Artículos de revistas
Phosphorescence lifetime in polymer relaxation studies: Phase resolution method.
Registro en:
Quimica Nova. Soc Brasileira Quimica, v. 21, n. 3, n. 332, n. 336, 1998.
0100-4042
WOS:000073678400015
Autor
Talhavini, M
Atvars, TDZ
Institución
Resumen
We describe in this work a simple experimental set up to perform time dependent luminescence experiments in time scales from mill-seconds to seconds, based on the phase resolution of the emission signal. This system is composed by modulation of a continuous light source with an external chopper controlled by a lock-in amplifier. We exemplified the utility of the system in studies of phosphorecence emission using benzophenone dissolved in polystyrene and since the phosphorescence intensity and lifetime are temperature-dependent processes, we also studied polymer relaxation processes in the temperature range from 20 to 400K. A software that drives the spectrofluorimeter and controls both the cryosystem and the lock-in amplifier was developed. 21 3 332 336