Physicists from the Technical University of Dresden, together with Novaled has developed a new white OLEDs with efficiency of 90lm/w. They have used a new emission layer design and improved light outcoupling concepts. In fact, with special 3D outcoupling measures, they have achieved 124 lm/W.
Both values
were determined in an integrating sphere with blocked substrate edges,
only taking the light into account that is emitted to the forward
hemisphere, CIE color coordinates are (0.41/0.49). An in depth article
is published in today’s highly esteemed research journal ‘nature’.
The potential of the devices is obvious when one considers that even at
the very high brightness of 5,000 cd/m2 a power
efficiency of 74 lm/W is obtained, comments Prof. Karl Leo, Director of the Institute of Applied Photophysics (IAPP, TU Dresden). Thus high-intensity illuminations at very high efficiencies are
possible as well.
When I look in my CIE diagram the color point 0.41/0.49 is yellow like a citron. Sorry. In my opinion is this only a result for a press release and not a real product driven success.