掺Ti^(3+)的Y_2O_3微晶粉体的光谱性能  

Spectra Properties of Ti^(3+)-doped Y_2O_3 Microcrystalline Powders

作　　者：曾贵平[1] 董强[1] 姚李[1] 张庆礼[2] 邓赞红[2] 李冬青[2] 宁凯杰[2] 

机构地区：[1]合肥学院,合肥230601 [2]中国科学院安徽光学精密机械研究所,合肥230031

出　　处：《人工晶体学报》2010年第B06期139-144,共6页Journal of Synthetic Crystals

摘　　要：为寻找新型可调谐激光介质,采用共沉淀法制备出了Ti3+∶Y2O3微晶粉体,其晶相、晶粒尺寸与成分通过XRD、TEM与XPS方法进行了表征。测量了粉体的激发谱、发射谱以及荧光寿命。提出了Ti3+的一个三能级系统-2T2、2E与E(Ti3+的局域化激子能级),用该能级系统对激发与发射谱进行了合理的解释。结果显示:难以利用Ti3+的2T22E能级跃迁或2T2E能级跃迁来实现调谐激光,因为前者引起的激发带(480nm与645nm)与发射带(737nm)不强,而后者引起的发射带(439nm)中存在480nm的吸收带。In order to seek new tunable laser medium, Ti^3＋： Y2O3 microcrystalline powders were prepared by coprecipitation method. The crystal phase, particle size and composition of the powders were confirmed by means of XRD, TEM and XPS. Emission spectra, excitation spectra and fluorescence lifetimes of the powders were measured. A three-level system of Ti^3＋-^2T2, 2E and E （ localized exciton level of Ti3^＋ ）- was proposed out. The excitation and emission spectra were reasonably interpreted according to the three-level system. The results indicate that it is difficult to achieve tunable laser by utilizing of ^2T2←→^2E or ^2T2 ←→E energy levels transition of Ti^3＋ , because the excitation bands （peaks at 480 nm and 645 nm） and emission band （peak at 737 nm） caused by the former is not strong, and the 480 nm excitation band lies in the emission band （peak at 439 nm） caused by the latter.

关 键 词：共沉淀法 可调谐激光介质 掺钛氧化钇 

分 类 号：O482[理学—固体物理]