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Influences of Mg2+ ion on dopant occupancy and upconversion luminescence of Ho3+ ion in LiNbO3 crystal |
Dai Li (代丽)a b, Xu Chao (徐超)c, Zhang Ying (张颖)a, Li Da-Yong (李大勇)a, Xu Yu-Heng (徐玉恒)c |
a School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150080, China; b Applied Science College, Harbin University of Science and Technology, Harbin 150080, China; c Department of the Applied Chemistry, Harbin Institute of Technology, Harbin 150001, China |
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Abstract The effects of a Mg2+ ion on the dopant occupancy and upconversion luminescence of a Ho3+ ion in LiNbO3 crystal are reported. The birefringence gradient of the crystal is measured to investigate the optical homogeneity. The X-ray powder diffraction spectrum and the upconversion luminescence are used to investigate defect structure and spectroscopic properties of Mg,Ho:LiNbO3. Under 808-nm excitation, blue, red, and very intense yellow-green bands are observed. Based on the energy levels of Ho3+ in LiNbO3, and the pump intensity dependence of the observed emission, an excitation scheme is presented. The upconversion emission spectra reveal an enhancement of upconversion intensity when the Mg2+ ions are introduced into Ho:LiNbO3. The main upconversion mechanism is discussed in this work.
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Received: 14 November 2012
Revised: 25 March 2013
Accepted manuscript online:
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PACS:
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42.25.Fx
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(Diffraction and scattering)
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42.65.-k
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(Nonlinear optics)
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74.25.Gz
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(Optical properties)
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Fund: Project supported by the China Postdoctoral Science Foundation (Grant No. 2012M520759 ) and the Science and Technology Research Project of Education Bureau of Heilongjiang Province, China (Grant No. 12531098). |
Corresponding Authors:
Dai Li
E-mail: daili198108@126.com
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Cite this article:
Dai Li (代丽), Xu Chao (徐超), Zhang Ying (张颖), Li Da-Yong (李大勇), Xu Yu-Heng (徐玉恒) Influences of Mg2+ ion on dopant occupancy and upconversion luminescence of Ho3+ ion in LiNbO3 crystal 2013 Chin. Phys. B 22 094201
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