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

Abstract

Blue‐light‐emitting poly(p‐phenylene vinylene)s with fluorinated vinylene units are presented. It is demonstrated that self‐aggregation governs the strength and polarization of the absorption spectra of thin films of these polymers. This indicates that self‐assembly of the polymer chains in the films provides a means of tuning the electronic and optical properties of the π‐conjugated systems.

An effective method to prepare polymer/nanocrystal composites with tunable emission over the whole visible light range

“…The preparation of the PPV precursor can be found elsewhere [28][29][30][31][32][33]. Briefly, 10 mL of 0.4 mol/L NaOH was added to 10 mL of 0.4 mol/L p-xylylenebis (tetrahydrothiophenium chloride) solution in methanol.…”

“…Poly(p-phenylene vinylene) (PPV) and its derivatives are important functional polymers which have found applications in transistors, photovoltaic devices, and light-emitting diodes [28][29][30][31][32][33]. However, little attention has been paid to the PPV precursor [the sulfonium polyelectrolyte precursor of PPV], which is water soluble, has a high quantum yield (QY) and is easy to process.…”

Photoluminescence study of the surface modified and MEH-PPV coated cotton fibers

“…Various approaches are being investigated for addressing color tuning. Two of these include synthesis of copolymers and incorporation of ''luminescent dopants'', such as phosphorescent metal complexes, luminescent inorganic quantum dots and fluorescent organic dyes [18]. Unfortunately, this approach is somewhat costly in the fabrication process.…”

Color stability of conjugated polymer with difluoro groups in vinylene units

“…6,17 While the presence of electron-rich groups such as alkoxy groups in PPV derivatives increases the rate of singlet oxygen addition at the vinyl double bond, 18 the incorporation of electron-withdrawing groups, which generates a low rate of inter-system crossing and a low electron density at the reactive double-bond, improves the stability of the vinylene units of PPVs. 19 Recently, PPVs with fluorinated vinylene units, that is, poly(p-phenylene difluorovinylene)s (PPDFVs), have been investigated as a class of polymers with increased stability to double-bond photo-oxidation. [19][20][21][22] The another reason of introducing fluorine atoms on the vinylene units is to adjust the emission color by molecular design to modify the interchain interactions as a result of the torsional twisting angle deriving by steric repulsion between the fluorine atoms and their neighboring substituents.…”

“…19 Recently, PPVs with fluorinated vinylene units, that is, poly(p-phenylene difluorovinylene)s (PPDFVs), have been investigated as a class of polymers with increased stability to double-bond photo-oxidation. [19][20][21][22] The another reason of introducing fluorine atoms on the vinylene units is to adjust the emission color by molecular design to modify the interchain interactions as a result of the torsional twisting angle deriving by steric repulsion between the fluorine atoms and their neighboring substituents. 19 These reasons induce further investigation of PPDFV derivatives in order to better understand the role of fluorine atoms on vinylene units.…”