Optical and scintillation properties of Cd-doped ZnO film

Yanagida, Takayuki; Fujimoto, Yutaka; Miyamoto, Miyuki; Sekiwa, Hideyuki

doi:10.7567/jjap.53.02bc13

Cited by 28 publications

(31 citation statements)

References 36 publications

(37 reference statements)

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“…The intrinsic luminescence represents free-exciton luminescence, self-trapped exciton (STE) luminescence, Auger free luminescence and self-activation luminescence. The free exciton luminescence is observed in wide band-gap semiconductor materials having direct transitions; common examples are ZnO 41–43) and GaN. 44) Scintillation due to free exciton is characterized by fast scintillation decay with a sharp emission peak in the spectrum.…”

Section: Recent Randd Progress Of Scintillatorsmentioning

confidence: 99%

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Inorganic scintillating materials and scintillation detectors

Yanagida

2018

Proceedings of the Japan Academy. Ser. B: Physical and Biologic

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366

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Scintillation materials and detectors that are used in many applications, such as medical imaging, security, oil-logging, high energy physics and non-destructive inspection, are reviewed. The fundamental physics understood today is explained, and common scintillators and scintillation detectors are introduced. The properties explained here are light yield, energy non-proportionality, emission wavelength, energy resolution, decay time, effective atomic number and timing resolution. For further understanding, the emission mechanisms of scintillator materials are also introduced. Furthermore, unresolved problems in scintillation phenomenon are considered, and my recent interpretations are discussed. These topics include positive hysteresis, the co-doping of non-luminescent ions, the introduction of an aimed impurity phase, the excitation density effect and the complementary relationship between scintillators and storage phosphors.

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Section: Recent Randd Progress Of Scintillatorsmentioning

confidence: 99%

“…In addition, Zn has a low cross-section to γ-rays and neutrons. Up to now, we have developed some ZnO film scintillators, 132) and have demonstrated α-ray real time imaging by using ZnO. 133) …”

Section: Recent Randd Progress Of Scintillatorsmentioning

confidence: 99%

Inorganic scintillating materials and scintillation detectors

Yanagida

2018

Proceedings of the Japan Academy. Ser. B: Physical and Biologic

Self Cite

366

167

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“…On the other hand, those consisting of light elements are appropriate for measuring charged particles such as α-rays since the sensitivity for background X-rays and γ-rays must be low. (4) In addition, RE ions are often included in the host material in order to enhance the luminescence properties. (5) In this study, we have synthesized undoped and RE-doped 12CaO·7Al 2 O 3 (RE:C12A7) single crystals and characterized the properties for scintillator applications.…”

Section: Introductionmentioning

confidence: 99%

Optical and Scintillation Properties of Rare-Earth Ion-Doped 12CaO·7Al2O3 Single Crystals

2017

Sensors and Materials

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We have synthesized undoped and rare-earth (RE)-doped 12CaO·7Al 2 O 3 (RE:C12A7) crystals by the floating zone (FZ) method to systematically study the effects of RE doping (doped with all the lanthanoid elements except for Sc, Y, La, Pm, and Lu) in C12A7 for radiation detector applications. In both photoluminescence (PL) and scintillation, the undoped C12A7 crystal showed a weak emission due to the lattice defects appearing at around 500 nm, and the decay time was on the order of several nanoseconds. On the other hand, the RE:C12A7 crystals showed PL and scintillation owing to the 4f-4f transitions of RE 3+ ions appearing from the UV to NIR ranges depending on the RE element. The decay times of these emissions ranged from a few microseconds to milliseconds depending on the RE element and the values were typical for the electronic transitions of trivalent rare earths.

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“…(20) The lifetime (about 4 ns) of the UV emission band is fairly shorter than that (about 220 ns) of the main emission band in a commercially available Ag-doped ZnS scintillator. (18) To fabricate a ZnO scintillator emitting only UV light, ZnO (purity: 4N) phosphors doped with impurities such as CuO, Al 2 O 3 , In 2 O 3 , and Ga 2 O 3 were prepared using the SPS method.…”

Section: Pl Characteristics Of Undoped Zno and Impurity-doped Zno Phomentioning

confidence: 95%

Luminescence Properties of Impurity-Doped Zinc Oxide Phosphor for Novel Neutron Detection

2016

Sensors and Materials

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A neutron detection sheet composed of Ag-doped zinc sulfide (ZnS) as a scintillator and 6 LiF as a neutron converter has been conventionally used for neutron detection, and as an imaging detector using the photon counting method, because of its high luminescence rate for neutrons. However, the weak point in a Ag-doped ZnS scintillator is the slow component of its lifetime. Thus, we began to investigate other II-VI compound phosphors without the slow component of its lifetime for neutron detectors using the photon counting method. In this study, Cu-, In-, Al-, and Gaimpurity-doped ZnO phosphors without the slow component of lifetime for neutron detectors at a high counting rate have been fabricated using a spark plasma sintering method. It was found that Ga-doped ZnO exhibited the highest intensity of luminescence at a wavelength of 383 nm. The intensity of the 383 nm luminescence due to exciton emission with a lifetime of about 4 ns was comparable to that of the Ag-doped ZnS phosphor with a lifetime of about 220 ns, indicating that the Ga-doped ZnO phosphor could be used as a promising phosphor material for a neutron image sensor. It was also found that the luminescence intensity of the Ga-doped ZnO phosphor samples did not decrease when B 2 O 3 was added as a neutron-alpha (n, alpha) converter. It was confirmed that a Ga-doped ZnO scintillator with B 2 O 3 converter responds to the neutron beam emitted by the Japan Research Reactor-3 (JRR-3).

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Optical and scintillation properties of Cd-doped ZnO film

Cited by 28 publications

References 36 publications

Inorganic scintillating materials and scintillation detectors

Inorganic scintillating materials and scintillation detectors

Optical and Scintillation Properties of Rare-Earth Ion-Doped 12CaO·7Al2O3 Single Crystals

Luminescence Properties of Impurity-Doped Zinc Oxide Phosphor for Novel Neutron Detection

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