Luminescence studies of localized gap states in colloidal ZnS nanocrystals

被引:494
作者
Denzler, D [1 ]
Olschewski, M [1 ]
Sattler, K [1 ]
机构
[1] Univ Hawaii Manoa, Dept Phys & Astron, Honolulu, HI 96822 USA
关键词
D O I
10.1063/1.368425
中图分类号
O59 [应用物理学];
学科分类号
摘要
ZnS nanoparticles were prepared by chemical precipitation of Zn2+ with sulfur ions in aqueous solution. The ultraviolet-excited samples reveal detailed structure in the luminescence spectra. A doublet pattern observed in the long wavelength region is attributed to the coexistence of the two crystalline forms in ZnS particles. The visible luminescent radiation at 590.1 nm is due to Mn impurities. The dominant emission band at short wavelengths exhibits a quadruple fine structure with peaks located at 416.1, 423.9, 430.1, and 437.8 nm which are identified with optical transitions arising from vacancy and interstitial sites for both Zn and S atoms. (C) 1998 American Institute of Physics. [S0021-8979(98)07717-2].
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页码:2841 / 2845
页数:5
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