Doped Bi4Ge3O12 (BGO) fiber single crystals were grown by the micro-pulling-down method with the resistance heating system. Optical absorption measurements before and after x-ray irradiation (induced absorption) were performed in order to investigate the radiation damage of the crystals. The Eu3+doped BGO has shown higher radiation resistance with respect to the equivalently grown undoped BGO fibers. Radio- and photoluminescence characteristics were obtained to clarify the role of Eu3 in luminescence and scintillation mechanism. Radioluminescence spectra show the intense and slow (decay time of 1.61 ms) D-5(0,1)-F-7(x)(x=0-6) radiative transitions of Eu3, while the intrinsic BGO emission becomes weaker with respect to the undoped BGO. Photoluminescence decay of the intrinsic BGO emission becomes nonexponential and noticeably faster in Eu-doped samples, which evidences the nonradiative energy transfer from intrinsic emission centers to Eu3 ions. Thermally stimulated luminescence (TSL) measurements above room temperature prove that Eu3 doping strongly influences the concentration of TSL active traps. (C) 2003 American Institute of Physics.
Shim, J., Yoshikawa, A., Bensalah, A., Fukuda, T., Solovieva, N., Nikl, M., et al. (2003). Luminescence, radiation damage, and color center creation in Eu3+doped Bi4Ge3O12 fiber single crystals. JOURNAL OF APPLIED PHYSICS, 93(9), 5131-5135 [10.1063/1.1563816].
Luminescence, radiation damage, and color center creation in Eu3+doped Bi4Ge3O12 fiber single crystals
VEDDA, ANNA GRAZIELLA;
2003
Abstract
Doped Bi4Ge3O12 (BGO) fiber single crystals were grown by the micro-pulling-down method with the resistance heating system. Optical absorption measurements before and after x-ray irradiation (induced absorption) were performed in order to investigate the radiation damage of the crystals. The Eu3+doped BGO has shown higher radiation resistance with respect to the equivalently grown undoped BGO fibers. Radio- and photoluminescence characteristics were obtained to clarify the role of Eu3 in luminescence and scintillation mechanism. Radioluminescence spectra show the intense and slow (decay time of 1.61 ms) D-5(0,1)-F-7(x)(x=0-6) radiative transitions of Eu3, while the intrinsic BGO emission becomes weaker with respect to the undoped BGO. Photoluminescence decay of the intrinsic BGO emission becomes nonexponential and noticeably faster in Eu-doped samples, which evidences the nonradiative energy transfer from intrinsic emission centers to Eu3 ions. Thermally stimulated luminescence (TSL) measurements above room temperature prove that Eu3 doping strongly influences the concentration of TSL active traps. (C) 2003 American Institute of Physics.
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