Abstract
New red‐ and green‐emitting phosphors, AY1−xP2O7.5:xRE3+ (A=Ca and Sr; x=0.01, 0.03, 0.05, 0.10; RE=Eu and Tb) were synthesized by the conventional ceramic route and their photoluminescence properties under near‐ultraviolet (UV) irradiation were investigated. It was found that CaYP2O7.5: Eu3+ phosphor emits strong red light when excited by a radiation of 394‐nm wavelength and SrYP2O7.5:Eu3+ gives intense orange light when excited by a radiation of 396‐nm wavelength. Strong green emission for AY1−xP2O7.5:Tb3+ is also observed under near‐UV irradiation (378 nm). When compared with emission intensity from a standard YPO4:0.05Tb3+, the emission from SrYP2O7.5:0.05Tb3+ showed greater intensity values under the same excitation wavelength (378 nm). X‐ray powder diffraction analysis showed that AYP2O7.5 has xenotime‐type structure.
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