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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Unconventional Increase in Non-Radiative Transitions in Plasmon-Enhanced Luminescence: A Distance-Dependent Coupling

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Autor(es):
Guidelli, Eder Jose ; Ramos, Ana Paula ; Baffa, Oswaldo
Número total de Autores: 3
Tipo de documento: Artigo Científico
Fonte: SCIENTIFIC REPORTS; v. 6, NOV 16 2016.
Citações Web of Science: 1
Resumo

We used Optically Stimulated Luminescence (OSL) from X-ray-irradiated sodium chloride nanocrystals to investigate how silver nanoparticle (AgNP) films enhanced luminescence. We controlled the emitter-AgNP distance and used the OSL intensity and decay times to explore the plasmonic interactions underlying the enhanced luminescence. Both intensity and decay times depended on the emitter-AgNP distance, which suggested that a mechanism involving energy transfer from the localized surface plasmons (LSPs) to the trapped electrons took place through a distance-dependent coupling. Compared to other plasmon-enhanced mechanisms, the energy transfer observed here occurred in the opposite bias: LSP relaxation stimulated electron transfer from non-optically active traps to optically active traps, which culminated in enhanced emission. Therefore, a different mechanism of plasmonic coupling converted optically unreachable electrons into useful luminescence information. (AU)

Processo FAPESP: 11/09521-8 - Luminescência opticamente estimulada em condições de ressonância plasmônica
Beneficiário:Éder José Guidelli
Linha de fomento: Bolsas no Brasil - Doutorado