Photo- and Radioluminescence Properties of Eu3+-doped Y2O3 Thick Film Phosphor Prepared via Chemical Vapor Deposition

Matsumoto, Shogen; Watanabe, Taiga; Ito, Akihiko

doi:10.18494/sam3698

Cited by 10 publications

(9 citation statements)

References 31 publications

(35 reference statements)

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“…However, this approach typically generates a low color rendering index because of the lack of red light in the emission spectrum of the yellow phosphor. The solution is to add red phosphors that can be efficiently excited by blue light [ 6 , 7 ] or use the high-efficiency UV LED and the phosphors that can be excited by it [ 8 , 9 ]. As a result, it is critical to investigate red phosphors that can be successfully stimulated by blue light and UV light.…”

Section: Introductionmentioning

confidence: 99%

Luminescent Properties and Charge Compensator Effects of SrMo0.5W0.5O4:Eu3+ for White Light LEDs

et al. 2023

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The high-temperature solid-phase approach was used to synthesize Eu3+-doped SrMo0.5W0.5O4 phosphors, whose morphological structure and luminescence properties were then characterized by XRD, SEM, FT-IR, excitation spectra, emission spectra, and fluorescence decay curves. The results reveal that the best phosphor synthesis temperature was 900 °C and that the doping of Eu3+ and charge compensators (K+, Li+, Na+, NH4+) had no effect on the crystal phase change. SrMo0.5W0.5O4:Eu3+ has major excitation peaks at 273 nm, 397 nm, and 464 nm, and a main emission peak at 615 nm, making it a potential red fluorescent material to be used as a down converter in UV LEDs (273 nm and 397 nm) and blue light LEDs (464 nm) to achieve Red emission. The emission spectra of Sr1−yMo0.5W0.5O4:yEu3+(y = 0.005, 0.01, 0.02, 0.05, 0.07) excited at 273 were depicted, with the Eu3+ concentration increasing the luminescence intensity first increases and then decreases, the emission peak intensity of SrMo0.5W0.5O4:Eu3+ achieves its maximum when the doping concentration of Eu3+ is 1%, and the critical transfer distance is calculated as 25.57 Å. When various charge compensators such as K+, Li+, Na+, and NH4+ are added to SrMo0.5W0.5O4:Eu3+, the NH4+ shows the best effect with the optimal doping concentration of 3wt%. The SrMo0.5W0.5O4:Eu3+,NH4+ color coordinate is (0.656,0.343), which is close to that of the ideal red light (0.670,0.333).

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Section: Introductionmentioning

confidence: 99%

Luminescent Properties and Charge Compensator Effects of SrMo0.5W0.5O4:Eu3+ for White Light LEDs

et al. 2023

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“…Scintillators convert ionizing radiation into visible-UV photons, and they have been widely utilized to measure ionizing radiation in the fields of security, (1) medical imaging, (2,3) and resource exploration. (4,5) In general, required properties of scintillators include high scintillation output, short decay time, high energy resolution, and high effective atomic number; however, since no materials currently satisfy the requirements of all applications, R&D has been performed continuously on scintillators in various forms such as single crystals, (6)(7)(8)(9)(10)(11) ceramics, (12)(13)(14) films, (15,16) glasses, (17)(18)(19)(20)(21)(22)(23) and liquids. (24)(25)(26) Our research has focused on rare-earth-activated alkali-earth aluminates, which have been intensely studied in phosphor fields (27)(28)(29) ; in particular, Eu,Dy-co-doped SrAl 2 O 4 is a wellknown long-lifetime phosphorescent material.…”

Section: Introductionmentioning

confidence: 99%

Radiation-induced Luminescence Properties of Ce-doped SrAl2O4 Crystal and Translucent Ceramic

Nakauchi¹,

Nakamura²,

Kato³

et al. 2023

Sensors and Materials

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A comparative study on the radioluminescence properties of Ce-doped SrAl 2 O 4 single crystal and translucent ceramic was performed. The transmittance of the synthesized ceramic is 20-30% in the visible region. Both samples exhibit photo-and radioluminescence with a broad emission peaking at 380 nm. The decay curves are fitted by a single exponential decay function with decay time constants of 30-50 ns, consistent with the typical value of the emission for the 5d-4f transitions of Ce 3+ . From the pulse height spectra measured under 241 Am γ-ray (59.5 keV) irradiation, the scintillation light yields are 17000 ph/MeV for the single crystal and 6100 ph/ MeV for the synthesized ceramic. The scintillation light yield and afterglow of the present samples show a negative correlation.

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“…Luminescent materials for radiation detection are roughly classified into two types: scintillators (1)(2)(3) and storage phosphors for dosimeters. (4 -7) Since the interaction probability of radiation species and elements varies widely, many kinds of materials including single crystals, (8 -31) glasses, (32)(33)(34)(35)(36)(37)(38)(39)(40)(41)(42)(43)(44)(45)(46)(47)(48)(49)(50) ceramics, (51)(52)(53)(54)(55)(56) and other materials (57)(58)(59)(60) have been researched. Requirements for properties vary considerably among applications, although high interaction probability, high luminescence intensity, and chemical stability are generally required.…”

Section: Introductionmentioning

confidence: 99%

Gamma-ray Energy Dependence of Scintillation Decay Time

Yanagida¹,

Watanabe²,

Kato³

et al. 2023

Sensors and Materials

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We investigated scintillation decay times at different excitation γ-ray energies for commercial luminescent materials such as Ce:LaBr 3 , Eu:SrI 2 , Ce:LYSO [(Y,Lu) 2 SiO 5 ], and Ce:GAGG [Gd 3 (Al,Ga) 5 O 12 ]. Ce:LaBr 3 and Eu:SrI 2 did not show energy dependence, whereas Ce:LYSO and Ce:GAGG exhibited different decay curves at different excitation energies. In these materials, the energy dependence of decay correlated with the nonproportionality of scintillation light yield.

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Photo- and Radioluminescence Properties of Eu3+-doped Y2O3 Thick Film Phosphor Prepared via Chemical Vapor Deposition

Cited by 10 publications

References 31 publications

Luminescent Properties and Charge Compensator Effects of SrMo0.5W0.5O4:Eu3+ for White Light LEDs

Luminescent Properties and Charge Compensator Effects of SrMo0.5W0.5O4:Eu3+ for White Light LEDs

Radiation-induced Luminescence Properties of Ce-doped SrAl2O4 Crystal and Translucent Ceramic

Gamma-ray Energy Dependence of Scintillation Decay Time

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