Electron-hole recombination luminescence in LiYF4: U 4+ single crystal
Journal
Radiation Measurements
Journal Volume
37
Journal Issue
6
Pages
621-626
Date Issued
2003
Author(s)
Abstract
Photoluminescence (PL), photostimulated luminescence (PSL), thermally stimulated luminescence (TSL) and electron paramagnetic resonance (EPR) studies were carried out on LiYF4:U4+ and pure LiYF4 crystals. The PL and EPR investigations have identified the presence of Eu 3+, Tb3+ and Gd3+ ions in both of these crystals possibly due to their existence in the starting materials. The luminescence observed during afterglow, PSL and TSL revealed that emission occurs at wavelength positions 382, 413, 437 and 544 nm, which are characteristic of Tb3+ ions. The present investigations using PSL and TSL in combination with PL studies before and after gamma irradiation have revealed that selective energy transfer to Tb3+ ions occurs during electron-hole recombination processes like PSL and TSL. Even though other luminescent ions (U4+ and Eu3+) are present in the system and U4+/U3+ ions are participating in electron capture/release processes, the selective energy transfer results in Tb 3+ ions acting as luminescence centers. ? 2003 Elsevier Ltd. All rights reserved.
Subjects
Energy transfer
LiYF4
Luminescence
Photo-stimulated luminescence
TSL
U-rare earths codoping
SDGs
Type
journal article