In:
Applied Physics Letters, AIP Publishing, Vol. 90, No. 24 ( 2007-06-11)
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 (5.9eV) and the hole-transporting characteristics of Ir(ppy)3. It results in a 2.4V voltage reduction and a 2.6 times lifetime elongation of the OXD-based device, as compared to the conventional phosphorescent OLED.
Type of Medium:
Online Resource
ISSN:
0003-6951
,
1077-3118
Language:
English
Publisher:
AIP Publishing
Publication Date:
2007
detail.hit.zdb_id:
211245-0
detail.hit.zdb_id:
1469436-0
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