Lumileds phosphor technology expected to simplify binning

Aug. 7, 2007
Lumiramic phosphor technology developed by Philips Lumileds should reduce the number of fine bins offered for each specific CCT for white LEDs.
Philips Lumileds has developed a new phosphor technology, Lumiramic, developed jointly by the company's Advanced Laboratories in San Jose and Philips Research in Europe. Luxeon products that use the new technology are expected in early 2008, and sampling programs will begin with customers in the lighting community in the fourth quarter of 2007.

Lumiramic phosphor technology enables targeted production of white LEDs to specific correlated color temperatures (CCT) on the black-body curve. This will result in high volume availability in the most desired color temperatures.

Lumileds says that by utilizing the new technology it may reduce the number of fine bins at a given CCT by 75% or more. This in turn should greatly simplify the efforts of the lighting community, which has asked the LED industry to reduce the variation in white LEDs and more effectively enable luminaire-to-luminaire consistency.

Lumiramic phosphor technology utilizes a ceramic phosphor plate in combination with the company's new Thin Film Flip Chip (TFFC) technology (see news). The Lumiramic plates are being manufactured at Philips phosphor factory in Maarheeze, The Netherlands.

TFFC technology, recently introduced in Luxeon Rebel, removes the anode and cathode (and associated bond wires) from the light output path and provides an unobstructed top surface on which the Lumiramic plate can be applied (see diagram).

The technology is already being incorporated into the company's LED automotive headlamp products, so that the auto industry's stringent color consistency requirements are met easily and through a completely scalable manufacturing process.

"Philips Lumileds is vertically integrated, meaning we develop, manufacture and use our own chip, phosphor and packaging technologies," said Frank Steranka, Executive Vice President of Research & Development. "Thus our scientists and engineering teams have the unique ability to direct our efforts with the intent that advances in one area are not just supported by other technologies, they are designed to work in conjunction with advances in each of the other technology areas.

"TFFC and Lumiramic are a perfect example of two technology advances that independently provide great value to the market but together, enable an entirely new level of lighting performance. Lumiramic and TFFC were two of the key technologies used to achieve the 115 lm/W performance announced earlier this year [see news] and we continue our work on the remaining technologies that will take our performance to these levels and beyond."