Photoluminescence and Scintillation Properties of Ce-, Pr-, and Tb-doped (Gd,Lu)2Hf2O7 Crystals

In this study, Mg 1.995−x SiO 4 :xCe, 0.005Tb (x = 0 and 0.01) single crystals were synthesized by the floating zone method and their photoluminescence (PL) and dosimetric properties were evaluated. In the PL process, emission peaks due to the 4f-4f transitions of Tb 3+ ions were observed in the x = 0 and 0.01 samples, and the emission peak due to the 5d-4f transitions of Ce 3+ ions was detected in the x = 0.01 sample. In the thermally stimulated luminescence (TSL) process, only emission peaks due to the 4f-4f transitions of Tb 3+ ions were observed in both samples, and the x = 0.01 sample had higher TSL intensity than the x = 0 sample. The x = 0.01 sample showed a lower detection limit of 0.01 mGy and a spatial resolution of 50.0 μm under X-ray irradiation.

Section: Resultsmentioning

confidence: 99%

Analysis of Photoluminescence and Dosimetric Properties of (Ce, Tb)-codoped Magnesium Orthosilicate Single Crystals

Ichiba¹,

Takebuchi²,

Kimura³

et al. 2023

“…(4) Because the physical and chemical properties of each scintillator are different, the most suitable one is selected on the basis of the requirements of the application. Various material forms have been used as scintillators, such as crystals, (5)(6)(7)(8)(9) ceramics, (10,11) glasses, (12)(13)(14) and liquids. (15)(16)(17)(18) To date, scintillators emitting UV-visible photons have been mainly studied because they have been used in combination with photodetectors having wavelength sensitivity in the UV-visible ranges (19) such as photomultiplier tubes (PMTs) and Si photodiodes (PDs).…”

Section: Introductionmentioning

confidence: 99%

Radiation-induced Luminescence Properties of Tm-doped Bi4Ge3O12 Single Crystals

Okazaki¹,

Nakauchi²,

Fukushima³

et al. 2023

We grew 0.1, 0.5, and 1% Tm-doped Bi 4 Ge 3 O 12 single crystals by the floating zone method. Their photoluminescence and scintillation properties were investigated in the range from visible to near-IR. Luminescence spectra and decay times consistent with the transitions of Tm 3+ were confirmed. X-ray-irradiated dose rate response properties were evaluated using the prepared samples and an InGaAs photodiode. The 1% Tm-doped sample showed the widest dynamic range (0.03-60 Gy/h) among the prepared samples.

“…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

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.