Radiative quantum efficiency of CdSe/ZnS core-shell colloidal solutions: Size-dependence

Autor(es)

Pilla, Viviane ^[1] ; Alves, Leandro P. ^[1] ; Pacheco, Marcos T. T. ^[1] ; Munin, Egberto ^[1]

Afiliação do(s) autor(es)

^[1] UNIVAP, IPD, BR-00244000 Sao Jose Dos Campos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Optics Communications; v. 281, n. 23, p. 5925-5928, DEC 1 2008.
• Citações Web of Science: 11

Resumo

Thermo-optical parameters of CdSe/ZnS core-shell nanoparticles suspended in toluene were measured using a thermal lens (TL) technique. TL transient measurements were performed using the mode-mismatched dual-beam (excitation and probe) configuration. A He-Ne laser at lambda(p) = 632.8 nm was used as the probe beam and an Ar(+) laser (at lambda(e) = 514.5 nm) was used as the excitation beam for studies as a function of both core size and concentration of CdSe/ZnS nanocrystals. The fraction thermal load (phi) and radiative quantum efficiencies (eta) of the CdSe/ZnS were determined. Dependence on core size (similar to 2-5 nm) and concentration (similar to 0.01-0.62 mg/ml) was observed for both phi and eta parameters. (C) 2008 Elsevier B.V. All rights reserved. (AU)

• Processo FAPESP: 06/01277-2 - Espectroscopia não linear em nanocristais semicondutores funcionalizados para aplicações
• Beneficiário: Viviane Pilla
• Modalidade de apoio: Auxílio à Pesquisa - Regular