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Sensitized thulium ultraviolet upconversion luminescence in Tm 3 + Yb 3 + Nd 3 + triply doped nanoglass ceramics

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Abstract

Intense four- and five-photon ultraviolet upconversion processes through sensitization of Tm3+ ions in transparent SiO2Al2O3NaFYF3 glass ceramics triply doped with Tm3+Yb3+Nd3+ under 796nm excitation were investigated. Judd–Ofelt analyses evidenced the incorporation of rare-earth ions into the precipitated β-YF3 nanocrystals. In contrast with the triply doped one, no ultraviolet upconversion luminescence was observed in the Tm3+Nd3+ codoped glass ceramic, indicating that Yb3+ acts as bridging ions to enhance the energy transfer efficiency between Nd3+ and Tm3+. Based on the pumping power dependence of luminescence, upconversion mechanisms were proposed.

© 2007 Optical Society of America

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