期刊
JOURNAL OF LUMINESCENCE
卷 87-9, 期 -, 页码 315-318出版社
ELSEVIER
DOI: 10.1016/S0022-2313(99)00336-1
关键词
ZnS : Mn2+; nanoparticles; time-resolved spectroscopy
类别
Five years ago it was reported that nanocrystalline ZnS:Mn2+ can yield both high luminescence efficiencies and a spectacular lifetime shortening, which suggested that doped semiconductor nanoparticles form a new class of luminescent materials for various applications. From lifetime measurements and time-resolved spectroscopy we conclude that the Mn2+ emission of nanocrystalline ZnS:Mn2+ does in fact not show a spectacular shortening of the decay time upon decreasing particle size. The luminescence of nanocrystalline ZnS:Mn2+ indeed shows a short decay time component( similar to 100 ns), but also a long (ms) decay time is observed. The short decay time is ascribed to a defect-related emission of ZnS, and is not from the decay of the T-4(1)-(6)A(1) transition of the Mn2+ impurity. The T-4(1)-(6)A(1) transition of the Mn2+ has a 'normal' decay of about 1.9 ms. Based on our observations, we conclude that doped semiconductor nanoparticles do not form a new class of luminescent materials, combining a high efficiency with a short (ns) decay time. (C) 2000 Elsevier Science B.V. All rights reserved.
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