OSRAM Opto Semiconductors has set a new laboratory record for the luminous efficiency of warm white LED light sources with a luminous efficacy of 142 lm/W. At a relative color temperature (CCT) of 2755K, the color rendering index (CRI) of the LED is as high as 81. These data were measured in standard conditions: pulse mode at room temperature and operating current density of 350 mA/mm2.
Bright and efficient warm white light is essential for lighting applications in the home industry. This laboratory test for warm white LEDs shows that these energy-saving semiconductor light sources have great potential. In the standard case, the measured light efficiency is up to 142 lm/W, and the color feels very close to the typical incandescent lamp (the color coordinates on the Planckian track are cx 0.46/ cy 0.41).
Dr. Norwin von Malm, former development manager of OSRAM Opto Semiconductors Germany, stated: “If we explore this technology further and allow deviation from the Planckian trajectory, we should be able to achieve higher luminous efficiency values ​​at a relative color temperature of 3000K (color coordinates) With cx 0.45/ cy 0.44), the luminous efficiency is up to 160 lm/W. If we apply this method to a 2 mm2 chip, we can increase the efficiency by 10% to 15% at the same operating current, and we can It is foreseen that the brightness of pure white LEDs can reach 180 lm/W and has good color rendering."
Luminous efficiency is enhanced by new procedures and transfer techniques that combine thin film and UX:3 chip technology. It has gathered the expertise of various production processes, including epitaxial growth, thin-film chip architecture, transfer process and packaging technology, which has benefited the development engineers of OSRAM Opto Semiconductors.
This laboratory test for warm white LEDs has a luminous efficacy of up to 142 lm/W directly on Planck's trajectory at 2700K. If it is adjusted to the best condition with 3000K, the luminous efficiency can reach 160 lm/W.
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