Highly luminescent semiconductor nanocrystals with graded band gap were synthesized using a hot injection method. The band gap of nanocrystals were controlled by gradual incorporation of sulfur to CdSe nanocrystals by applying severely asymmetric composition of reactants [(Cd)/(Se,S) ≫ 1]. The maximum emission wavelength of the grown nanocrystals was varied by controlling the concentration ratio of VI group element, i.e. Se and S. A green light was emitted from Cd(Se,S) nanocrystals with [Se]:[S] = 1:3 in the reactant mixture and the maximum quantum yield measured by comparing with Rhodamine 6G was larger than 80%.
Research on Chemical Intermediates – Springer Journals
Published: Sep 9, 2010
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