Eu^(2+)在KNaCa_2(PO_4)_2中的发光及晶体学格位  

Luminescence and Crystallographic Sites of Eu^(2+) in KNaCa_2(PO_4)_2

作　　者：王志军[1] 李妍[2] 王颖[1] 李盼来[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,保定071002 [2]河北大学化学与环境科学学院,保定071002

出　　处：《无机材料学报》2011年第7期731-734,共4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);发光与光信息技术教育部重点实验室研究基金(2010LOI12)~~

摘　　要：采用高温固相法制备了KNaCa2(PO4)2:Eu2+蓝色荧光粉,并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470 nm.监测470 nm发射峰,对应的激发光谱覆盖200~450 nm,主峰位于400 nm,说明材料能够很好的吸收紫外?近紫外光,发射蓝色光.利用van Uitert公式计算了Eu2+取代KNaCa2(PO4)2中Ca2+时所占晶体学格位,得出461和502 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KNaCa2(PO4)2:Eu2+材料发射强度的影响,结果显示Eu2+的最佳掺杂浓度为1mol%,利用Dexter理论得出其浓度猝灭机理为电偶极?电偶极相互作用.A blue phosphor,KNaCa2（PO4）2：Eu2＋,was prepared by the high temperature solid-state method,and its luminescent characteristics were investigated.The spectral characteristics show that it can be effectively excited by near ultraviolet light（400 nm）,and exhibits blue light（470 nm）.The crystallographic sites of Eu2＋ in KNaCa2（PO4）2 are calculated by van Uitert formula.In KNaCa2（PO4）2：Eu2＋,the emission band centered at 461 nm originates from the Eu2＋ center of the eight compounds,and the emission band centered at 502 nm originates from the Eu2＋ center of the six compounds.The influence of Eu2＋ concentration on the emission intensity of the phosphor is investigated.The re-sult shows that the emission intensities firstly increase with the increase in Eu2＋ concentration,reach a maximum at 1mol% Eu2＋,and then decrease.The concentration quenching mechanisms are the d-d interaction by Dexter theory.

关 键 词：白光LED KNaCa2(PO4)2:Eu2+ 发光 晶体学格位 

分 类 号：O644[理学—物理化学] O482[理学—化学]