Journal
SYNTHETIC METALS
Volume 111, Issue -, Pages 421-424Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/S0379-6779(99)00387-2
Keywords
light-emitting; electroluminescence; hole transport; cyclic voltammetry; indolocarbazoles
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A variety of 5,11-diaryl-5,11-dihydroindolo[3,2-b]carbazole derivatives have been synthesized for use as hole-transport layers in organic light-emitting devices (OLED). The new hole-transport molecules (HTM) possess several salient features: (i) exceptionally high glass transition temperatures; (ii) ready evaporation to form uniform thin films; and (iii) ideal ionization potentials matched to indium-tin oxide (ITO) anode. Cyclic voltammetry (CV) of these molecules exhibits reversible redox behavior. OLEDs utilizing this type of molecules in their hole-transport layers have demonstrated low threshold voltages and excellent current-voltage (J-V) characteristics. (C) 2000 Elsevier Science S.A. All rights reserved.
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