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Study on the effects of 5d energy locations of Ce3+ ions on NIR quantum cutting process in Y2SiO5: Ce3+, Yb3+
Tang, Jinke Zhou, Wenli Yang, Jie Wang, Jing Li, Ye Kuang, Xiaojun Liang, Hongbin
Tang, Jinke
Zhou, Wenli
Yang, Jie
Wang, Jing
Li, Ye
Kuang, Xiaojun
Liang, Hongbin
Abstract
Description
The effects of the 5d energy locations of Ce3+ centers on the NIR quantum cutting process were studied in Y2SiO5 with two different substitutional Y3+ lattice sites for Ce3+ and Yb3+. Powder XRD and Rietveld refinement were used to characterize phase purity, crystal structure, lattice parameters and occupation fractions of Y2-x-yCexYbySiO5 (x = 0.002 and 0.3, y = 0-0.2). PLE and PL spectra show that both kinds of Ce3+ centers in Y2-xy CexYbySiO5 can cooperatively transfer energy to Yb3+-Yb3+ ions pair. The dependence of the integrated emission intensities of Ce3+ and Yb3+, decay lifetime (τ) of Ce3+, nonradiative energy transfer rate (KCe→Yb), cooperative energy transfer efficiency (ηCET) and quantum efficiency (ηQE) on the concentration of Yb3+ ions were studied in details. More importantly, these results demonstrate that the 5d energy locations of Ce3+ ions have a great influence on NIR quantum cutting process in Ce3+-Yb3+ system: the closer they are to twice the absorption energy (~20000 cm−1) of Yb3+, the higher the cooperative energy transfer efficiency from the lowest 5d excited state of Ce3+ to the Yb3+ Yb3+ ions pair.
Date
2012-07-02
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Publisher
University of Wyoming. Libraries
Research Projects
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Keywords
Physical Sciences and Mathematics