Abstract
We have investigated the properties of ultraviolet organic light-emitting diodes (UV OLEDs) using an oxadiazole compound (OXD-7) as emitting materials and MoO3 as hole injection and buffer material. Results have demonstrated that the introduction of MoO3 can achieve a highly efficient UV OLED, which shows a high external quantum efficiency of 1.43% with a peak wavelength of 388nm. The impedance spectroscopy elucidates that the hole injection voltage is about 2V (via MoO3 interlayer) and 5V (without MoO3 interlayer), indicating that the MoO3 interlayer is critical to promote hole injection and achieve high device efficiency.
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