摘要
采用预先球磨、再二次热处理的高温固相合成法,制备了一系列白光LED用红色荧光粉CaWO4:Eu3+,L i+,B i3+,利用XRD,SEM和荧光光谱测试对其进行表征。XRD分析表明,所合成的样品为单一的四方晶系CaWO4,Eu3+,L i+,B i3+离子的先后掺杂使基质的部分衍射峰峰位向小角度移动;SEM照片显示,经过预先球磨制备的样品颗粒比较均一,尺寸约为0.5~3μm范围,结晶性好;荧光光谱测试发现这一系列荧光粉不仅可以被紫外光(254 nm)激发,还能被近紫外光(393 nm)和蓝光(465 nm)有效激发,其主发射峰值位于616 nm(Eu3+离子的5D0→7F2跃迁)的红光;另外详细研究了预先球磨的效果、加入H3BO3做助熔剂的质量分数以及Eu3+,L i+,B i3+离子单掺或多掺时的浓度对该体系荧光粉发光特性的影响。
Novel red light-emitting phosphors of（Ca,Eu,Li,Bi）WO4 for white LEDs were synthesized by pre-milling and reheat treatment of high temperature solid-state reaction route.The samples were characterized by means of X-ray diffraction,scanning electron microscopy and photoluminescence spectra.The XRD patterns showed that the synthesized crystalline powders were sole tetragonal system CaWO4,and the host of part diffraction peaks moved to a smaller angle with the doping of Eu3＋,Li＋,Bi3＋ ions.The SEM photographs showed that the particle size of pre-milling samples had homogeneity with range of 0.5~3 μm.A few pores appeared in the sintering samples after adding flux.The photoluminescence spectra indicated that this series could not only be excited by UV light（254 nm）,but also be excited by near-UV（393 nm） and blue light（465 nm）,and the main emission peak was at 616 nm（Eu3＋ ion of 5D0→7F2 transition）.And the Eu3＋ ion was found to be located at anti-inversion symmetry in the system.Moreover,the effect of pre-ball-milling,the flux content of H3BO3,and influence of Eu3＋,Li＋,Bi3＋ ions on the luminescent properties in this novel system were discussed.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2010年第5期536-542,共7页
Journal of the Chinese Society of Rare Earths
基金
山东省烟台大学学生科技创新项目(20090711)资助
