09 Aug 2002
Researchers from Kopin and North Carolina State University make blue LEDs with a low operating voltage.
US-based semiconductor device manufacturer Kopin is making efficient GaN-based blue LEDs with a lower operating voltage than currently-available devices.
The move is a departure for Kopin, which manufactures display products and HBT epiwafers. The company has applied for a patent and is now sampling the devices, known as CyberLites, to prospective customers.
The drive voltage of the LEDs is 2.9 V at 20 mA, compared with the conventional operating voltage of 3.3-3.5 V. Luminous intensity is rated at 100 mcd.
Although device wavelength is not specified, the new LEDs demonstrated a radiant power of 10 mW at 20 mA (unpackaged), which is comparable to commercially available high brightness blue devices.
"Getting below 3.0 V has been a scientific hurdle for nearly a decade," said Kopin founder and chairman John Fan. "We believe we can move CyberLites into large-volume production for the mass market. We have already begun shipping evaluation samples of CyberLites to prospective customers towards this goal."
The new LEDs are described in the July 29 edition of Applied Physics Letters. Researchers from Kopin and North Carolina State University made devices producing up to 10 mW of optical power.
Richard Dixon is news editor of Compound Semiconductor magazine.