摘要
Er/Ho co-doped oxyfluoride germanosilicate glass and glass ceramics are prepared and compared. The results indicate that the glass consists of SiO_4 and GeO_4 structural units, while the network of the glass ceramics consists of SiO_4, GeO_4, and GeO_6 units together with NaYF_4 nanocrystals. The presence of multiple local structures in glass ceramics creates a range of dipole environments, which is beneficial to the broadening of 2.7 μm emission.Two other reasons are attributed to the broadening of 2.7 μm emission in glass ceramics: the energy-level splitting of Er^(3+) and the enhancement of the Ho^(3+):~5I_6→~5I_7 transition in NaYF_4 nanocrystals.
Er/Ho co-doped oxyfluoride germanosilicate glass and glass ceramics are prepared and compared. The results indicate that the glass consists of SiO4 and GeO4 structural units, while the network of the glass ceramics consists of SiO4, GeO4, and GeO6 units together with NaYF4 nanocrystals. The presence of multiple local structures in glass ceramics creates a range of dipole environments, which is beneficial to the broadening of 2.7 μm emission. Two other reasons are attributed to the broadening of 2.7 μm emission in glass ceramics： the energy-level splitting of Er3＋ and the enhancement of the Ho^3＋ ：^5I6 → ^5I7 transition in NaYF4 nanocrystals.
基金
National Natural Science Foundation of China(NSFC)(51472225,61775205,51372236,61605192)
Natural Science Foundation of Zhejiang Province(LD18F050001)
