KCaPO_4∶Tb^(3+)绿色荧光粉的发光特性  

Luminescent characteristics of KCaPO_4∶Tb^(3+) green 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,河北保定071002

出　　处：《功能材料》2011年第5期884-887,共4页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(50902042);河北省自然科学基金资助项目(E2009000209E2010000283);河北省教育厅基金资助项目(2009313);发光与光信息技术教育部重点实验室研究基金资助项目(2010LOI12)

摘　　要：采用高温固相法合成了KCaPO4∶Tb3+绿色荧光粉,并研究了材料的发光性质。KCaPO4∶Tb3+材料呈多峰发射,发射峰为437、490、545、587和623nm,分别对应Tb3+的5 D3→7F4和5 D4→7FJ=6,5,4,3跃迁发射,主峰为545nm;监测545nm发射峰,所得激发光谱由4f75d1宽带吸收(200～330nm)和4f-4f电子吸收(330～400nm)组成,主峰为380nm。研究了Tb3+掺杂浓度,电荷补偿剂Li+、Na+、K+和Cl-,及敏化剂Ce3+对KCaPO4∶Tb3+材料发光强度的影响,结果显示,调节激活剂浓度、添加电荷补偿剂或敏化剂均能较大程度地提高材料的发光强度。A green phosphor,KCaPO4∶Tb3＋,was synthesized by the high temperature solid state reaction method.Li2CO3,Na2CO3,K2CO3,CaCO3,NH4H2PO4,NH4Cl,Tb4O7 and CeO2 were used for starting materials.After these individual materials were blended and grounded thoroughly in an agate mortar,the homogeneous mixture was heated at 900℃ for 3h,and then the phosphors were obtained.The phase present of the samples was characterized by a powder X-ray diffraction.The spectral characteristics of the phosphors were measured by a SHIMADZU RF-540 fluorescence spectrophoto-meter.KCaPO4∶Tb3＋ shows several emission peaks,and locates at 437,490,545,587 and 623nm,which correspond to the 5D3→7F4 and 5D4→7FJ=6,5,4,3 transition of Tb3＋,respectively,and the main emission peak is 545nm.Monitored at 545nm emission,the excitation spectrum consists of several bands,and the main peak locates at 380nm.The effects of Tb3＋ doping content,the compensators（Li＋,Na＋,K＋ or Cl-）,and the sensitize activator Ce3＋ on the emission intensity of KCaPO4∶Tb3＋ phosphor were studied.The results show that the emission intensity can be enhanced by select the prime condition.

关 键 词：白光LED KCaPO4∶Tb3+ 发光特性 

分 类 号：O644[理学—物理化学] O482.31[理学—化学]