Hole-transporting [3,3′]bicarbazolyl-based polymers and well-defined model compounds

Electro-active polymers containing electronically isolated N-phenyl-N-naphtylamine fragments

“…This observation demonstrates that polymers containing electronically isolated N-phenyl-Nnaphtylamine fragments have slightly lower I p s than that of widely used hole transporting poly(9-vinylcarbazole) (PVK). Layers of the PVK material have I p of about 5.95 eV [17].…”

Cross-linkable fluorenyl-substituted aromatic amines for polymeric hole transporting networks

“…The measurement method was, in principle, similar to that described by Miyamoto et al [12].The samples for the ionization potential measurement were prepared as we described earlier [13].…”

New Carbazole‐Based Hyperbranched Conjugated Polymer with Good Hole‐Transporting Properties

“…Carbazole moieties are one of the important construction blocks for hole‐transporting and electroluminescent materials 21–23. However, so far, most of carbazole‐containing oligomers and polymers, used as HTM, are those with linear structure,23–26 and less attention has been paid to hyperbranched structure. Recently, we have synthesized a new hyperbranched polymer (HB‐car), constructed fully by carbazole moieties, which exhibited enhanced hole‐transporting ability in comparison with the famous carbazole‐containing polymeric HTM, poly(vinylcarbazole) (PVK) 27.…”

“…Recently, we have synthesized a new hyperbranched polymer (HB‐car), constructed fully by carbazole moieties, which exhibited enhanced hole‐transporting ability in comparison with the famous carbazole‐containing polymeric HTM, poly(vinylcarbazole) (PVK) 27. On the other hand, among the reported carbazole‐based polymers, there are nearly no polymers in which the C–N bonds are present in the main chain, unlike other type of polymers, such as PVK, poly‐(3,6‐carbazole)s, poly(2,7‐carbazole)s, etc 21, 24–30. Therefore, to further develop more carbazole‐based hyperbranched HTM with good properties, and explore alternative synthetic route in addition to the relatively difficult one used previously,27 in this paper, we conveniently prepared a new “AB 2 + A 2 + B 2 ”‐type HPU with good solubility and high molecular weight constructed by carbazole moieties through carbon–nitrogen bonds via the standard copper‐catalyzed Ullmann condensation reaction (Scheme ).…”