Quantum yield measurements by thermal lens in highly absorbing samples: The case of highly doped rhodamine B organic/silica xerogels
| Autor: | M. Ventura, V. S. Zanuto, Luis C. Malacarne, D. S. Manoel, F. S. De Vicente, Camila Barbosa Bramorski, Tomaz Catunda, J.F.M. dos Santos |
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| Přispěvatelé: | Universidade de Saõ Paulo, Universidade Estadual Paulista (Unesp), Universidade Estadual de Maringá (UEM) |
| Rok vydání: | 2019 |
| Předmět: |
Materials science
Physics and Astronomy (miscellaneous) Doping Analytical chemistry Quantum yield 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Fluorescence LENTES Rhodamine Matrix (chemical analysis) chemistry.chemical_compound chemistry 0103 physical sciences Thermal Rhodamine B General Materials Science Absorption (chemistry) 010306 general physics 0210 nano-technology |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP Scopus Repositório Institucional da UNESP Universidade Estadual Paulista (UNESP) instacron:UNESP |
| ISSN: | 2475-9953 |
| Popis: | Made available in DSpace on 2020-12-12T01:05:25Z (GMT). No. of bitstreams: 0 Previous issue date: 2019-11-04 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 ∼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. Instituto de Física de Saõ Carlos Universidade de Saõ Paulo Departamento de Física Universidade Estadual Paulista UNESP Departamento de Física Universidade Estadual de Maringá Departamento de Física Universidade Estadual Paulista UNESP |
| Databáze: | OpenAIRE |
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