On luminescence stimulated from deep traps using thermally-assisted time-resolved optical stimulation in alpha-AL(2)O(3):C

Nyirenda A. N., Chithambo M. L., Polymeris G. S.

RADIATION MEASUREMENTS, cilt.90, ss.109-112, 2016 (SCI-Expanded, Scopus) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 90
  • Basım Tarihi: 2016
  • Doi Numarası: 10.1016/j.radmeas.2016.01.016
  • Dergi Adı: RADIATION MEASUREMENTS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.109-112
  • Anahtar Kelimeler: Deep traps, Time-resolved luminescence, Photo-transfer, Thermal assistance, Thermoluminescence, Lifetimes, OSL SIGNALS, QUARTZ, FEATURES, THERMOLUMINESCENCE, SYSTEM
  • Ankara Üniversitesi Adresli: Evet

Özet

We report a study of charge transfer mechanisms of electrons stimulated optically from very deep traps, also known as donor traps, in alpha-Al2O3:C. The investigations were carried out using thermally-assisted time-resolved optical stimulation, thermoluminescence and by way of residual thermoluminescence from the main electron trap. When the charges are optically stimulated from the deep traps, they are redistributed via the conduction band to the main electron trap and the shallow trap from where they are optically or thermally released for recombination at luminescence centres. The luminescence is strongly quenched at high measurement temperature as evident by very short luminescence lifetimes at these temperatures. The main peak due to residual thermoluminescence is located at a higher temperature than the conventional main peak. (C) 2016 Elsevier Ltd. All rights reserved.