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采用微波法制备了Eu~(2+)掺杂的Ba_3Si_6O_(12)N_2绿色氮氧化物荧光粉,着重研究了不同助熔剂:BaCl_2、H_3BO_3、KF和NH_4F对Ba_3Si_6O_(12)N_2:Eu~(2+)发光性能的影响。利用X射线衍射(XRD)、荧光光谱仪、扫描电子显微镜(SEM)和量子效率(QE)等检测方法研究了不同助溶剂的作用机理。研究结果表明:添加助溶剂能够显著提高荧光粉的发光强度,添加不同助溶剂制备荧光粉的发光强度大小依次为H_3BO_3>KF>BaCl_2>无助溶剂>NH_4F。当添加1.0wt%的H_3BO_3时,所制备的荧光粉粒径分布比较均匀,形貌较好,荧光粉的发光强度最大,且与不添加助溶剂制备的荧光粉相比,有较高的量子效率和吸收效率,不同温度下的发射光谱表明其热淬灭性低,荧光寿命较短。
Eu ~ (2+) doped Ba_3Si_6O_ (12) N_2 green oxynitride phosphor was prepared by microwave method. The effects of different fluxes such as BaCl_2, H_3BO_3, KF and NH_4F on the photocatalytic activity of Ba_3Si_6O_ (12) N_2: Eu ~ 2+) luminescence properties. The mechanism of different cosolvents was investigated by X-ray diffraction (XRD), fluorescence spectroscopy, scanning electron microscopy (SEM) and quantum efficiency (QE). The results show that the addition of co-solvent can significantly improve the luminescence intensity of phosphors, and the luminescence intensity of phosphors prepared by adding different co-solvents followed by H_3BO_3> KF> BaCl_2> no-help solvent> NH_4F. When 1.0wt% H_3BO_3 was added, the size distribution of the prepared phosphors was relatively uniform, the morphology was good, and the luminescent intensity of the phosphors was the highest. Compared with the phosphors prepared without the flux, higher quantum yield Efficiencies and absorption efficiencies, emission spectra at different temperatures indicate low thermal quenching and shorter fluorescence lifetime.