The effect of calcium substitution on the afterglow of Eu2+/Dy3+ doped Sr4Al14O25

The effect of calcium substitution on the afterglow of tetrastrontium aluminate phosphors (Sr 4 Al 14 O 25 :Eu 2+ , Dy 3+ ) was investigated. A series of (Sr 1 - x Ca x )O⊎nAl 2 O 3 :Eu 2+ (1%), Dy 3+ (0.5%), with variation of calcium content (x = 0 − 1), were synthesized by a high temperature solid...

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Veröffentlicht in:	Central European journal of chemistry 2009-06, Vol.7 (2), p.164-167
Hauptverfasser:	Dacyl, Danuta, Uhlich, Dominik, Jüstel, Thomas
Format:	Artikel
Sprache:	eng
Schlagworte:	Afterglow Biochemistry Biological and Medical Physics Biophysics Chemistry Chemistry and Materials Science Chemistry/Food Science Dysprosium Europium Geochemistry Phase transition Photoluminescence spectra Tetra strontium aluminate
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Zusammenfassung:	The effect of calcium substitution on the afterglow of tetrastrontium aluminate phosphors (Sr 4 Al 14 O 25 :Eu 2+ , Dy 3+ ) was investigated. A series of (Sr 1 - x Ca x )O⊎nAl 2 O 3 :Eu 2+ (1%), Dy 3+ (0.5%), with variation of calcium content (x = 0 − 1), were synthesized by a high temperature solid state reaction in a reducing atmosphere. The photoluminescence, persistent luminescence (afterglow), and lumen equivalents of these materials were studied and compared. It turned out that the afterglow properties of the phosphors were strongly dependent on the Sr/Ca ratio. As the Ca content increased, a phase transition and blue shift in emission spectra were observed.
ISSN:	1895-1066 2391-5420 1644-3624 2391-5420
DOI:	10.2478/s11532-009-0017-z