title: Spectroscopic analysis of LYSO:Ce crystals.
abstract: Rare earth orthosilicates are among the most widely used scintillator materials in the last decades. Particularly, lutetium-yttrium oxyorthosilicate (LYSO) is known to exhibit great potentialities in the field of radiation detectors for medical imaging. Consequently, an in-depth knowledge of the material properties is of utmost interest for the mentioned applications. In this work the spectroscopic properties of commercial cerium doped lutetium-yttrium oxyorthosilicate crystals (LYSO:Ce) were investigated by Raman spectroscopy, steady state photoluminescence, photoluminescence excitation and time resolved photoluminescence. Site selective excitation was used under steady state (325nm) and pulsed (266nm) conditions to separately investigate the temperature dependence of the 5d→4f Ce1and Ce2luminescence, allowing to establish the thermal quenching dependence of the Ce2optical center. In the case of the Ce1optical center, a luminescence quantum efficiency of 78% was obtained from 14K to room temperature with 266nm photon excitation.
authors.affiliation: Department of Physics & I3N, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
authors.forename: A F
authors.initials: AF
authors.lastname: Martins
authors.affiliation: Department of Physics & I3N, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
authors.forename: J F C
authors.initials: JF
authors.lastname: Carreira
authors.affiliation: Department of Physics & I3N, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal. Electronic address: joana.catarina@ua.pt.
authors.forename: J
authors.initials: J
authors.lastname: Rodrigues
authors.affiliation: Department of Physics & I3N, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
authors.forename: N Ben
authors.initials: NB
authors.lastname: Sedrine
authors.affiliation: Department of Physics & I3N, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
authors.forename: I F C
authors.initials: IF
authors.lastname: Castro
authors.affiliation: Department of Physics & I3N, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
authors.forename: P M M
authors.initials: PM
authors.lastname: Correia
authors.affiliation: Department of Physics & I3N, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
authors.forename: J F C A
authors.initials: JF
authors.lastname: Veloso
authors.affiliation: Department of Physics & I3N, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
authors.forename: L
authors.initials: L
authors.lastname: Rino
authors.affiliation: Department of Physics & I3N, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
authors.forename: T
authors.initials: T
authors.lastname: Monteiro
keywords: Ce; LYSO; Luminescence; Raman spectroscopy; Time resolved photoluminescence