Quantum yield measurements by thermal lens in highly absorbing samples: The case of highly doped rhodamine B organic/silica xerogels

Autor(es)

dos Santos, J. F. M. ^[1] ; Zanuto, V. S. ^[1] ; Ventura, M. ^[1] ; Bramorski, C. B. ^[1] ; Catunda, T. ^[1] ; Manoel, D. S. ^{[1, 2]} ; Malacarne, L. C. ^[3] ; de Vicente, F. S. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13566590 Sao Carlos, SP - Brazil

^[2] Univ Estadual Paulista, UNESP, Dept Fis, BR-13506900 Rio Claro, SP - Brazil

^[3] Univ Estadual Maringa, Dept Fis, BR-87020900 Maringa, Parana - Brazil

• Tipo de documento: Artigo Científico
• Fonte: PHYSICAL REVIEW MATERIALS; v. 3, n. 11 NOV 4 2019.
• Citações Web of Science: 0

Resumo

In this work, rhodamine B-doped GPTS/TEOS-derived organic/silica monolithic xerogels were prepared by the predoping sol-gel process. Thermal lens method was applied to determine thermo-optical properties of the samples. Since the samples present a high optical absorption coefficient, the high absorption theoretical TL model was introduced. Thermal diffusivities, optical absorption coefficients, and fluorescence quantum yield values were determined for samples with different rhodamine B (RhB) concentrations, from 10(-5) to 10(-2) M. The dye-doped organic/silica xerogels present a high fluorescence quantum yield (up to 90%), maintaining the value over 50% until a concentration of similar to 1.6 mM. To the best of our knowledge, RhB-doped transparent monoliths with a high fluorescence quantum yield with the highest RhB concentration reported in a solid hybrid matrix were obtained. (AU)

• Processo FAPESP: 17/16392-6 - Espectroscopia Não-linear em Sólidos Dopados com íons Terras Raras
• Beneficiário: Vitor Santaella Zanuto
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado