Structural effects on Stokes and anti-Stokes luminescence of double-perovskite (Ba,Sr)2CaMoO6: Yb3+,Eu3+

Journal of Applied Physics - Tập 110 Số 1 - 2011
Shi Ye1, Yajie Li1, Dechao Yu1, Zhongmin Yang1, Qinyuan Zhang1
1MOE Key Lab of Specially Functional Materials and Institute of Optical Communication Materials, South China University of Technology , Guangzhou 510641, People’s Republic of China

Tóm tắt

This paper deals with the investigation of structural effects on Stokes and anti-Stokes luminescence properties of double-perovskite (Ba,Sr)2CaMoO6: Eu3+,Yb3+. It is found that the tilting of the (Ca/Mo)O6 octahedra framework favors energy transfer from the MoO6 group to Eu3+/Yb3+ at the B site for Stokes luminescence processes, in which the structural connectivity angle ∠Mo–O–Eu/Yb is slightly smaller than 180°. While Eu3+/Yb3+ at the A site with a structural connectivity angle ∠Mo–O–Eu/Yb of around 90° least benefits the energy transfer. The linear connectivity of Yb–O–Mo–O–Eu with or without tilting of the (Ca/Mo)O6 framework for Eu3+ and Yb3+ at the B site strongly restrains the anti-Stokes luminescence. Whereas, it shows normal anti-Stokes luminescence for Eu3+ or Yb3+ at the A site and Yb3+ or Eu3+ at the B site with ∠Yb–O–Eu of around 90°. This research may open up promising new perspectives for designing novel luminescent materials with high efficiency.

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Journal of Applied Physics

Tập 110 Số 1

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