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  • Infrared Power TOPLED
Nov 2010
OSRAM Opto Semiconductors GmbHRequest Info
SUNNYVALE, Calif., Nov. 19, 2010 — The Stack Power TOPLED SFH4250S from Osram Opto Semiconductors emits almost double the infrared light compared to the standard SFH4250 component. The new IR LED achieves a typical radiant intensity of 22 mW/sr and a total radiant flux of 70 mW in continuous operation at a 70-mA driving current. With its high radiance, the component enables the design of very compact lighting units. In existing designs, the effective range can be increased significantly.

The company’s stack technology for thin-film chips was introduced last year to large-scale 1 mm² chips, featuring a serial connection of two p-n junctions, instead of one, and attaining almost double the performance. The technology has been applied to chips with an edge length of 300 µm for the SFH4250S. The new Stack Power TOPLED allows pulsed operation at up to 1-A pulse current, reaching 220-mW/sr radiant intensity and 700-mW total radiant flux.

Applications where compact lighting units illuminate large areas with infrared light can benefit from this new component. A typical example is 3-D TV sets: The synchronization of shutter glasses with the television picture is achieved by powerful IR emitters that illuminate the area in front of the TV up to a distance of 7 m. The company says that the LED almost halves the number of required IR-LEDs per TV set.

At 850 nm, the emitted light of the SFH4250S is not visible to the naked eye, nor does it interfere with a TV’s remote control, which works at about 950 nm. Many computer games make use of the 3-D technology, too, benefiting from these new IR emitters. This increased IR power also benefits vehicle safety systems, mainly in seat occupancy detection systems for airbag activation and driver monitoring systems to enable fatigue detection (Drowsy Driver System).

The stack technology for thin-film chips has been proved and tested in many applications, from night vision systems in vehicles to sensors in mobile end user devices.

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