超声分散技术在制备小颗粒(Y,Gd)BO_3∶Eu~(3+)粉体中的应用

采用共沉淀法结合超声分散技术制备亚微米级红色荧光粉(Y,Gd)BO3∶Eu3+,研究了超声时间对离子混合及沉淀过程的影响,以及进而对粉体性能的影响。采用红外光谱(IR)、扫描电子显微镜(SEM)、粉末X射线衍射(XRD)、PDP真空紫外荧光粉测试系统对荧光粉的组成、结构与光学性能等进行表征,结果表明:(Y,Gd)BO3∶Eu3+中BO3]基团中B原子以四配位为主,同时混有三配位,主体基质YBO3以六方碳钙石结构存在,空间群为P63/mmc(194),晶胞参数a=3.778,c=8.814;在离子混合和沉淀过程中经过超声分散制备的粉体与未经超声分散制备的粉体相比较,相对发光强度提高,色坐标红移(x=0.6392,y=0.3604→x=0.6422,y=0.3575),红橙比(626nm/592nm)提高12%,粒径细小,颗粒形貌均匀,分散性良好。

Application of Ultrasonic Dispersion in Preparation of Small Particles(Y,Gd)BO3:Eu3+Powder

Sub-micron of red phosphor (Y, Gd)BO3:Eu3+ was prepared by co-precipitation method combined with ultrasonic dispersion. The effects of ultrasonic time on the ion-mixing and the precipitation process, thereby the effect on the performance of powders were studied. The composition, structure and optical properties under VUV were characterized by using infrared spectroscopy (IR), scanning electron microscopy (SEM), powder X-ray diffraction (XRD), PDP VUV phosphor test system.The results showed that BO3] groups in (Y,Gd)BO3:Eu3+ is four-coordinate-based with a mixture of three-coordinate, (Y,Gd)BO3 is structure of vaterite, the space group is P63/mmc (194), with cell parameters are a=3. 778, c=8. 814. Comparing the powder prepared by using ultrasonic dispersion in the process of ion mixing and precipitation with the powder prepared by not using ultrasonic dispersion, the relative luminescence intensity increases, color coordinates a red shift (x= 0. 639 2, y=0. 360 4→x=0. 642 2, y= 0. 357 5), R/O (626 nm/592 nm) increases by 12%, particle size is about 600 nm. And it has a small uniform particle morphology and a good dispersion performance.