@Article{JLumin__56_61, author = {E. Vauthey and J. Voss and C. {De Caro} and A. Renn and U.P. Wild}, title = {{Spectral Hole Burning Study of Squaraine Dyes in Polymer Films}}, journal= {J. Lumin.}, ISSN = {0022-2313}, volume= {56}, pages = {61-69}, url = {http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TJH-46CC8FY-3T&_user=779890&_handle=W-WA-A-A-WE-MsSAYVA-UUW-AUCUACAWDZ-VEWYUWZYA-WE-U&_fmt=summary&_coverDate=10%2F31%2F1993&_rdoc=8&_orig=browse&_srch=%23toc%235311%231993%23999439998%23328764!&_cdi=5311&view=c&_acct=C000043220&_version=1&_urlVersion=0&_userid=779890&md5=e945ab910908d250d33dae5a01aa263c}, doi= {10.1016/0022-2313(93)90055-R}, 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.}}, year = {1993} }