Plessey is claiming narrow light emission angles direct from lighting LEDs using what it is calling ‘chip-scale optics’.
According to the company, schemes to collimate monochromatic light at the LED level have been developed before but no-one has previously collimated white light at the LED level.
“The technology was originally designed as an on-chip phosphor dam,” said Plessey‘s CTO Dr Keith Strickland. “We realised that the original growth silicon, normally sacrificed during LED production, could be shaped and used to form mechanically robust MEMS-type features on the emitting surface of a vertical LED.”
The degree of collimation is controlled in part by the mechanical dimensions of these on chip structures.
Light shutters waste optical power, which according to Plessey optical designer Dr Samir Mezouari is not necessarily an issue.
“High-end lighting designers do not count lumens per Watt as the primary figure of merit for LEDs,” he said. “A lighting designer aims to illuminate a particular surface area. Chip-scale optics can simplify luminaire designs by forming symmetrically collimated beams with narrow angles or asymmetric beams to form elongated far field light profiles.”
Initial intended applications are: retail spot lighting, hospitality lighting, high bays, low bays, street lighting and stadium lighting.
Plessey will be exhibiting the technology at LuxLive in November. Samples are scheduled for Q1 2016.
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