Persistent near infrared phosphorescence from rare earth ions Co-doped strontium aluminate phosphors

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Journal Article
Journal of the Electrochemical Society, 2011, 158 (2)
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Sr Al2 O4 phosphors co-doped with Eu2+, Dy3+, and Nd3+ ions are synthesized through a citric acid assisted sol-gel combustion process. The crystalline phases and crystallinity of the synthesized phosphors are studied by X-ray diffraction analysis. Strong persistent phosphorescence at 882 nm is observed as a consequence of irradiation by ultraviolet light at 370 nm due to the persistent energy transfer from excited Eu2+ ions to Nd3+ ions. The optimum doping concentration of Nd3+ ions is estimated to be ∼2%, when the concentration of Eu2+ and Dy3+ ions are 1 and 1.5%, respectively, considering the energy transfer efficiency and the near infrared phosphorescence intensity. © 2010 The Electrochemical Society.
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