Radiative quantum efficiency of CdSe/ZnS quantum dots suspended in different solvents |
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Authors: | Viviane Pilla Leandro P Alves Egberto Munin Marcos TT Pacheco |
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Institution: | Instituto de Pesquisa e Desenvolvimento - IPD, UNIVAP, CEP 12244-000, São José dos Campos, SP, Brazil |
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Abstract: | The radiative quantum efficiencies η of the CdSe/ZnS core-shell nanoparticles embedded into polymethyl methacrylate (PMMA) and suspended in three different solvents: chloroform (CHCl3), toluene (C6H5CH3) and tetrahydrofuran (C4H8O) were measured using thermal lens (TL) technique. The mode-mismatched pump-probe TL measurements were accomplished in function of the CdSe/ZnS quantum-dot concentration (12-60 mg/ml) at λe = 594 nm (pump) and λp = 632.8 nm (probe). The values obtained for η were higher for CdSe/ZnS nanoparticles suspended in tetrahydrofuran and chloroform, as compared to the values for toluene. Thermal diffusivity (D) and the absolute nonradiative quantum efficiency (φ) were determined. |
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Keywords: | CdSe/ZnS core-shell colloidal nanoparticles Radiative quantum efficiency Thermal lens |
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