Handheld DUV LED source is 4% efficient

Nov. 5, 2012
A group of Japanese scientists has created a DUV LED that contains both AlGaN quantum wells and graphene nanoneedle field electron emitters; the combination results in a 20 mW output and a 4% power efficiency.
Deep-ultraviolet (DUV) light is used for sterilization, assisting chemical reactions, and photolithography. The disadvantages of conventional DUV sources such as excimer lasers and mercury-vapor lamps—expense and inclusion of toxic substances—are driving researchers to create more efficient DUV LEDs. Aluminum gallium nitride (Al-GaN) shows promise as an active material for DUV LEDs, but the efficiency of AlGaN LEDs emitting at wavelengths below 300 nm has remained low. A group of scientists from Stanley Electric Corporation and the National Institute of Advanced Industrial Science and Technology, Osaka University, Shizuoka University, and Nagoya University (all in Japan) has created a DUV LED that contains both AlGaN quantum wells and graphene nanoneedle field electron emitters; the combination results in a 20 mW output and a 4% power efficiency. The handheld emitter is driven by ordinary AA batteries. The graphene needles have tip radii <5 nm, boosting their electron-emitting efficiency, and operate in a small evacuated glass tube capped by the quantum well on a substrate. Electron-emitter lifetime testing shows >10,000 hours so far. Improving the light-extraction efficiency could boost power efficiency from 4% to 25%, say the researchers. Contact Takahiro Matsumoto at[email protected].

Sponsored Recommendations

March 31, 2025
Enhance your remote sensing capabilities with Chroma's precision-engineered optical filters, designed for applications such as environmental monitoring, geospatial mapping, and...
March 31, 2025
Designed for compatibility with a wide range of systems, Chroma's UV filters are engineered to feature high transmission, superior out-of-band blocking, steep edge transitions...
March 31, 2025
Discover strategies to balance component performance and system design, reducing development time and costs while maximizing efficiency.
March 31, 2025
Explore the essential role of optical filters in enhancing Raman spectroscopy measurements including the various filter types and their applications in improving signal-to-noise...

Voice your opinion!

To join the conversation, and become an exclusive member of Laser Focus World, create an account today!