Luminescent properties of Cr-doped gallium garnet crystals grown by the micro-pulling-down method

Shunsuke Kurosawa, Akira Suzuki, Akihiro Yamaji, Kei Kamada, Jan Pejchal, Yuji Ohashi, Yuui Yokota, Valery Ivanovich Chani, Akira Yoshikawa

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Cr-doped (GdxY1−x)3Ga5O12 crystals (x=0.00, 0.25, 0.50, 0.75 and 1.00) were grown by the micro-pulling-down method and examined for their possible application as red and infrared scintillating detectors in medical field. Although Cr:(Gd0.75Y0.25)3Ga5O12 and Cr:Gd3Ga5O12 had similar X-ray diffraction patterns, other samples showed some change in lattice constant. All the crystals had broad emission bands in the red and infrared region when excited by either 450 nm photons or X rays. These bands were associated with 4T2→A2 transitions. Moreover, redshift of the emission-peak wavelengths (4T24A2) and absorption peaks (4A24T1 and 4T2) was observed with increase of Gd content (x) in Cr-doped (GdxY1−x)3Ga5O12 due to the change of the crystal fields. The crystals had scintillation emissions in the wavelength region suitable for the real time dose monitoring in radiation therapy.

Original languageEnglish
Pages (from-to)95-100
Number of pages6
JournalJournal of Crystal Growth
Volume452
DOIs
Publication statusPublished - 2016 Oct 15

Keywords

  • A2: Single crystal growth
  • B1: Gallium compounds
  • B2: Scintillator materials
  • B3: Scintillators

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

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