| Summary: | 碩士 === 中原大學 === 化學工程研究所 === 105 === In recent years, white light-emitting diodes (W-LEDs) has become attractions due to their high brightness, environmentally friendly, long lifetime, well energy efficiency, and less power consumption. Therefore, it is considered as a new next generation light source. However, they fail to achieve higher color rendering because of the lack of red component in blending of different color phosphors. Hence, it is necessary to find red emission phosphors for application.
In this study, we discussed on two kinds of rare earth ions and successfully synthesized the samples via a high temperature solid state reaction at air atmosphere. The rare earth ion as mentioned in this thesis are europium and samarium, which could emit red and orange-red emission light when excited by n-UV chip or blue LED chip. To further discussion, we used a series of analysis such as X-ray diffraction, crystal structure refinement, photoluminescence (PL) spectra, temperature-dependence photoluminescence (TL) spectra, EL spectra, decay lifetime, diffuse reflection spectra, LED fabrication, CIE coordinate and so on to identify the luminescent properties of NaYPO4F:Eu3+, La5BSi2O13:Eu3+, Ca2Y8(SiO4)6O2:Sm3+ and La6Ba4Si6O24F2:Sm3+ phosphors.
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