Infrared LED prototype sets efficiency record
December 05, 2012 // Christoph Hammerschmidt
Osram claims a new efficiency record for an infrared LED chip: In the lab, the prototype achieved an efficiency of up to 72 percent. With a wavelength of 850 nanometers the chip has been designed in particular for infrared illumination applications.
At 930 milliwatts from an operating current of 1 A, its light output under laboratory conditions is 25 percent higher than that of the chips currently available on the market, lighting systems vendor Osram claims. The efficiency was measured at room temperature and at a dc current up to 1 A.
The results from Osram's R&D laboratory in Regensburg have created a new milestone. The prototype of a 1 mm2 chip in infrared thin-film chip technology has achieved an efficiency of 72 percent from an operating current of 100 mA. This efficiency, known as wall plug efficiency (WPE), indicates the ratio of radiated power to electrical input power.
Figure 1: Efficiency versus current of Osram's IR LED prototype.
The external quantum efficiency (EQE), in other words the probability of creating a photon and its emission from the LED chip per electron, is as high as 67 percent and remains above 64 percent up to an operating current of 1 A.
The wavelength of the chip prototype of 850 nanometers is required for infrared illumination applications, particularly for surveillance tasks and use with CCTV cameras. Osram also sees potential safety applications in the automotive sector, such as precrash sensors and illumination sources for night vision systems.
The method to increase the efficiency and brightness at the infrared LED prototype can be applied to other wavelengths as well, Osram said. This creates the perspective of implementing energy-efficient IR lighting solutions with fewer components in multi-chip applications. Under the bottom line, this would result in cheaper solutions which at the same time consume less energy.
The IR chip is expected to go into series production between in the first half of 2013, the company announced.All news
Big data sets drones to fly
March 27, 2015
For the last seven years, visiting professor at the University of Maryland Institute for Advanced Computer Studies Dr. Tom ...
CE marking misconceptions
Fraunhofer launches test centre for high-voltage batteries
Auto chip market: upheaval ahead
USD 10,000 worth of components offered in Digi-Key/Silicon Labs IoT contest
Richard Feynman and homomorphic filtering
March 26, 2015
Dennis Feucht discusses his role in preserving the sound of the bongo-playing physicist's voice in audio files that are available ...
Giant spider-bot needs your inspiration
Smart cities will see it all
ST drops in 2014 MEMS ranking, says IHS
- Intelligent Over Temperature Protection for LED Lighting Applications
- Intel helps to Turbocharge Infotainment Systems Designs
- High Performance Portable DC Bench Power Supply: Save Money and Free Up Bench Real Estate by Building Your Own
- Software-Defined Radio Handbook
InterviewInfineon: CAN FD success goes at the expense of FlexRay
The faster version of the venerable CAN bus, CAN FD is currently taking off at several carmakers. Infineon's Thomas Böhm, Head of Body / Automotive, believes this could well go at the expense of FlexRay. ...
Filter WizardCheck out the Filter Wizard Series of articles by Filter Guru Kendall Castor-Perry which provide invaluable practical Analog Design guidelines.
Linear video channel
READER OFFERRead more
This month, Freescale is giving away 5 RIoTboards, worth 74 dollars each, for EETimes Europe's readers to win.
Designed to run Android operating systems efficiently or to run under Linux, the board is based on the Freescale i.MX 6Solo processor; using the ARM Cortex-A9 architecture.
The RIoTboard platform also includes a rich set of peripherals including a 10M/100M/Gb Ethernet port, 1...MORE INFO AND LAST MONTH' WINNERS...
December 15, 2011 | Texas instruments | 222901974
Unique Ser/Des technology supports encrypted video and audio content with full duplex bi-directional control channel over a single wire interface.