作　　者： (赵鑫）; (翟永清）; (杨帅）; (孙庆琳）; (苗曼红）; (丁士文）;

机构地区： 河北大学化学与环境科学学院,河北保定071002

出　　处： 《中国照明电器》 2017年第7期20-26,共7页

摘　　要： 采用高温固相法制备了Na_2Sr_(1-x-y)P_2O_7:x Eu^(3+),y Gd^(3+)系列红色荧光粉,同时探讨了Eu^(3+)及Gd^(3+)浓度等对样品结构及发光性能的影响。结果表明:在600℃下煅烧所得样品具有与Sr2P2O7类似的结构,属斜方晶系。样品的主激发峰在394 nm左右,归属于Eu^(3+)的~7F_0→~5L_6跃迁;主发射峰位于594 nm和614nm处,分别对应Eu^(3+)的~5D_0→~7F_1磁偶极跃迁和~5D_0→~7F_2电偶极跃迁。在单掺Eu^(3+)的样品中,当其掺杂浓度x从0.02增加至0.34时,Eu^(3+)占据反演对称中心与非反演对称中心的数量之比逐渐增加,导致橙红比(I_(594)/I_(614))逐渐增大。共掺杂Gd^(3+)时,也有类似的现象。通过Gd^(3+)到Eu^(3+)的能量转移增强了Eu^(3+)的~5D_0→~7F_1跃迁发射,此发射强度在Na_2Sr_(0.4)P_2O_7:0.1Eu^(3+),0.5Gd^(3+)中达到最大。 A series of Na2r1-x-yP2O7：xEu^3＋, yGd^3＋ novel red-emitting phosphors were synthesized by a high temperature solid-state method. The effects of Eu^3＋ and Gd^3＋ concentration on the structure and properties of as-prepared samples were investigated. The results indicate that the sample synthesized at 600℃ has the similar crystal structure like Sr2P2O7, belonging to orthorhombic system. The main excitation peak of samples is at about 394 nm, ascribed to the ^7F0→^5L6 transition of Eu^3＋; the main emission peaks are located at 594 nm and 614 nm, corresponding to ^5D0→^7F1 magnetic dipole transition and ^5D0→^7F2 electric dipole transition of Eu^3＋. For the single-doped Eu^3＋ samples, the ratio of Eu^3＋ ions occupied inversion symmetry center to those occupied non-inversion symmetry center increases with the increase of Eu^3＋ concentration from 0.02 to 0.34, resulting in the ratio of orange to red （I594/I614） increases gradually. The similar tendency can be observed for Eu^3＋, Gd^3＋ co-doped Na2SrP2O7. The ^5D0→7F1 transition of Eu^3＋ is enhanced through the energy transfer from Gd^3＋ to Eu^3＋. The emission intensity of ^5D0→^7F1 transition of Eu^3＋ is the strongest in Na2Sr0.4P2O7：0.1Eu^3＋, 0.5Gd^3＋.

关 键 词： 红色荧光粉 高温固相法 发光性质