Development of novel scintillation and photo-conversion materials based on Gd3(Sc,Al,Ga)5O12:Ce single crystals grown by micro-pulling-down method

A. Markovskyi, K. Bartosiewicz, W. Chewpraditkul, K. J. Kim, S. Witkiewicz-Lukaszek, T. Zorenko, A. Yoshikawa, Yu Zorenko

Research output: Contribution to journalArticlepeer-review

Abstract

Luminescence, scintillation and photoconversion properties of Gd3Al5−x−yScxGayO12:Ce crystals, grown by the micro-pulling-down method, were studied upon substitution of Al for Sc3+ and Ga3+ in the x = 1–2;y = 1–3 ranges. A decrease of the band gap and crystal field strength occurs in these garnets with increasing Sc3+ and Ga3+ content, resulted in blue-shift and reduced thermal stability of Ce3+ emission. Lowering of the scintillation light yield of crystals by two times and scintillation decay kinetic acceleration from 97 to 27 ns is observed at increasing Ga content in the y = 1–3 range. Sc and Ga admixing increases the number of deep charge traps, which additionally deteriorate of crystals scintillation performance. Application of Gd3Al5−x−yScxGayO12:Ce crystals as phosphor converters of white LED was considered. Increasing the Sc3+ and Ga3+ content in crystals leads to linear blue shift of the converter emission and results in increasing the color temperature of LEDs from neutral to could white light.

Original languageEnglish
Article number115395
JournalMaterials Science and Engineering B: Solid-State Materials for Advanced Technology
Volume273
DOIs
Publication statusPublished - 2021 Nov

Keywords

  • Ce
  • Crystal growth
  • Sc
  • Scintillators
  • Single crystals
  • white LEDs

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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