GaN-on-Silicon LED die pump phosphor to a white colour range

6th August 2015
Nat Bowers

Manufactured on the company's patented GaN-on-Silicon technology, Plessey has announced the release of its range of MaGIC LED die. The blue die, or blue pump for their ability to pump phosphor to a white colour range, are the latest innovation in high brightness LED die designed for medium to high power applications including general lighting, signage, commercial, residential and street lighting.

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.

Dr. Keith Strickland, CTO, Plessey, commented: "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."

Plessey offers its range of blue die in various wavelength options. Capable of generating over 60% light output efficiency, or wall plug efficiency, the die are supplied to a standard thickness of 150μm (other thicknesses can be supplied, down to a minimum of 75μm).

"We are seeing a definite move away from discrete PLCC designs, especially in the higher power applications. By having our own growth and semiconductor processing facility in Plymouth, Plessey provides the flexibility and speed of response required for a vast range of high-end applications that can use the thermal and light output from our silicon LED die," added Giuliano Cassataro, Vice President, Global Sales, Plessey.

The die are supplied on a blue tape in single intensity and colour bins to provide close uniformity, and are intended to be used with standard pick and place machines.

Samples are available in a variety of die pack formats with blue die wavelengths ranging from 420 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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