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
Volvo shows user interface for self-driving cars
October 05, 2015
Automated driving poses specific requirements to the user interface of the cars, in particular for the transition phases ...
Volkswagen has given engineering a black eye
MEMS platforms are way to go, says Bosch's Finkbeiner
Put FPGAs in your SoCs
Daimler tests self-driving truck on public highway
Silicon Labs prevails in Cresta patent dispute
October 02, 2015
Silicon Labs has announced that the U.S. International Trade Commission (ITC) has found no patent violation by Silicon Labs ...
Machine learning for every app
Heat helps rechargeable batteries extend lifetimes
Cyber threats against cars are here to stay, experts say
- Determine Balancing Current for the LTC3305 Lead-Acid Battery Balancer
- 3 Ways to Simplify Medical Device Testing
- Thread Networking Protocol Simplifies Connecting “Things” in the Home and Beyond
- High Voltage CMOS Amplifier Enables High Impedance Sensing with a Single IC
InterviewMEMS platforms are way to go, says Bosch's Finkbeiner
In the two years since we last interviewed Stefan Finkbeiner, CEO of Bosch Sensortec, the company has taken over from STMicroelectronics as the leading global supplier of MEMS components. Here he explains ...
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, LabNation is giving away three of its SmartScope open source USB oscilloscopes, worth 229 Euros each, for EETimes Europe's readers to win.
Successfully funded through Kickstarter last year, the SmartScope is claimed to be the world's first test equipment designed to run on multiple operating systems and platforms such as smartphones, tablets and PCs. It is powered directly from... 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.