| Summary: | 碩士 === 國立交通大學 === 應用化學系分子科學碩博士班 === 100 === Fluorosulfide and oxyfluorosulfide-based phosphors have relatively low synthetic temperature and appropriate excitation wavelengths for applications in fabricating white-light LEDs. To enhance the thermal stability of sulfides, we choose the fluorosulfides and oxyfluorosulfide as host matrices and activated with Ce3+ and Eu2+ as activator, respectively. In this study, we have prepared five series of fluorosulfide and oxyfluorosulfide phosphors, viz., Y3S2OF3:Ce3+, La2MF4S2:Ce3+ and La2MF4S2:Eu2+(M = Ca, Sr) using sealed quartz tube at 850-1000℃and 1150℃, respectively. These phosphors can be excited by radiation with wavelength ranging from 300 nm to 500 nm and their emission colors almost cover the whole visible spectral range.
The content of this thesis can be divided into two parts. Firstly, we will introduce the background knowledge of phosphors used in LEDs, and then elaborate the design rules, the motivations and goals of the study. The synthetic methods and further characterization results will be discussed in the second part.
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