Tb掺杂SiO2-B2O3-NaF玻璃的制备及发光性质

使用正硅酸乙酯、硼酸和氟化钠为前驱体,0.10 mol•L-1TbCl3溶液为掺杂剂,通过溶胶-凝胶方法制备了Tb3＋掺杂的SiO2-B2O3-NaF玻璃,研究了Tb3＋在SiO2-B2O3-NaF体系中的发光性质,结果显示发光体能产生强的绿色发光(544 nm),归属于Tb3＋的5D4—7F5电子跃迁.Tb3＋含量不同时,除发光强度不同外,其发射光谱基本相同,并且在低掺杂Tb3＋样品和低退火温度样品中检测到了来自5D3跃迁产生的峰,其跃迁随Tb3＋掺杂浓度的增加和退火温度的升高而发生猝灭,这种现象归因于5D3－5D47F6—7F0和/或5D3—7F07F6—5D4跃迁中发生了交叉弛豫现象.Tb3＋在SiO2-B2O3-NaF玻璃中的激发光谱由一个宽峰和一系列窄峰组成,宽峰最大波长位于230 nm,对应于Tb3＋的4f 8—4f 75d 1跃迁,一系列窄峰位于300～380 nm处,归属于4f 8跃迁,所有发光材料的XRD和TEM测试显示材料是非晶态的.

Synthesis and Luminescent Properties of Tb-doped SiO2-B2O3-NaF Glass

Tb-doped SiO2-B2O3-NaF glass was prepared by sol-gel process,using tetraethoxy silcane, boric acid and sodium fluoride as precursors,0.10 mol•L－1 TbCl3 solution as the dopant. The luminescent properties of Tb3＋ doped SiO2-B2O3-NaF phosphors were investigated. The phosphors showed prominent luminescence in green, due to the electronic transition of 5D4—7F5 (Tb3＋).For all Tb3＋ concentrations used the emission spectrum was essentially the same with the exception of intensity and weak peak belonging to transition from 5D3 was detected in lower Tb3＋ doped samples and lower annealing temperature samples. The intensity of emission from 5D3 quenches with increasing of the Tb3＋ concentration and annealing temperature. The observation showed that cross-relaxation obviously took place in the transition 5D3－5D47F6—7F0 and/or 5D3—7F07F6—5D4.The excitation spectra of Tb3＋ emission in SiO2-B2O3-NaF glass consist of broad bands with a maximum at about 230 nm, corresponding to 4f 8—4f 75d 1 transition of Tb3＋ ion, and a series of sharp lines in the range of 300 to 380 nm which belong to transitions between the energy levels of the 4f 8 configuration. The structural characterization of these luminescent materials were carried by using XRD and TEM. The results showed that the phosphor was in amorphous phase.