Phosphorescent dynamics in SrAl 2O 4: Eu 2 +, Dy 3 + single crystal fibers

We report for the first time the growth of activated alkaline earth aluminate single crystals with long persistent phosphorescence. Measurements of the phosphorescence and decay dynamics on samples of SrAl 2O 4 crystals doped with Eu 2 + only and with Eu 2 + and Dy 3 + indicate that the trapping rat...

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Bibliographic Details
Published inJournal of luminescence Vol. 76; pp. 424 - 428
Main Authors Jia, Weiyi, Yuan, Huabiao, Lu, Lizhu, Liu, Huimin, Yen, W.M.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 1998
Subjects
Dy 3
Er 2
Eu 2
Phosphorescence
SrAl 2O 4
Eu 2
SrAl 2O 4
Dy 3
Phosphorescence
Er 2
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Summary:We report for the first time the growth of activated alkaline earth aluminate single crystals with long persistent phosphorescence. Measurements of the phosphorescence and decay dynamics on samples of SrAl 2O 4 crystals doped with Eu 2 + only and with Eu 2 + and Dy 3 + indicate that the trapping rate of Dy ions is very fast; the efficiency of trapping is estimated to be about 40% at room temperature. The decay curve of the after-glow is nonexponential, and cannot be explained simply by thermally activated detrapping processes. Hole transport may be an important factor in persistent phosphorescence.
ISSN:0022-2313
1872-7883
DOI:10.1016/S0022-2313(97)00230-5