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Study on red fluorescent ceramics for white light illumination

Study on red fluorescent ceramics for white light illumination

  • 2020-10-30
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Study on red fluorescent ceramics for white light illumination

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  • Categories:NEWS
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  • 2020-10-30
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As the most commonly used wavelength conversion material in white LED, Ce:YAG yellow phosphor can efficiently convert the blue light emitted by InGaN chip into yellow light, thus mixing white light for lighting. However, with the continuous improvement of lighting quality requirements in modern life, the biggest problem of Ce:YAG lies in its short peak wavelength of yellow light and lack of red component in mixed white light, so its color rendering index is low. At the same time, under the development trend of high-power and high-brightness lighting, the white LED with organic silica gel encapsulated phosphors is faced with such problems as low thermal conductivity, easy aging and color point migration. Therefore, the development of all inorganic encapsulated red fluorescent materials has been the focus of academic circles and industry in recent years.

In this study, the research team prepared ZrO2 as the second phase of Ce:YAG ceramics for the first time, and found that the emission wavelength of Ce3+ significantly redshifts from 540nm to 570~610nm with the introduction of ZrO2. Is different from common big (compared with Y3 +) doped with rare earth ions and M2 + N4 interchange + (such as magnesium 2 + - Si4 +) ions doped replacement and make the Ce3 + launch redshift, ZrO2 - Ce: YAG launch redshift is attributed to the Zr4 + under the environment of high temperature vacuum back into Zr3 + occupy Y3 + a form in the lattice oxygen vacancy defects, so that the Ce3 + ion electrons in the 5 d - oxygen vacancy level of radiative transition, leading to the final emission wavelength redshift. This finding provides a new idea for the study of all-inorganic red fluorescent materials based on Ce:YAG system.

 

 

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