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Spectroscopic properties of K3Gd(PO4)2: Tm3+-Dy3+ under ultraviolet (UV) light and low-voltage electron beam excitations were investigated. Upon direct excitation Tm3+ from its 6F6 level to 1D2 level, the decrease of emission intensity and lifetime of Tm3+ 1D2-3F4 emission with increasing concentration of Dy3+ in K3Gd(PO4)2: Dy3+, Tm3+ confirmed the occurrence of energy transfer from Tm3+ to Dy3+...
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