Design, Synthesis, and Electroluminescent Property of CN−Poly(dihexylfluorenevinylene) for LEDs

Abstract

A new green electroluminescence polymer, CN-poly(dihexylfluorenevinylene) (CN-PDHFV), which denotes poly [(9,9-, was synthesized by condensation polymerization utilizing the Knoevenagel reaction. The resulting polymer exhibits good solubility in common organic solvents such as chloroform, THF, and ODCB. The polymer is also easily cast on a glass plate to green film. The UV-vis spectrum of the polymer exhibits characteristically a broad absorption band at 440 nm. This polymer shows photoluminescence around λ max ) 535 nm (exciting wavelength 410 nm) and green electroluminescence around λmax ) 530 nm. The current-voltage-luminance (I-V-L) characteristics of the polymer show a turn-on voltage of 4.8 V and a brightness of 600 cd/m 2 at 5.

Novel 4,7-Dithien-2-yl-2,1,3-benzothiadiazole-based Conjugated Copolymers with Cyano Group in Vinylene Unit for Photovoltaic Applications

“…15 It is reported that the bandgaps of the polymers were reduced by increasing the ratio of the vinylene groups to thiophene unit and incorporation of cyano group in the vinylene units. 16,17 The utilization of the cyano substituted vinylene unit coupled with DTBT moiety can provide effective electron deficient unit for the ICT.…”

Conductive and photoactive nature of conjugated polymer based on thiophene functionalized thiazole or benzothiadiazole

“…By attentively selecting the conjugated polymer backbone and side chains, we can alter a variety of photoluminescence and electroluminescence colors. Till now PPV has been reported with a variety of substituents such as alkoxy [5], fluorenyl [6], phenyl [7], alkyl [8], cyano group [9] or halides [10]. Among these PPV conjugated polymers, alkoxy PPV conjugated polymers with poor solubility are detrimental for device elaboration.…”

Blue‐Gap Poly(p‐phenylene vinylene)s with Fluorinated Double Bonds: Interplay Between Supramolecular Organization and Optical Properties in Thin Films

“…[26] Recently, PPVs with F atoms on the vinylene units, [27,28] that is, poly( p-phenylene difluorovinylene)s (PPDFVs), have been considered for optimizing PPV materials with blue-light emission. [29,30] The rationale for analyzing PPDFVs with fluorinated double bonds is two-fold. The presence of F atoms on double bonds has been reported [27] to increase the resistance of these polymers against double-bond photo-oxidation and to reduce the electron-injection barrier, both of which are major drawbacks to the widespread use of organic semiconductors in commercial electroluminescent devices.…”