Abstract
Intense four- and five-photon ultraviolet upconversion processes through sensitization of ions in transparent glass ceramics triply doped with under excitation were investigated. Judd–Ofelt analyses evidenced the incorporation of rare-earth ions into the precipitated nanocrystals. In contrast with the triply doped one, no ultraviolet upconversion luminescence was observed in the codoped glass ceramic, indicating that acts as bridging ions to enhance the energy transfer efficiency between and . Based on the pumping power dependence of luminescence, upconversion mechanisms were proposed.
© 2007 Optical Society of America
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