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Spectral Hole Burning Study of Squaraine Dyes in Polymer Films

Voss, Jochen
De Caro, Cosimo
Renn, Alois
Wild, Urs P.
Published in Journal of Luminescence. 1993, vol. 56, no. 1-3, p. 61-69
Abstract A study of the hole-burning mechanisms of bis[4-(diethylamino)-2-hydroxyphenyl]squaraine (DEAH) and bis[4-(disethylamino)-phenyl]squaraine (DEA) in hydrogen-bonding and non-hydrogen-bonding polymers is presented. Intramolecular H-bonding is only possible for DEAH. In all systems, the spectral holes are not persistent and decay with a distribution of rates ranging from 10-5s-1 to about 1 s-1, the time resolution of the experiment. In H-donating matrices, this distribution varies with the burning wavelength. From the hole-burning efficiencies and the kineticsof the hole refilling, four different types of nonphotochemical hole-burning mechanisms are postulated. The efficiency of these mechanisms depends mainly on the occurrence of processes slowing down the relaxation to the initial product state.
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Research group Groupe Vauthey
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VAUTHEY, Eric et al. Spectral Hole Burning Study of Squaraine Dyes in Polymer Films. In: Journal of Luminescence, 1993, vol. 56, n° 1-3, p. 61-69. doi: 10.1016/0022-2313(93)90055-R https://archive-ouverte.unige.ch/unige:3020

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Deposited on : 2009-09-21

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