纳米蓝粉CaAl_2O_4:Eu^(2+)的制备与研究

Preparation and Research of Nano-scale Blue-emitting Phosphor CaAl_2O_4∶Eu^(2+)

将超声波运用于沉淀法合成了彩色PDP用纳米级蓝粉CaAl2O4∶Eu2+。用X射线粉晶衍射(XRD)、透射电镜(TEM)、荧光分光光度仪及PDP真空紫外荧光光谱测试系统对样品的性能进行了表征。XRD显示在1350℃煅烧就能得到单相的CaAl2O4基质,相对于高温固相反应法烧结温度降低了150℃;分别用高温固相法、传统的沉淀法和运用了超声波的沉淀法制备出了CaAl2O4∶Eu2+产物,结果表明运用了超声波的沉淀法制备出的纳米CaAl2O4∶Eu2+未发生团聚,粒度达70nm,相对发光强度大大提高;同时研究了Eu2+对CaAl2O4∶Eu2+的发光性能的影响,确定了Eu2+的最佳掺杂浓度;并研究了在真空紫外条件147nm激发下纳米CaAl2O4∶Eu2+的发光性能,结果表明其余辉时间为2.51ms,相对发光强度为商用PDP蓝粉BaMgAl10O17∶Eu2+的92%,色坐标y值为0.0426,比BaMgAl10O17∶Eu2+的色坐标y值小,说明纳米CaAl2O4∶Eu2+的色彩重现域更广,在PDP应用中会具有较好的前景。

Nano-scale blue-emitting phosphor CaAl_2O_4∶Eu^(2+) for color PDP was prepared by precipitation method using ultrasonic radiation. The phosphor was characterized by XRD,TEM, fluorescence spectrophotometer and PDP vacuum ultraviolet fluorescence spectroradiomentric system. The XRD patterns show that the product prepared at 1 350 ℃ is single phase CaAl_2O_4 host,which is 150 ℃ lower than that of high temperature solid state reaction. The products of CaAl_2O_4∶Eu^(2+) were prepared by high temperature solid state reaction, traditional precipitation method and precipitation method using ultrasonic radiation, respectively. The result shows that the product obtained by ultrasonic-precipitation (method) cannot form agglomeration and the particles size is 70 nm,and the relative luminescent (intensity) was improved greatly. Meanwhile the influence of Eu^(2+) on the luminescent performance of CaAl_2O_4∶Eu^(2+) was investigated, and the optimal doping dosage of Eu^(2+) was ascertained. Furthermore, the luminescent properties of nanosized CaAl_2O_4∶Eu^(2+) under 147 nm vacuum ultraviolet (VUV) excitation were investigated, and the results show that the decay time of the product is (2.43) ms and relative luminescent intensity of it is 92 % of that of commercial blue-emitting phosphors BaMgAl_(10)O_(17)∶Eu^(2+),and the color coordinates y value of it is 0.042 6 and lower than that of BaMgAl_(10)O_(17)∶Eu^(2+),which means that the color reproduction range by using CaAl_2O_4∶Eu^(2+) is wider than that of BaMgAl_(10)O_(17)∶Eu^(2+),so the obtained product can be widely applied to PDP.