| Summary: | 碩士 === 明新科技大學 === 化學工程與材料科技系碩士班 === 107 === In this experiment, the preparation and characteristics of phthalate inorganic fluorescein were investigated. The sol-gel method was used to make Na2SiO3 as the cerium source, and three different rare earth elements were doped as activators: Tb3+, Eu3+, Ce3+, in sol- Two different acids were used in the gel process. The pH was adjusted by nitric acid and sulfuric acid and sintered at 900 ° C, 1100 ° C, and 1200 ° C at a heating rate of 10 ° C /min. The sintering was continued for 4 hours. The effects of temperature on the crystal structure and luminescence properties of different sintering temperatures were investigated under different pH values. The different characteristics of the doping ratio at various temperatures were studied by changing the rare earth elements doped with different proportions. Finally, the radiation spectrum obtained by photoluminescence (PL) was used to obtain the conditions of relatively optimal radiation.
Compared with the optimal excitation wavelength (nm), the optimal excitation wavelength of SrSO4 is between 240nm and 320nm, and the optimal excitation wavelength of SrSiO3 is between 350nm and 485nm. The range of ultraviolet light and blue light. The results of this experiment are the same as expected. SrSiO3 has an excitation band that can reach blue light, and also combines different rare-earth elements to synthesize blue, green, and orange phosphor powder. The use of blue LED chips with current white LED technology with blue, green and red fluorescent powder is currently the most developed technology because of its low cost and high color rendering, that is, without patents. SrSiO3 can produce fluorescent powders that meet the needs, plus thermal stability and high efficiency. SrSiO3 is expected to be the main force for future development.
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