Femtosecond dynamics of fluoro-aluminum phthalocyanine and linear alkane molecules

Z. Z. Ho; V. Williams; N. Peyghambarian; W. M. Hetherington

doi:10.1117/12.948265

Femtosecond dynamics of fluoro-aluminum phthalocyanine and linear alkane molecules

Z. Z. Ho, V. Williams, N. Peyghambarian, W. M. Hetherington

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

The dynamics of fluoro-aluminum phthalocyanine polycrystalline thin films is studied using differential transmission spectroscopy with femtosecond laser pulses. Following excitation by 620 nm pulses into the first electronic transition a very rapid energy redistribution of the excitons is directly observed within the 55 fs duration of the pump pulse. Following this process two extremely fast decay routes lead to the recovery of the ground state: exciton-exciton annihilation with an intensity dependentdecay of 550 fs at power density of 1.2 GW/cm 2 and exciton-phonon coupling with a 4 ps decay time. A complete interpretation of the decay mechanisms based on the Frenkel exciton terminology successfully accounts for the observed results.

Original language	English (US)
Pages (from-to)	51-58
Number of pages	8
Journal	Proceedings of SPIE - The International Society for Optical Engineering
Volume	971
DOIs	https://doi.org/10.1117/12.948265
State	Published - Dec 21 1988

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Computer Science Applications
Applied Mathematics
Electrical and Electronic Engineering

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title = "Femtosecond dynamics of fluoro-aluminum phthalocyanine and linear alkane molecules",

abstract = "The dynamics of fluoro-aluminum phthalocyanine polycrystalline thin films is studied using differential transmission spectroscopy with femtosecond laser pulses. Following excitation by 620 nm pulses into the first electronic transition a very rapid energy redistribution of the excitons is directly observed within the 55 fs duration of the pump pulse. Following this process two extremely fast decay routes lead to the recovery of the ground state: exciton-exciton annihilation with an intensity dependentdecay of 550 fs at power density of 1.2 GW/cm 2 and exciton-phonon coupling with a 4 ps decay time. A complete interpretation of the decay mechanisms based on the Frenkel exciton terminology successfully accounts for the observed results.",

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AU - Ho, Z. Z.

AU - Williams, V.

AU - Peyghambarian, N.

AU - Hetherington, W. M.

PY - 1988/12/21

Y1 - 1988/12/21

N2 - The dynamics of fluoro-aluminum phthalocyanine polycrystalline thin films is studied using differential transmission spectroscopy with femtosecond laser pulses. Following excitation by 620 nm pulses into the first electronic transition a very rapid energy redistribution of the excitons is directly observed within the 55 fs duration of the pump pulse. Following this process two extremely fast decay routes lead to the recovery of the ground state: exciton-exciton annihilation with an intensity dependentdecay of 550 fs at power density of 1.2 GW/cm 2 and exciton-phonon coupling with a 4 ps decay time. A complete interpretation of the decay mechanisms based on the Frenkel exciton terminology successfully accounts for the observed results.

AB - The dynamics of fluoro-aluminum phthalocyanine polycrystalline thin films is studied using differential transmission spectroscopy with femtosecond laser pulses. Following excitation by 620 nm pulses into the first electronic transition a very rapid energy redistribution of the excitons is directly observed within the 55 fs duration of the pump pulse. Following this process two extremely fast decay routes lead to the recovery of the ground state: exciton-exciton annihilation with an intensity dependentdecay of 550 fs at power density of 1.2 GW/cm 2 and exciton-phonon coupling with a 4 ps decay time. A complete interpretation of the decay mechanisms based on the Frenkel exciton terminology successfully accounts for the observed results.

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Femtosecond dynamics of fluoro-aluminum phthalocyanine and linear alkane molecules

Abstract

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