Macrocyclic and Acyclic Bis(2,5-diphenyl-1,3,4-oxadiazole)s with Electron-Transporting and Hole-Blocking Ability in Organic Electroluminescent Devices
✍ Scribed by Katsuhiko Ono; Seiichi Ezaka; Akinori Higashibata; Ryohei Hosokawa; Masakazu Ohkita; Katsuhiro Saito; Michitaka Suto; Masaaki Tomura; Yosuke Matsushita; Shigeki Naka; Hiroyuki Okada; Hiroyoshi Onnagawa
- Book ID
- 102486974
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 166 KB
- Volume
- 206
- Category
- Article
- ISSN
- 1022-1352
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✦ Synopsis
Abstract
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.
magnified imageThe two types of bis(2,5‐diphenyl‐1,3,4‐oxadiazole)s used in the study.