Plessey is preparing to produce high-brightness LEDs, which will use a highly regarded technology researched by Cambridge University. Plessey plans to produce a silicon-based GaN LED with a white light efficiency of 150 lm/W by the end of this year, which will rival the performance of traditional sapphire or SiC substrate LEDs.
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Now the stage is uncertain Plessey will launch what kind of products in the highly competitive high-brightness LED market, Plessey believed to have been processed wafers and LED devices are likely to die. It is now certain that Plessey intends to purchase a large number of metal organic chemical vapor deposition (MOCVD) reactors for the mass production of epitaxial wafers in their own plants.
In addition, the competition in the field of silicon-based LEDs will become increasingly fierce. Plessey pointed out that the main advantage of this silicon-based GaN LED technology researched by the University of Cambridge is that it uses a thinner semiconductor layer that can solve the lattice difference between the silicon substrate and the active gallium nitride layer in the chip structure. Match the problem.
OSRAM and Azzurro have solved this lattice mismatch by using relatively thick buffer materials such as multilayer aluminum nitride, and the Cambridge research team is able to use a thinner semiconductor layer to create high quality LEDs. Will reduce the total production cost.
Plessey said Plessey's new GaN-on-si process overcomes this challenge, and its cost-reducing advantages through the use of 6-inch automated processing equipment will ensure Plessey's high-brightness LED lighting products lead the industry.
The industry says that the transfer to silicon substrates is a technological evolution necessary to achieve low-cost, high-volume, high-performance lighting applications. But not everyone agrees with this view. Advances in mass production of sapphire and SiC substrate LEDs have resulted in significant cost reductions, and leading LED manufacturers such as Samsung, Cree, OSRAM Opto Semiconductors and Philips Lumileds are shifting production to 6-inch wafer fabrication.
The cost of LED replacement lamps has also dropped rapidly, which means that Plessey will need to face an equally fast-changing cost target. In addition, the current substrate technology also has room for improvement, which can further reduce costs significantly. 