Radiative quantum efficiency of CdSe/ZnS core-shell colloidal solutions: Size-dependence |
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Authors: | Viviane Pilla Leandro P Alves Marcos TT Pacheco Egberto Munin |
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Institution: | Instituto de Pesquisa e Desenvolvimento-IPD, UNIVAP, Av. Shishima Hifumi, 2911, Urbanova, CEP 12244-000, São José dos Campos, SP, Brazil |
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Abstract: | 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 λp = 632.8 nm was used as the probe beam and an Ar+ laser (at λe = 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 (φ) and radiative quantum efficiencies (η) of the CdSe/ZnS were determined. Dependence on core size (∼2-5 nm) and concentration (∼0.01-0.62 mg/ml) was observed for both φ and η parameters. |
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Keywords: | CdSe/ZnS core-shell colloidal nanoparticles Thermal lens Thermo-optical parameters |
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