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

Research output: Contribution to journalArticle

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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 (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.

Original languageEnglish (US)
Pages (from-to)4500-4505
Number of pages6
JournalJournal of Physical Chemistry
Volume96
Issue number11
StatePublished - 1992

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Bleaching
Excited states
bleaching
Thin films
thin films
excitation
decay
Amorphous films
Excitons
Laser pulses
Monomers
Wavelength
chloroaluminum phthalocyanine
monomers
excitons
energy
pulses
wavelengths

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Femtosecond excited-state dynamics in fluoro- and chloroaluminum phthalocyanine thin films. / Williams, V. S.; Mazumdar, Sumitendra; Armstrong, Neal R; Ho, Z. Z.; Peyghambarian, Nasser N.

In: Journal of Physical Chemistry, Vol. 96, No. 11, 1992, p. 4500-4505.

Research output: Contribution to journalArticle

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

AU - Williams, V. S.

AU - Mazumdar, Sumitendra

AU - Armstrong, Neal R

AU - Ho, Z. Z.

AU - Peyghambarian, Nasser 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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