论文部分内容阅读
用柠檬酸作为燃烧剂、聚乙二醇为分散剂,采用柠檬酸凝胶燃烧法制备Er,Yb:(YGd)_2O_3纳米粉体,最佳工艺条件为:Gd~(3+)的掺杂量为30%(摩尔分数,下同),Er~(3+)的掺杂量为4%,溶液的pH为8,纳米粉体平均粒径约为65nm。样品的激发和发射光谱中,在379 nm处样品的激发峰最强,Er~(3+)的~4I_(15/2)→~4G_(11/2);在562 nm处的发射峰最强,Er~(3+)对应的跃迁为~4S_(3/2)/~2H_(11/2)→~4I_(15/2)。在562nm处出现的绿光对应Er~(3+)的~4S_(3/2)/~2H_(11/2)→~4I_(15/2)跃迁,在658nm处出现的红光对应Er~(3+)的~4F_(9/2)→~4I_(15/2)跃迁,并对其发光跃迁机制进行了讨论。
Using citric acid as the combustion agent and polyethylene glycol as the dispersant, the Er, Yb: (YGd) _2O_3 nanopowders were prepared by the citric acid gel combustion method. The optimum technological conditions were: doping of Gd ~ (3+) The content of Er 3+ was 4%, the pH of solution was 8, and the average particle size of nano-powder was about 65nm. In the excitation and emission spectra of the sample, the excitation peak at 379 nm is the strongest and the emission peak at 562 nm is the highest at ~ 4I_ (15/2) → ~ 4G_ (11/2) of Er ~ (3+) Strong, Er ~ (3 +) corresponds to the transition to ~ 4S_ (3/2) / ~ 2H_ (11/2) → ~ 4I_ (15/2). The green light appearing at 562nm corresponds to ~ 4S 3/2 / 2H 2/2 ~ 4I 15/2 of Er 3+, and the red light at 658nm corresponds to Er ~ ~ 4F_ (9/2) → ~ 4I_ (15/2) transition of (3+), and the mechanism of its luminescence transition was discussed.