New light‐emitting poly{(9,9‐di‐n‐octylfluorenediyl vinylene)‐alt‐[1,5‐(2,6‐dioctyloxy)naphthalene vinylene]}

Abstract

A new conjugated light‐emitting AB copolymer containing alternating fluorene and naphthalene units, poly{(9,9‐di‐n‐octylfluorenediyl vinylene)‐alt‐[1,5‐(2,6‐dioctyloxy)naphthalene vinylene]} (PFV‐alt‐PNV), was synthesized via Horner‐Emmons polymerization. The polymer is completely soluble in common organic solvents and exhibits good thermal stability up to 400 °C. UV‐visible, fluorescence and photoluminescence measurements of the copolymer show peak maxima at 427, 500 and 526 nm, respectively. A light‐emitting device containing the new polymer was fabricated using a simple indium tin oxide configuration: (ITO)/PEDOT:PSS/PFV‐alt‐PNV/Al. Measurements of current versus electric field were carried out, with an onset of light emission occurring at 2.5 V. The electroluminescence brightness was observed to reach a maximum of 5000 cd m−2. Copyright © 2011 Society of Chemical Industry

Synthesis of High Molecular Weight 1,4-Polynaphthalene for Solution-Processed True Color Blue Light Emitting Diode

“…Naphthalene-based molecules attribute large band gaps; hence, these are suitable for blue luminescence. Accordingly, naphthalene-containing polymers were developed for blue emitting OLEDs. − Compared to small molecules, polymers with high molecular weight are preferred for device fabrication since small molecules tend to crystallize and phase segregate within devices . Although naphthalene-based small molecules are reported for pure blue electroluminescent properties, to the best of our knowledge naphthalene-based polymers with high molecular weight for the same are hitherto unknown.…”

Hydrophilic Conjugated Polymers Prepared by Aqueous Horner–Wadsworth–Emmons Coupling

“…These routes often generate structural defects, such as triple bonds and products of incomplete elimination. Direct routes to PAVs include transition-metal-catalyzed polymerizations (i.e., Heck and Stille couplings), metathesis polymerizations, and transition-metal-free polymerizations. − Horner–Wadsworth–Emmons (HWE) coupling represents a simple and effective approach to PAVs, giving reasonably high molecular weight and defect-free polymers, with a high degree of trans olefins, without the need for metals or catalysts. − PAV production by HWE coupling is typically performed in organic solvents using electron-rich monomers and strongly basic conditions.…”

Improving the performance of polymer light-emitting devices with chemical tools

“…Alternative vinyl‐linked donor–acceptor copolymers have also been investigated. Among these, triarylamine vinylene oxadiazole, phenothiazine vinylene anthracene, phenothiazine vinylene benzotriazole, PPV derivatives (Ar 3 N or carbazole vinylene oxadiazole or quinoxaline), thiophene vinylene oxadiazole, fluorene vinylene naphthalene and 1,4‐(2,5‐dihexadecyloxyphenylene)‐vinylene‐2,5‐linked pyridine or a 5,8‐linked 2,3‐diphenylpyrido[3,4‐ b ]pyrazine were used as single emissive layers in electroluminescent devices. A green‐emitting polymer containing hole‐deficient triphenylamine and electron‐deficient oxadiazole units was described as being efficiently electroluminescent in a device with the structure ITO/PEDOT:PSS/polymer/CsF/Al.…”