Eu^(2+)在KCaPO_4中的发光及晶体学格位  

Luminescence and crystallographic sites of Eu^(2+) in KCaPO_4

作　　者：李盼来[1] 王蕴珠[2] 王志军[1] 郭庆林[1] 杨志平[1] 

机构地区：[1]河北大学物理科学与技术学院,河北保定071002 [2]河北大学计算中心,河北保定071002

出　　处：《光电子．激光》2011年第9期1352-1355,共4页Journal of Optoelectronics·Laser

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：采用高温固相法制备了KCaPO4:Eu2+蓝绿色荧光粉,研究了材料的发光特性。在400 nm近紫外光激发下,材料呈非对称的单峰发射,主峰位于487 nm。监测487 nm发射峰,对应的激发光谱覆盖300~450 nm,说明材料能够很好的吸收紫外-近紫外光,发射蓝绿色光。利用van Uitert公式计算了Eu2+取代KCaPO4中Ca2+时所占晶体学格位,得出478 nm和527 nm发射分别归属于八配位和六配位的Eu2+发射。研究了Eu2+掺杂浓度对KCaPO4:Eu2+材料发射强度的影响,结果显示,随Eu2+浓度的增大,材料的发射强度呈现出先增大后减小的趋势,强度最大处对应的Eu2+浓度为3%。利用Dexter理论对Eu2+发射的浓度猝灭机理进行了研究,结果表明,其源于电偶极-电偶极相互作用。A blue-greenish phosphor,KCaPO4：Eu^2＋,was prepared by the high temperature solid-state method,and its luminescent characteristics were investigated.The emission and excitation spectra indicate that it can be effectively excited by ultraviolet and near ultraviolet（300-450 nm） light,and exhibits satisfactory bluegreenish performance（487 nm）.The crystallographic sites of Eu^2＋ in KCaPO4 were calculated by the van Uitert formula.The results show that the 478 nm emission band originates from the eight sites of Eu^2＋,and the 527 nm emission band comes from the six sites of Eu^2＋.The effect of Eu^2＋ content on the emission intensity of this phosphor was investigated.The results show that the intensity firstly increases with increasing Eu^2＋ content,then decreases,and reaches the maximum at 3% Eu^2＋.The concentration quenching mechanisms are from the d-d interaction by Dexter theory.

关 键 词：白光发光二极管(LED) KCaPO4:Eu^2+ 发光特性 晶体学格位 

分 类 号：O614[理学—无机化学] O482.31[理学—化学]