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 (CHCl 3), toluene (C 6H 5CH 3) and tetrahydrofuran (C 4H 8O) 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 λ e = 594 nm (pump) and λ p = 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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