Effect of pressure on luminescence properties ofCe3+:Lu2S3

We report the effect of pressure on $d\ensuremath{\rightarrow}f$ luminescence properties of ${\mathrm{Ce}}^{3+}{:\mathrm{L}\mathrm{u}}_{2}{\mathrm{S}}_{3}$ up to \ensuremath{\sim}300 kbar. We observed that the $d\ensuremath{\rightarrow}f$ luminescence upon compression exhibited a large redshift in energy and a strong quenching in intensity. The pressure-induced redshift was explained by an increased crystal-field strength and nephelauxetic effect. We attributed the pressure-induced quenching in the intensity to a pressure-induced crossing of the conduction band edge of ${\mathrm{Lu}}_{2}{\mathrm{S}}_{3}$ and the emitting $5d$ state of ${\mathrm{Ce}}^{3+}$ on the basis of temperature-dependent luminescence intensity measurements. A quantitative analysis of the temperature dependence at several pressures was completed and analyzed using a photoionization model. Excellent agreement of the model with the experimental results was found.