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Optoelectronics/Displays  

Osram lab sets new record for white LEDs

Posted: 25 Jul 2008     Print Version  Bookmark and Share

Keywords:brightness  efficacy  white LEDs  prototype LEDs 

Osram Opto Semiconductors development engineers have achieved new records for the brightness and efficiency of white LEDs in the laboratory. Under standard conditions with an operating current of 350mA, brightness peaked at 155 lumens and efficacy at 136 lumens/W. White prototype LEDs with 1mm² chips were used. The light produced had a colour temperature of 5,000 K, with colour coordinates at 0.349/0.393 (cx/cy). Potential applications include general illumination, the automotive sector and any applications that call for large high-power LEDs.

Key to the success was the efficient interplay between all the advances made in materials and technologies. A perfectly matched system of optimised chip technology, a highly advanced and extremely efficient light converter and a special high-performance package combined to produce the world records—155 lm for brightness and 136 lumens/W for efficacy. The semiconductor light sources are also suitable for high operating currents. At 1.4A, they can produce up to 500 lumens of white light. This means that the LEDs can later be used not only for general lighting tasks and automotive applications but also for LED projection as blue and green chip versions.

"It was the successful combination of Osram know-how in different fields that led to these new records in efficiency and brightness. Starting with the light converter, we will be gradually moving the new developments into productio," commented Rudiger Muller, CEO at Osram.

The company has applied for patents for the technologies behind these achievements.





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