摘要
首次采用高温固相法制备了YVO4∶Ce3+荧光粉,对不同Ce3+掺杂浓度下XRD图样与国际标准衍射卡对比后发现在1100℃保温9 h合成的Ce3+∶YVO4为四方晶系结构,随保温时间延长,结晶程度更好,但时间再长时,结晶变化已不大.荧光光谱表明,激发光谱为双峰结构,主峰在232,403 nm.发射光谱为一宽带,峰值在424nm附近.还发现,最佳Ce3+掺杂质量浓度为5%.研究认为Ce3+∶YVO4荧光粉可以满足与蓝光LED复合产生自然白光的要求.
The YAG phosphors emit yellow light excited by the blue light and the two lights mix into white light. The synthesis and properties of YVO4 ： Ce^3 ＋ phosphor is studied. Several methods of synthesizing phosphors are introduced,and the YVO4 ：Ce^3＋ phosphor is synthesized by solid-state reaction in reductive atmosphere. XRD pattern shows that the structure of the phosphor, is tetragonal which is formed under the sintering of 1 100 ℃ . The excitation spectra of YVO4 ： Ce^3 ＋ phosphor have two peaks, the major one is around 232 nm which is attributed to the 4f-5d transitions of Ce^3 ＋ ions. The emission band is quite wide, ranged yellow-green light region and with a center at 424 nm. Experimental results show that the concentration of Ce^3＋ ions effects the luminescent properties of YVO4 ： Ce^3 ＋ phosphor. The best concentration of Ce^3＋ is optimized by comparing the luminescent intensities of YVO4 phosphors with different Ce^3＋ concentrations.
出处
《河北师范大学学报（自然科学版）》
CAS
北大核心
2009年第6期737-739,共3页
Journal of Hebei Normal University：Natural Science
基金
廊坊市科技局科研基金(2007050204)
关键词
白光LED
YVO4∶Ce3+荧光粉
固相反应
荧光光谱
white light-emitting diode （white LED）
YVO4 ： Ce^3 ＋ phosphor
solid-state reaction method
luminescent spectra
