Products, Materials + Tools | Aug 31, 2010

EPISTAR Achieves 135lm/W White LED at 1W Operation

EPISTAR announces it has developed a High-Voltage (HV) LED chip that enables 135 lm/W white LED at 1W operation and has begun shipping its high-voltage (HV) chips to General Electric (GE), Philips, Osram and IKEA.

EPISTAR has developed a technology suitable for lighting applications to reach high efficacy using a single large chip size (45mil) blue LED chip eliminating the need for complicated packaging of many small-sized chips and their wires. This technology enables a white LED with efficacy up to 135 lm/W at color temperature of 5000 K. To reach such high efficacy with a simplified package desired in lighting applications, EPISTAR developed a High-Voltage monolithically integrated DC multiple-chip array to significantly improve current spreading. Consequently, much lower forward voltage and higher Wall Plug Efficiency (WPE) are achieved at 5.5W operation as compared to normal power chip. Packages of HV LED chips can be used in general lighting and any applications for high-efficacy white light.

HV LED shares much common process technology with AC LED, bearing several high-voltage micro dies on it as AC LED. The only exception is that it does not have a bridge circuit, which strings all these micro devices to add up their voltages to fit household 110-220 V AC power outlet. But users can turn a direct current (DC) HV LED into an AC LED by adding an external bridge to HV LED package.

HV chip is reportedly less expensive than alternating-current (AC) chip in high-power applications, so Epistar is estimated to increase the shipment of HV LED chips next year.

Epistar, Formosa Epitaxy Inc. and Philips Lumiled Lighting Co. have ventured into the HV LED sector.

About Epistar Corporation:
At Epistar, we strive to be much more than a premier LED chip provider. While we are helping leading global brands actualize LED's potential, our focus remains simple and partner-oriented. Epistar's own unique “Co-Activation Service Model” allows us to work alongside our partners, so that together, we are able to satisfy every partner’s clients. And with 15 years of accumulated experience and unmatched expertise, Epistar is truly equipped to help you illuminate the world in a better light. For further information, please visit: