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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]|
|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.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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