Photoluminescence, afterglow and thermoluminescence in SrAl2O4: Eu2 +, Dy3 + irradiated with blue and UV light

V. Chernov*, T. M. Piters, R. Meléndrez, W. M. Yen, E. Cruz-Zaragoza, M. Barboza-Flores

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


The luminescence in SrAl2 O4 : Eu2 +, Dy3 + under continuous excitation is quite different from the "standard" intra-ion photoluminescence (PL) and gradually grows during hundreds of seconds before reaching the saturation (photo-charging effect). In this work, we report the behavior of photo-charging effect under the blue and UV light irradiation at temperatures between 20 and 370 K, as well as afterglow (AG) and thermoluminescence (TL) observed after the irradiation termination. At 20 K the photo-charging effect is absent. With increasing temperature the photo-charging effect appears as a result of PL decreasing due to competitive trapping process with activation energy of 0.17 eV. The AG decay curves are described well by the Becquerel's law with the exponent close to 1. The AG decay time is about 10-50 s and practically does not depend on temperature. The TL glow curve exhibits at least seven partially overlapped peaks with maxima at 50, 65, 80, 155, 200, 250 and 290 K. The emission spectra of Eu2 + consist of two bands at 450 and 520 nm. Both the bands are the same for the PL, AG and TL spectra, but their ratio depends on temperature and the luminescence type.

Original languageEnglish
Pages (from-to)668-671
Number of pages4
JournalRadiation Measurements
Issue number4-5
StatePublished - Apr 2007

Bibliographical note

Funding Information:
The Universidad de Sonora (México) kindly acknowledges the transfer of the long persistent phosphors from University of Georgia. These phosphor materials are covered by US Patents 6,117,362 and 6,267,911 as well as other Pending Patent Applications assigned to the University of Georgia Research Foundation, Inc. We acknowledge financial support from SEP and Conacyt Grants Nos. 36521, 37641 and 32069.


  • AG
  • OSL
  • PTTL
  • Persistence luminescence
  • SrAl O : Eu, Dy
  • TL


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