Persistent luminescence of SrAl<inf>2</inf>O<inf>4</inf>: Eu<sup>2+</sup>, Dy<sup>3+</sup>, Cr<sup>3+</sup>phosphors in the tissue transparency window

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Journal Article
Materials Chemistry and Physics, 2014, 147 (3), pp. 772 - 776
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We report on the persistent luminescence of SrAl2O4: Eu2+, Cr3+phosphor centered at 760 nm. The phosphor was prepared by sol-gel-combustion method. Persistent luminescence from Cr3+lasted for hundreds of seconds, comparable to the long afterglow from Eu2+ions in the visible region based on the continuous energy transfer from Eu2+ions to Cr3+ions. The introduction of Dy3+ions into the phosphor further prolonged the afterglow time of Eu2+and Cr3+ions through the depth control of the charge traps. The optimum doping concentrations for Eu2+, Cr3+and Dy3+were 1%, 2% and 1.5%, respectively. © 2014 Published by Elsevier B.V.
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