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(Color online) (a) Molecular structure of DPF and (b) brightness vs voltage of device I–IV.
(Color online) (a) characteristics of device V and (b) efficiency vs current density of device V. Inset is the schematic energy level diagram of device V.
(Color online) (a) Photoluminescence spectra of DPF and rubrene, and absorption spectrum of rubrene. (b) EL spectra of device VI at different applied voltages
Details of EL performance of the devices I–VI.
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