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Synthesis and tunable photoluminescence of NaYF4:Eu/Ba nanocrystals

Published online by Cambridge University Press:  31 January 2011

Guofeng Wang  and
Qing Peng
Guofeng Wang
Affiliation:
Department of Chemistry and State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing, 100084 China
Qing Peng*
Affiliation:
Department of Chemistry and State Key Laboratory of New Ceramics and Fine Processing, Tsinghua University, Beijing, 100084 China
*
a)Address all correspondence to this author. e-mail: pengqing@tsinghua.edu.cn
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Abstract

Sub-10 nm monodispersed NaYF4:Eu/Ba nanocrystals were synthesized by a hydrothermal method. Under 396-nm excitation, in addition to the characteristic emissions of Eu3+ ions, an intense emission band originating from the d–f transition of the Eu2+ ions is also observed, indicating that Eu3+ and Eu2+ coexist in Eu/Ba-codoped NaYF4 nanocrystals. The dependence of the luminescence on the Ba2+ concentration was studied. Tunable photoluminescence of NaYF4:Eu nanocrystals was successfully achieved by codoping with Ba2+ ions. In addition, when the Ba/Ln ratio is 3:7 and 4:1, pure cubic Ba0.92Y2.15F8.29:Eu and tetragonal BaYF5:Eu nanocrystals were obtained, respectively.

Keywords

LuminescenceNanoscale
Type
Articles
Information
Journal of Materials Research , Volume 25 , Issue 12 , December 2010 , pp. 2422 - 2425
Copyright
Copyright © Materials Research Society 2010

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