In this letter, we present and analyze the device performance of the mixed host ͑MH͒ organic light-emitting devices ͑OLEDs͒. The host of the emitting layer ͑EML͒ material in this device consists of a hole transport layer ͑HTL͒ and an electron transport layer ͑ETL͒ fabricated by coevaporation. The bipolar transport characteristic of the MH layer helps to reduce the driving voltage. Device lifetime is increased due to the elimination of the sharp boundary of the HTL/EML interface. Combining the MH structure with a high mobility electron ETL material, bis͑10-hydroxybenzo͓h͔qinolinato͒beryllium, the OLED has shown a brightness of 27 600 cd/ m 2 at a driving voltage of 5 V, and a lifetime four times longer than that of a conventional OLED.
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