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Macrocyclic and Acyclic Bis(2,5‐diphenyl‐1,3,4‐oxadiazole)s with Electron‐Transporting and Hole‐Blocking Ability in Organic Electroluminescent Devices
Author(s) -
Ono Katsuhiko,
Ezaka Seiichi,
Higashibata Akinori,
Hosokawa Ryohei,
Ohkita Masakazu,
Saito Katsuhiro,
Suto Michitaka,
Tomura Masaaki,
Matsushita Yosuke,
Naka Shigeki,
Okada Hiroyuki,
Onnagawa Hiroyoshi
Publication year - 2005
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200500122
Subject(s) - oxadiazole , intermolecular force , electroluminescence , chemistry , phosphorescence , intermolecular interaction , polymer chemistry , crystallography , molecule , organic chemistry , fluorescence , physics , layer (electronics) , quantum mechanics
Summary: Two types of bis(2,5‐diphenyl‐1,3,4‐oxadiazole)s, macrocyclic and acyclic, were prepared and evaluated as electron‐transporting and hole‐blocking materials in phosphorescent EL devices. Maximum efficiencies of η ext = 10.4% at J = 0.11 mA · cm −2 for the macrocycle and η ext = 14.1% at J = 3.01 mA · cm −2 for the acycle were observed. X‐ray crystallographic analysis and DSC measurements revealed a strong intermolecular interaction between the macrocycles and weaker intermolecular interactions between the acycles. The EL characteristics depend on the intermolecular interactions.The two types of bis(2,5‐diphenyl‐1,3,4‐oxadiazole)s used in the study.