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Eu3+ doped Ln3TaO7 (Ln=La, Gd, Y, Lu) red phosphors were prepared using a solid state route. The Ln3+ substitution induces variation of crystalline structure from a defect fluorite to weberite types with increased ordering of the cations from Lu to La. These phosphors show strong absorptions at near UV wavelength and emit orange–red luminescence. The increased trend in luminescence lifetime further...
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