Lutetium aluminum garnet, commonly known as LuAG, is a versatile material finding numerous optical applications, and whose scintillation properties have been widely investigated. In this study, experimental evidences of optically stimulated luminescence (OSL) phenomena occurring in LuAG:Ce crystals are shown. After demonstrating the possibility to optically bleach an electron trap responsible for a thermally stimulated luminescence (TSL) peak at 280 C (heating rate 1.7 Cs1) using red light, a direct measurement of the OSL decay curve and of the resulting characteristic Ce3þ 5d-4f emission spectrum is carried out. The assessment of the bleaching spectrum of the TSL peak at 280 C reveals that light with wavelength in the 600–650nm interval is the most efficient in depleting the TSL peak, making He-Ne lasers suitable sources of optical stimulation. The finding of OSL features in LuAG: Ce paves the way to new application perspectives. In particular, the achievement of a good balance between scintillation and energy storage properties of LuAG.Ce can drive a constructive integration between X-rays imaging approaches based on photo-stimulable phosphors and those exploiting scintillating materials.

Evidence of Optically Stimulated Luminescence in Lu3Al5O12:Ce / S. Gallo, I. Veronese, A. Vedda, M. Fasoli. - In: PHYSICA STATUS SOLIDI. A, APPLICATIONS AND MATERIALS SCIENCE. - ISSN 1862-6319. - (2019 Apr 26). [Epub ahead of print] [10.1002/pssa.201900103]

Evidence of Optically Stimulated Luminescence in Lu3Al5O12:Ce

S. Gallo
Primo
;
I. Veronese
;
2019-04-26

Abstract

Lutetium aluminum garnet, commonly known as LuAG, is a versatile material finding numerous optical applications, and whose scintillation properties have been widely investigated. In this study, experimental evidences of optically stimulated luminescence (OSL) phenomena occurring in LuAG:Ce crystals are shown. After demonstrating the possibility to optically bleach an electron trap responsible for a thermally stimulated luminescence (TSL) peak at 280 C (heating rate 1.7 Cs1) using red light, a direct measurement of the OSL decay curve and of the resulting characteristic Ce3þ 5d-4f emission spectrum is carried out. The assessment of the bleaching spectrum of the TSL peak at 280 C reveals that light with wavelength in the 600–650nm interval is the most efficient in depleting the TSL peak, making He-Ne lasers suitable sources of optical stimulation. The finding of OSL features in LuAG: Ce paves the way to new application perspectives. In particular, the achievement of a good balance between scintillation and energy storage properties of LuAG.Ce can drive a constructive integration between X-rays imaging approaches based on photo-stimulable phosphors and those exploiting scintillating materials.
TSL; OSL; LuAG; Dosimetry
Settore FIS/01 - Fisica Sperimentale
Settore FIS/03 - Fisica della Materia
Settore FIS/07 - Fisica Applicata(Beni Culturali, Ambientali, Biol.e Medicin)
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/642935
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