news digest ♦ LEDs Technology from 2006 to 2009.
Bullington held similar positions at Maxtor Corporation, where he was also a founding member of Maxtor’s Branded Products Group (BPG), an industry pioneer in the external storage solutions market.
Prior to entering the data storage industry, he was a management consultant for A.T. Kearney, where he served a range of clients focused on issues of strategy and operations in the software and technology hardware, aerospace, retail and financial services industries.
He began his professional services career at Deloitte & Touche.
Bullington received his B.A. in Business Administration, with a Certificate of International Studies in Business, from the University of Washington.
Osram introduces LED for
security applications The firm says its infrared Oslon black SFH 4725S is a secret agent in more ways than one
Osram Opto Semiconductors says its latest light has a wavelength of 940 nanometres (nm), making it virtually invisible to the human eye.
But also its black package reflects almost no ambient light whatsoever.
Together with a high optical output of almost one watt, this infrared LED from Osram is suited for covert surveillance.
Record-breaking antireflection coating on
solar cells A new development could significantly improve the performance of solar cells, LEDs and photodetectors
The Oslon black SFH 4725
Concealed security systems – such as those installed in banks, on machinery and at border controls – need to be designed so they are unobtrusive.
This is a major challenge for infrared illumination in such applications because the 850 nm LEDs that are most often used here appear as weak dots of red light especially in dark environments.
The solution is to switch to a wavelength of 940 nm, which the human eye is 130 times less likely to notice. Camera sensors however can easily detect this invisible radiation.
The Oslon black SFH 4725S is suited to components for such 86
www.compoundsemiconductor.net March 2013
A team of researchers from Rensselaer Polytechnic Institute (RPI), Magnolia Solar, Inc. and Pohang University of Science and Technology have demonstrated a novel antireflection (AR) coating.
It beats the widely employed double-layer AR (DLAR) coating on state-of-the-art triple-junction solar cells.
The scientists demonstrated that the solar cells investigated gain over 4 percent in efficiency when replacing the industry- standard DLAR with an optimised four-layer AR coating.
applications. This compact infrared LED provides 940 nm light with the high optical output of 980 milliwatts from an operating current of 1 amp.
Behind this, high performance lies the Nanostack technology in which Osram has succeeded in providing two emission centres in one chip, almost doubling the light output. The SFH 4725S achieves a radiant intensity of 450 mW/sr at an emission angle of 90 degrees and therefore provides excellent illumination over the area being monitored.
Radiant intensity (measured in milliwatts per steradiant) indicates the light output within a solid angle segment and therefore defines the intensity of the light beam.
The black package ensures that the component is completely concealed behind the camera lens. “The 940 nm SFH 4725S is a further addition to our Oslon black series for the security sector, which already includes 850 nm versions with standard and Nanostack chips,” says Jörg Heerlein, Head of Product
Osrsam says the compact Oslon is currently one of the most powerful versions for both visible and infrared illumination.
Measuring 3.85 x 3.85 x 2.29 mm, the infrared Oslon components are among the smallest IREDs with around 1 W optical power. I also has a beam angle of +/-45°.
“Users with experience in constructing visible lighting units can transfer their know-how and their processes directly to the infrared Oslon,” adds Heerlein.
The market is also full of lenses that designers can use to shape the beam from the IRED to meet their specific requirements.
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