Journal
ORGANIC ELECTRONICS
Volume 9, Issue 1, Pages 77-84Publisher
ELSEVIER
DOI: 10.1016/j.orgel.2007.09.002
Keywords
amorphous material; hole blocking; electron transporting; triazole; electroluminescent device; OLED; phosphorescent device; mobility; pyridine
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We have demonstrated bipyridyl substituted triazole derivatives (Bpy-TAZs) as an electron-transporting material for organic light-emitting devices (OLEDs). Substitution of triazole with bipyridyl is a good way to improve electron-transporting ability of triazoles with keeping good hole-blocking ability, which is a useful property of triazole derivatives. A Bpy-TAZ has high electron mobility of above 10(-4) cm(2)/V s. Moreover, by employing one of Bpy-TAZs as a hole-blocking and electron-transporting material for phosphorescent OLEDs, lower operation voltage was achieved with keeping the same external quantum efficiency of electroluminescence (almost 10%) as compared with the conventional hole-blocking and electron-transporting bilayer consisting of bathocuproine and tris (8-hydroxyquinolinato) aluminum. (c) 2007 Elsevier B.V. All rights reserved.
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