Effect of high pressure on photoluminescence properties of Eu3+: K–Ba–Al–fluorophosphate glasses

The effect of hydrostatic pressure and active ion concentration on the luminescence spectra and lifetimes of Eu3+-doped P2O5–K2O–BaO–Al2O3–KF glasses have been studied up to 44.8 GPa at room temperature. The 5D0 → 7F0–3 transitions exhibit pressure induced red-shift with different magnitudes. The crystal-field (CF) strengths at ambient condition are 338, 332 and 350 cm−1 for 0.05 mol%, 2.0 mol% and 6.0 mol% Eu2O3-doped glasses, respectively. These values slowly increase with increasing pressure and finally reach 518, 410 and 381 cm−1 at the highest pressure. The observed increase in the CF strength parameter is found to have an almost cubic dependence on pressure. The luminescence intensity ratio, 5D0 → 7F2/5D0 → 7F1, of the Eu3+ ions is found to decrease with increasing pressure. The decay curves follow single exponential nature for all the three concentrations of Eu2O3-doped glasses for the entire pressure range studied.

Research highlightsThe effect of hydrostatic pressure on the luminescence spectra and lifetimes of Eu3+-doped P2O5–K2O–BaO–Al2O3–KF glasses have been studied up to 44.8 GPa at room temperature for three different concentrations. Obtaining photoluminescence signal at high pressure of 44.8 GPa is very difficult but we are able to collect good quality of data up to 44.8 GPa.