High-pressure luminescence studies inCe3+:Lu2SiO5

Abstract

High pressure luminescence studies of the ${\mathrm{Ce}}^{3+}(1)$ and ${\mathrm{Ce}}^{3+}(2)$ centers in ${\mathrm{Ce}}^{3+}:{\mathrm{Lu}}_{2}{\mathrm{SiO}}_{5}$ have been completed. The studies indicate the presence of energy transfer from ${\mathrm{Ce}}^{3+}(2)$ to ${\mathrm{Ce}}^{3+}(1)$ upon selective excitation of the ${\mathrm{Ce}}^{3+}(2)$ centers. The efficiency of energy transfer was observed to increase between ambient pressure and 6 kbar and to decrease above 6 kbar. We propose a host lattice electron-hole pair mediated energy transfer mechanism in which conduction band electrons are produced by photoionization of ${\mathrm{Ce}}^{3+}(2)$ centers and valence band holes are formed by a two photon excitation process through photoionized ${\mathrm{Ce}}^{3+}(2)$ intermediates. A configuration coordinate model of the proposed energy transfer process is presented. Temperature and excitation power dependent measurements provide support for the proposed energy transfer process.