Yb^(3+)浓度对Er:Yb掺杂SiO_2:PbF_2玻璃上转换荧光强度的影响

Upconversion fluorescence intensity as a function of Yb^(3+) concentration from Er^(3+):Yb^(3+) co-doped SiO_2 :PbF_2 glasses

将Er2 O3 和Yb2 O3 掺杂到SiO2 和PbF2 混合物中 ,烧结后 ,制成约 2mm厚的薄片样品 ,为了便于比较而获得最佳的Yb3 离子浓度使上转换荧光峰强度最强 ,各样品中SiO2、PbF2 和Er2 O3 的摩尔百分比是固定的 ,Yb2 O3 的浓度分别使用了 0 .6mol %、1.4mol%、2 .40mol %、4.6 6mol %和 8.0mol% .在 930nmLED激发下 ,测量了这五种样品的荧光光谱 ,观察到上转换谱线主要有绿光 (约 5 2 8nm、5 40nm、5 47nm和 5 5 0nm)、红光 (约 6 5 2nm、6 6 5nm和 6 6 8nm)、蓝光 (约 487nm和 493nm)、紫光 (约 412nm)和近红外光 (约 80 2nm、845nm、85 2nm) .发现对于以上五种Yb2 O3 浓度的样品其浓度为 2 .4mol%样品上转换荧光的峰强度是最强的 ,其中绿光比其它谱线更强 .

Er:Yb co-doped SiO 2 :PbF 2 glasses were formed by sintering technique. Yb 2 O 3 concentration was changed from 0.6 mol% to 1.4 mol%, 2.4 mol%, 4.66 mol%, and 8.0 mol%, while SiO 2 and PbF 2 were equal and fixed in all the samples. The sample thickness was 2 mm. The fluorescence was excited at 930 nm. Violet (412 nm), blue (487, 493 nm), green (528, 540, 547, 550 nm), red (652, 665, 668 nm), and near-infrared (802, 845, 852 nm) emission bands were observed. It was found that the sample containing 2.4mol% of Yb 2 O 3 had the most intense upconversion fluorescence. Especially, green emission band was much stronger than other ones.