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Organic light emitting device having multiple separate emissive layers

United States Patent

8,143,613
March 27, 2012
View the Complete Patent at the US Patent & Trademark Office
An organic light emitting device having multiple separate emissive layers is provided. Each emissive layer may define an exciton formation region, allowing exciton formation to occur across the entire emissive region. By aligning the energy levels of each emissive layer with the adjacent emissive layers, exciton formation in each layer may be improved. Devices incorporating multiple emissive layers with multiple exciton formation regions may exhibit improved performance, including internal quantum efficiencies of up to 100%.
Forrest; Stephen R. (Ann Arbor, MI)
The Regents of the University of Michigan (Ann Arbor, MI)
11/ 945,910
November 27, 2007
GOVERNMENT RIGHTS This invention was made with U.S. Government support under Contract No. DE-FC26-04NT42272 awarded by the Department of Energy. The government has certain rights in this invention.