Upconversion luminescence and thermal effects in terbium–ytterbium codoped fluorogermanate glass-ceramic

Author： Gouveia-Neto A. S. Bueno L. A. do Nascimento R. F. Sundheimer M. L. da Costa E. B. Ribeiro S. J. L. Messaddeq Y.

Publisher： Society of Glass Technology

ISSN： 0031-9090

Source： Physics and Chemistry of Glasses - European Journal of Glass Science and Technology Part B, Vol.50, Iss.1, 2009-02, pp. : 34-36

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Abstract

Cooperative energy transfer upconversion luminescence is investigated in Tb³⁺/Yb³⁺-codoped PbGeO₃–PbF₂–CdF₂glass-ceramic and its precursor glass under resonant and off resonance infrared excitation. Bright UV-visible emission signals around 384, 415, 438 nm, and 473–490, 545, 587, and 623 nm are identified as due to the ⁵D₃(⁵G₆)→⁷F_J (J=6,5,4) and ⁵D₄→⁷F_J (J=6,5,4,3) transitions, respectively, and readily observed. The results indicate that cooperative energy transfer between ytterbium and terbium ions followed by excited state absorption are the dominant upconversion excitation mechanisms involved. Comparison of the upconversion process in a glass-ceramic sample and its glassy precursor revealed that the former present much higher upconversion efficiency. The dependence of the upconversion emission upon pump power, temperature, and doping content is also examined.