【摘要】：以六水合硝酸鎂、硼砂、氨水為原料,在微波水熱條件下制備硼酸鎂基質(zhì),經(jīng)X射線衍射(XRD)、熱重-差熱分析(TG-DTA)、紅外光譜分析(IR)及掃描電鏡(SEM)分析表明硼酸鎂基質(zhì)的組成為7MgO·2B_2O_3·7H_2O,形貌為納米薄片團簇而成的球狀花。通過稀土鋱(Tb~(3+))摻雜,先微波水熱合成硼酸鎂熒光粉前軀體7MgO·2B_2O_3·7H_2O:Tb3+,再經(jīng)焙燒得硼酸鎂熒光粉3MgO·B_2O_3:Tb~(3+)。實驗表明,前驅(qū)體中Tb3+適宜摻雜量為1%(硝酸鋱加入量為硝酸鎂物質(zhì)的量的1%),較佳的焙燒溫度為650℃;在波長為246 nm激發(fā)光下,熒光粉以541 nm綠光發(fā)射為主,對應(yīng)5D4—7F5特征躍遷。當(dāng)Tb3+摻雜量增大時,由于發(fā)生濃度淬滅效應(yīng)而使熒光粉發(fā)光減弱。
[Abstract]:Magnesium borate matrix was prepared by using magnesium nitrate hexahydrate, borax and ammonia water as raw materials under microwave hydrothermal conditions. The matrix was characterized by (XRD), thermogravimetric differential thermal analysis (TG-DTA), X-ray diffraction (XRD), thermogravimetric analysis (TG-DTA) and differential thermal analysis (TG-DTA). (IR) and (SEM) analysis showed that the composition of magnesium borate matrix was 7MgO 2B_2O_3 _ 7H _ 2O, and the morphology was a spherical flower formed by nanoscale clusters. By doping rare earth terbium (Tb~ (3), the body 7MgO 2B_2O_3 7H_2O:Tb3 in front of magnesium borate phosphor was synthesized by microwave hydrothermal synthesis, and then the magnesia borate phosphor 3MgO _ 2O _ 3: TB ~ (3) was prepared by calcination of magnesium borate phosphor 3MgO _ B _ 2O _ 3: TB ~ (3). The experimental results show that the suitable doping amount of Tb3 in the precursor is 1% (1% of the amount of terbium nitrate is 1% of the amount of magnesium nitrate), and the optimum calcination temperature is 650 鈩，

本文編號：2365579