The Optimization Of Preparation Technology Of SrAl₂O₄ Luminescent Materials For Fibers

Luminous fiber is a non-toxic harmless, non-radioactive, and can be recycled functional fiber. However, the afterglow property of luminous fiber developed is not ideal. The light color (hereinafter referred to as light color) are all yellow-green at night, which is unitary., thus limiting its market. With the expanding application, luminescent properties of the luminous fiber needs to be improved. SrAl₂O₄ luminescent material is one of the main raw materials of luminous fiber, so its luminescent properties have significant influence on luminous fiber. To get better luminescence performance of luminous fibers, properties of luminescent materials must be improve radically. Therefore, it's necessary to do further research and analysis on properties of SrAl₂O₄ luminescent material acorrding to the specific requirements of luminous fibers.Firstly, in previous research-based, compare relative merits of different methods such as the solid-state reaction method, combustion synthesis, sol-gel preparation, coprecipitation method, microwave synthesis,hydrothermal method and spray drying process through theoretical analyzing. To consider in the fields of environmental protection, cost, operability and materials, choose to use high temperature solid state.The impact of the rare earth ions on the luminance properpties of phosphor were studyed from the crystal structure, excitation spectra, emission spectra, the relative brightness and afterglow properties, and the mechanism of the rare earth ions Eu²⁺, Dy³⁺ in SrAl₂O₄ luminescent material was further explained.Combination the development status and problems of luminous fiber, the luminescent materials for luminous fiber are studied and analyzed in terms of the particle size, ight color performance and afterglow properties. The results show that: If the particle size of luminescent materials for luminous fiber was larger, it's easy to block in the fiber spinning process, resulting in breakage. However, luminescent materials with smaller particle size have poor afterglow performance. The phosphor which particle size was 7-8μm had better afterglow performance, and consistent with the requirements of the luminous fiber. The emission wavelength of SrAl₂O₄ luminous material activated Eu²⁺, Dy³⁺was 520nm.The light color of luminous fiber prepared by SrAl₂O₄:Eu2 +, Dy³⁺was yellow-green ,and the change of Eu2 +, Dy3 + content did not lead to blue shift or red shift. However, Nd³⁺ doped could lead to red shift. When H3BO3 content is 0.15, the Eu²⁺ content was 0.02, and the Dy³⁺ content was 0.03, calcining 2h under the condition of 1350℃, the afterglow property of SrAl₂O₄: Eu2 +, Dy³⁺ luminescent material obtained was the best, that was a good choice for the luminescent materials for fibers.