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首页> 外文期刊>International Journal of Heat and Mass Transfer >Analysis of a remote phosphor layer heat sink to reduce phosphor operating temperature
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Analysis of a remote phosphor layer heat sink to reduce phosphor operating temperature

机译：分析远程荧光粉层散热器以降低荧光粉工作温度

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摘要

The remote phosphor method has provided significant improvement in overall LED lighting system efficiency by reducing the number of photons absorbed at the LED chip. However, increased demand for higher light output from smaller light engines has resulted in high radiant energy and heat densities on the phosphor layer. The problem is exacerbated by the phosphor conversion efficiency decreasing with increased operating temperature in the remote phosphor layer. A higher operating temperature can negatively affect performance in terms of luminous efficacy, color shift, and life. In cases such as this, the system's performance can be improved through suitable thermal management that reduces the phosphor layer temperature. In this study, we present the first investigation to experimentally quantify the operating temperature and optical performance effects of using a dedicated phosphor layer heat sink solution as a thermal management strategy to reduce phosphor layer operating temperature. The effects of heat sink geometry and material parameters on phosphor layer operating temperature and optical performance were investigated. The experimental results showed a decrease in phosphor layer operating temperature with an increase in phosphor layer heat sink interface area, while the total radiant power decreased. Ray-tracing simulations identified the low surface reflectance of the heat sink interface area as the cause of this decrease in radiant power. A finite element model was developed from the experimental results to understand the decrease in phosphor layer operating temperature with increased heat sink interface area. This simulation work was used in identifying the causes affecting observed optical and thermal performance in the short-term experiments. The study also investigated the long-term performance of phosphor layer heat sinks and the findings are reported.
机译：远程磷光体方法通过减少LED芯片吸收的光子数量，大大提高了整个LED照明系统的效率。然而，对来自较小的光引擎的更高的光输出的需求的增加导致了磷光体层上的高辐射能和热密度。随着磷光体转换效率随着远程磷光体层中工作温度的升高而降低，该问题更加严重。较高的工作温度会对发光效率，色偏和寿命产生负面影响。在这种情况下，可以通过适当的热管理降低荧光粉层的温度来改善系统性能。在这项研究中，我们提出了第一个实验，以实验方式量化使用专用磷光体层散热器解决方案作为降低磷光体层工作温度的热管理策略的工作温度和光学性能的影响。研究了散热器的几何形状和材料参数对荧光粉层工作温度和光学性能的影响。实验结果表明，随着荧光粉层散热器界面面积的增加，荧光粉层的工作温度降低，而总辐射功率降低。射线追踪模拟确定散热器界面区域的低表面反射率是造成辐射功率下降的原因。根据实验结果建立了有限元模型，以了解随着散热片界面面积的增加，荧光粉层工作温度的降低。该仿真工作用于确定短期实验中影响观察到的光学和热性能的原因。该研究还调查了荧光粉层散热器的长期性能，并报告了研究结果。

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