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Yichun Luo and Hany Aziz Correlation Between Triplet–Triplet Annihilation and Electroluminescence Efficiency in Doped Fluorescent Organic Light-Emitting Devices Advanced Functional Materials 20

Version of Record online: 22 MAR 2010 | DOI: 10.1002/adfm.200902329

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Three distinct formation mechanisms are determined for delayed electroluminescence (EL): type-I (trapped-charge-induced delayed EL), type-II (triplet–triplet-annihilation (TTA)-induced delayed EL), and type-III (mobile-charge-induced delayed EL). Among these three scenarios, type-II systems are found to give the highest OLED EL efficiency, a phenomenon attributed to the role of TTA in converting triplet excitons into additional singlet excitons.

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