Blue LED chips claim eight percent efficiency gain
The company claims there has been an increase in efficiency of up to eight percent. Optimized InGaN chips (Indium-Gallium-Nitride) featuring UX:3 chip technology are the basis for blue or white LEDs – and are already used in production. Osram’s experts forecast that there is potential to reduce the value by a further 20 to 30 mV by the summer of 2015 – offering a further boost in efficiency.
The blue Osram Oslon Square (LD CQAR) now has a typical forward voltage of 2.87 V instead of the 3.05 V specified so far in the data sheet – the lowest typical values in this component class worldwide. At 85°C a voltage of 2.78 V can be achieved in the component. Depending on the operating point, this translates into an increase in efficiency of these LEDs of six to eight percent, which can be transferred to the entire UX:3 chip family. The chips can be found in all blue and white LEDs. The LEDs are used in a wide range of applications in street lighting and industrial lighting. “The reduction in forward voltage was achieved thanks to a new process in the epitaxy”, said Dr. Marcus Eichfelder, Project Manager. Production of the first optimized chips started back in August 2014.
“In the laboratory we have already succeeded in further reducing the forward voltage by as much as 30 mV,” explained Dr. Joachim Hertkorn, Epitaxy expert at Osram Opto Semiconductors. This would improve the efficiency of the LED chips by a further percentage point.
“In view of the speed with which this first step has been implemented, we are confident that the improved process can be transferred to production by the summer of 2015”, added Hertkorn. “Any further reductions in forward voltage will then only be marginal owing to the laws of physics.”
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