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
IoT Security Foundation formed
September 04, 2015
The Internet of Things Security Foundation has been formed with a large list of associate members having sprung out of discussions ...
Self-sweeping lasers could make LIDAR systems cheaper
DecaWave preps for expansion, next location chip.
These five trends drive automotive innovation
How to increase your engineering value in just 20 minutes a day
Google-led group preempts HEVC
September 03, 2015
Internet giants Google and Cisco have banded together with Amazon and Netflix, two large streaming service players, along ...
IT security is changing: if the SIEM is dead, what's next?
Serdes startup Credo raises $8 million
The future of print and paper: digital hybrids
- High Voltage CMOS Amplifier Enables High Impedance Sensing with a Single IC
- Software-Defined Radio Handbook
- Why Making the Move from a Variable Transformer to a VariPLUS is the Right Decision
- Automating Leakage and Functional Testing
InterviewCEO interview: Ambiq sees broader options for low voltage
Mike Noonen, recently appointed interim CEO at microcontroller startup Ambiq Micro, discusses the focus and opportunities for this pioneering company designing circuits that can operate below the threshold ...
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, Altera is giving away three of its second-generation Nios II Embedded Evaluation Kit (NEEK), worth 9 each, for EETimes Europe's readers to win.
The feature-rich platform provides a fast and simple way for embedded designers to experience the capabilities of a custom embedded processor in a non-volatile FPGA.
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.