Luminescence decay kinetics of Mn{sup 2+}-doped ZnS nanoclusters grown in reverse micelles
Journal Article
·
· Physical Review. B, Condensed Matter and Materials Physics
- Department of Chemistry, University of California, Santa Cruz, California 95060 (United States)
- Pacific Northwest National Laboratory (PNNL), P.O. Box 999, Richland, Washington 99352 (United States)
We report the synthesis and luminescence decay kinetics of 1.2-nm Mn{sup 2+}-doped ZnS nanoclusters grown in reverse micelles. The preparation method produces small particles with narrow-size distribution and fluorescence bands near 400-450 nm and 585 nm. Time-dependent fluorescence decay measurements using picosecond, nanosecond, and millisecond techniques reveal relaxation processes on all three time scales. In the doped sample, the red emission detected at 600 nm exhibits a 1-2 ms decay in addition to faster decays with time constants on the order of hundreds of ps, a few ns and tens of {mu}s. While the slow decay is the same as that of bulk Mn{sup 2+}-doped ZnS, the fast decays are present for both doped and undoped samples and are unique to nanocluster ZnS, which are attributed to deep trap-state emission. The blue luminescence near 400-450 nm is attributed to shallow trap-state emission of ZnS. These results help to resolve the controversy in the literature regarding the lifetime of the Mn{sup 2+} emission in Mn-doped ZnS nanoparticles. (c) 2000 The American Physical Society.
- OSTI ID:
- 20217120
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 3 Vol. 62; ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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