High-Efficiency Red OLED Material
Brian Dance, Contributing Editor -- Semiconductor International, 12/1/2001
Newly developed red phosphorescent materials are claimed to be up to 5× more power-efficient than the conventional fluorescent materials used in organic light-emitting devices (OLEDs) for full-color displays. This development was reported in October by Raymond Kwong of Universal Display Corp. (Ewing, N.J.) at the 21st International Display Research Conference in Nagoya, Japan.
Kwong reported on a new class of organometallic complexes as red phosphorescent dopants for full-color OLED displays that his company calls "PHOLED" technology. They were developed in collaboration with Princeton University (Princeton, N.J.) and the University of Southern California (Los Angeles). The red PHOLEDs can produce 11 cd/A for true red (CIE=0.65, 0.35) to 28 cd/A for orange-red (CIE=0.60, 0.40).
One of the key limitations of the power dissipation of a full-color OLED display is the efficiency of the red component, so this advance is particularly significant. "This breakthrough should enable full-color OLED displays to have significantly reduced power consumption when compared with fluorescent-based OLEDs or backlit liquid crystal displays," said Steven V. Abramson, Universal Display president. "This power saving will translate into longer battery life that is especially important for mobile display applications."
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