Y^(3+)、Gd^(3+)对La_(2)MgTiO_(6):Eu^(3+)红色荧光粉增强作用研究

Enhancement Effect of Y^(3+)and Gd^(3+)on La_(2)MgTiO_(6):Eu^(3+) Red Fluorescence

本文采用燃烧法,在成功合成稀土Eu^(3+)掺杂双钙钛矿型La_(2)MgTiO_(6):Eu^(3+)红色荧光粉的基础上,分别与Y^(3+)、Gd^(3+)与Eu^(3+)共掺杂,进行了红色荧光强度增强作用的研究。采用XRD和PL光谱分析,研究了掺杂Y^(3+)、Gd^(3+)对La_(2)Mg-TiO_(6):Eu^(3+)红色荧光粉的晶体结构和荧光发光性能等的影响。确定了各组分的优化含量比,制备得到了单相Y^(3+)、Gd^(3+)掺杂的La_(2)MgTiO_(6):Eu^(3+)高纯红色荧光粉样品。掺杂的Y^(3+)、Gd^(3+)进入晶格后,合成样品的XRD衍射峰向大角度方向发生了偏移。合成样品在394nm近紫外光的激发下,获得了主发射峰位于618nm处的红光发射峰。Gd^(3+)和Y^(3+)的掺入对合成样品具有显著的红光增强作用,Y^(3+)的增强效果最显著,色坐标值更靠近标准红光,可有效调节半导体照明白光LED的色温。实验结果表明,在近紫外激发白光LED领域,La_(1.68-x)Y_(0.32)MgTiO_(6):Eu^(3+)是一种极具应用前景的红色荧光材料。

In this paper,based on the successful synthesis of rare-earth Eu^(3+)-doped double perovskite La_(2)MgTiO_(6):Eu^(3+)red phosphor by combustion method,the enhancement effect of red fluorescence intensity was studied by co-doping Y^(3+)and Gd^(3+)with Eu^(3+),re­spectively.The effects of doping Y^(3+)and Gd^(3+)on the crystal structure and fluorescence luminescence properties of La_(2)MgTiO_(6):Eu^(3+)red phosphor were investigated by XRD and PL spectral analysis.The optimized content ratio of each component was determined,and the single-phase Y^(3+)and Gd^(3+)doped La_(2)MgTiO_(6):Eu^(3+)high-purity red fluorescent sample was obtained.However,the entry of doped Y^(3+)and Gd^(3+)into the crystal lattice caused the XRD diffraction peaks of the synthesized samples to be shifted in the large-an­gle direction.A red emission peak at 618nm was obtained under the excitation of 394nm near ultraviolet light.The incorporation of Gd^(3+)and Y^(3+)had a significant enhancement effect on the red light of the synthesized samples,and Y^(3+)had the most significant en­hancement effect.The color coordinate value was closer to the standard red light,which could effectively adjust the color temperature of the semiconductor lighting white LED.The results indicated that La_(1.68-x)Y_(0.32)MgTiO_(6):Eu^(3+)was a promising red fluorescent material in the field of near-UV excitation white LED.