Excited-state absorption and radiative up-conversion in porphyrin-doped gels

X. Wang; L. M. Yates III; Edward T. Knobbe

doi:10.1117/12.188960

13 October 1994 Excited-state absorption and radiative up-conversion in porphyrin-doped gels

X. Wang, L. M. Yates III, Edward T. Knobbe

Proceedings Volume 2288, Sol-Gel Optics III; (1994) https://doi.org/10.1117/12.188960
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

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.

Citation Download Citation

X. Wang, L. M. Yates III, and Edward T. Knobbe "Excited-state absorption and radiative up-conversion in porphyrin-doped gels", Proc. SPIE 2288, Sol-Gel Optics III, (13 October 1994); https://doi.org/10.1117/12.188960

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