Structural evolution, crystallization behaviour and mid-infrared emission properties in Yb/Ho codoped oxyfluoride germanosilicate glass ceramics with varied Si/Ge ratio
Structural evolution, crystallization behaviour and mid-infrared emission properties in Yb/Ho codoped oxyfluoride germanosilicate glass ceramics with varied Si/Ge ratio
复制标题
不同Si/Ge比的Yb/Ho共掺杂氟硅酸锗玻璃陶瓷的结构演变、结晶行为和中红外发射性能
DOI：
10.1016/j.infrared.2021.103741
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发表时间：
2021-05-15
影响因子：
3.3
通讯作者：
Xu, Shiqing
中科院分区：
文献类型：
--
作者：
Tian, Ying;Liu, Qunhuo;Xu, Shiqing
通过改变氧氟锗硅酸盐微晶玻璃中Si/Ge的比例，研究了氧氟锗硅酸盐玻璃到氧氟锗酸盐玻璃的结构和析晶行为的变化，获得了具有低光散射和高效中红外发射的透明微晶玻璃。随着Ge含量的增加，氟氧化物玻璃中NaYF 4纳米晶的析晶能力降低，这可能是由于富GeO 2玻璃中氧化物和氟化物的分相减弱所致。讨论了富SiO_2和富GeO_2微晶玻璃的上转换和下转换发射光谱以及Ho ~（3+）：5I_6能级荧光衰减曲线，其中氟化物晶化引起的多声子非辐射衰减率的降低在能量传递过程中起主要作用。讨论了Si/Ge比对玻璃和微晶玻璃中2 μ m和3 μ m荧光发射的影响及其与玻璃网络结构变化的联系。优化后的Yb/Ho共掺氧氟锗硅酸盐玻璃陶瓷在2888 nm处具有低的光散射、高峰发射截面（11.18 × 10- 21 cm-2）和最大增益系数（1.387 cm-1），为基于透明氧氟玻璃陶瓷材料的新型3 μ m激光器件的开发提供了潜在的应用。
Changes in glass structure and crystallization behaviour from oxyfluoride silicate glass to oxyfluoride germanate glass were studied by modifying the ratio of Si/Ge in oxyfluoride germanosilicate glass ceramics, and transparent glass ceramic with low light scattering and efficient mid-infrared emissions were obtained. The NaYF4 nanocrystals crystallization ability of oxyfluoride glass was decreased with the increase in Ge content, which can be attributed to the weakened oxide and fluoride phase separation in GeO2-rich glass. Upconversion and downconversion emission spectra together with Ho3+: 5I6 energy level fluorescent decay curves have been discussed for SiO2-rich glass ceramics and GeO2-rich glass ceramics, in which the fluoride crystallization induced the decrease of multi-phonon non-radiative decay rates plays the main role in the energy transfer processes. The influence of Si/Ge ratio on 2 mu m and 3 mu m fluorescent emissions in glasses and glass ceramics, and its link with glass network structural changes were discussed. The optimized Yb/Ho codoped oxyfluoride germanosilicate glass ceramic with low light scattering, high peak emission cross section(11.18 x 10-21cm2) and maximum gain coefficient (1.387 cm-1) at 2888 nm provides a potential application in the development of new 3 mu m laser devices based on transparent oxyfluoride glass ceramic materials.