Persistent luminescence properties of Cr^3+-Sm^3+ activated LaAlO_3 perovskite

Katayama, Yumiko; Kobayashi, Hiroaki; Ueda, Jumpei; Viana, Bruno; Tanabe, Setsuhisa

doi:10.1364/ome.6.001500

Cited by 31 publications

(13 citation statements)

References 18 publications

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“…It shows that they act as suitable electron traps like co-dopants of trivalent lanthanides ions in YPO 4 :Ce 3+ ,Ln 3+ . Again, TL is shown to be a sensitive technique to determine energy levels in the band gap and is therefore widely used in the study of persistent luminescence phosphors, as illustrated by the many publications in this field [28,29,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96]. …”

Section: Thermoluminescence As a Research Toolmentioning

confidence: 99%

Thermoluminescence as a Research Tool to Investigate Luminescence Mechanisms

Bos

2017

Materials

234

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Thermally stimulated luminescence (TSL) is known as a technique used in radiation dosimetry and dating. However, since the luminescence is very sensitive to the defects in a solid, it can also be used in material research. In this review, it is shown how TSL can be used as a research tool to investigate luminescent characteristics and underlying luminescent mechanisms. First, some basic characteristics and a theoretical background of the phenomenon are given. Next, methods and difficulties in extracting trapping parameters are addressed. Then, the instrumentation needed to measure the luminescence, both as a function of temperature and wavelength, is described. Finally, a series of very diverse examples is given to illustrate how TSL has been used in the determination of energy levels of defects, in the research of persistent luminescence phosphors, and in phenomena like band gap engineering, tunnelling, photosynthesis, and thermal quenching. It is concluded that in the field of luminescence spectroscopy, thermally stimulated luminescence has proven to be an experimental technique with unique properties to study defects in solids.

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Section: Thermoluminescence As a Research Toolmentioning

confidence: 99%

Thermoluminescence as a Research Tool to Investigate Luminescence Mechanisms

Bos

2017

Materials

234

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“…44) Ex represents the excitonic level, which is 0.5 eV below the bottom of the conduction band according to the VRBE model. 46) Journal of the Ceramic Society of Japan 125 [11] ions and the bottom of conduction band is found to be 0.75 eV for Tm, 1.22 eV for Sm, and 2.47 eV for Eu; these values are at low temperature (³10 K) [ Fig. 5(b)].…”

Section: +mentioning

confidence: 99%

Red to near-infrared persistent luminescence in transition metal ion activated phosphors

Katayama

2017

J. Ceram. Soc. Japan

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Red-to-near infrared persistent phosphors have attracted great attention because they are promising candidates for in vivo imaging. However, for most of the persistent phosphors that are activated only by ultraviolet (UV) light, the detection time is limited because persistent luminescence decays with time and UV excitation cannot be repeated due to the opacity of living tissues to UV radiation. Therefore, we have developed persistent phosphors with perovskite and garnet structures, which show 1) persistent luminescence at an optimum wavelength with high transparency for living tissue, 2) with brighter and longer persistent luminescence, and 3) with an additional function leading to long-term in vivo imaging capability.

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“…In addition, NIR-emitting phosphors have been intensively studied for bio-imaging applications in recent years. (4)(5)(6)(7)(8)(9)(10)(11) Rare-earth-doped garnet materials are of considerable interest as scintillator materials. There are a number of rare-earth-doped garnet scintillators commercially available, (12)(13)(14)(15)(16)(17) and they are characterized as having a considerably high scintillation intensity among oxide scintillators.…”

Section: Introductionmentioning

confidence: 99%

Development of NIR-Emitting Scintillators Based on Rare-Earth-Doped Garnet Crystals – Part 1

2017

Sensors and Materials

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In this paper, we report on experimental results towards the development of near-infrared (NIR)-emitting scintillators based on rare-earth-doped garnet crystals, which were obtained as a part of collaborative research with the Nuclear Power Safety Technology Research Center, Chubu Electric Power Co., Inc. A series of garnet scintillators, Y 3 Al 5 O 12 (YAG) and Y 3 Al 2 Ga 3 O 12 (YAGG) doped with rare-earth elements (Nd, Sm, Ho, Er, Tm, and Yb) at varying concentrations (0.5, 1.0, 2.0, 5.0, and 10.0 mol%), were synthesized by the floating zone method and systematically characterized for NIR-emitting scintillator applications. Among all the samples, 5% Nd-doped YAG showed the highest scintillation intensity (integration mode). By taking the spectral responsivity of the photodetector and the attenuation of optical light guide into consideration, a combination of 5% Yb-doped YAG and an InGaAs detector is expected to give the highest detectable signal. The scintillation intensity effectively depends on the photoluminescence quantum yield and energy transfer efficiency, which is effectively correlated with not the quality of the crystal but the type of rare-earth ion doped.

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Persistent luminescence properties of Cr^3+-Sm^3+ activated LaAlO_3 perovskite

Cited by 31 publications

References 18 publications

Thermoluminescence as a Research Tool to Investigate Luminescence Mechanisms

Thermoluminescence as a Research Tool to Investigate Luminescence Mechanisms

Red to near-infrared persistent luminescence in transition metal ion activated phosphors

Development of NIR-Emitting Scintillators Based on Rare-Earth-Doped Garnet Crystals – Part 1

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