High-pressure luminescence studies in Ce3+:Lu2SiO5 -: art. no. 195112

High pressure luminescence studies of the Ce3+(1) and Ce3+(2) centers in Ce3+:Lu2SiO5 have been completed. The studies indicate the presence of energy transfer from Ce3+ (2) to Ce3+(1) upon selective excitation of the Ce3+ (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 Ce3+ (2) centers and valence band holes are formed by a two photon excitation process through photoionized Ce3+ (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.