Development of Large Bandgap Host Materials for Phosphorescent Emitters
Introduction The performance of organic light-emitting diodes (OLEDs) has improved dramatically over the past decades. However, the efficiencies of conjugated polymer-based phosphorescence devices usually are much lower than those of small-molecule based devices. Although external efficiencies of greater than 10% have been demonstrated by blending conjugated polymers with red phosphors, high efficiency polymer-based OLEDs using green- or blue emitting phosphors as dopants still have not been realized. It remains a challenging task to develop suitable conjugated polymer hosts for phosphorescent LED devices. Technology description Alex Jen’s laboratory has designed and synthesized a series of large bandgap polymers to be used as host materials for blue-green-and red-emitting phosphors in electrophosphorescence OLED devices. These polymers are useful as hosts for a broad range of phosphorescent emitters, from high-energy blue wavelengths to relatively lowenergy red wavelengths. As hosts for high-energy phosphorescent emitters, these polymers have sufficiently high triplet energy states so as to facilitate high-energy transfer to guest phosphorescent emitters and/or prevent phosphorescence quenching. Business Opportunity The worldwide OLED market is predicted to hit $10.9 billion by 2012 and grow to $15.5 billion by 2014. Intellectual property position There is a US patent pending on this technology.
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