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Rupinder K. Beri,Priyesh More,B.G. Bharate,P.K. Khanna 한국물리학회 2010 Current Applied Physics Vol.10 No.2
Single-step green synthesis of ZnSe quantum dots (QDs) from 1,2,3-selenadiazole and zinc acetate resulted in formation of high-quality mono-disperse ZnSe with engineered band-gap. The present method is a non-TOP green route where oleic acid is used as a surfactant. The size quantization effect can be monitored by UV–visible spectroscopy which shows in the range 370–387 nm (3.20–3.35 eV), a blue shift of about 70–90 nm with respect bulk ZnSe. Photoluminescence measurement revealed bandgap emission at ~390 nm (3.18 eV, Stokes shift of <10 nm with FWHM <30 nm). Broadened XRD pattern indicated formation of cubic ZnSe and the estimation of particle size from the line broadening at h1 1 1i matched well the TEM analysis.
“Yellow emitting” magic-size cadmium selenide nanocrystals via a simplified spray pyrolysis method
Rupinder K. Beri,Pawan K. Khanna,Vidyanand Singh,B.R. Mehta 한국물리학회 2011 Current Applied Physics Vol.11 No.3
Magic-size nanocrystals of cadmium selenide showing yellow-light emission were synthesized in a single-step spray pyrolysis process at 150 ℃. An organoselenium precursor dissolved in N,N-dimethyl formamide was introduced via a syringe pump and the droplets were decomposed in hot solution of cadmium oleate. The ratio of Cd:Se precursor, the process temperature at which the decomposition is carried out and the co-formation of quantum dots play critical role in unique optical property of yellowlight emission.