期刊
INTERNATIONAL JOURNAL OF APPLIED GLASS SCIENCE
卷 6, 期 4, 页码 339-344出版社
WILEY PERIODICALS, INC
DOI: 10.1111/ijag.12138
关键词
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资金
- Fundamental Research Funds for the Central Universities of China [WUT: 2014-VII-039]
- Natural Science Foundation of Hubei Province [2012FFA024, 2013CFA008]
- National Natural Science Foundation of China [51202170]
- Program for New Century Excellent Talents in University [NCET-13-0943]
- Research Fund for the Doctoral Program of Higher Education of China [FRDP: 20130143110013]
- Chutian Scholar Program of Hubei Province
Size-dependent Stokes shift of PbS quantum dots (QDs) formed in the glasses was investigated. PbS QDs with diameters of 3.5 nm to 13.3 nm were precipitated in silicate glasses with different S/Pb ratios using the conventional thermal treatment method. Absorption and photoluminescence (PL) of PbS QDs were tuned from similar to 0.9 mu m (1.38 eV) to similar to 2.3 mu m (0.54 eV) by adjusting the diameters of PbS QDs from 3.5 nm to 13.3 nm. PL energies of QDs exhibited linear dependence on the absorption energies with a slope of 0.484 for PbS QDs with band gap energies larger than 0.98 eV, and the maximum Stokes shift was found to be 206.2 meV for 3.5 nm-sized PbS QDs. For large PbS QDs with band gap energies smaller than 0.98 eV, Stokes shift was found to be similar to 20 meV or smaller. The size-dependent Stokes shift indicated that surface defects made the main contribution and relative energy positions of these surface defects were strongly dependent on the size of PbS QDs.
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