Dose dependent x-ray luminescence in MgF2

Eu2+, Mn2+ phosphors

Wei Chen, Sarah L. Westcott, Shaopeng Wang, Yuanfang Liu

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

In Mg F2: Mn2+, Eu2+ phosphors, the x-ray excited luminescence from Eu2+ is decreased while the emission from Mn2+ is increased in intensity with the increase of x-ray dose. In Mg F2: Mn2+, the luminescence is also increased, and in MgF2: Eu2+, the emission of Eu2+ is also decreased in intensity with the increase of x-ray dose. However, the intensity changes with x-ray dose in the singly doped Mg F2: Mn2+ and MgF2: Eu2+ phosphors are much less than those in the doubly doped Mg F2: Mn2+, Eu2+ phosphors. The increase of Mn2+ emission in intensity is likely due to the breakdown of the forbidden transition by the defects created by x-ray irradiation. No conversion of Eu2+ ions to Eu3+ ions was observed in MgF2: Eu 2+ phosphors during x-ray irradiation. The decrease of Eu2+ emission in intensity in Mg F2: Mn2+, Eu2+ must be closely related to the interaction and the energy transfer to Mn2+ ions. The phenomenon observed is potentially interesting for the practical applications for radiation detection, as utilizing the ratio of the two emissions from Mn2+ and Eu2+ for radiation detection is more sensitive and more reliable than using emission intensity change only.

Original languageEnglish (US)
Article number113103
JournalJournal of Applied Physics
Volume103
Issue number11
DOIs
StatePublished - 2008
Externally publishedYes

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phosphors
luminescence
dosage
x ray irradiation
x rays
ions
forbidden transitions
radiation
breakdown
energy transfer
defects
interactions

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

Cite this

Dose dependent x-ray luminescence in MgF2 : Eu2+, Mn2+ phosphors. / Chen, Wei; Westcott, Sarah L.; Wang, Shaopeng; Liu, Yuanfang.

In: Journal of Applied Physics, Vol. 103, No. 11, 113103, 2008.

Research output: Contribution to journalArticle

Chen, Wei ; Westcott, Sarah L. ; Wang, Shaopeng ; Liu, Yuanfang. / Dose dependent x-ray luminescence in MgF2 : Eu2+, Mn2+ phosphors. In: Journal of Applied Physics. 2008 ; Vol. 103, No. 11.
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abstract = "In Mg F2: Mn2+, Eu2+ phosphors, the x-ray excited luminescence from Eu2+ is decreased while the emission from Mn2+ is increased in intensity with the increase of x-ray dose. In Mg F2: Mn2+, the luminescence is also increased, and in MgF2: Eu2+, the emission of Eu2+ is also decreased in intensity with the increase of x-ray dose. However, the intensity changes with x-ray dose in the singly doped Mg F2: Mn2+ and MgF2: Eu2+ phosphors are much less than those in the doubly doped Mg F2: Mn2+, Eu2+ phosphors. The increase of Mn2+ emission in intensity is likely due to the breakdown of the forbidden transition by the defects created by x-ray irradiation. No conversion of Eu2+ ions to Eu3+ ions was observed in MgF2: Eu 2+ phosphors during x-ray irradiation. The decrease of Eu2+ emission in intensity in Mg F2: Mn2+, Eu2+ must be closely related to the interaction and the energy transfer to Mn2+ ions. The phenomenon observed is potentially interesting for the practical applications for radiation detection, as utilizing the ratio of the two emissions from Mn2+ and Eu2+ for radiation detection is more sensitive and more reliable than using emission intensity change only.",
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