Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 1, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3280372
Keywords
fluorescence; indium compounds; nanostructured materials; photoluminescence; silver compounds; solid-state phase transformations; ternary semiconductors
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Funding
- National Natural Science Fund of China [NSFC 50972083]
- Program for New Century Excellent Talents in University [NCET-06-0586]
- Chinese Ministry of Education [109098]
- National Basic Research Program of China (973 Program) [2005CB623601, 2007CB936602]
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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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