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Efficient, visible organic light-emitting diodes utilizing a single polymer layer doped with quantum dots
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We demonstrate organic light-emitting diodes(OLEDs) using a single active layer consisting of quantum dots(QDs) dispersed in poly (9,9-dioctylfluorene) (PFO). The diodes have an external quantum efficiency of and reach at . These results are comparable to complex, multilayer QDOLEDs. Built-in potential measurements show that the QD valence levels are shifted to lower binding energy when compared to quantum confinement based estimates, and are close to PFO valence levels. Devices using red and green QDs emit predominantly from the QDs but the spectrum of blue QDs is perturbed by interactions with PFO.
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