Monodispersed cation-disordered cubic AgInS2 nanocrystals with enhanced fluorescence

Zhenyu Feng; Pengcheng Dai; Xicheng Ma; Jinhua Zhan; Zhaojun Lin
January 2010
Applied Physics Letters;1/4/2010, Vol. 96 Issue 1, p013104
Academic Journal
Monodispersed metastable cubic AgInS2 nanocrystals with an average size of around 2.5 nm are obtained via a solution-phase reaction. In contrast with the usual chalcopyrite and orthorhombic phase, Ag+ and In3+ cations in metastable cubic AgInS2 are randomly coordinated by four S2- anions. A phase transition from cation-disordered cubic to orthorhombic AgInS2 occurs with the increased reaction temperature or elongated reaction time. The photoluminescence quantum yield of cation-disordered cubic AgInS2 nanocrystals could reach 10% at room temperature, which is much higher than that of orthorhombic AgInS2 nanocrystals obtained via a similar approach.


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