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Osram integrates thin-film technology in IREDs

Posted: 18 Oct 2004 ?? ?Print Version ?Bookmark and Share

Keywords:osram opto semiconductors? led? infrared emitter diode? ired?

Osram Opto Semiconductors is now using thin-film technology not only for LEDs but also for IR components. Because of the efficiency coming from thin-film, the chip produces an 850nm infrared emitter diode (IRED) that even in its first generation and for a normal chip size achieves an overall output of 50mW for a forward current of 100mA.

The thin-film chips emit virtually all of the light generated internally through its top and has only a thin light-generating layer that is close to the surfacehaving no place for light to escape at the side. This means that the radiated output increases in direct proportion to the size of the chip.

Next month, Osram will be presenting a chip prototype enlarged that produces DC output operation in excess of 400mW at 1A. In radial components, the light can also be tightly focused through a lens, leading to extremely high radiant intensities. For small angles (about 3?), values up to 700mW/sr are possible, even with the small chip.

The wavelength of the new IREDs is 850nm and is closer to visible light (400nm to 780nm) than that of conventional IREDs which emit light with a wavelength of 880nm. These new IREDs are particularly suitable for modern CMOS and CCD cameras because of its sensitivity to the borderline IR range that can detect a wider wavelength spectrum than the human eye. The 850nm IRED is ideal for illuminating scenes that cannot be seen by the human eye but which can be recorded with these cameras. They can be used the automobile sector, for example, for night vision systems which increase road safety at night. This invisible light is also used for safety and security-related monitoring purposes. These include invisible illumination of car interiors for the presence and position-related control of airbags, video-aided monitoring of car parks and the measurement of traffic volume and speed.

The new IREDs are available in various packaging options, but mainly in surface mount packages.

- Rey Buan Jr.

Electronic Engineering Times - Asia

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