LED Luminaries

Latest Tech News On LED & OLED Research

Osram starts to bridge green gap

Slightly old story here – but most interesting. High-efficiency green leds have come out of Hi-Q-LED, a German federally*-funded project co-ordinated by Osram Opto Semi. The ‘green gap’ is a spectral region for which it is difficult to make efficient leds (see graph). From Hi-Q…

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IBM builds blue LEDs on graphene

IBM has shown graphene can be used as a non-stick layer between silicon carbide wafers and epitaxial GaN – allowing the expensive SiC wafer to be used multiple times. The graphene layer (which it self is epitaxially grown) stays with the SiC – like teflon on frying pan – so the wafer…

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A bit of light relief

In a searing scientific investigation, Electronics Weekly answers the thorny question: How many lemons does it take to light an LED. &nbsp…

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200 lm/W LED luminaire demonstrated

A 200 lm/W luminaire has been demonstrated, according to Cree. Very little information as been released. What there is, is here. We have asked Cree for more…

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Dev kit for DALI and DMX colour lighting

Gaggione, Cree, and Microchip have teamed up to produce a lighting development kit for digitally-controlled multi-coloured LED lighting. The Lighting Communications Development Platform  combines a PIC microcontroller with a RGBW MC-E LED and a 45mm LLC19N colour-mixing narrow beam focusing optic. Also in there is DALI…

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LED panel enables decoding of invisible images

Soon you could have access to secret information just by waving your hand, writes Sandrine Ceurstemont, editor, New Scientist TV. New digital signage allows you to decode invisible images by quickly moving your fingers in front of the screen. The system, developed by Hirotsugu Yamamoto and colleagues from University of…

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LEDs serve broadband communications

Edinburgh start-up Visible Light Communications (VLC) is focussing on using flickering LEDs instead of WiFi for broadband communications, writes David Manners.   Speeds of up to 500Mbits/sec have been achieved for the technology, called Li-Fi, but the first product from VLC – a consumer transmitter – will deliver data at…

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Ethylhexyl carbazole + rubrene = Liquid OLED

One LED story to note, from our Research.Materials section: Kyushu University reports liquid-OLED Writes our Technology Editor, Steve Bush: Scientists at Kyushu University in Japan have reported liquid-OLED in a recent issue of Applied Physics Letters. In cells sandwiched between sheets of glass – much like an LCD…

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