Print  |  Send  |   

Infrared LED prototype sets efficiency record

December 05, 2012 // Christoph Hammerschmidt

Infrared LED prototype sets efficiency record

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

Safety & Security,Infotainment,Body Electronics,Power Management,Power Management,Optoelectronics,LEDs

Follow us

Fast, Accurate & Relevant for Design Engineers only!

Technical papers     

Linear video channel


Read more

This month Ambiq Micro is giving away five of its 'Apollo EVB' evaluation boards, worth 9 each for EETimes Europe’s readers to assess the capabilities of their cutting-edge Apollo sub-threshold microcontroller.

The new suite of Apollo MCUs is based on the 32-bit ARM Cortex-M4 floating point microcontroller and redefines 'low power' with energy consumption that is typically five to...


Design centers     

Infotainment Making HDTV in the car reliable and secure

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.


You must be logged in to view this page

Login here :