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Type: Artigo de periódico
Title: Phosphorescence Lifetime In Polymer Relaxation Studies: Phase Resolution Method [aquisição De Tempos De Vida De Fosforescência Com Resolução De Fase E Sua Aplicação Ao Estudo De Relaxações Em Polímeros]
Author: Talhavini M.
Atvars T.D.Z.
Abstract: We describe in this work a simple experimental set up to perform time dependent luminescence experiments in time scales from mili-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.
Rights: aberto
Identifier DOI: 
Date Issue: 1998
Appears in Collections:Unicamp - Artigos e Outros Documentos

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