High fluorescence quantum efficiency of CdSe/ZnS quantum dots embedded in GPTS/TEOS-derived organic/silica hybrid colloids

Autor(es)

Alencar, Lorena D. S. ^[1] ; Pilla, Viviane ^[2] ; Andrade, Acacio A. ^[2] ; Donatti, Dario A. ^[1] ; Vollet, Dimas R. ^[1] ; De Vicente, Fabio S. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Paulista UNESP, Dept Fis, BR-13506900 Rio Claro, SP - Brazil

^[2] Univ Fed Uberlandia, Inst Fis, BR-38400902 Uberlandia, MG - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Chemical Physics Letters; v. 599, p. 63-67, APR 18 2014.
• Citações Web of Science: 8
• Assunto(s): Nanocristais

Resumo

The thermo-optical properties of CdSe/ZnS core-shell quantum dots (QDs) embedded in organic/silica hybrid colloids (organic/silica sols) were measured using the thermal lens (TL) technique. GPTS/TEOS-derived organic/silica hybrid colloids were prepared by a sol-gel method from the hydrolysis reaction of 3-glycidoxypropyltrimethoxysilane (GPTS) and tetraethylorthosilicate (TEOS) alkoxides. TL transient measurements were performed to study the effect of the CdSe/ZnS QDs (with three different sizes similar to 2.4, 2.9 and 4.4 nm) embedded in GPTS/TEOS-derived organic/silica sols. The thermal diffusivity, the fraction thermal load and the radiative quantum efficiency (eta) were determined. Fluorescence measurements corroborate the TL results and high eta values were obtained. (C) 2014 Elsevier B. V. All rights reserved. (AU)

• Processo FAPESP: 11/18149-5 - Estudo de filmes híbridos de sílica luminescentes e fotossensíveis preparados via sol-gel
• Beneficiário: Fábio Simões de Vicente
• Modalidade de apoio: Auxílio à Pesquisa - Regular