fiber preparation process with SrAl_2O_4 optimization of luminescent materials

Title: fiber preparation process with SrAl_2O_4 optimization of luminescent materials
　　Author: Kim Chiu
　　Degree-granting units: the University of South
　　Keywords: SrAl_2O_4: Eu ~ (2), Dy ~ (3);; luminous fiber;; mechanism;; optical properties
　　Summary:
　　Luminous fiber is a non-toxic, non-radioactive, the functionality can be recycled fibers. But has developed the luminous afterglow properties of fiber is not ideal, at night the light color (hereinafter referred to as light color) are yellow-green color, more homogeneity, which limits its market. As applications continue to expand, luminous light-emitting properties of the fiber needs to be improved. SrAl_2O_4 luminous light-emitting material is prepared by one of the main raw Neodymium magnets material fiber, its luminescence properties have a great impact. Therefore, to further improve the luminous light-emitting properties of fiber, but also radically improve the performance of light-emitting materials. Therefore, we must address the specific requirements of luminous fibers, the performance of SrAl_2O_4 luminescent materials for further research and analysis.
　　First, in summary, based on previous studies of high-temperature solid-phase method, combustion synthesis, sol - gel method, co-precipitation method, microwave method, hydrothermal method, spray drying method is theoretically analyzed and compared advantages and disadvantages of various methods. From an environmental, cost, and the actual operational performance of manufactured goods and other considerations, decided to use high-temperature solid-phase synthesis of strontium aluminate phosphor. Light-emitting material from the crystalline phase, excitation spectra, emission spectra, the relative brightness and afterglow performance and other aspects, analysis of the luminescence of rare earth ions on the impact of material properties, and further explain the rare earth ions Eu ~ (~ (2)), Dy ~ (3) light-emitting materials in SrAl_2O_4 mechanism of action. Combination of luminous fiber status and problems of development, from particle size, performance and afterglow light color performance, etc., on the luminous fiber light-emitting materials have been studied and analyzed. The results show that: for the preparation of luminous fiber light-emitting materials, if the larger particle size, easy to block in the fiber spinning process, resulting in breakage; but smaller particle size, persistence and poor performance. Considering the particle size of 7-8μm powder, luminous fibers consistent with the requirements of the light-emitting materials, but also has good performance afterglow. Eu ~ (~ (2)), Dy ~ (3) were http://www.chinamagnets.biz/Neodymium/Ball-Neodymium-Magnets.php activated SrAl_2O_4 light-emitting materials, the emission wavelength of 520nm, as a luminous light-emitting materials prepared fibers are yellow-green color of its light color, change the Eu ~ (~ (2)), Dy ~ (3) dosage does not affect the blue shift or red shift, but doped Nd ~ (3) allows spectral red shift. When H3BO3 dosage of 0.15, Eu ~ (~ (2)) dosage of 0.02, Dy ~ (3) dosage of 0.03 at 1350 ℃ under the conditions obtained after calcined 2h SrAl_2O_4: Eu ~ (~ (2 )), Dy ~ (3) light-emitting materials, Yuhui Liang highest, longest, is the fiber using light-emitting materials, the best choice.