黄光发射纯Zn_(3)V_(2)O_(8)荧光粉的制备及光学性能研究

Preparation of Yellow-Emitting Pure Zn_(3)V_(2)O_(8) Phosphors and Its Optical Properties

以1%BaF_(2)为助溶剂通过简单的高温固相法成功合成了黄光发射纯Zn_(3)V_(2)O_(8)荧光粉。采用X射线衍射(XRD)测定了Zn_(3)V_(2)O_(8)的纯度,通过激发/发射(PLE/PL)光谱、热猝灭光谱和荧光寿命曲线分析了其光学性质。结果表明:在360 nm激发下,Zn_(3)V_(2)O_(8)荧光粉在400~800 nm表现出较强的宽带发射,该发射归因于^(3)T_(2)→^(1)A_(1)和^(3)T_(1)→^(1)A_(1)的电子跃迁,其最佳发射波长在550 nm,发出明亮的黄光。在550 nm的监测下,Zn_(3)V_(2)O_(8)荧光粉在200~450 nm呈现宽吸收带。Zn_(3)V_(2)O_(8)荧光粉的发射衰减时间为1.67 ms,室温内量子效率高达47.09%。当温度升高到140℃时,该荧光粉的高温发射强度相比于室温发射强度的保持率为25.1%,高于其他石榴石结构的钒酸盐材料。Zn_(3)V_(2)O_(8)荧光粉作为新型白光发光二极管器件的黄光光源在低成本、可大批量生产方面具有潜在的优势。

Yellow-emitting pure Zn_(3)V_(2)O_(8) phosphors were successfully synthesized via a simple high-temperature solid-state method using BaF_(2) as heat-assisted co-solvent.The purity of Zn_(3)V_(2)O_(8) was determined by X-ray diffraction(XRD),and its optical properties were analyzed by PLE/PL spectrum,thermal quenching spectrum and fluorescence lifetime curve analysis.The results show that Zn_(3)V_(2)O_(8) exhibits strong broadband emission in the range of 400~800 nm under the excitation of 360 nm,which is attributed to ^(3)T_2→^(1)A_(1) and ^(3)T_(1)→^(1)A_(1)transition.Zn_(3)V_(2)O_(8) can emit bright yellow light and the optimum emission wavelength is 550 nm.Under 550 nm,Zn_(3)V_(2)O_(8) phosphors show wide absorption bands in the range of 200~450 nm.The decay time of Zn_(3)V_(2)O_(8phosphor) is 1.67 ms and its inner quantum efficiency reaches 47.09% at room temperature.Moreover,when the temperature rose to 140 ℃,its emission intensity retention could reach 25.1% of its initial intensity at room temperature,which is higher than that of other garnet structure vanadate materials.Therefore,Zn_(3)V_(2)O_(8) phosphor as a novel yellow light source for white light-emitting diode devices has potential advantages in terms of low cost and the ability to be mass-produced.