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- W2035984911 abstract "In this study the fusion method was used to synthesize PbS nanocrystal quantum dots (QDs) embedded in S-doped glass matrix (SiO2−Na2CO3−ZnO−Al2O3−PbO2−B2O3). Optical absorption, atomic force microscopy (AFM), and photoluminescence (PL) were used to investigate different samples. Experimental data indicate that the PbS QD-size is controlled by the different annealing times the S-doped glass matrix is submitted to. The size-dependence of the optical transitions in PbS QDs were obtained by numerical calculation and compared with the experimental data. A strong anti-Stokes photoluminescence (ASPL), from green (2.409 eV) to violet (2.978 eV), was found in all samples, at room temperature. A possible microscopic mechanism leading to the ASPL, which involves a two-photon absorption in two separate steps through a surface state, is proposed." @default.
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- W2035984911 date "2002-07-09" @default.
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- W2035984911 title "Anti-Stokes Photoluminescence in Nanocrystal Quantum Dots" @default.
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- W2035984911 doi "https://doi.org/10.1021/jp0208743" @default.
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