Di, DaweiYang, LeRichter, Johannes M.Meraldi, LorenzoAltamimi, Rashid M.Alyamani, Ahmed Y.Credgington, DanMusselman, Kevin P.MacManus-Driscoll, Judith L.Friend, Richard H.2018-05-082018-05-082017-04-04http://dx.doi.org/10.1002/adma.201605987http://hdl.handle.net/10012/13250Solution-processed polymer organic light-emitting diodes (OLEDs) doped with triplet-triplet annihilation (TTA)upconversion molecules, including 9,10-diphenylanthracene, perylene, rubrene and TIPS-pentacene, are reported. The fraction of triplet-generated electroluminescence approaches the theoretical limit. Record-high efficiencies in solution-processed OLEDs based on these materials are achieved. Unprecedented solid-state TTA-upconversion quantum yield of 23% (TTA-upconversion reaction efficiency of 70%) at electrical excitation well below one-sun equivalent is observed.enAttribution 4.0 InternationalPhoton-Up-ConversionOrganic Electroluminescent DevicesLow-PowerAnnihilationSingletStatePhotosensitizersPhotooxidationNanoparticlesFluorescenceArticle