Journal
JOURNAL OF NANOPARTICLE RESEARCH
Volume 15, Issue 9, Pages -Publisher
SPRINGER
DOI: 10.1007/s11051-013-1910-0
Keywords
CuInS2; Semiconductor; Nanocrystals; Fluorescence; Lifetime
Categories
Funding
- Program for Taishan Scholars from Shandong province government
- National Natural Science Foundation of China [21071061]
- Natural Science Foundation of Shandong Province [ZR2010EZ001, ZR2009FM072]
- Outstanding Young Scientists Foundation Grant of Shandong Province [BS2010CL004, BS2012CL004]
- Research Foundation from University of Jinan [XKY0911, XKY1006]
- Doctor Foundation from University of Jinan [XBS1015, XBS1027]
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We present the synthesis of CuInS2 quantum dots (QDs) with a size range of 3-4 nm through a phosphor-free method. The photoluminescence (PL) properties of CuInS2 QDs synthesized using various Cu/In molar ratios were investigated. With the decrease of Cu/In molar ratio, the PL peak wavelength revealed a clear blue shift by ca. 100 nm and a noticeable increase in PL intensity. Being coated with a ZnS shell on CuInS2 QDs, the resulting core/shell QDs exhibited a dramatic increase of PL efficiency and stability, with the maximum PL efficiency up to 39 %. This is ascribed to the efficient reduction of non-radiative recombination after surface modification. In addition, the PL peak wavelengths were tuned from 670 to 800 nm. The transmission electron microscopy observation and X-ray diffraction analysis indicated that the CuInS2 and CuInS2/ZnS QDs revealed a dot shaped morphology and exhibited a wurtzite structure. Time-resolved fluorescence spectroscopy revealed that CuInS2/ZnS core/shell QDs apparently exhibited a slow decay compared with the CuInS2 cores (214 ns for CuInS2/ZnS QDs and 172 ns for CuInS2 cores). Because of the tunable near-infrared range emission, high stability and long lifetimes of the CuInS2/ZnS QDs, they will be very useful in applications such as solar cell and biological imaging.
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