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Luminescence of nanocrystalline ZnS:Pb2+

Published online by Cambridge University Press:  21 March 2011

Ageeth A. Bol  and
Andries Meijerink
Ageeth A. Bol
Affiliation:
Debye Institute, Physics and Chemistry of Condensed Matter, Utrecht UniversityP.O. Box 80 000, 3508 TA Utrecht, The Netherlands Fax: +31 30 253 2403E-mail: a.a.bol@phys.uu.nl
Andries Meijerink
Affiliation:
Debye Institute, Physics and Chemistry of Condensed Matter, Utrecht UniversityP.O. Box 80 000, 3508 TA Utrecht, The NetherlandsFax: +31 30 253 2403
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Abstract

Nanocrystalline ZnS:Pb2+ is synthesized via a precipitation method. The luminescence is studied and the influence of the size of the nanocrystals on the luminescence properties is investigated. Nanocrystalline ZnS:Pb2+ shows a white emission under UV excitation. At least two luminescence centers are involved. One center is identified as a Pb2+ ion located on a regular Zn2+ site and gives a red emission under 480 nm excitation. The luminescence properties of this emission are characteristic for transitions on Pb2+ ions. The other centers are not as well defined and give a broad green emission band under 380 nm excitation and also show luminescence properties typically observed for Pb2+. The green emission probably originates from a charge-transfer like D-band emission of Pb2+ in ZnS close to a defect (e.g. an S2− vacancy or an O2− ion on an S2− site). A relation between the temperature quenching of the emissions and the band gap is observed and indicates that photoionization occurs.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 667: Symposium G – Luminescence and Luminescent Materials , 2001 , G4.7
Copyright
Copyright © Materials Research Society 2001

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References

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