Abstract
We have synthesized yellow–orange CaO:Ce3+,Mn2+ phosphors by solid-state reaction. Photoluminescence properties and energy transfer mechanism from Ce3+ to Mn2+ ions have been investigated. The Ce3+ activated phosphors exhibit strong absorption in the range of 250–490nm and a yellow emission centered at 554nm. When Mn2+ ions were codoped, CaO:Ce3+,Mn2+ phosphors exhibit yellow emission band of Ce3+ as well as orange emission band centered at 600nm of Mn2+. We observed an efficient energy transfer from Ce3+ to Mn2+ ions in CaO:Ce3+,Mn2+, which was verified from the lifetime decay curves and was discussed by Dexter׳s energy transfer theory. The critical distance of the energy transfer from Ce3+ to Mn2+ ions has also been calculated to be 12.3Å by spectral overlap methods following Dexter׳s theory and by concentration quenching mechanism to be 15.2Å. Moreover, by combining the synthesized phosphors and InGaN blue chip (460nm), warm-white light has been created.
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