Articles
  • Photo- and radio- luminescence characterizations in rare-earth-doped SrAl2O4 crystals

  • Daisuke Nakauchia,*, Masanori Koshimizub, Noriaki Kawaguchia and Takayuki Yanagidaa

  • aDivision of Materials Science, Nara Institute of Science and Technology (NAIST), 8916-5 Takayama, Ikoma, Nara 630-0192, Japan
    bDepartment of Applied Chemistry, Graduate School of Engineering, Tohoku University, 6-6-07 Aoba, Aramaki, Aoba, Sendai, Ibaraki 980-8579, Japan

Abstract

SrAl2O4 bulk crystals doped with all rare-earth (RE) ions except for Sc, Y, La, Pm and Lu were synthesized by the optical floating zone method to systematically investigate the photoluminescence (PL) and radioluminescence (RL) properties for radiation detector applications. The crystal samples show PL and RL signals due to the 5d-4f or 4f-4f transitions of doped RE ions, and each decay curve consists of a sum of exponential functions with the typical decay time constants. Under VUV photon excitation, the Ce-, Pr-, Eu-, Tb-, Dy- and Ho-doped samples exhibit PL predominantly with two broad emission bands around 320 and 600 nm, which are possibly due to self-trapped excitons (STEs) perturbed by RE ions.


Keywords: Scintillator, Dosimetry, Radioluminescence, Photoluminescence, VUV, Crystal growth

This Article

  • 2019; 20(4): 307-313

    Published on Aug 31, 2019

  • Received on Nov 16, 2018
  • Revised on Jan 16, 2019
  • Accepted on May 9, 2019

Correspondence to

  • Daisuke Nakauchi

  • Division of Materials Science, Nara Institute of Science and Technology (NAIST), 8916-5 Takayama, Ikoma, Nara 630-0192, Japan
    Tel : +81-743-72-6144

  • E-mail: nakauchi.daisuke.mv7@ms.naist.jp