In a groundbreaking development, a research team led by Professor Kang Junyong from the School of Physics and Mechatronics Engineering at Xiamen University has made significant progress in enhancing the performance of deep ultraviolet light-emitting diodes (LEDs). By applying an ultra-thin aluminum film on the surface of high-aluminum nitride LEDs, the team successfully overcame long-standing limitations in optical extraction efficiency. This breakthrough opens up new possibilities for the application of these devices in medical, environmental, and military fields.
The findings were recently published in "Science Reports," an open-access journal under the Nature Publishing Group that covers a wide range of natural science disciplines. The research addresses a critical challenge: the low optical extraction efficiency of deep UV LEDs, which limits their practical use due to significant energy loss during the conversion of electricity into usable light.
Deep ultraviolet light, defined as having a wavelength shorter than 280 nm, plays a crucial role in various applications such as water and air purification, disease treatment, and advanced information technologies. However, due to the inherent properties and manufacturing challenges of high-aluminum nitride materials, the efficiency of extracting deep UV light from LEDs has remained low for years.
After years of dedicated research, Associate Professor Huang Kai and doctoral student Gao Na proposed an innovative solution. They coated the LED surface with a 5-nanometer-thick aluminum film, which surprisingly did not act as a traditional mirror. Instead, it effectively captured and redirected the emitted light sideways, allowing it to pass through the aluminum layer and emerge more efficiently from the front. This method significantly improved the light extraction efficiency, marking a major step forward in the development of deep UV LED technology.
This advancement could lead to more efficient and practical deep UV light sources, paving the way for broader adoption in various industries. The study highlights the importance of material innovation and novel design strategies in overcoming technical barriers in optoelectronics.
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