中国物理B ›› 2009, Vol. 18 ›› Issue (10): 4524-4531.doi: 10.1088/1674-1056/18/10/071
黄平, 崔彩娥, 王森
Huang Ping(黄平), Cui Cai-E(崔彩娥)†, and Wang Sen(王森)
摘要: A type of red luminescent Sr3Al2O+:Eu2+, Dy3+ phosphor powder is synthesised by sol--gel--combustion processing, with metal nitrates used as the source of metal ions and citric acid as a chelating agent of metal ions. By tracing the formation process of the sol--gel, it is found that it is necessary to reduce the amount of NO3- by dropping ethanol into the solution for forming a stable and homogeneous sol--gel. Thermogravimetric and Differential Scanning Calorimeter Analysis, x-ray diffractionmeter, scanning electron microscopy and photoluminescence spectroscopy are used to investigate the luminescent properties of the as-synthesised Sr3Al2O6:Eu2+, Dy3+. The results reveal that the Sr3Al2O6 crystallises completely when the combustion ash is sintered at 1250~℃. The excitation and the emission spectra indicate that the excitation broadband lies mainly in a visible range and the phosphors emit a strong light at 618~nm under the excitation of 472~nm. The afterglow of (Sr0.097Eu0.03Dy0.03)3Al2O6 phosphors sintered at 1250~℃ lasts for over 1000 s when the excited source is cut off.
中图分类号: (Sol-gel processing, precipitation)