Synthesis and Luminescence Properties of Y2MgTiO6∶Eu3+Red-Emitting Phosphor
A series of novel red-emitting phosphors of Y2-2xMgTiO6∶2xEu3+(YMT∶2xEu3+,0≤x≤0.11)were synthesized by sol-gel method.Phase purity was examined by X-ray diffractometer(XRD)and the results show that the obtained YMT∶Eu3+phosphors crystallize in the monoclinic space group P21/n and no other peaks are observed.The SEM images show that the obtained particles exhibit the non-uniform shapes with an average size of 2 µm.The photoluminescence spectrum under the excitation of 264 nm reveals four narrow bands at 591,619,657 and 698 nm,which correspond to the 5D0→7F1,5D0→7F2,5D0→7F3 and 5D0→7F4 transitions of Eu3+,respectively.The energy transfer mechanism among Eu3+ions is identified as dipole-dipole(d-d)interactions.The phosphor of YMT∶O.14Eu3+exhibits a chromaticity coordinates of(0.645,0.332),which is close to the standard red color coordinates(0.67,0.33).The temperature-dependent PL spectra were analyzed,and the calculated activation energy indicates the acceptable thermal stability of the phosphor.Hence,the red-emitting phosphors of YMT:Eu3+can be potentially applied to LED.
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