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|
“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.