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Photo- and radio- luminescence characterizations in rare-earth-doped SrAl2O4 crystals
Daisuke Nakauchi,Masanori Koshimizu,Noriaki Kawaguchi,Takayuki Yanagida 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.4
SrAl2O4 bulk crystals doped with all rare-earth (RE) ions except for Sc, Y, La, Pm and Lu were synthesized by the optical floating zone method to systematically investigate the photoluminescence (PL) and radioluminescence (RL) properties for radiation detector applications. The crystal samples show PL and RL signals due to the 5d-4f or 4f-4f transitions of doped RE ions, and each decay curve consists of a sum of exponential functions with the typical decay time constants. Under VUV photon excitation, the Ce-, Pr-, Eu-, Tb-, Dy- and Ho-doped samples exhibit PL predominantly with two broad emission bands around 320 and 600 nm, which are possibly due to self-trapped excitons (STEs) perturbed by RE ions.
Radio-photoluminescence properties of CaF2 transparent and opaque ceramics
Kato Takumi,Nakauchi Daisuke,Kawaguchi Noriaki,Yanagida Takayuki 한국물리학회 2020 Current Applied Physics Vol.20 No.11
Radio-photoluminescence (RPL) phenomenon was observed in CaF2 transparent and opaque ceramics by X-ray irradiation. The RPL appeared as a formation of photoluminescence (PL) emission bands located around 660 and 720 nm caused by F2+ and (F2+)A centers, respectively. The RPL signal can be deleted by heating, and reusability was observed over ten experimental cycles. The fading of the RPL signal was confirmed to be ~4% in 10 days. The detectable RPL response of CaF2 transparent ceramics was as low as 1 mGy, and the dynamic ranges were confirmed over 1–10000 mGy with linear response.
Scintillation and photoluminescence properties of Prdoped CaHfO3 crystals
Hiroyuki Fukushima,Daisuke Nakauchi,Noriaki Kawaguchi,Takayuki Yanagida 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.3
Pr-doped CaHfO3 bulk crystals were synthesized by the floating zone method, and the luminescence properties wereinvestigated. We confirmed that all the samples have a single phase of CaHO3 by XRD measurement. The undoped sampleindicate a broad emission around 440 nm and fast decay time constant due to the host while the Pr-doped samples show sharppeaks and slow decay time constants due to the 4f-4f transitions of Pr3+. By Pr-doping, the afterglow level became worse thanthat of the undoped one while the dense Pr-doping can suppress the afterglow.