白光发光二级管用红色荧光粉LiSrBO_3:Eu^(3+)的制备与发光性能研究  

Preparation and photoluminescence of LiSrBO_3:Eu^(3+) red-emitting phosphors for white leds

作　　者：刘红利[1,2] 郝玉英[2] 许并社[1] 

机构地区：[1]太原理工大学新材料中心,太原030024 [2]太原理工大学物理与光电工程学院,太原030024

出　　处：《物理学报》2013年第10期445-450,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:21071108;60976018;21101111);教育部长江学者与创新团队发展项目(批准号:IRT0972);国家国际合作专项(批准号:2012DFR50460);山西省自然科学基金(批准号:2010021023-2);太原理工大学校青年基金(批准号:2012L082)资助的课题~~

摘　　要：采用高温固相法制备了LiSrBO3:xEu3+荧光粉,并通过X射线衍射,红外和荧光光谱等对其表征.结果表明,LiSrBO3:Eu3+荧光粉可被波长为395nm的紫外线和466nm的蓝光有效激发,且发射主波长为612nm(Eu3+的电偶极跃迁5D0→7F2)的红光.研究了Eu3+掺杂浓度对LiSrBO3:Eu3+材料发光强度的影响,Eu3+掺杂浓度为6%时样品的发射强度最大,并且证实Eu3+之间的能量传递机制为电偶极子-电偶极子相互作用.Li+,Na+,K+作为电荷补偿剂的引入全部导致LiSrBO3:Eu3+材料发射强度增强,其中,Li+的引入要优于Na+和K+.少量Al3+的掺杂降低了Eu3+所处格位的对称性,增强了Eu3+的612nm的电偶极发射,改善了LiSrBO3:Eu3+红色材料的色纯度.LiSrBO3：xEu3＋ phosphors were synthesized by conventional solid-state reaction and were systematically characterized by powder X-ray diffraction,Fourier transform infrared spectroscopy and photoluminescence spectroscopy.The excitation and emission spectra reveal that the LiSrBO3：Eu3＋ phosphor can be effectively excited by ultraviolet（395 nm）and blue（466 nm）light and exhibits a satisfactory red performance which peaked at around 612 nm corresponding to the 5D0 → 7F2 transitions of Eu3＋.The concentration quenching mechanism was verified to be a dipole-dipole interaction.The dopant R＋（R＋ = Li＋,Na＋ and K＋）as charge compensator can further enhance luminescence intensity,and the emission intensity of the phosphor doped with Li＋ is higher than that doped with Na＋ or K＋.Introduction of Al3＋ reduced the symmetry of the crystal field and increased the emission of 612 nm（5D0 → 7F2）,which improved the chromaticity coordinates of LiSrBO3：Eu3＋ phosphor.

关 键 词：白光发光二级管 光致发光 浓度猝灭 电荷补偿剂 

分 类 号：O482.31[理学—固体物理]