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Crystallization and up-conversion luminescence properties of Er3+/Yb3+-doped NaYF4-based nano-glass-ceramics

: Pablos-Martín, A. de; Méndez-Ramos, J.; Del-Castillo, J.; Durán, A.; Rodríguez, V.D.; Pascual, M.J.


Journal of the European Ceramic Society 35 (2015), Nr.6, S.1831-1840
ISSN: 0955-2219
Fraunhofer IWM ()

A crystainization study of Er3+/Yb3+-doped NaYF4-based nano-glass-ceramics and their optical characterisation is presented. NaYF4 nano-crystals were precipitated from heat treatments close to the glass transition temperature. The crystallization process occurs from a constant number of nuclei. The increase of dopant ions has a nucleating effect. Crystal growth is limited with the length of the heat treatment, keeping the crystal size to the nanometric scale. Er3+-single doped samples show a predominant green up-conversion emission under near infrared excitation at 980 nm, while a predominant red emission is observed in the Er3+/Yb3+ co-doped samples. The efficiency of the up-conversion emission is higher in the glass-ceramics than in the parent glasses.