| Summary: | 碩士 === 國立臺北科技大學 === 材料科學與工程研究所 === 99 === The research is attempted to synthesize Sr2SiO4:Re(Re=Eu3+、Sm3+) phosphor by using one step fired sol-gel method and Sr2SiO4:Eu2+ by using two step fired sol-gel method. Study several controlling factors that could affect the phosphor’s luminescence characteristics, such as firing temperature, firing time, doped with different amounts of the activator.
Under air atmosphere to synthesize Sr2SiO4:Eu3+ phosphors, we could observe the intensity of emission spectrum would trend to increase when the molar fraction of Eu was enhanced. The excitation spectrum monitored at 618 nm, obtained the strongest excitation peak at 395 nm, and the emission spectrum excited by 395 nm, showed red light wavelength range that were 578 nm、587 nm、589 nm、594 nm、612 nm、618 nm、651 nm、654 nm、686 nm、701 nm, they were correspond to
5D0→7F0、5D0→7F1、5D0→7F2、5D0→7F3、5D0→7F4 transitions, respectively.
Under air atmosphere to synthesize Sr2SiO4:Sm3+ phosphors, the excitation spectrum monitored at 598 nm, obtained the strongest excitation peak at 405 nm, and the emission spectrum excited by 405 nm, showed orange light wavelength range that were 561 nm、569 nm、598 nm、604 nm、607 nm、644 nm、650 nm, they were correspond to 4G5/2→6H5/2、4G5/2→6H7/2、4G5/2→6H9/2 transitions, respectively.
Under reduction atmosphere to synthesize Sr2SiO4:Eu2+ phosphors, the emission spectrum excited by 327 nm, showed blue-green emission peak at 495 nm that due to 4f7(8S7/2)→4f6(7Fj)5d1 transition of nine oxygen coordinated Eu2+ site ; the emission spectrum excited by 385 nm, showed yellow-green emission peak at 554 nm that due to 4f7(8S7/2)→4f6(7Fj)5d1 transition of ten oxygen coordinated Eu2+ site.
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