Data di Pubblicazione:
2010
Citazione:
Optical properties tailoring for new devices engineering in high-gap oxides / P.C. Ricci, A. Casu, M. Salis, E. Fortin, A. Anedda. - In: PHYSICA STATUS SOLIDI. A, APPLICATIONS AND MATERIALS SCIENCE. - ISSN 1862-6300. - 207:7(2010 Jul 12), pp. 1751-1755. [10.1002/pssa.200983752]
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.
Tipologia IRIS:
01 - Articolo su periodico
Keywords:
Bandgap; Optoelectronic applications; Oxides; Radio luminescence; Thermoluminescence
Elenco autori:
P.C. Ricci, A. Casu, M. Salis, E. Fortin, A. Anedda
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