Kai Okazaki

ORCID: 0000-0003-2257-1915
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About
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Research Areas
  • Radiation Detection and Scintillator Technologies
  • Luminescence Properties of Advanced Materials
  • Atomic and Subatomic Physics Research
  • Perovskite Materials and Applications
  • Nuclear materials and radiation effects
  • Terahertz technology and applications
  • Digital Radiography and Breast Imaging
  • Medical Imaging Techniques and Applications
  • Solid-state spectroscopy and crystallography
  • Lanthanide and Transition Metal Complexes
  • Glass properties and applications
  • Nuclear Physics and Applications
  • Optical and Acousto-Optic Technologies
  • Solid State Laser Technologies
  • Crystal Structures and Properties
  • Inorganic Fluorides and Related Compounds
  • Polyoxometalates: Synthesis and Applications
  • Ga2O3 and related materials
  • Photochromic and Fluorescence Chemistry
  • Photopolymerization techniques and applications
  • Photoreceptor and optogenetics research
  • Transition Metal Oxide Nanomaterials
  • Advanced Chemical Sensor Technologies
  • Photochemistry and Electron Transfer Studies
  • Luminescence and Fluorescent Materials

Nara Institute of Science and Technology
2014-2025

Abstract Eu 2 O 3 -doped oxychloride tellurite glasses were fabricated, and their luminescent characteristics investigated for glass scintillators. Luminescent peaks originating from the transition between 4f energy levels of 3+ observed at 577, 592, 612, 652, 701 nm under 530 light. These also when irradiated with X-ray, maximum intensity was a concentration 3.0%. Furthermore, scintillation decay times about 0.64 ms detected glasses. Moreover, 3.0% exhibited lowest afterglow level (177 ppm)...

10.1007/s10854-024-14187-8 article EN cc-by Journal of Materials Science Materials in Electronics 2025-01-01

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

10.18494/sam3678 article EN cc-by Sensors and Materials 2022-02-17

Abstract Recently, glasses have gained great interest for use as scintillators owing to lots of industrial benefits such ease producing customizable shapes and low production cost. Herein, the Er 3+ -activated BaO–Nb 2 O 5 –TeO were fabricated development NIR glass scintillators. The exhibited efficient photoluminescence scintillation that originated from 4f→4f transition . Their quantum yields in 80% (0.1%Er 3 ), 81% (0.5%Er 61% (1.0%Er ). Further, an almost linear correlation between X-ray...

10.35848/1347-4065/ace013 article EN Japanese Journal of Applied Physics 2023-06-20
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