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Title

Spectral Hole Burning Study of Squaraine Dyes in Polymer Films

Authors
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. https://archive-ouverte.unige.ch/unige:3020

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Deposited on : 2009-09-21

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