Nanomaterial Innovation Could Reduce LED Streetlight Carbon Emissions by Over 1 Million Tons

A study led by King Abdullah University of Science and Technology (KAUST) in Saudi Arabia has demonstrated that nanomaterials can significantly reduce the carbon footprint of LED streetlights. Researchers estimate that deploying this technology across the United States could cut carbon dioxide emissions by more than 1 million tons.

At the core of this breakthrough is a nanomaterial called nanoPE, which enhances the thermal radiation properties of LED surfaces, effectively lowering their operating temperature. LEDs generate substantial heat when emitting light, and excessive temperatures can degrade internal components and shorten their lifespan. In fact, approximately 75% of the energy consumed by LEDs is lost as heat. By reducing heat buildup, nanoPE not only enhances LED performance and longevity but also significantly decreases energy-related emissions.

Traditional LED streetlights direct light downward while trapping heat inside the fixture. However, streetlights coated with nanoPE are designed to be inverted, facing the sky. NanoPE allows infrared radiation (the primary source of heat) to pass through while reflecting visible light back toward the ground. Research findings indicate that over 80% of infrared radiation escapes into the sky, while more than 95% of visible light is redirected downward, ensuring optimal illumination without compromising brightness.

NanoPE is derived from polyethylene, one of the world’s most widely produced plastics. Scientists achieved selective control over visible and infrared light by creating microscopic pores—just 30 nanometers in diameter—within the plastic and stretching it into ultra-thin sheets. This innovation provides a promising solution for sustainable lighting worldwide, particularly in high-temperature regions, where enhanced LED cooling efficiency is crucial while maintaining high illumination performance.