摘要
实验制备了一类含有SrF2∶Yb3+,Tm3+及SrF2∶Yb3+,Er3+的透明发光玻璃和玻璃陶瓷,对比研究了热处理工艺对玻璃陶瓷相组成、微观结构和光谱性能的影响规律。研究表明,玻璃陶瓷具有立方SrF2纳米晶相均匀分布于玻璃基体的复相结构,利用HRTEM可观测到SrF2纳米晶相的(111)晶面,其晶粒尺度在10~30nm之间,且该析晶相中富集有Yb3+/Tm3+和Yb3+/Er3+。基于此,玻璃陶瓷在980nm LD激光激发下的上转换发光强度较玻璃样品有较大提高。其上转换发光机制分别主要为Yb3+-Yb3+之间的合作上转换,Yb3+-Tm3+和Tm3+-Tm3+之间的交叉弛豫能量传递过程,以及Yb3+-Er3+之间的能量传递上转换。
We prepared a series of transparent luminescent glass ceramics containing SrF2: Yb3+,Tm3+ and SrF2: Yb3+,Er3+nanocrystallites,and investigated their microstructure and luminescence properties.In the glass ceramic samples,SrF2 nanocrystals were embedded uniformly in the glass matrix.Such nanocrystals sized around 10~30nm,and their(111) crystal plane could be observed through high-resolution transmission electron microscopy(HRTEM).As Yb3+/Tm3+ and Yb3+/Er3+ in the glass ceramics could be enriched into the precipitated SrF2 nanocrystalline phase,which provide much lower phonon vibration energy than the glass matrix.As a result,the upconversion luminescence of the glass ceramics were enhanced a lot,compared with that of the glass when pumping with 980nm LD.The upconversion mechanisms are mainly due to Yb3+-Yb3+ cooperative upconversion,Yb3+-Tm3+ cross relaxations,Tm3+-Tm3+ cross relaxations and Yb3+-Er3+ energy transfer upconversion,respectively.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2012年第1期29-36,88,共9页
Journal of Materials Science and Engineering
基金
国家自然科学基金资助项目(50902120)
教育部博士点基金资助项目(20100101120025)
浙江省重点创新团队(科技创新类)资助项目(2009R50010)
关键词
稀土
纳米晶
玻璃陶瓷
上转换发光
rare earth
nanocrystallites
glass ceramics
upconversion