A hydroxypohenyloxadiazole lithium complex as a highly efficient blue emitter and interface material in organic light-emitting diodes

摘要

We synthesized a hydroxyophenyloxadiazole lithium complex (LiOXD) as a blue light-emitting and electron injection/transport material to be used in double-layer organic electroluminescent devices.Devices with the concise configuration of ITO/TPD/LiOXD/Al showed bright blue EL emission centeree at 468 nm with a maximum luminance of 2900 cd m~(-2).A current efficiency of 3.9 cd A~(-1) and power efficiency of 1.1 1m W~(-1) were obtained.LiOXD was also examined as an interface material.The efficiency of an ITO/NPB/Alq_3/Al device increased considerably when LiOXD was inserted between Alq_3 and aluminium.The improvement of the device characteristics with LiOXD approached that observed with the dielectric LiF salt.