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Structural and optical studies of Zn1−xCdxS quantum dots synthesized by in situ technique in PVA matrix
Ist Teil von
Optical materials, 2014-11, Vol.37, p.439-445
Ort / Verlag
Oxford: Elsevier B.V
Erscheinungsjahr
2014
Link zum Volltext
Quelle
Elsevier ScienceDirect Journals Complete
Beschreibungen/Notizen
•In situ synthesis of PVA capped Zn1−xCdxS (x=0.1, … 0.9) quantum dots.•UV–Visible absorption edges shifting and band gap tuning effect were observed.•XRD peak shifted to higher θ with increase in Cd:Zn ratio.•Quenching of PL intensity is observed with increase in Cd:Zn ratio.•3PA nonlinear optical response and limiting properties were studied.
Zn1−xCdxS (x=0.1, 0.2, 0.3, 0.4, 0.5 … 0.9) quantum dots were synthesized successfully using novel in situ technique in polyvinyl alcohol (PVA) matrix. The PVA acted as a capping agent as well as a reducing agent. The structural and optical properties of the samples were studied by X-ray diffraction (XRD), TEM analysis, UV–Visible absorption and photoluminescence spectroscopy (PL). X-ray diffraction patterns revealed cubic zinc blende phase of the samples with lattice parameter in the range 5.47–5.75Å. Optical band gap values were calculated from the absorption spectra and observed a decreasing band gap with increasing Cd:Zn ratio. The Raman spectra were recorded using conventional Micro Raman technique. Photoluminescence spectra showed asymmetric broad emission with multiple maxima. The concentration dependent quenching of PL intensity with increasing Cd:Zn ratio was observed along with a red shift. The nonlinear optical (NLO) and limiting properties were studied using Z-scan technique.