Pressure-dependent luminescence properties of Tb³⁺-doped K–Ba–Al fluorophosphate glass

Abstract

Tb³⁺-doped fluorophosphate glass with a composition of P₂O₅+K₂O+KF+BaO+Al₂O₃+Tb₄O₇ was prepared by melt quenching technique and characterized through emission spectra and decay curves as a function of pressure up to 37.7 GPa. The ⁵D₄→⁷F₃, ⁷F₄ and ⁷F₅ emission transitions shift toward lower energy in the order of−4.7,−2.4 and−4.0 cm⁻¹ GPa⁻¹, respectively, with increasing pressure. A strong increase in the splitting of the ⁵D₄→⁷F₅ Stark levels with pressure is observed. The decay curves for the ⁵D₄ level are found to be almost perfectly single exponential in the entire pressure range studied. Lifetimes of the ⁵D₄ level are found to decrease strongly from 2564 to 886 μs when pressure is increased from ambient to 37.7 GPa. The pressure dependence of all the derived values of the present study is compared with Tb³⁺ in other glasses.

^†This paper was presented at the XLVI^th European High Pressure Research Group (EHPRG 46) Meeting, Valencia (Spain), 7–12 September, 2008.

Keywords:

• RE³⁺ ion in glass matrices
• optical properties
• crystal-field
• high pressure

Acknowledgements

This work has been carried out under the financial assistance of a major research project sponsored by DAE-BRNS, Government of India (No. 2007/34/25-BRNS/2415, dt. 18-01-2008). One of the authors, C.K. Jayasankar, is grateful to Department Physik, Universität Paderborn, Germany, for his stay as a Guest Scientist.

Notes

^†This paper was presented at the XLVI^th European High Pressure Research Group (EHPRG 46) Meeting, Valencia (Spain), 7–12 September, 2008.