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Technical Insight

Uniroyal subsidiary NorLux samples first LED lighting products (LED News)

NorLux has developed its first product - a new high-power LED package containing multiple LEDs. NorLux was recently formed by Uniroyal Technology to specialize in the design of custom lighting solutions based on high-brightness LEDs (Compound Semiconductor May 2001, p7). The new LED package is known as the "Hex" due to the hexagonal shape of its aluminum substrate board (see ). The hexagonal configuration allows efficient and flexible packing with other Hex substrates. Each hexagon contains a central emitter region about 0.375 inches in diameter containing as many as 40 LEDs. The aluminum is used for thermal dissipation but not electrical conductivity, and the chips are wire bonded and connected to two top contacts on the substrate to facilitate the anode and cathode. Differing numbers of Uniroyal s InGaN or AlInGaP high-brightness chips can be arranged on the substrate depending on the type of light output required. The light output can be monochrome, full-color (using RGB), or white (using RGB or binary complementary blue and yellow LEDs). The chips and bonds are encapsulated in a high optical index material for light extraction and protection of the die and wire bonds. NorLux s Hex substrate packages have a final diameter of 1.25 inches, and can be packed densely to achieve high levels of brightness. The substrate affords a thermal resistance of less than 10C/W compared to around 350C/W for a standard 5 mm LED lamp. This allows the LEDs to be driven at higher power levels. Preliminary data sheets for a Hex substrate board containing 40 red AlInGaP/ GaAs devices testify to a luminous efficiency of 20 lm/W for a forward current of 0.45 A. A 470 nm blue Hex offers 4 lm/W, while the company s 525 nm green offers 9.5 lm/W. "The hexagons are packed very densely," says NorLux s general manager Andy Lipman. "The die are also concentrated in a very small area, which makes them an ideal source for optical coupling. The package is designed to have primary optics attached to increase the light output." NorLux is currently sampling the Hex and says the new devices target industrial applications such as machine vision, in addition to signage, architectural illumination, and decorative and retail lighting solutions. Uniroyal gets more light In more news, Uniroyal Optoelectronics (UOE) has achieved new levels of brightness from its high-brightness red LEDs manufactured at its facility in Tampa, Florida. UOE is producing 618 nm and red (626 nm) absorbing substrate AlInGaP/ GaAs LEDs that contain an integrated Bragg reflector and exhibit a brightness output ranging from 140 to 200 mcd in die form.
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