A precursor of Ce2（C2O4）3·10H2O was prepared by solid state chemical reaction with Ce2（NO3）3·6H2Oand H2C2O4·2H2O at low heating temperature.After the precursor determined by TG-DTA,a yellow oxide wa...A precursor of Ce2（C2O4）3·10H2O was prepared by solid state chemical reaction with Ce2（NO3）3·6H2Oand H2C2O4·2H2O at low heating temperature.After the precursor determined by TG-DTA,a yellow oxide was obtained by decomposed the precursor about 2 hour at 380℃.The oxide was characterized by XRD,SEM,TEM and laser size instrument.A flake CeO2 nanometer powder about 20nm was obtained and its structure is the cubic.展开更多
以H3BO3作助熔剂,采用溶胶–凝胶法合成了Na2Zn Si O4:Eu3+红色荧光粉。用X射线衍射、荧光光谱分析对样品的结构及发光特性进行了表征,探讨了H3BO3助熔剂添加量和掺Eu3+量对Na2Zn Si O4:Eu3+发光性能的影响。结果表明:所得样品属于单斜...以H3BO3作助熔剂,采用溶胶–凝胶法合成了Na2Zn Si O4:Eu3+红色荧光粉。用X射线衍射、荧光光谱分析对样品的结构及发光特性进行了表征,探讨了H3BO3助熔剂添加量和掺Eu3+量对Na2Zn Si O4:Eu3+发光性能的影响。结果表明:所得样品属于单斜晶系,样品的激发光谱主要由一系列线状谱峰组成,激发主峰为465 nm,归属于Eu3+的7F0→5D2特征跃迁。在波长为465 nm蓝光激发下发射红光,发射峰分别为578、591、613、653和701 nm,对应于Eu3+的5D0→7FJ(J=0,1,2,3,4)跃迁,发射主峰位于613 nm(5D0→7F2)处。当Eu3+和H3BO3的摩尔掺杂量分别为5%和0.8%时,样品的荧光发光强度最大。Na2Zn Si O4:Eu3+有望成为蓝光激发的白光发光二极管(w-LED)用红色荧光粉。展开更多
文摘A precursor of Ce2（C2O4）3·10H2O was prepared by solid state chemical reaction with Ce2（NO3）3·6H2Oand H2C2O4·2H2O at low heating temperature.After the precursor determined by TG-DTA,a yellow oxide was obtained by decomposed the precursor about 2 hour at 380℃.The oxide was characterized by XRD,SEM,TEM and laser size instrument.A flake CeO2 nanometer powder about 20nm was obtained and its structure is the cubic.
文摘以H3BO3作助熔剂,采用溶胶–凝胶法合成了Na2Zn Si O4:Eu3+红色荧光粉。用X射线衍射、荧光光谱分析对样品的结构及发光特性进行了表征,探讨了H3BO3助熔剂添加量和掺Eu3+量对Na2Zn Si O4:Eu3+发光性能的影响。结果表明:所得样品属于单斜晶系,样品的激发光谱主要由一系列线状谱峰组成,激发主峰为465 nm,归属于Eu3+的7F0→5D2特征跃迁。在波长为465 nm蓝光激发下发射红光,发射峰分别为578、591、613、653和701 nm,对应于Eu3+的5D0→7FJ(J=0,1,2,3,4)跃迁,发射主峰位于613 nm(5D0→7F2)处。当Eu3+和H3BO3的摩尔掺杂量分别为5%和0.8%时,样品的荧光发光强度最大。Na2Zn Si O4:Eu3+有望成为蓝光激发的白光发光二极管(w-LED)用红色荧光粉。
