摘要
采用高温固相法合成了蓝色荧光粉KNaCa2(PO4)2:Eu2+,利用X射线衍射(XRD)和光谱技术等表征了材料的性能。结果显示,少量Eu2+的掺入并没有影响KNaCa2(PO4)2的晶体结构。在399nm近紫外光激发下,KNaCa2(PO4)2:Eu2+材料发射蓝光,发射光谱为400~600nm,主发射峰位于471nm,对应Eu2+的4f65d1→4f7跃迁发射;471nm发射峰,对应的激发光谱为250~450nm,主激发峰位于399nm,与近紫外芯片匹配很好。以365nm近紫外光作为激发源时,KNaCa2(PO4)2:Eu2+材料的发射强度约为商用蓝色荧光粉BAM:Eu2+的85%;而以399nm近紫外光作为激发源时,相较于BAM:Eu2+,KNaCa2(PO4)2:Eu2+材料具有更强的发射强度。此外,KNaCa2(PO4)2:Eu2+和BAM:Eu2+的CIE色坐标接近,均位于蓝色区域,色坐标分别为(0.154,0.154)和(0.141,0.112)。研究结果表明,KNaCa2(PO4)2:Eu2+是一种在三基色白光LED中有应用前景的蓝色荧光粉。
A blue emitting phosphor KNaCa2（PO4）2：Eu2＋was synthesized by a high temperature solid state method.Phase formation was determined by X-ray diffraction（XRD）in a Bruker AXS D8 advanced automatic diffractometer with Ni-filtered Cu Kα1radiation（λ=1.5406nm）.Steady time resolved luminescence spectra,and excitation and emission spectra were detected by a fluorescence spectrophotometer（Hitachi F-4600）.The uniform diffraction pattern means that the phase formation of KNaCa2（PO4）2is not influenced by a little amount of Eu2＋.Under 399 nm radiation excitation,KNaCa2（PO4）2：Eu2＋can produce blue emission,and emission extends from 400 nm to 600 nm,and the peak locates at471 nm corresponding to the 4f65d1→4f7 transition of Eu2＋.For the 471 nm emission,the excitation spectrum ranges from 250 nm to 450 nm,and the peak locates at 399 nm,which matches with near ultraviolet region.Under 365 nm excitation,emission intensity of KNaCa2（PO4）2：Eu2＋is 85% of that of BAM：Eu2＋,while it is highter than that of BAM：Eu2＋under 399 nm excitation.Moreover,the CIE coordinates of KNaCa2（PO4）2：Eu2＋and BAM：Eu2＋locate in the blue region,and show the similar values,such as（0.154,0.154）and（0.141,0.112）.The results mean that KNaCa2（PO4）2：Eu2＋may be a potential blue emitting phosphor for white LEDs.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2015年第3期519-522,共4页
Journal of Optoelectronics·Laser
基金
中国传媒大学理科基金(132014XNG1467)资助项目
