We study lutetium hafnate, Lu4Hf3O12, prepared by acetate and citrate combustion in the form of nanometric powders. Optical properties including X-ray excited luminescence, steady-state and time resolved photoluminescence as well as thermally stimulated luminescence are investigated for undoped as well as Eu3+ and Tb3+ doped samples. We identify recombination centers in the host matrix and we tentatively associate the principal emission with a radiative transition of the F + center. We also demonstrate that athermal tunneling of charge carriers between traps and recombination centers is the predominant mechanism of delayed radiative recombination following irradiation by ionizing radiation. © 2011 Elsevier B.V. All rights reserved
Mihokova, E., Fasoli, M., Lauria, A., Moretti, F., Nikl, M., Jary, V., et al. (2011). Prompt and delayed recombination mechanisms in Lu4Hf3O12 nanophosphors. OPTICAL MATERIALS, 34(1), 228-233 [10.1016/j.optmat.2011.08.021].
Prompt and delayed recombination mechanisms in Lu4Hf3O12 nanophosphors
FASOLI, MAURO;LAURIA, ALESSANDRO;MORETTI, FEDERICO;VEDDA, ANNA GRAZIELLA
2011
Abstract
We study lutetium hafnate, Lu4Hf3O12, prepared by acetate and citrate combustion in the form of nanometric powders. Optical properties including X-ray excited luminescence, steady-state and time resolved photoluminescence as well as thermally stimulated luminescence are investigated for undoped as well as Eu3+ and Tb3+ doped samples. We identify recombination centers in the host matrix and we tentatively associate the principal emission with a radiative transition of the F + center. We also demonstrate that athermal tunneling of charge carriers between traps and recombination centers is the predominant mechanism of delayed radiative recombination following irradiation by ionizing radiation. © 2011 Elsevier B.V. All rights reserved
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
