San Jose-based LED maker Lumileds introduced a family of high power infrared (IR) emitters. The company designed the IR emitters to address the broad range of rapidly growing IR applications. Applications for the IR LEDs include facial recognition/iris and gesture scanning, machine vision, wearable health monitors, night vision cameras, and other biotech and industrial applications. The new IR Family boasts a combination of high radiant intensity with the lowest thermal resistance, enabling compact system designs.
The IR emitters come in wavelengths above the visible spectrum at 850 and 940 nm. Each of these wavelengths has advantages depending on the application. Lumileds notes that the 850 nm most cameras (including CCTV) use 850nm emitters. However, 850 nm emitters are susceptible to interference from sunlight and the reddish glow the interference causes.
To combat these problems, the new IR Family also includes a 940 nm wavelength emitter. This wavelength is almost invisible and is less sensitive to sunlight interference, making it perfect for ambient light and “stealth mode” systems.
High-Power Luxeon IR Family Built on Compact Line and Domed Line
Lumileds built the new IR Family on two platforms. The Luxeon IR Domed Line uses various beam angles and can achieve a radiant power of up to 1,400 mW at 940 nm for long range applications. The other platform, the Luxeon IR Compact Line, offers IR transmission with very high radiant power density up to 1,150 mW at 940 nm.
“The Luxeon IR Compact Line addresses markets that require high power density in a small footprint,” said Thierry De Smet, director of product management at Lumileds. According to Lumileds, the Luxeon IR Compact Line measures 1.37 x 1.90 mm and provides a radiant power density of up to 400 mW/mm2.
The Luxeon IR Domed Line comes in 850 nm and 940 nm versions with beam angles of 60°, 90° and 150°. The domed line comes in an industry standard 3.7 mm x 3.7 mm package.
The Domed Line’s design allows drop-in upgrades for applications that need high punch, long range and high uniformity such as industrial automation, positioning, depth measurement, and biometric identification. With the lowest thermal resistance of just 2.5 K/W, Lumileds says that the package efficiently disperses heat from the emitter for improved system performance and reliability. The Luxeon IR Dome line’s standard footprint makes it compatible with many off-the-shelf lenses.
According to the IEC Photobiological Test (IEC/EN 62471 standard), the Luxeon IR Family is rated as Risk-Free for eye safety. In initial L70 reliability testing, the Luxeon IR Family has a projected lumen maintenance of over 30,000 hours.
More information about the Luxeon IR can be found at www.lumileds.com/LUXEONIR.