沙特阿卜杜拉国王科技大学Qiaoqiang Gan团队研究了LED路灯的天空冷却。2025年2月26日，《光：科学与应用》发表了这一成果。

热管理是半导体发光二极管（LED）的一个关键挑战，因为散热不足会降低发光效率并缩短器件的寿命。因此，迫切需要更有效的冷却策略来提高LED的能效。LED路灯主要在夜间运行，芯片温度很高，可以从改进的热管理中受益匪浅。

研究组介绍了一种面向天空的户外LED路灯辐射冷却策略，这是一种创新但探索较少的光电子热管理方法。该方法采用了一种纳米多孔聚乙烯（nanoPE）材料，该材料具有红外透明性和可见光反射率。这种方法能够通过面向天空的辐射冷却通道直接释放LED产生的热量，同时也将大部分光反射回来用于照明。通过将纳米PE作为面向天空的LED灯的覆盖物，该研究在受控的实验室环境中实现了7.8°C的显著降温，在室外环境中则实现了4.4°C的降温。

在这些降温的同时，效率分别提高了约5%和4%。这种提高的效率转化为可观的年度节能，考虑到在美国使用LED路灯，估计为1.9太瓦时。此外，这种电力节约相当于减少了约130万公吨的二氧化碳排放，相当于美国2018年二氧化碳年排放总量的0.03%。

附：英文原文

Title: Sky cooling for LED streetlights

Author: Dang, Saichao, Almahfoudh, Hasan H., Alajlan, Abdulrahman M., Qasem, Hussam, Wang, Jiake, Zhu, Yingkun, Bakr, Osman M., Ooi, Boon S., Gan, Qiaoqiang

Issue&Volume: 2025-02-26

Abstract: Thermal management is a critical challenge for semiconductor light-emitting diodes (LEDs), as inadequate heat dissipation reduces luminous efficiency and shortens the devices’ lifespan. Thus, there is an urgent need for more effective cooling strategies to enhance the energy efficiency of LEDs. LED streetlights, which operate primarily at night and experience high chip temperatures, could benefit greatly from improved thermal management. In this study, we introduce a sky-facing radiative cooling strategy for outdoor LED streetlights, an innovative yet less explored approach for thermal management of optoelectronics. Our method employs a nanoporous polyethylene (nanoPE) material that possesses both infrared transparency and visible reflectivity. This approach enables the direct release of heat generated by the LED through a sky-facing radiative cooling channel, while also reflecting a significant portion of the light back for illumination. By incorporating nanoPE as a cover for sky-facing LED lights, we achieved a remarkable temperature reduction of 7.8°C in controlled laboratory settings and 4.4°C in outdoor environments. These reductions were accompanied by an efficiency improvement of approximately 5% and 4%, respectively. This enhanced efficiency translates into substantial annual energy savings, estimated at 1.9 terawatt-hours when considering the use of LED streetlights in the United States. Furthermore, this electricity saving corresponds to a reduction of approximately 1.3 million metric tons of CO2 emissions, equivalent to 0.03% of the total annual CO2 emissions by the United States in 2018.

DOI: 10.1038/s41377-024-01724-7

Source: https://www.nature.com/articles/s41377-024-01724-7