Er^(3+)/Yb^(3+)共掺杂的氟氧化物玻璃陶瓷中新的能量传输过程(英文)

A NEW CHANNEL OF ENERGY TRANSFER IN OXYFLUORIDE GLASS DOPED WITH Er^(3+)/Yb^(3+)

为了研究铒离子的发光和氟氧化物玻璃中形成的氟化物微晶的关系 ,制备了三种掺铒的氟氧化物玻璃 .用X射线衍射分析了样品中形成的氟化物微晶 .从 6 32 .8nm激光激发时的发射光谱中 ,首次发现了一种新的氟氧化物玻璃基质发光的现象 .在氟氧化物玻璃中如果没有形成氟化物微晶 ,铒掺杂于玻璃中 ,6 32 .8nm激光激发时激发态的铒离子容易将能量传递给基质并引起基质发光 ;如果将镱和铒离子共同掺入氟氧化物玻璃中 ,容易形成含稀土铒镱的氟化物微晶 ,含微晶的玻璃又叫玻璃陶瓷 .由于氟化物的声子能量较小 ,6 32 .8nm激光激发时激发态的铒离子的无辐射弛豫几率较小 ,铒离子的发光较强 .在玻璃中形成含稀土氟化物微晶可以减小基质的发光强度 ,这是提高铒离子发光的有效手段之一 .

Three kinds of oxyfluoride glass were fabricated with the aim of studying the relation between Er 3+ luminescence and the fluoride micro-crystallite formed in the oxyfluoride glass. X-ray diffraction pattern showed the crystallization of the different sample. A new matrix luminescence in the oxyfluoride glass doped with Er 3+ is found firstly in PL spectrum by 632.8nm laser excitation. The excited energy in the oxyfluoride glass with few or no fluoride micro-crystallites transfers to matrix by the excited Er 3+ to cause matrix luminescence after excited by 632.8nm laser. Yb 3+ co-doping into the oxyfluoride glass doped with Er 3+ is benefit to form fluoride micro-crystallite. After excited by 632.8nm laser, the excited energy transfer to the rare earth ions and cause Er 3+ luminescence in the oxyfluoride glass-ceramics with fluoride micro-crystallites. The bright up-conversion luminescence of Er 3+ in the oxyfluoride glass-ceramics co-doped with Er 3+-Yb 3+ is obtained. Decrease the new energy transition of the matrix can increase the Er 3+ luminescent intensity.$$$$