20 December 2011

Epistar reports record 216lm/W warm-white LED with high-voltage chipset

Taiwan’s largest LED chipmaker Epistar Corp of Hsinchu, Taiwan has reported what it claims is record luminous efficacy for a warm-white LED with a high-voltage chipset. Efficacy is 216lm/W at an operating current of 5mA and a color rendering index (CRI) of 87 Ra at a color correlated temperature (CCT) of 2700K. Operating under a typical driving current of 15mA (or about 1W equivalent), luminous efficacy was 197 lm/W.

Figure1: Luminous efficacy of high-voltage warm-white LED versus drive current.

Figure1: Inset.

Epistar says that its latest record adopts several technologies in high-voltage chips. These include a novel substrate transfer process, lower MQW (multi-quantum well) light absorption, a fine structure for increasing photon extraction efficiency, improvements in current spreading uniformity, and an improved MQW structure with high internal quantum efficiency (IQE) and lower forward voltage.

Epistar says that the higher-performance warm-white HV chipset is suitable for retrofit, professional lighting, and luminaires applications.

The firm adds that it will continue to develop more advanced technologies to enhance product performance, as well as working closely with downstream customers to provide better LED lighting solutions to the market.

Tags: Epistar Warm-white LEDs

Visit: www.epistar.com.tw