Bi_4Si_3O_(12):Sm^(3+)荧光粉的制备及发光性能的研究  

Synthesis and Luminescence Properties of Bi_4Si_3O_(12):Sm^(3+) Phosphor

作　　者：张方圆[1] 谢建军[1] 汪暾 林德宝[1] 肖维勤 施鹰[1] 雷芳[1] 章蕾[1] 

机构地区：[1]上海大学材料科学与工程学院,上海200444

出　　处：《人工晶体学报》2017年第8期1493-1497,共5页Journal of Synthetic Crystals

基　　金：上海市科研计划能力建设项目(14520500300);国家自然科学基金(21301115;61475097)

摘　　要：采用溶胶凝胶法制备了Bi_4Si_3O_(12):Sm^(3+)荧光粉体,并用X射线衍射(XRD)、扫描电镜(SEM)和荧光光谱(PL)对Bi_4Si_3O_(12):Sm^(3+)荧光粉的结构和发光性能进行表征。研究发现:在850℃煅烧下得到Bi_4Si_3O_(12)纯相;PL谱表明该粉体从近紫外到蓝光范围内都可以得到有效激发。在紫外光激发下,产物有4个发射峰,分别位于468 nm和563 nm,600 nm,649 nm,归属于Bi^(3+)的3P1→1S0跃迁和Sm^(3+)的~4G_(5/2)→~6H_J(J=5/2,7/2,9/2)能级跃迁,并对Bi^(3+)和Sm^(3+)之间的能量传递机制进行讨论。在467 nm的蓝光激发下粉体呈现橙黄色发光,发射峰来源于Sm^(3+)的~4G_(5/2)→~6H_J特征辐射跃迁,且最强发射峰位于563 nm处,Sm^(3+)的最佳掺杂浓度为3mol%。Bi4Si3O（12）：Sm^（3＋）phosphors were prepared by a sol-gel technique. The crystal structure and its luminescence properties were investigated by X-ray diffraction（ XRD）,scanning electron microscopy（ SEM） and fluorescence spectra（ PL）. The phase of the synthesized samples calcinated at 850 ℃ is pure Bi4Si3O（12） according to X-ray diffraction results. The luminescence spectra shows that Bi4Si3O（12）：Sm^（3＋）phosphors could be excited effectively by the light from ultraviolet ray to blue light. The energy transfer process from Bi^（3＋） to Sm^（3＋）under 260 nm excitation was discussed. The obtained phosphors exhibites a strong band at 468 nm belonging to the^3P1→^1S0transition of Bi^（3＋）,and another three emissions peaks at563 nm,600 nm,and 649 nm,which comes from ^4G（5/2）→^6HJ（ J = 5/2,7/2,9/2） transition of Sm^（3＋）.While under excitation with 467 nm,only characteristic emission of Sm^（3＋）corresponding to the ^4G（5/2）→^6HJ（ J = 5/2,7/2,9/2） transition are found. The optimum dopant concentration of Sm^（3＋）in（ Bi（1-x） Smx）4Si3O（12） is 3mol%.

关 键 词：Bi4Si3O12:Sm3+荧光粉 溶胶凝胶法 发光性能 白光LED 

分 类 号：O482.31[理学—固体物理]