MaGICal 60 Per Cent WPE Generated In Medium To High Power LED Applications


Plessey recently unveiled its latest high brightness LED die that is capable of generating over 60 per cent wall plug efficiency (WPE) in wide range of medium to high power applications including general lighting, signage, commercial, residential and street lighting. The WPE is the energy conversion efficiency with which the system converts electrical power into optical power. It is defined as the ratio of the radiant flux (i.e., the total optical output power) to the input electrical power.

As the release states, Plessey’s range of MaGIC LED die is manufactured on the company’s patented GaN-on-Silicon technology. The die is also referred to as blue pump for their ability to pump phosphor to a white colour range.

According to the press release, “The MaGIC LED die is supplied to a standard thickness of 150µm, whilst other thicknesses can be supplied, down to a minimum of 75µm. The die is supplied on a blue tape in single intensity and colour bins to provide close uniformity, and is intended to be used with standard pick and- place machines.” Adding further, the release mentions that the manufacturing process produces a vertical LED structure which has the anode as bottom contact, and the cathode formed in the top metal layer. The layout of the top metal layer is optimised for a particular LED size and die operating current, and includes one or more bond pads for connecting to the cathode.

Further in an interview, Plessey CTO, Dr. Keith Strickland, said, “We have developed a wide range of LED die for a number of applications and our GaN-on-Silicon technology works particularly well in higher power applications such as high bay, street lights, projector lamps, spot lamps and floodlighting. This current process technology will become the base for our application specific LEDs, the ASLED, which bridges the gap between LED component suppliers, solid state lighting fixture designers and the OEMs.”

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According to the company, samples are available across the globe in a variety of die pack formats with blue die wavelengths ranging from 420nm to 480nm and from mW to 10W with the PExS4500 range having a typical optical output power of 4000mW from a 3A drive current.


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