Guo Hai, Wang Xiaofeng, Chen Jindeng, Li Fang
Department of Physics, Zhejiang Normal University, Jinhua, Zhejiang, 321004, PR China.
Opt Express. 2010 Aug 30;18(18):18900-5. doi: 10.1364/OE.18.018900.
Transparent Ag and Eu(3+) co-doped oxyfluoride glasses with composition 50SiO(2)-20Al(2)O(3)-30CaF(2) were prepared by melt-quenching technique. The structural and luminescent properties of glasses, energy transfer mechanism between luminescent centers were systematically investigated. The missing nanoparticles signals in absorption spectra, XRD patterns and TEM images, the additional broad excitation band at 325-375 nm indicate that the broad emission band at 400-700 nm is originated from very small molecule-like, non-plasmonic Ag particles (ML-Ag-particles). A perfect white light emission was realized by combining intense red emission of Eu(3+) with broad band emission of ML-Ag-particles. These results suggest that Ag and Eu(3+) co-doped oxyfluoride glasses could be potentially applied as white light-emitting phosphors for ultra-violet LED chips.
采用熔融淬火技术制备了组成为50SiO(2)-20Al(2)O(3)-30CaF(2)的透明Ag和Eu(3+)共掺杂氟氧化物玻璃。系统研究了玻璃的结构和发光性能、发光中心之间的能量转移机制。吸收光谱、XRD图谱和TEM图像中缺失的纳米颗粒信号，325-375nm处额外的宽激发带表明，400-700nm处的宽发射带源于非常小的类分子、非等离子体Ag颗粒（ML-Ag颗粒）。通过将Eu(3+)的强红色发射与ML-Ag颗粒的宽带发射相结合，实现了完美的白光发射。这些结果表明，Ag和Eu(3+)共掺杂氟氧化物玻璃有望作为紫外LED芯片的白光发射荧光粉。
