KBaPO_4:Tb^(3+)材料制备及其发光特性  

Preparation and Luminescent Characteristics of KBaPO_4:Tb^(3+) Phosphor

作　　者：王志军[1] 李盼来[1] 杨志平[1] 郭庆林[1] 

机构地区：[1]河北大学物理科学与技术学院,保定071002

出　　处：《无机材料学报》2011年第5期503-507,共5页Journal of Inorganic Materials

基　　金：国家自然科学基金(50902042);河北省自然科学基金(E2009000209,E2010000283);河北省教育厅基金(2009313)~~

摘　　要：采用高温固相法合成了KBaPO4:Tb3+绿色发光荧光粉,并研究了材料的发光性质.KBaPO4:Tb3+材料呈多峰发射,发射峰位于437、490、545、586和622 nm,分别对应Tb3+的5D3→7F4和5D4→7FJ=6,5,4,3跃迁发射,主峰为545 nm;监测545 nm发射峰,所得激发光谱由4f 7-5d1的宽带吸收(200～330 nm)和4f-4f电子吸收(330～400 nm)组成,主峰为380 nm.研究了Tb3+掺杂浓度,电荷补偿剂Li+、Na+、K+和Cl-,及敏化剂Ce3+对KBaPO4:Tb3+材料发射强度的影响.结果显示,调节激活剂浓度、添加电荷补偿剂或敏化剂均可在很大程度上提高材料的发射强度.上述结果表明KBaPO4:Tb3+材料是一种很好的近紫外光激发型高效绿色发光荧光粉.A green phosphor, KBaPO4：Tb^3＋, was synthesized by the high temperature solid-state method, using LiECO3, NaECO3, K2CO3, BaCO3, NH4H2PO4, NH4C1, Zb407 and CeO2 as starting materials. After these individual materials were blended and grounded thoroughly in an agate mortar, the homogeneous mixture was heat-treated at 950℃ for 3 h, and the phosphors were obtained. The samples was characterized by powder X-ray diffraction （XRD） （D/max-rA, Cu Kα, 40 kV, 40 mA, λ=0.15406 nm）. The spectral characteristics of these phosphors were measured by a SHIMADZU RF-540 fluorescence spectrophotometer. KBaPO4：Tb^3＋ phosphor shows several emission peaks located at 437, 490, 545, 586 and 622 nm which correspond to the 5D3→^7F4 and 5D4→^7Fj=6,5, 4, 3 transition of Tb^3＋, respectively, and the highest emission peak is 545 nm. Monitored at 545 nm emission, the excitation spectrum consists of several bands, and the highest peak locates at 380 nm. The effects of Tb3＋ doping content, the compensators （Li^＋, Na^＋, K^＋ or C1^-）, and the sensitize activator Ce^3＋ on the emission intensity of KBaPO4： Tb^3＋ phosphor are stud- ied. The results show that the emission intensity can be controlled by the above factors, and the intensity can be enhanced by the selection of the optimal condition. It indicates that KBaPO4：Tb^3＋ is a promising green phosphor for white light emitting diodes.

关 键 词：白光LED KBaPO4:Tb^3+ 发光特性 

分 类 号：O614[理学—无机化学] O482[理学—化学]