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Optical and scintillation properties of Nd-doped SrAl2O4 crystals

Journal of Rare Earths 2016年第8期34卷 757-762页

作者： daisuke nakauchi Go Okada Masanori Koshimizu Takayuki Yanagida Graduate School of Materials Science.Nara Institute of Science and Technology(NAIST)8916-5 Takayama-cho lkoma-shiNara 630-0192Japan Department of Applied Chemistry Graduate School of EngineeringTohoku University 6-6-07 AobaAramakiAoba-ku.Sendai 980-8579.Japan

Nd-doped SrA1204 （Nd：SrA1204） crystals were prepared by a floating zone （FZ） method with different dopant concentra- tions. The photoluminescence （PL） measurements under visible light excitations confirmed strong near infrared （NIR） emissions around 890 nm, which is due to the 4f-4f transitions of Nd3＋, and the decay time constants were 300-400 μs. Furthermore, VUV ex- citations revealed two broad emissions around 250450 and 500-700 run, which were attributed to self-trapped excitons （STEs） perturbed by Nd3＋. Moreover, the X-ray induced scintillation spectra showed some small peaks at around 380 nm in addition to NIR emissions at 1064 nm similarly seen in PL. The former scintillation decay time constants were 30-40 Its. In the undoped sample, these emissions mentioned above were not present but a weak broad emission around 450 nm appeared. In thermally stimulated lu- minescence （TSL） after X-ray irradiation, strong TSL glow peaks were observed in the Nd-doped samples at around 100 and 250 ℃.

关键词： scintillation photoluminescence storage luminescence single crystal rare earths

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Photoluminescence, scintillation and thermally-stimulated luminescence properties of Tb-doped 12CaO·7Al2O3 single crystals grown by FZ method

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Journal of Rare Earths 2017年第10期35卷 957-963页

作者： Narumi Kumamoto daisuke nakauchi Takumi Kato Go Okada Noriaki Kawaguchi Takayuki Yanagida Graduate School of Materials Science Nara Institute of Science and Technology (NAIST) 8916-5 Takayama-cho Ikoma-shi Nara 630-0192 Japan

Tb-doped 12CaO·7Al_2O_3（Tb：C12A7） crystals were synthesized by the floating zone（FZ） method and the photoluminescence（PL）, scintillation and thermally-stimulated luminescence（TSL） properties were investigated. The photoluminescence（PL） emission spectra and PL decay time profiles were investigated by using Quantaurus-tau（Hamamatsu）. The scintillation spectra and decay time profiles were measured by using our laboratory-constructed set-up under X-ray irradiation. Finally, TSL glow curve was measured by using Nanogray TL-2000 with the heating rate of 1 °C/s. In PL and scintillation, emission peaks were observed at 493, 543, 587 and 620 nm due to the 4f-4f transitions of Tb3~＋. Decay time constants of the emission by PL and scintillation appeared to be different, and the measured values were approximately 2.4 and 1.9 ms, respectively. After X-ray irradiations, the 0.5%（all Tb contents in this paper are in mole fraction） and 1.0% Tb-doped samples showed a single intense and broad glow peak around 100 oC while 1.2%–1.5% Tb-doped samples showed notable additional peak around 250 oC.

关键词： C12A7 single crystal FZ terbium scintillation photoluminescence TSL rare earths

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