Honeywell

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Optical studies of CaF2:Eu crystals for scintillator and dosimeter applications
Keywords: Scintillator, CaF2:Eu crystals , Optical properties
Transparent calcium fluoride (CaF2) doped with Eu ions (CaF2:Eu) have attracted increasing interest as ionizing radiation detector. Particularly, such doped host is able to emit visible light under high-energy photons and particles excitation, resulting in a suitable material for medical diagnosis such as a scintillation phosphor or dosimeter (Nakamura et al., Dorenbos et al.). Either in the divalent or trivalent charge states, europium ions are known as efficient activators in several wide bandgap hosts, as the case of CaF2 with bandgap energy of 12.0 eV (Cadelano et al.). When optically active in CaF2, Eu2+ and Eu3+ are responsible for blue and orange/red luminescence due to 5d->4f and intra-4f6 transitions, respectively (Nakamura et al., Tsuboi et al., Dhopte et al., Xiong et al.). In the present study CaF2:Eu crystals grown by the Bridgman technique were systematically investigated through Raman spectroscopy, absorption, photoluminescence (PL), PL excitation (PLE), time resolved PL (TRPL) and lifetime measurements. Moreover, the sample luminescence dependence on temperature and excitation density was studied in order to identify the optical active defects which can hamper the scintillator material performance.
J. Cardoso,
Departamento de Física & I3N, Universidade de Aveiro
Aveiro, Aveiro
Portugal


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