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Osram Opto demonstrates 142 lm/W warm-white LED
Post Time£º2011-08-26 15:40

Osram Opto Semiconductors claims to have set a new laboratory record of 142 lm/W for the efficiency of a warm-white LED light source.
The LED had a correlated color temperature (CCT) of 2755 K, the LED has a color-rendering index (CRI) of 81.

Measurements were taken under standard conditions at room temperature and under pulsed-mode operation at an operating current density of 350 mA/mm2.

The laboratory setup for a warm white LED

Bright warm-white light with high efficiency is particularly important for lighting applications in the residential sector. The peak value of 142 lm/W measured under standard conditions is achieved at a color point ¨C with color coordinates of (x=0.46, y=0.41) on the Planckian curve ¨C that very closely matches the perception of a classic incandescent lamp.
¡°If we explore this technical approach further, and allow deviations from the Planckian curve, we should be able to achieve higher efficiency values of up to 160 lm/W for a CCT of 3000 K at (x=0.45, y=0.44),¡± said Norwin von Malm, Predevelopment Manager at Osram Opto Semiconductors.

¡°If we apply this approach to a 2 mm2 chip we can improve efficiency by a further 10 to 15 percent for the same operating current. We would then expect 180 lm/W for a pure warm-white LED with good color rendering.¡±

The increase in efficiency was made possible by combining new procedures in thin-film and UX:3 chip technologies and in conversion (i.e. phosphor technology). Osram Opto says that its development engineers have benefited from combined know-how in all aspects of the production process. These include epitaxial growth, thin-film chip architectures, conversion processes and package technologies.

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