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- W2059637048 abstract "A comparison of manganese activated CdS nanorods with the nonactivated ones prepared by simple chemical methods in micellar medium reveals quantum confinement and blue shift in optical spectroscopy as a function of Mn2+. Powder XRD of all samples reveals orientation along the 002 plane, confirmed by HRTEM. Nonactivated CdS gives a blue band edge emission at 455 nm in the PL spectrum getting quenched on Mn2+ addition. The PL spectra of Mn2+ added CdS exhibit first an emission at 367.7 nm, which later gets subjected to Davydov splitting with a separation of ∼0.045 eV, the singlet intensity decreasing and the doublet intensity increasing with Mn2+ input. This PL property is manifested in EPR as due to two different Mn2+ environments: (i) individual tetrahedrally coordinated uncoupled Mn2+ ions; (ii) Mn2+−Mn2+ physical dimer moieties. These are interpreted to arise from (i) the formation of a first layer of MnS on a CdS surface and (ii) the latter due to a second layer of MnS on top of the first to form MnS−MnS dimers. Mn2+ is present as metastable β-MnS. The Davydov splitting is accompanied by a small energy shift. The double layer formation is confirmed by a bleaching experiment. Also noted is a low intensity band edge emission of CdS perturbed by Mn2+ blue-shifted from the quenched 455 nm emission. ICP and EDS confirm the purity of samples." @default.
- W2059637048 created "2016-06-24" @default.
- W2059637048 creator A5041138971 @default.
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- W2059637048 date "2009-04-30" @default.
- W2059637048 modified "2023-09-30" @default.
- W2059637048 title "Davydov Split PL Emission and EPR Correlation in β-MnS Layered CdS Nanorods" @default.
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- W2059637048 doi "https://doi.org/10.1021/jp9013042" @default.
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