Enhanced Photoluminescence for ZnS Nanocrystals Doped with Mn2+ Close to Carboxyl Groups and/or S2− Vacancies View Full Text


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Article Info

DATE

1998

AUTHORS

T. Isobe, T. Igarashi, M. Konishi, M. Senna

ABSTRACT

ZnS nanocrystals doped with Mn 2+ ions are prepared by a solution process and subsequent UV irradiation to produce the samples with different S/(Zn+Mn) ratios and/or surface modification by acrylic acids. Coordination states around Mn 2+ , ions were examined at 9 and 35 GHz by electron paramagnetic resonance spectroscopy. The Mn 2+ sites in the vicinity of 2- vacancies or carboxyl groups are observed at the frequencies more than 9 or 35 GHz, respectively, for nanocrystals, but are not for the bulk sample of 250 nm diameter. Such Mn 2+ sites enhance the photoluminescence due to d-d transition of Mn 2+ ions through energy transfer from S 2- vacancies or carboxyl groups, excited simultaneously by a light of 350 nm for exciting ZnS. More... »

PAGES

383

Identifiers

URI

http://scigraph.springernature.com/pub.10.1557/proc-536-383

DOI

http://dx.doi.org/10.1557/proc-536-383

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1085637412


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