Eu-doped KCl phosphor crystals as a storage material for two-dimensional ultraviolet-ray or x-ray imaging sensors

Nanto, Hidehito; Endo, Fumitaka; Hirai, Yukio; Nasu, Shōichi; Taniguchi, Shin‐ichi; Takeuchi, Nozomu

doi:10.1063/1.356621

Cited by 44 publications

(16 citation statements)

References 10 publications

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“…(12)(13)(14)(15) In this work, however, we have found that AlN ceramic platea are also sensitive to UV light and show photochromism, TSL, and OSL effects upon UV exposure. Earlier studies have reported that some inorganic solids have shown UV-induced photochromism (16) and storage phosphor properties; (17,18) however, as far as we are aware, there are not many materials reported to show both of these phenomena. Unlike the properties of photographic films, these UV-induced effects do not require post-treatment such as a developing process.…”

Section: Introductionmentioning

confidence: 89%

Photochromism and Thermally and Optically Stimulated Luminescences of AlN Ceramic Plate for UV Sensing

2016

Sensors and Materials

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We have characterized AlN ceramic plates (SHAPAL ® , Tokuyama Corporation, Japan) for UV sensing applications. The SHAPAL ® AlN ceramic plate is a commercially available product used as a heat sink, but it shows photochromic effects and thermally and optically stimulated luminescences (TSL and OSL) after it is exposed to UV light. Upon UV exposure, a broad optical absorption band is induced in the UV-blue region (2.5-4.5 eV), and the color changes from gray to orange. A UVexposed AlN ceramic plate emits near UV light (~3.4 eV) upon thermal or optical stimulation. The TSL signal showed maximum intensity when heated to around 200 °C, whereas the OSL could be stimulated by light exposure over a wide spectral range from ~2 to 3 eV. The sensitivity of the photochromism, TSL, and OSL depended on the UV photon energy. Overall, these UV-induced effects were strongly pronounced for photon energies higher than 4.0 eV, but the photochromic effect could be seen for lower energies, though the signal was considerably smaller. The AlN ceramic plate could be used for UV sensing multiple times. The photochromic, TSL, and OSL signals could be erased by heat treatment, and the OSL signal could also be erased by exposure to low-energy light.

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Section: Introductionmentioning

confidence: 89%

Photochromism and Thermally and Optically Stimulated Luminescences of AlN Ceramic Plate for UV Sensing

2016

Sensors and Materials

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“…Nanto et al [8] have obtained an interesting result concerning the mechanism of the PSL in Eu-doped potassium chloride (KC1: Eu) photostimulable phosphor, on which Takahashi's model is based. They have observed remarkable PSL with a peak at about 420 nm when an X-ray irradiated KC1 : ELI single crystal phosphor was stimulated with about 560 nm light.…”

Section: Mechanism Of the Psl Phenomenonmentioning

confidence: 98%

Photostimulated luminescence in insulators and semiconductors

Nanto

1998

Radiation Effects and Defects in Solids

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This survey of photostimulated luminescence (PSL) has three main thrusts: mechanism, storage phosphors as materials of the imaging plate materials and application to radiation dosimetry. In the light of the survey, it can be said that the imaging plate utilizing the PSL in alkali halide insulating phosphors or IILlV compound semiconducting phosphors is one of the most attractive candidates for a novel two-dimensional dosimeter for ionizing radiations.

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“…KCl:Eu 2+ , CsBr:Eu 2+ , RbBr:Tl + , etc., phosphors have shown characteristic features of photostimulable X-ray storage phosphors [3][4][5]. In Eu 2+ ions-doped alkali halide crystals the 4f 7 -4f 6 5d transition results in a bell-shaped absorption between 240 and 260 nm and a broad absorption between 330 and 390 nm with a staircase structure [1].…”

Section: Introductionmentioning

confidence: 99%