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Compositional dependence of infrared to blue and red conversion luminescence in oxyfluoride glass-ceramics co-doped with Tm3+ and Yb3+ ions

Published online by Cambridge University Press:  03 March 2011

J.P. Denis
Affiliation:
Laboratoire de Physico-Chimie des Matériaux, C.N.R.S. (UPR-211) 92190 Meudon, France
G. Özen
Affiliation:
Laboratoire de Physico-Chimie des Matériaux, C.N.R.S. (UPR-211) 92190 Meudon, France
Xu Wu
Affiliation:
Laboratoire de Physico-Chimie des Matériaux, C.N.R.S. (UPR-211) 92190 Meudon, France
A. Kermaoui
Affiliation:
Laboratoire de Physico-Chimie des Matériaux, C.N.R.S. (UPR-211) 92190 Meudon, France
F. Pellé
Affiliation:
Laboratoire de Physico-Chimie des Matériaux, C.N.R.S. (UPR-211) 92190 Meudon, France
B. Blanzat
Affiliation:
Laboratoire de Physico-Chimie des Matériaux, C.N.R.S. (UPR-211) 92190 Meudon, France
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Abstract

The upconversion of infrared radiation into visible light has been studied in heavy metal oxyfluoride glass-ceramics co-doped with Yb3+ and Tm3+ ions at 300 K. The general composition of the compounds is 69.9PbF2 + 7.5WO3 + 7.5MO2 + 15YbF3 + 0.1TmF3 (M = Si, Ge, Zr, Te, and Th). Two main upconversion emissions were observed. They are centered at 477 and 775 nm, corresponding to the 1G43H6 and 3F43H6 transitions, respectively. Slopes of the emission intensity versus excitation power measurements indicate that the blue emission is due to three-photon absorption, while two-photon absorption processes are responsible for the red emission. A comparative method was used to measure the upconversion efficiencies under 16.5 mW/cm2 excitation power. Measurements were made after the compounds were annealed at 450 °C for 4 h. The best conversion efficiencies were obtained for the compound having silicon (Si). They are 28 × 10−6 for the blue and 18 × 10−2 for the red emission.

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Articles
Copyright
Copyright © Materials Research Society 1994

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References

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