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A series of Dy3+-, Tm3+-, Eu3+ co-activated Ba2CaLa(PO4)3 phosphors were synthesized via a standard solid state reaction under normal ambient air, and the emission colors could be tuned from blue to white and then to red. It was discovered that the energy is transferred from Tm3+ to Dy3+ by directly observing overlap of the excitation spectrum of Dy3+ and the emission spectrum of Tm3+ and Dy3+. By...
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