Purified polar polyfluorene for light-emitting diodes and light-emitting electrochemical cells

Abstract

Conjugated ployfluorene with 2-(2-(2-methoxyethoxy)ethoxy)ethyl groups (EO-PF) is prepared by the palladiumcatalyzed Suzuki coupling reaction. The polymer is purified carefully by a simple chemical procedure. The inductively coupled plasma (ICP) test shows palladium-catalyst in the polymer can be removed by this procedure. The thermal properties, electrochemical properties, UV-Vis absorption properties, photoluminescence properties and electroluminescent properties of the polymer without (EO-PF1) or with purification (EO-PF2) are studied. EO-PF2 shows better PL CIE coordinates in THF solutions as blue light-emitting materials and better photoluminescence stability in thin solid films. Polymer light emitting diodes and electrochemical cells based on EO-PF2 exhibit somewhat improved optoelectronic performance than control devices of EO-PF1.

Blue Light-Emitting Electrochemical Cells Based on Angularly Structured Phenanthroimidazole Derivatives

“…The use of fluorene based chromophores in blue LECs has come to the fore due to its innate efficient luminescence, which can be tuned to pure blue spectral region by modulating their conjugation length. ,,− Furthermore, ionic side chains can be incorporated into the fluorene structure without laborious synthetic steps to mitigate the need for additional ions in the formation of a p-i-n junction during operation of LECs. Following the impressive reports from Su and co-workers, , our group has synthesized an ionic fluorene derivative endorsed with pyrene moiety to generate blue emission from LECs .…”

Synthesis and solar cells applications of EO‐PF‐DTBT polymer

“…Poly‐ether group is widely introduced into the polyfluorene side chain to act as Li salt transporting materials in polymer light emitting electrochemical cell . There also are reports that poly‐ether with Li slat blend can be used as electrochemical dopant to form the p‐i‐n junction, which can help the carrier dissociation and charge transport in MEH‐PPV and PCBM BHJ solar cells .…”