Improved chip process yields better efficiency for SemiLEDs

January 09, 2013 // By Christoph Hammerschmidt
SemiLEDs has achieved improvements in both epitaxial quality and chip process to its EV- family of LED chips. These improvements allow a 10% increase in blue chip brightness and 8% decrease in forward voltage (Vf) during mass production, enabling its clients to achieve over 130lm/W with cool white and 110lm/W with warm white.

With Enhanced Vertical (EV) technology, SemiLEDs is able to increase brightness and reduce the number of defects with its new advancements in Epitaxial and Process Technology. Production monitoring showed an increase of 10% in the brightness distribution and improved leakage current yield. The EV technology not only increased the luminous output, but it also enabled a down shift of Vf distribution by 8%, increasing the efficiency by 6~8% at a current through the LED of 350mA.

These improvements make SemiLEDs chips suitable for demanding [c1] directional applications such as street lighting, tunnel lighting and indoor retail lighting, the Taiwan-based LED manufacturer pointed out.