Photoluminescence and Scintillation Properties of Tb:GdTaO4 Crystals

Self Cite

A (C 6 H 5 C 2 H 4 NH 3 ) 2 PbI 4 crystal was prepared to investigate its photoluminescence (PL) and scintillation properties. Two PL emission peaks at 525 and 560 nm derived from the recombination of excitons were observed. The obtained PL decay curve was approximated from the sum of three exponential decay functions related to the excitonic luminescence. Under X-ray irradiation, the excitonic emission at 560 nm from shallow trap centers was observed, and the X-ray induced scintillation decay times were 0.8, 6.0, and 37 ns. The full energy peak was observed under 241 Am α-ray (5.5 MeV) irradiation, and the light yield was estimated to be ~2900 ph/5.5 MeV-α.

Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Scintillation Properties of an Organic–Inorganic Lead Iodide Perovskite Single Crystal Having Quantum Well Structures

Okazaki¹,

Onoda²,

Nakauchi³

et al. 2022

Self Cite

“…In this study, we focused on a translucent ceramic, (22)(23)(24) a new material form of scintillators that can be used to enhance lattice-defect luminescence. Translucent ceramics have more lattice defects than other material forms such as single crystals, (25,26) which are generally used as scintillators; thus, ZnO translucent ceramics may have enhanced LY. Moreover, it was previously reported that the introduction of Li increased the concentration of lattice defects and enhanced the photoluminescence (PL) properties of ZnO films.…”

Section: Introductionmentioning

confidence: 99%

Scintillation Properties of Li-doped ZnO Translucent Ceramic

Kunikata¹,

Kato²,

Shiratori³

et al. 2022

Self Cite

We synthesized a 0.1% Li-doped ZnO translucent ceramic using spark plasma sintering (SPS) and annealed it at 700 or 800 °C in air. The photoluminescence (PL) and scintillation properties of all samples were evaluated. The PL quantum yield (QY) and scintillation light yield (LY) were improved by annealing owing to the reduction in the number of oxygen defects in comparison with the as-prepared sample. Among the translucent ceramic samples, the sample annealed at 700 °C showed the highest LY (5800 ph/5.5 MeV-α); the scintillation LY was lower in the sample annealed at 800 °C because of the increase in the number of trap sites.

“…(3) In general, an X-or γ-ray scintillator requires a high scintillation light yield (LY), short decay time, high energy resolution, high density, large effective atomic number, and low afterglow. Therefore, there has been continuous R&D to develop more desirable materials in single crystal, (4)(5)(6)(7)(8)(9)(10)(11)(12) ceramic, (13)(14)(15) glass, (16)(17)(18)(19) and liquid forms. (20)(21)(22) A high density and a large effective atomic number are important for obtaining large cross sections against X-and γ-rays; (23) thus, pyrochlore rare-earth hafnates (RE 2 Hf 2 O 7 , RE: rare earth) are potential scintillators with high density (9.0 and 9.7 g/cm 3 for Gd 2 Hf 2 O 7 and Lu 2 Hf 2 O 7 , respectively (24) ) and large effective atomic numbers (66-69).…”

Section: Introductionmentioning

confidence: 99%

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

Nakauchi¹,

Fukushima²,

Kato³

et al. 2022

Self Cite

Gd 2 Hf 2 O 7 and Lu 2 Hf 2 O 7 single crystals doped with various rare-earth ions (Ce 3+ , Pr 3+ , and Tb 3+ ) were prepared by the floating zone method to investigate their photoluminescence and scintillation properties. The Ce-doped samples show scintillation signals with a broad peak in the range of 400-600 nm, whereas the Tb-and Pr-doped samples show relatively strong emission characterized by a few sharp peaks in the range of 480-700 nm due to 4f-4f transitions of the dopant ions. The scintillation spectra of the Ce-doped Lu 2 Hf 2 O 7 after annealing at various temperatures show significant changes in their shapes, suggesting changes in the valence of the Ce ions.