新型橙红色荧光粉KNaCa_2(PO_4)_2:Sm^(3+)的发光性能  

Luminescence Properties of Novel Orange Reddish Emitting Phosphors KNaCa_2(PO_4)_2:Sm^(3+)

作　　者：杨志平[1] 刘鹏飞[1] 李娇娇[1] 吕梁[2] 赵引红[1] 董宏岩[1] 侯春彩[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]河北大学电子信息工程学院,河北保定071002

出　　处：《硅酸盐学报》2013年第6期782-788,共7页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(50902042);河北省自然科学基金(F2009000217)资助项目

摘　　要：利用高温固相法合成了KNaCa2(PO4)2:Sm3+系列橙红色荧光粉,并对其发光性能进行了研究。样品的激发光谱在402nm有很强的发射带,与近紫外LED芯片匹配。在402nm近紫外光激发下,KNaCa2(PO4)2:Sm3+的发射光谱由3个峰组成,发射峰值位于569、601和648nm处,分别归属于Sm3+的4G5/2→6HJ/2(J=5,7,9)跃迁。随着Sm3+掺量的增加,样品发光强度先增强后减弱,当Sm3+掺量为0.02 mol时发光强度达到最大,浓度猝灭机理为电偶极–电偶极相互作用。分析了不同Sm3+掺杂浓度样品的荧光衰减时间,并研究了电荷补偿剂Li+对样品发光强度的影响。样品KNaCa1.96(PO4)2:0.02Sm3+,0.02Li+发射光谱(402nm激发)的积分强度是商用红色荧光粉Y2O3:Eu3+发射光谱(253nm激发)的1.5倍。A series of orange reddish emitting phosphors of KNaCa2（POa）2：Sm3＋ were synthesized via conventional solid-state reac- tion, and its photoluminescence properties were investigated. The excitation spectra of KNaCa2（PO4）2：Sm3＋ phosphors reveal inten- sive excitation bands at 402 nm, which match with near-UV LED chips. The emission spectra of the phosphors exhibit three peaks composed of emission peak at 569, 601 and 648 nm, respectively, due to the 4G_5/2→6H_J/2 （J= 5, 7, 9） transitions of Sm3＋. The lumi- nescence intensity firstly increases and then decreases with increasing Sm3＋-doped amount. The emission reaches the maximum in- tensity at Sm3＋-doped amount of 0.02 mol, and the concentration quenching mechanism is the electric dipole--electric dipole interac- tion. The decay lifetime of the phosphors doped with different Sm3＋ amounts was analyzed. The effect of the compensators Li＋ on the emission intensity of the phosphor was also investigated. The integral intensity of the emission spectra of KNaCal.96（PO4）2： 0.02SmS＋,0.02 Li＋ phosphors excited at 402 nm is 1.5 times greater than that of Y203：Eu3＋ commercial red phosphor excited at 253 nm.

关 键 词：橙红色荧光粉 发光 电荷补偿 固相法 

分 类 号：O482.31[理学—固体物理]