Optical properties tailoring for new devices engineering in high-gap oxides

Pier Carlo Ricci, Alberto Casu, Marcello Salis, Emery Fortin, Alberto Anedda

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Monocrystal matrices of high-gap oxides are finding increasing applications as hosts of luminescent ions, typically rare earths (RE)s. Currently, RE-doped oxyorthosilicates, aluminum perovskites, and garnets (RE 2SiO 5-REAlO 3-RE 3Al 5O 12) are widely used as highly efficient and fast scintillators for g-ray detection. On the other hand, shallow or deep intragap energy levels, due to stoichiometric deviation or impurities unintentionally added in the crystals, play a counteractive role giving rise to slower scintillation decay time, reduced light yield and afterglow. The aim of this work is to show how it is possible to tailor these unwelcome outcomes and RE-ion interactions for engineering new devices for optical memory storage. In this sense, experimental results of thermo- and radio-luminescence are presented. The role of the bandgap and the location in energy of the levels due to the RE dopants and to the defects is discussed from a theoretical point of view. The feasibility in the near future of new promising transparent displays is also discussed.

Original languageEnglish (US)
Pages (from-to)1751-1755
Number of pages5
JournalPhysica Status Solidi (A) Applications and Materials Science
Volume207
Issue number7
DOIs
StatePublished - Jul 2010
Externally publishedYes

Keywords

  • Bandgap
  • Optoelectronic applications
  • Oxides
  • Radio luminescence
  • Thermoluminescence

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry
  • Electrical and Electronic Engineering

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