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We fabricated polymer light-emitting diodes (PLEDs) operating in the ultraviolet (UV) region by a wet-process. The samples consist of only a simple bilayer polymer thin film, a hole-injection layer, and an active layer. It was found that the co-doping of the electron- and hole-transporting materials in the active layers plays an important role to improve the balance of the carrier injection into the active layer. We observed a peaking wavelength of 393 nm in the electroluminescence (EL) spectrum. In addition, the maximum external quantum efficiency was 1.8%, which was achieved using the optimal doping densities.

Polymer light-emitting diodes operating in ultraviolet region consisting of simple bilayer polymer thin film