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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 ,
G. Özen ,
Xu Wu ,
A. Kermaoui ,
F. Pellé  and
B. Blanzat
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 1G4 → 3H6 and 3F4 → 3H6 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.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 8 , August 1994 , pp. 2138 - 2143
Copyright
Copyright © Materials Research Society 1994

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References

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