decays, suggesting exciton decay into a subgap state. The different bimolecular decay dynamics observed for the absorption bleaching (τ_eff ≈ 700 fs) and induced absorption (τ_eff ≈ 2 ps) signals support this conclusion. Analyses of the results and possible origins of the indicated subgap state are discussed.

Original language	English (US)
Pages (from-to)	4500-4505
Number of pages	6
Journal	Journal of physical chemistry
Volume	96
Issue number	11
DOIs	https://doi.org/10.1021/j100190a069
State	Published - 1992

ASJC Scopus subject areas

General Engineering
Physical and Theoretical Chemistry

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title = "Femtosecond excited-state dynamics in fluoro- and chloroaluminum phthalocyanine thin films",

abstract = "Photoinduced absorption on the high-energy side of the Q-band has been observed and time-resolved in polycrystalline/amorphous thin films of both fluoroaluminum and chloroaluminum phthalocyanine. The films were pumped with ≈100-fs optical pulses at various wavelengths inside the inhomogeneously broadened Q-band, including 620 and 760 nm. The induced absorption signal is accompanied by a bleaching signal on the low-energy edge of the Q-band. The bleaching signal resembles a blue-shifted monomer absorbance spectrum. The induced absorption signal develops as the absorption bleaching signal decays, suggesting exciton decay into a subgap state. The different bimolecular decay dynamics observed for the absorption bleaching (τeff ≈ 700 fs) and induced absorption (τeff ≈ 2 ps) signals support this conclusion. Analyses of the results and possible origins of the indicated subgap state are discussed.",

author = "Williams, {V. S.} and S. Mazumdar and Armstrong, {N. R.} and Ho, {Z. Z.} and N. Peyghambarian",

year = "1992",

doi = "10.1021/j100190a069",

language = "English (US)",

volume = "96",

pages = "4500--4505",

journal = "Journal of physical chemistry",

issn = "0022-3654",

publisher = "American Chemical Society",

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TY - JOUR

T1 - Femtosecond excited-state dynamics in fluoro- and chloroaluminum phthalocyanine thin films

AU - Williams, V. S.

AU - Mazumdar, S.

AU - Armstrong, N. R.

AU - Ho, Z. Z.

AU - Peyghambarian, N.

PY - 1992

Y1 - 1992

N2 - Photoinduced absorption on the high-energy side of the Q-band has been observed and time-resolved in polycrystalline/amorphous thin films of both fluoroaluminum and chloroaluminum phthalocyanine. The films were pumped with ≈100-fs optical pulses at various wavelengths inside the inhomogeneously broadened Q-band, including 620 and 760 nm. The induced absorption signal is accompanied by a bleaching signal on the low-energy edge of the Q-band. The bleaching signal resembles a blue-shifted monomer absorbance spectrum. The induced absorption signal develops as the absorption bleaching signal decays, suggesting exciton decay into a subgap state. The different bimolecular decay dynamics observed for the absorption bleaching (τeff ≈ 700 fs) and induced absorption (τeff ≈ 2 ps) signals support this conclusion. Analyses of the results and possible origins of the indicated subgap state are discussed.

AB - Photoinduced absorption on the high-energy side of the Q-band has been observed and time-resolved in polycrystalline/amorphous thin films of both fluoroaluminum and chloroaluminum phthalocyanine. The films were pumped with ≈100-fs optical pulses at various wavelengths inside the inhomogeneously broadened Q-band, including 620 and 760 nm. The induced absorption signal is accompanied by a bleaching signal on the low-energy edge of the Q-band. The bleaching signal resembles a blue-shifted monomer absorbance spectrum. The induced absorption signal develops as the absorption bleaching signal decays, suggesting exciton decay into a subgap state. The different bimolecular decay dynamics observed for the absorption bleaching (τeff ≈ 700 fs) and induced absorption (τeff ≈ 2 ps) signals support this conclusion. Analyses of the results and possible origins of the indicated subgap state are discussed.

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Femtosecond excited-state dynamics in fluoro- and chloroaluminum phthalocyanine thin films

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