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Investigation of the Optical Properties of YAG:Ce Phosphor

机译：YAG：Ce荧光粉的光学性质研究

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Recently, many studies have used optical ray-tracing analysis to investigate novel concepts of phosphor-converted white LEDs. Even though optical ray-tracing is a convenient tool, the accuracy of the results depends very much on the optical properties of the various components within the package used in the analysis. Presently, light transmission, reflection, and absorption properties of white LED phosphors are not very well quantified. Therefore, a laboratory study was conducted to quantify at different wavelengths of light the optical properties of a medium that has YAG:Ce phosphor mixed into epoxy. When short-wavelength radiation (blue light) strikes the epoxy-phosphor medium, some portion of the blue light is converted to longer wavelength radiation (yellow light). At a phosphor density suitable for creating a balanced white light, the amount of back-transferred and forward-transferred light, including blue and yellow light, are 53% and 47%, respectively. At a similar phosphor density, when green and red radiant energies strike the epoxy-phosphor medium, most of the energy is not converted by the YAG:Ce phosphor because it is beyond the phosphor's excitation region. In this case, nearly equal amounts of green and red radiant energy are transferred in the backward and forward directions. To demonstrate the usefulness of the results obtained in this study, an optical ray-tracing analysis of a remote phosphor white LED package was conducted. This analysis showed that the surface finish of the reflector cup of a reflective type remote phosphor white LED package does not affect extraction efficiency. However, the extraction depends very much on the effective reflectivity of the inside surfaces of the reflector cup.
机译：最近，许多研究已使用光线追踪分析来研究磷光体转换白光LED的新颖概念。尽管光线跟踪是一种方便的工具，但结果的准确性在很大程度上取决于分析中使用的包装内各个组件的光学特性。目前，白色LED荧光粉的透光，反射和吸收特性尚未很好地量化。因此，进行了一项实验室研究，以量化在YAG：Ce荧光粉混入环氧树脂的介质在不同波长下的光学性能。当短波辐射（蓝光）撞击环氧磷光体介质时，部分蓝光会转换为更长波长的辐射（黄光）。在适合于产生平衡白光的荧光粉密度下，包括蓝光和黄光在内的后向传输光和正向传输光的量分别为53％和47％。在类似的磷光体密度下，当绿色和红色辐射能量撞击环氧磷光体介质时，YAG：Ce磷光体不会转换大部分能量，因为它超出了磷光体的激发区。在这种情况下，几乎相等数量的绿色和红色辐射能沿向后和向前的方向传递。为了证明在这项研究中获得的结果的有用性，对远程磷光体白色LED封装进行了光线追踪分析。该分析表明，反射型远程磷光体白色LED封装的反射杯的表面光洁度不会影响提取效率。然而，提取在很大程度上取决于反射杯的内表面的有效反射率。

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