Phosphorescent Organic Light-emitting Device with an Ambipolar Oxadiazole Host
Resource
Applied Physics Letters 90: 243501
Journal
Applied Physics Letters
Journal Issue
243501
Pages
-
Date Issued
2007
Date
2007
Author(s)
Abstract
In this latter, the authors demonstrated a phosphorescent organic light-emitting device (OLED) with a lower driving voltage and a longer operation lifetime based on 2, 2′ -bis[5-phenyl-2-(1,3,4)oxadazolyl]biphenyl, an oxadiazole (OXD) derivative, as the host of the emitting layer doped with a common green-emitting phosphorescent dopant, fac-tris(2-phenylpyridine) iridium [Ir (ppy)3]. Rather than an electron transporting materials, the OXD exhibits an ambipolar transport characteristic with suitable Ir (ppy)3 concentrations due to its low highest occupied molecular orbital value (5.9 eV) and the hole-transporting characteristics of Ir (ppy)3. It results in a 2.4 V voltage reduction and a 2.6 times lifetime elongation of the OXD-based device, as compared to the conventional phosphorescent OLED. © 2007 American Institute of Physics.
Type
journal article
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