晶化对Nd^(3+)∶NaYF_4荧光动力学的影响  

Fluorescent Dynamics Effects of Crystallization on Nd^(3+)∶NaYF_4

作　　者：黄兴勇[1,2] 林林[3] 熊彦柔 胡旸[1] 肖芸[1] 

机构地区：[1]宜宾学院物理与电子工程学院,宜宾644007 [2]宜宾学院物理研究所,宜宾644007 [3]福建师范大学物理与能源学院,福州350007

出　　处：《人工晶体学报》2016年第7期1832-1837,共6页Journal of Synthetic Crystals

基　　金：国家自然基金青年项目(11204039);四川省教育厅资助科研项目(15ZB0294);宜宾学院培育项目资助(2015PY02);宜宾学院计算物理四川省高等学校重点实验室开放课题基金资助项目(JSWL2015KF04);2015年宜宾市科技计划项目;四川省大学生创新创业训练计划项目(201510641034)

摘　　要：采用融熔急冷法制备了前驱玻璃和与之晶化后的纳米晶结构玻璃陶瓷。利用光辐射理论,计算在两种样品中Nd^(3+)各能级的辐射跃迁几率。根据Dexter理论,得到交叉弛豫几率与Nd^(3+)相对浓度的关系。基于速率方程,描述荧光动力学过程。结果表明:晶化作用能降低Nd^(3+)各能级辐射跃迁几率,减小交叉弛豫几率,延缓动态系统趋于平衡的速率。同时,在较低Nd^(3+)相对浓度掺杂时,晶化作用提高~4F_(3/2)能级的相对粒子数,减少~4I_(9/2)能级的相对粒子数,结果显示晶化作用能有效提高1.06μm的输出。Nd^3＋：NaYF4 precursor glass and a corresponding nano-structured glass ceramic were prepared by melt-quenching process. Radiative transition probabilities were calculated by optical radiation theory. The relationship between cross relaxation probability and Nd^3＋ relative concentration was shown by Dexter theory. Fluorescent kinetic process had been proposed, and a model was built using rate equations. The results suggest that the crystallization can increase radiative lifetime of every energy level, reduce the cross relaxation probability and delayed the dynamic system tending to the steady state. Meanwhile, the crystallization has improved the relative population of ^4F3/2 energy level and lower the relative population of ^4I9/2 energy level when the lower Nd^3＋ relative doping concentration. So, crystallization effect can effectively increase the 1.06 μm output.

关 键 词：Nd^3+:NaYF4 辐射跃迁几率 交叉弛豫 速率方程 

分 类 号：O433[机械工程—光学工程]