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Type: Artigo de periódico
Title: Phosphorescence lifetime in polymer relaxation studies: Phase resolution method.
Author: Talhavini, M
Atvars, TDZ
Abstract: 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.
Subject: phase resolution lifetime determinations
polymer relaxation processes
Country: Brasil
Editor: Soc Brasileira Quimica
Rights: aberto
Date Issue: 1998
Appears in Collections:Unicamp - Artigos e Outros Documentos

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