
%0 Journal Article
%A Sakurovs, R 
%A Ghiggino, KP 
%T Temperature dependence of tryptophan and tyrosine luminescence in poly(vinyl alcohol) films
%J Australian Journal of Chemistry
%D 1981/07/01
%V 34
%N 7
%P 1367-1372
%K 
%R https://doi.org/10.1071/CH9811367
%U https://www.publish.csiro.au/paper/CH9811367 
%X The temperature dependence of the fluorescence and phosphorescence from tyrosine and tryptophan in poly(vinyl alcohol) films has been studied over the temperature range 90-295 K. A kinetic scheme is proposed which allows the calculation of activation energies for excited singlet and triplet state deactivation processes. A single temperature-dependent radiationless process from the singlet state is observed for tyrosine and tryptophan, with activation energies of 5.2±0.4 and 7.1±0.6 kJ mol-1 respectively. However, two distinct temperature transitions have been detected for triplet-state relaxation at 180 and 255 K. The role of polymer phase transitions in determining excited state relaxation pathways of embedded luminescent probes is discussed. 
