Abstract
(Ce3+, Mn2+)-codoped CaCO3 phosphors are synthesized by the coprecipitation method, and their optical properties are investigated using diffuse reflectance, photoluminescence (PL) analysis, PL excitation spectroscopy, and PL lifetime measurements. The effects of Ce3+ doping on the Mn2+ emission band are studied in detail. The temperature-dependent PL properties are analyzed on the basis of the configurational-coordinate model. These analyses allow a better understanding of the PL properties of Mn2+ within the CaCO3 host. Remarkably, the red emission intensity of Mn2+ in the (Ce3+, Mn2+)-codoped phosphor is enhanced more than 200 times compared to the single Mn2+-doped phosphor, thereby suggesting the occurrence of an efficient resonant energy transfer between Ce3+ and Mn2+ ions.
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