News

16 November 2009

 

Osram prototypes LED with warm-white light, high efficiency, and true colors

Osram Opto Semiconductors GmbH of Regensburg, Germany has developed a prototype LED that, it claims, is the first to offer the three key properties that, together, are essential for widespread adoption for general illumination: high luminous efficiency of 104lm/W, a high color rendering index (CRI) of 82, and a warm-white color temperature of 3000K (since warm-white light is targeted specifically at the residential sector).

At 3000K, the LED’s light color is similar to that of a halogen lamp. Its color location is precisely on the Planckian curve, and the light is exactly white, showing no shift to the green spectral region. With an operating current of 350mA and a chip surface of 1mm2, the prototype of the new single-chip LED achieves a brightness of 124lm, corresponding to an efficiency of 104lm/W.

Up to now, efficiencies exceeding 100lm/W have been achieved only in the cold-white spectrum. “The successful combination of high quality of light and excellent energy efficiency will bring the commercial breakthrough for LED technology even closer,” reckons Dr Frank Baumann, project manager for the development of warm-white LEDs.

Osram says that the record results are based on its expertise in providing a new chip architecture in conjunction with improvements in silicon crystal growth technology, improvements in the converter mix, and a high-efficiency package.

Osram aims to gradually integrate the new technologies into production.

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