三步煅烧制备Sr_2SiO_4:0.03Eu^(3+)基荧光粉及其发光性能的研究

Study on the luminescence property of Sr_2SiO_4:0.03Eu^(3+) phosphors by three-step calcination solid-state method

采用三步煅烧固相法在相对较低温度条件下成功合成Sr_2SiO_4∶0.03Eu^(3+)红色硅酸盐荧光粉,且与传统的一步煅烧高温固相法(1 300℃)作对比,通过X射线衍射(XRD),场发射扫描电子显微镜(FE-SEM)及荧光分光光度计(PL)等手段对样品进行测试表征.结果表明,在三步煅烧法的烧结温度为950℃时可以制备出纯度较高、颗粒尺寸较均匀且发光性能优良的Sr_2SiO_4∶0.03Eu^(3+)红色荧光粉.激发和发射光谱表明该荧光粉可被紫外光(394 nm)和蓝光(466 nm)有效激发,在5D0→7F2跃迁辐射的主要发射峰620 nm处发射的红光最强,强度远大于594 nm处的发射峰.其CIE坐标为(0.602 5,0.391 3),接近标准的红光坐标(0.67,0.33),在固态照明以及平板显示设备上具有潜在的应用价值.

The Sr2SiO4∶0.03Eu（3＋）red phosphors were synthesized under relatively low temperature by three-step calcination solid-state method,which was compared with the traditional one-step high temperature solid-state method. The phosphors were characterized by the X-ray diffraction（XRD）,file emission scanning electron microscope（SEM）,fluorescence spectrophotometer（PL）,respectively.The results show that the Sr2SiO4∶0.03Eu（3＋）phosphors with high purity and size-uniformity and favorable fluorescence properties can be synthesized at 950 ℃. Excitation and emission spectra show that the phosphor can be effectively excited by ultraviolet（394 nm） and blue light（466 nm）.Due to the transition radiation of5D0→7F2,the main emission peak is located at 620 nm with the strongest red light emission and its intensity is much larger than the emission peak at 594 nm. The color coordinate of the phosphors can be achieved at（0.602 5,0.391 3）,which is close to the standard red light.It has potential applications in the solid state lighting and display devices.