Single crystal growth and luminescent properties of Tb doped GdTaO4 by the μ-pulling down method

Rikito Murakami, Kei Kamada, Shuichi Hatakeyama, Katsunori Ueno, Yuichiro Ueno, Takahiro Tadokoro, Yasuhiro Shoji, Shunsuke Kurosawa, Akihiro Yamaji, Yuji Ohashi, Masao Yoshino, Yuui Yokota, Akira Yoshikawa

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

GdTaO4 and (Gd1-xTbx)TaO4 (x = 0, 0.001, 0.02, 0.04, 0.10, and 0.16) single crystals were grown by the micro-pulling down method. The crystallographic system of the grown crystals was identified to be monoclinic (I2/a), which is the stable low-temperature phase of GdTaO4. In the photoluminescence (PL) spectra, intense emission was observed at 549 nm (5D37F4 transition of Tb3+) for every Tb doped GdTaO4. In the excitation spectra for the 549 nm emission, several excitation paths to the Tb3+ were attributed: 4f-4f transitions of Gd3+, 4f8-4f75d transitions of Tb3+ and charge transfer of TaO4 3− group. Radiolumincece spectra under X-ray irradiation were taken, and the highest emission peak was observed at 544 nm, which was ascribed to the 5D47F5 transition of Tb3+. The Tb 2% doped GdTaO4 showed the highest emission intensity at the 544 nm, and as increasing dopant concentration, the intensity decreased due to the cross-relaxation of Tb3+.

Original languageEnglish
Pages (from-to)94-97
Number of pages4
JournalOptical Materials
Volume87
DOIs
Publication statusPublished - 2019 Jan

Keywords

  • Luminescence
  • Single crystal growth
  • Tantalate
  • X-ray diffraction

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Computer Science(all)
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Electrical and Electronic Engineering

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