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Proceedings Paper

Excited-state absorption and radiative up-conversion in porphyrin-doped gels
Author(s): X. Wang; L. M. Yates III; Edward T. Knobbe
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Paper Abstract

Optical absorption and emission behavior have been investigated in aluminosilicate sol-gel materials containing the sodium salt of tetra-4-sulfonatophenylporphyrinatocopper(II). Concentration-dependent nonlinear absorption was observed in the porphyrin-doped specimens. Up-converted optical emission from the second excited doublet band was studied, and a saturated behavior was observed as a function of incoming excitation energies. These phenomena have been attributed to excited state absorption from both doublet and quartet manifolds. Intersystem crossing and quartet-quartet absorption effects are believed to dominate the nonlinear processes, especially in the case of strong excitation. Rate equation analysis also suggests that the quartet manifold is extensively involved for intersystem relaxation and excited state absorption. Good agreement was obtained between experimental observations and the presented rate equations.

Paper Details

Date Published: 13 October 1994
PDF: 12 pages
Proc. SPIE 2288, Sol-Gel Optics III, (13 October 1994); doi: 10.1117/12.188960
Show Author Affiliations
X. Wang, Oklahoma State Univ. (United States)
L. M. Yates III, Oklahoma State Univ. (United States)
Edward T. Knobbe, Oklahoma State Univ. (United States)

Published in SPIE Proceedings Vol. 2288:
Sol-Gel Optics III
John D. Mackenzie, Editor(s)

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