Eu3+掺杂BaO-TiO2-3SiO2发光材料的制备与发光性质

采用溶胶-凝胶法在室温下制备了以BaO-TiO₂-3SiO₂为基质的稀土Eu³⁺掺杂的发光材料,各材料的量比为 n(Ba):n(Ti):n(Si):n(Eu)=1:1:3:x。 通过DTA-TG、IR、XRD、激发和发射光谱对材料的结构和发光性能进行了分析。DTA-TG测试表明,样品在50~400 ℃之间出现明显失重现象,说明在此过程中凝胶中的吸附水、乙醇、醋酸等物质发生了脱附释放。IR光谱显示,制备的样品中主要存在Ti-O-Si和O-Si-O键。XRD测试证明,材料属于非晶态。激发和发射光谱图显示,材料制备的最佳退火温度为800 ℃,Eu³⁺的最佳掺杂比例为x(Eu)=5.75×10^-3。在612 nm监测波长下,测得的最佳激发波长为紫外光395 nm 和可见光465 nm,即在395 nm和465 nm光激发下,材料发射的红光单色性好且强度基本相同。

Preparation and Luminescent Properties of Eu3+-doped Luminescent Materials BaO-TiO2-3SiO2

Eu3+ doped BaO-TiO2-3SiO2 luminescent materials have been synthesized by Sol-gel method,the molar ratio of this fluorescence materials is n(Ba)∶n(Ti)∶n(Si)∶n(Eu)=1∶1∶3∶x.The crystal structure and the luminescent properties of the samples are measured and characterized by using the method of DTA-TG,IR,powder XRD and excitation and emission spectra,respectively.The DTA-TG analysis shows that the weightlessness is obvious in the temperature range of 50~400 ℃,and this phenomenon corresponds to the loss of dissociated water,ethanol and acetic acid.The IR spectra shows that the samples are mostly composed of the Ti—O—Si and O—Si—O bonds.Powder XRD analysis indicates that the samples are non-crystal material.The excitation and emission spectra show that the best annealing temperature is 800 ℃ for preparing material and the optimum Eu3+doping molar ratio is x(Eu)=5.75×10-3.It also shows that the best excitation lights are the ultraviolet light with the wavelength of 395 nm and the visible light with the wavelength of 465 nm when the wavelength of the monitoring light is 612 nm,that is to say,the monochromaticity and the luminescent intensity of red light excited from the samples are optimum and basically the same when the wavelengths of the excitation lights are 395 nm and 465 nm,respectively.