Open AccessEffects of Li+ Codoping on the Optical Properties of SrAl2O4 Long Afterglow Ceramic Phosphors
Author(s) -
Timur Sh. Atabaev,
Hong Ha Thi Vu,
Mac Kim,
Yong Suk Yang,
Hyung-Kook Kim,
YoonHwae Hwang
Publication year - 2014
Publication title -
advances in optics
Language(s) - English
Resource type - Journals
eISSN - 2356-6817
pISSN - 2314-7741
DOI - 10.1155/2014/459065
Subject(s) - phosphor , afterglow , materials science , photoluminescence , luminescence , phosphorescence , persistent luminescence , analytical chemistry (journal) , scanning electron microscope , aluminate , mineralogy , nuclear chemistry , thermoluminescence , fluorescence , optics , optoelectronics , chemistry , physics , gamma ray burst , chromatography , astronomy , cement , metallurgy , composite material
Rare-earths codoped long afterglow strontium aluminate phosphors with high brightness were synthesized via a facile combustion synthesis method using urea as a fuel. The resulted phosphor particles were analyzed by using X-ray diffraction and field emission scanning electron microscope, whereas their optical properties were monitored by photoluminescence spectroscopy. The prepared SrAl2O4:Eu2+, Dy3+, Li+ samples showed a broad green-yellowish emission, peaking at 512 nm when excited by 348 nm. Compared to traditional SrAl2O4:Eu2+, Dy3+ phosphor, the initial luminescence brightness of SrAl2O4:Eu2+, Dy3+, codoped with Li+ improved from 1.89 cd/m2 to 2.71 cd/m2 and the afterglow decay time was prolonged from 103 to 121 min. The possible mechanism of SrAl2O4:Eu2+, Dy3+, Li+ phosphorescence enhancement has been discussed
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