Femtosecond dynamics of fluoro-aluminum phthalocyanine and linear alkane molecules

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

Research output: Contribution to journalArticlepeer-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 languageEnglish (US)
Pages (from-to)51-58
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume971
DOIs
StatePublished - 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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