Systematic comparison of saturation effects and afterglow properties of Sr4Al14O25: Eu, Dy phosphor excited by alpha and beta ionizing sources and UV light

Viktor Havasi, Dávid Tátrai, Gábor Szabó, György Sipos, Z. Kónya, Á. Kukovecz

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

This study reports on the radioactive- and photo-charging effects related afterglow properties of the long-afterglow Sr4Al14O25:Eu, Dy phosphor (SAED). Saturation and oversaturation behavior, trapping and de-trapping sequences, decay profiles and resistivity of SAED to alpha, beta and UV excitations are detailed. Thermoluminescence and afterglow measurements were performed on SAED subjected to different irradiation dose/time. In order to determine the saturation point of SAED, phosphors were charged by 0.5–800 Gy dose using radioactive alpha and beta sources and for 0.02–900 min by near UV light. By radioactive excitations only a saturation tendency was observed, whereas clear indication of oversaturation was found for photo-charging. Different saturation tendencies were also observed as a function of average SAED particle size due to the different penetration depth and efficiency of the excitation radiations. A uniform de-trapping sequence, but an opposite trapping sequence was found for ionizing radiation and for UV charging due to secondary excitation effects of high-energy irradiation. After the saturation point, a slight reduction of charge carrier concentration and PL intensity were observed. This was evidenced by the shifting dominant components of the modeled afterglow and TL curves. Repeated charging by ionizing radiation does not effected the afterglow properties of SAED adversely. On the other hand, thermal exposure up to 350 °C reduced photoluminescence intensity even in inert atmosphere.

Original languageEnglish
Pages (from-to)89-98
Number of pages10
JournalJournal of Molecular Structure
Volume1140
DOIs
Publication statusPublished - Jul 15 2017

Fingerprint

Ultraviolet radiation
Phosphors
Ionizing radiation
Irradiation
Thermoluminescence
Charge carriers
Dosimetry
Carrier concentration
Photoluminescence
Particle size
Radiation

Keywords

  • Ionizing radiation
  • Overcharge
  • Phosphorescence
  • Trapping sequence

ASJC Scopus subject areas

  • Analytical Chemistry
  • Spectroscopy
  • Organic Chemistry
  • Inorganic Chemistry

Cite this

Systematic comparison of saturation effects and afterglow properties of Sr4Al14O25 : Eu, Dy phosphor excited by alpha and beta ionizing sources and UV light. / Havasi, Viktor; Tátrai, Dávid; Szabó, Gábor; Sipos, György; Kónya, Z.; Kukovecz, Á.

In: Journal of Molecular Structure, Vol. 1140, 15.07.2017, p. 89-98.

Research output: Contribution to journalArticle

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