The accelerated pre-oxidation method (APOM) was applied to heal progressive electrical short (PES) in organic light-emitting devices. The APOM applied to the devices showed approximately 100 times lower leakage current and 25% improvement in device efficiency compared to a normal device without the APOM applied. The mean projected lifetime of the APOM devices was more than 2400 h at initial luminance of 100 cd/m2 and 90 °C, whereas the normal device turned off after 15 h of operation at the same temperature due to the PES phenomenon. The best stability at elevated temperature was achieved by using the APOM for the cathode layer.

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in SMST-94: The Proc. of the Int. conf. on shape memory and superelastic technol.Since the pioneering works in organic light-emitting devices (OLED) based on both small molecules and polymers, [1,2] the charge carrier injection from an electrode to an organic semiconducting layer has been one of the important research topics. [3] In addition to sufficient charge carrier injection for high luminance, the balanced injection and transport of electrons and holes is crucial in order to achieve high COMMUNICATIONS ADVANCED ENGINEERING MATERIALS 2005, 7, No. 11

We report on efficient blue organic light-emitting devices with an emission layer featuring a quasi-molecular quantum dot nanostructure as a charge carrier confining barrier, which was formed by doping a wide band gap molecule, 2-(2-hydroxyphenylbenzoxazole) lithium, into a newly synthesized blue host molecule, 9,10-bis-[4-(2,2-diphenylvinyl)-phenyl]-anthracene. The charge carrier confinement was greatly improved by doping with 10% wide band gap molecules, that led to a theoretical molecular quantum dot distance of 33 Å. The device showed enhanced efficiency () and good colour purity (x = 0.16,y = 0.15), while the projected device lifetime reached approximately 20 000 h at 150 cd m−2.

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