New Red- and Green-Emitting Phosphors, AYP2O7.5:RE3+ (A=Ca and Sr; RE=Eu and Tb) under Near-UV Irradiation |
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| Authors: | Suman Mariam Thomas P Prabhakar Rao K Ravindran Nair Peter Koshy |
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| Affiliation: | Materials and Minerals Division, National Institute for Interdisciplinary Science and Technology (NIST), Trivandrum, India |
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| Abstract: | New red- and green-emitting phosphors, AY1− x P2O7.5: x RE3+ (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− x P2O7.5: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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