TY - JOUR
T1 - Highly luminescent water-soluble quaternary Zn-Ag-In-S quantum dots and their unique precursor S/In ratio-dependent spectral shifts
AU - Deng, Dawei
AU - Qu, Lingzhi
AU - Cheng, Zhiqiang
AU - Achilefu, Samuel
AU - Gu, Yueqing
N1 - Funding Information:
This work was financially supported by the Program for New Century Excellent Talents ( NCET-12-0974 ) in University of the Ministry of Education of china , the National Natural Science Foundation of China ( 30800257 , 81220108012 , 30970776 , 31050110123 , 81371627 and 81071194 ), the Natural Science Foundation of Jiangsu Province ( BK20116394 ), the Fundamental Research Funds for the Central Universities (Program No. JKP2011017 ) and A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).
PY - 2014
Y1 - 2014
N2 - Quaternary I-II-III-VI semiconductor quantum dots (QDs) containing less toxic elements are receiving increasing attention because of their promising applications in solar cells, light-emitting diode (LED), and biological labeling. Despite its advantages, the quaternary system is more complex than the binary and ternary analogues. This is reflected in the difficulty to control the size, size distribution, elemental composition, and optical properties of quaternary I-II-III-VI QDs, especially in aqueous medium. In this work, we have synthesized new aqueous quaternary Zn-Ag-In-S (ZAIS) QDs with tunable photoluminescence (PL) for the first time, giving the highest PL quantum yield (QY) of 30%, which is close to those of the conventional well-developed aqueous II-VI QDs. Most importantly, three unique spectral shifts depending on precursor S/In ratio were observed in this quaternary system. The spectral were characterized by diverse analytical methods to systematically establish distinct features of the quaternary nanomaterials. The results demonstrate the potential utility of this new water-soluble system in fundamental and applied researches with quaternary QDs.
AB - Quaternary I-II-III-VI semiconductor quantum dots (QDs) containing less toxic elements are receiving increasing attention because of their promising applications in solar cells, light-emitting diode (LED), and biological labeling. Despite its advantages, the quaternary system is more complex than the binary and ternary analogues. This is reflected in the difficulty to control the size, size distribution, elemental composition, and optical properties of quaternary I-II-III-VI QDs, especially in aqueous medium. In this work, we have synthesized new aqueous quaternary Zn-Ag-In-S (ZAIS) QDs with tunable photoluminescence (PL) for the first time, giving the highest PL quantum yield (QY) of 30%, which is close to those of the conventional well-developed aqueous II-VI QDs. Most importantly, three unique spectral shifts depending on precursor S/In ratio were observed in this quaternary system. The spectral were characterized by diverse analytical methods to systematically establish distinct features of the quaternary nanomaterials. The results demonstrate the potential utility of this new water-soluble system in fundamental and applied researches with quaternary QDs.
KW - Fluorescence
KW - Precursor S/In ratio
KW - Quantum dots
KW - Zn-Ag-In-S
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U2 - 10.1016/j.jlumin.2013.09.063
DO - 10.1016/j.jlumin.2013.09.063
M3 - Article
AN - SCOPUS:84887003278
SN - 0022-2313
VL - 146
SP - 364
EP - 370
JO - Journal of Luminescence
JF - Journal of Luminescence
ER -