Na2CaSiO4：Sm^3＋，Eu^3＋荧光粉的发光特性和能量传递  

Luminescence properties and energy transfer of Na_2CaSiO_4:Sm^(3+),Eu^(3+) phosphor

作　　者：苏小娜 万英[1] 周芷萱[1] 吐沙姑·阿不都吾甫 胡莲莲 艾尔肯·斯地克[1] 

机构地区：[1]新疆师范大学,新疆矿物发光材料及其微结构实验室,乌鲁木齐830054

出　　处：《物理学报》2017年第23期91-97,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:11464045)资助的课题~~

摘　　要：利用高温固相法合成Na_2CaSiO_4:Sm^(3+),Eu^(3+)系列荧光粉末,研究了Sm^(3+)和Eu^(3+)掺杂对Na_2CaSiO_4晶体结构的影响、材料发光特性以及存在的能量传递现象.X射线衍射结果表明Sm^(3+)和Eu^(3+)单掺及共掺样品均为单相的Na_2CaSiO_4结构,晶体结构没有改变.Na_2CaSiO_4:Sm^(3+)荧光样品在404 nm激发波长下呈现峰峰值为602 nm的橙红色荧光,来源于~4G_(5/2)→~6H_(7/2)跃迁.Na_2CaSiO_4:Eu^(3+)荧光样品在395 nm激发波长下发射出峰峰值为613 nm的红色荧光.对光谱和荧光寿命的测试和分析结果表明Sm^(3+)与Eu^(3+)之间存在能量传递,通过理论计算得到Sm^(3+)和Eu^(3+)之间的能量传递临界距离为1.36 nm,相互作用形式为电四极-电四极相互作用.随着Eu^(3+)掺杂浓度的增加,能量传递效率也逐渐提高至20.6%.A series of Na2CaSiO4：Sm3＋, Eu3＋ phosphors is prepared by the high-temperature solid-state reaction method at 1150℃, and their crystal structures, luminescent properties and energy transfer phenomenon influenced by Sm3＋ and Eu3＋ are studied. The X-ray diffraction results indicate that the samples single-and co-doped with Sm3＋ and Eu3＋ keep single-phase and no impurity phases are observed. At the excitation wavelength of 404 nm, the Na2CaSiO4：Sm3＋ samples emit narrow-band spectral fluorescence with lines composed of peak-to-peak values of 565, 602, 650, 713 nm, which correspond to the electronic transitions of Sm3＋ from the ground state level 4G5/2 to 6H5/2, 6H7/2, 6H9/2, and 6H11/2. On the other hand, the Na2CaSiO4：Eu3＋ sample exhibits red emission with a peak-to-peak value of 613 nm at the excitation wavelength of 395 nm. The analyses of the spectrum and lifetime of fluorescence show that with the increase of Eu3＋ content, the emission intensity of Sm3＋ decreases and the emission intensity of Eu3＋ increases. Moreover, the lifetime corresponding to Sm3＋ at 602 nm decreases gradually. It is indicated that the energy transfers from Sm3＋ to Eu3＋. The critical distance of energy transfer is 1.36 nm, which is calculated by the concentration quenching method. The energy transfer mechanism is ascribed to the quadrupole-quadrupole interaction. As the Eu3＋ doping concentration increases, the transfer efficiency increases to 20.6%. In conclusion, the Na2CaSiO4：Sm3＋, Eu3＋ phosphors may be used as a red component for white light-emitting diodes.

关 键 词：Na2CaSiO4 Sm3+ Eu3+ 红色发光材料 能量传递 

分 类 号：O482.31[理学—固体物理]