Title page for etd-0627115-163556


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URN etd-0627115-163556
Author Yi-Yin Kuo
Author's Email Address No Public.
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Department Electro-Optical Engineering
Year 2014
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title The Study and Design of Antireflection Coating on Glass Phosphor
Date of Defense 2015-07-15
Page Count 55
Keyword
  • glass phosphor
  • antireflective coating
  • color wheel in projector
  • MgF2
  • Abstract In this study, glass phosphors for color wheels in laser projector are developed by sintering the mixture of phosphor crystals and optical glass. The optical performance of glass phosphors in different thickness and doping concentrations is discussed. The results showed that the yellow glass phosphor with thickness of 0.25mm and doping concentration of 40wt% had maximum brightness of 169.7 lm and color purity of 95%; green glass phosphor with thickness of 0.35mm and doping concentration of 35wt% had maximum brightness of 185 lm and color purity of 77.7%. Glass phosphors can be better alternatives of silicon phosphors as the color wheel of laser projector because all the optical performance of the glass phosphors were as good as silicon phosphors and the glass phosphors had better thermal stability than silicon phosphors.
    We also coated MgF2 on the glass phosphors as the antireflective layer to increase the amount of excitation light. The results showed that both the fluorescence intensity and brightness of glass phosphor had an improvement with MgF2 antireflective coating. The surface reflectivity of glass phosphor in the absorption bands of the phosphor (400~450nm)was successfully suppressed from 3.8% to 1.0% after the deposition of MgF2. The brightness and the fluorescent brightness of glass phosphor were increased of 3 lm. The intensity of residue blue light decreased 14%. The intensity of the light emitted from yellow phosphor powder (@551nm) increased 3.37% and the total fluorescence intensity increased 2.5%.
    Advisory Committee
  • Kuang, Jao-Hwa - chair
  • Wood-Hi Cheng - co-chair
  • Li-Yin Chen - advisor
  • Files
  • etd-0627115-163556.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2015-07-27

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