论文部分内容阅读
采用溶胶-凝胶法合成了系列Ca8Zn(SiO4)4Cl2∶Eu3+红色荧光粉.通过X射线粉末衍射、荧光光谱等对合成的荧光粉样品进行表征,并系统地研究了烧结温度、Eu3+掺杂浓度对样品发光强度的影响.结果表明:该荧光粉能被近紫外光(393 nm)有效激发;当烧结温度为800℃、Eu3+的掺杂量为5.0％(摩尔分数)时,样品发射出的荧光强度最强.Ca8 Zn(SiO4)4Cl2∶Eu3+样品的色坐标(0.684,0.316)与红色标准值(x=0.670,y=0.330)非常接近.Ca8 Zn(SiO4)4Cl2∶Eu3+是一种很好的新红色荧光粉.“,”A series of Ca8Zn(SiO4)4Cl2 ∶Eu3+ red phosphors were prepared by sol-gel method.The as-prepared samples Ca8Zn(SiO4)4Cl2 ∶Eu3+were tested by the X-ray powder diffraction (XRD) and photoluminescence spectrometer.The effects of sintering temperature and content of Eu3+ on the emission intensity of the sample were investigated.The results show that the phosphors can be efficiently excited in a near-ultraviolet (NUV) light of 393 nm.The most intensive emission intensity of the Ca8 Zn(SiO4)4 Cl2 ∶ Eu3+ phosphors,which is prepared at the sintering temperature of 800 ℃ and the Eu3+ doping concentration of 5.0 mol％,can be obtained.The chromaticity coordinates of the Ca8 Zn(SiO4) 4 Cl2 ∶ Eu3 + phosphors are (0.684,0.316),which is near the standard value of red phosphor (x =0.670,y =0.330).Ca8Zn(SiO4)4Cl2 ∶Eu3+ is a promising red phosphor for white-LED.