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The infrared (IR) Platinum Stack Dragon from Osram Opto Semiconductors provides a high optical output from a small surface area.

This creates a high-radiance solution for automotive, industrial and consumer applications where space is limited.

Its 1mm Thinfilm chip-in-stack technology enables it to generate an optical output of nearly 1W from a driving current of 1A, which is almost twice the output of the standard chips that have been used up until now.

The viewing angle and radiant intensity can be varied with standard secondary optics.

Preferred applications are those that require high radiance so that small optics can be used.

Night-vision systems, sensor-based electronic pedestrian protection systems and pre-crash sensors in vehicles can be made much more compact because fewer IR light-emitting diodes (LEDs) are needed to provide the same optical output.

In industrial applications, these high-power IR LEDs can be used in illumination units for CCTV cameras or in systems for automatic number-plate recognition (ANPR).

The increased output of the new IR Platinum Stack Dragon is based on a special Thinfilm chip.

It has two p-n junctions that have been grown or ‘stacked’ one on top of the other.

This stack technology achieves almost twice the optical output power compared to conventional IR Thinfilm chips, according to the company.

The 2.9V forward voltage at 1A enables the use of standard LED drivers that operate in this voltage range.

The IR LED emits at a wavelength of 850nm and is a suitable compromise between maximum spectral sensitivity for CCD and CMOS cameras and suppressed visibility for the human eye.

Another possible application for the IR Platinum Stack Dragon is 3D camera technology, which will be used more and more in consumer devices such as gaming consoles and televisions for gesture recognition.

The high-modulation frequencies of the light source required for these applications (typically 20-50MHz) can be achieved with the new Stack Dragon, according to the company.

Osram Opto Semiconductors

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