| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Blue Upconversion Luminescence in Tm3+/Yb3+ Codoped CaWO4 Polycrystals |
| XU Yan-Ling1**, WANG Yun-Long1, SHI Lian-Sheng2**, TAN Xiang1 |
1Department of Chemistry, Harbin Institute of Technology, Harbin 150001
2Department of Material and Science Engineering, Harbin University of Science and Technology, Harbin 150080
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| Cite this article: |
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XU Yan-Ling, WANG Yun-Long, SHI Lian-Sheng et al 2013 Chin. Phys. Lett. 30 084207 |
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Abstract We investigate the upconversion emission of CaWO4:Tm3+/Yb3+ polycrystals prepared by the high-temperature solid-state method. The crystal structure of the polycrystals is characterized by means of x-ray diffraction. Under the excitation of a 980 nm continuous wave diode laser, the samples show intense blue upconversion emissions centered at 473 nm, corresponding to the 1G4→3H6 transition of Tm3+. The dependence of the upconversion emission intensity on the pump power of a laser diode is measured, and the results indicate that the two-photon and three-photon processes contribute simultaneously to the blue upconversion emissions. The possible multi-photon upconversion process and upconversion mechanisms are discussed.
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Received: 20 March 2013
Published: 21 November 2013
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