Zinc tungstate (ZnWO₄) is a self-activating phosphor and exhibits a broad band blue-green emission under ultraviolet excitation. When doped with Eu³⁺ ions, ZnWO₄ may emit white light due to the fact that WO₄ ²⁻ could effectively transfer energy to Eu³⁺ ion. In this work, ZnWO₄:Eu³⁺ phosphors were fabricated by the liquid precipitation method, and then X-ray diffraction, transmission electron microscopy, field emission scanning electron microscopy, and photoluminescence spectra were used to investigate the morphology, structure, and luminescent properties. The emission colour of synthesised ZnWO₄:Eu³⁺ phosphors can be tuned from pink to white with increasing the annealing temperature, which may be attributed to the change of the crystallinity and the crystal defects in ZnWO₄:Eu³⁺phosphors. What is more, ZnWO₄:Eu³⁺phosphors emit an idea white light with the Commission International de L'Eclairage coordinates (0.32, 0.32) after annealing at 900°C.

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Effect of annealing temperature on luminescence properties of ZnWO₄:Eu³⁺ nanophosphor

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Effect of annealing temperature on luminescence properties of ZnWO4:Eu3+ nanophosphor

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Effect of annealing temperature on luminescence properties of ZnWO₄:Eu³⁺ nanophosphor