1. Preparation, Structure, and Up-Conversion Luminescence of Yb3+/Er3+ Codoped SrIn2O4 Phosphors.
- Author
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Guan, Ming, Zheng, Hong, Mei, Lefu, Molokeev, Maxim S., Xie, Jing, Yang, Tao, Wu, Xiaowen, Huang, Saifang, Huang, Zhaohui, and Setlur, A.
- Subjects
LUMINESCENCE ,DOPING agents (Chemistry) ,PHOTOCATALYSTS ,PHOSPHORS ,CHEMICAL synthesis ,GROUND state energy ,COMPARATIVE studies - Abstract
SrIn
2 O4 , which shows lower phonon energy than CaIn2 O4 , is not only a good photocatalyst but also can be an excellent up-conversion (UC) host to exhibits UC luminescence. In this work, Yb3+ and/or Er3+ doped SrIn2 O4 phosphors were synthesized, and their UC luminescence properties were studied and compared with those in the CaIn2 O4 host. The structure of SrIn2 O4 : 0.01Er3+ and SrIn2 O4 : 0.1Yb3+ /0.01Er3+ samples were refined by the Rietveld method and found to that SrIn2 O4 : 0.1Yb3+ /0.01Er3+ showed increasing unit cell parameters and cell volume, indicating In3+ sites were substituted successfully by Yb3+ and/or Er3+ ions. From the UC luminescence spectra and diffuse reflection spectra, Er3+ -doped SrIn2 O4 showed very weak luminescence due to ground state absorption of Er3+ ; Yb3+ /Er3+ codoped SrIn2 O4 presented strong green (550 nm) and red (663 nm) UC emissions which were assigned to energy transfer from Yb3+ transition2 F7/2 →2 F5/2 to the Er3+ transition4 S3/2 →4 I15/2 and4 F9/2 →4 I15/2 . Comparing with CaIn2 O4 , Yb3+ /Er3+ codoped SrIn2 O4 showed obvious advantages with higher UC luminescent intensity. The pumping powers study showed that UC emissions in Yb3+ /Er3+ codoped SrIn2 O4 were attributed to energy transfer of Yb3+ →Er3+ with a two-photon process. The possible UC luminescent mechanism of Yb3+ /Er3+ -doped SrIn2 O4 was discussed. [ABSTRACT FROM AUTHOR]- Published
- 2015
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