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Osram unveils Oslon black 850nm infrared LED

The compact GaAs (gallium arsenide) based high output device is suited to computer games and optical safety systems in the automotive sector
Osram Opto Semiconductors says its new infrared (IRED) Oslon black SFH 4716S is one of the most powerful IREDs on the market with an optical output of 1030mW.



Oslon black SFH 4716S

Usually, 850nm emitting light sources are lasers rather than IR LEDs (or IREDs). Lasers emit much higher powers than LEDs and can transmit much faster signals. But lasers can also be much more expensive than LEDs.

Both 850nm LEDs and 850nm lasers are made from GaAs and AlGaAs.

Osram's latest Oslon black IRED has a beam angle of 150 degrees, and offers excellent illumination at a range of a few metres. It is therefore ideal for gesture detection systems linked to computer games or for optical safety systems in the automotive sector.

But the infrared diode is capable of even more.

With external optics and tight focusing even distant objects can be well illuminated with infrared light.

The new Oslon black is ideal wherever gesture detection is involved. This high-power IRED illuminates the relevant area so that a camera sensor can detect movement which will then be used to control a computer or enter text.

The wide beam angle of +/-75 degrees ensures that the near-field area is uniformly illuminated and gestures are reliably detected. Text can therefore be entered, for example, even if the hand is a few centimetres away from the keyboard.

The SFH 4716S is also certified in accordance with the Automotive Standard so it can be used in safety-related applications such as driver monitoring or seat occupancy detection systems in vehicles.

Its high optical output of 1030 mW is achieved at an operating current of 1A with an efficiency of around 35 percent. This increased performance is based on stack technology with which Osram provides each chip with two emission centres, thereby doubling its output.

Oslon black achieves a radiant intensity of up to 225 mW/sr. Radiant intensity is measured in mW per steradiant. It indicates the light output within a solid angle segment and therefore defines the intensity of the light beam. The emitted light with a wavelength of 850nm is suitable for camera sensors but is barely visible to the human eye and therefore is not considered annoying.

Perfect for external optics and long ranges

The high optical output of the Oslon black also makes it suitable for combining with external reflectors. It may initially seem contradictory to create a narrow beam from a wide-angle light source but in actual fact this is a very efficient way to achieve high radiant intensity and long ranges.

The light from the SFH 4716S injects very well into an external reflector. The reflector shapes the beam so that it can be tightly focused by an additional lens. This makes it suitable for surveillance systems and monitoring systems that operate with additional infrared illumination.

“With the aid of external reflectors it is possible to produce very narrow beam angles and illuminate at distances of several hundred meters”, says Jörg Heerlein, who is responsible at Osram Opto Semiconductors for product marketing for infrared illumination.

 

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