title: Conjugated Polymer Nanoparticle-Triplet Emitter Hybrids in Aqueous Dispersion: Fabrication and Fluorescence Quenching Behavior.
abstract: Conjugated polymer nanoparticles based on poly[9,9-bis(2-ethylhexyl)fluorene] and poly[N-(2,4,6-trimethylphenyl)-N,N-diphenylamine)-4,4'-diyl] are fabricated using anionic surfactant sodium dodecylsulphate in water by miniemulsion technique. Average diameters of polyfluorene and polytriarylamine nanoparticles range from 70 to 100 and 100 to 140 nm, respectively. The surface of the nanoparticles is decorated with triplet emitting dye, tris(2,2'-bipyridyl)ruthenium(II) chloride. Intriguing photophysics of aqueous dispersions of these hybrid nanoparticles is investigated. Nearly 50% quenching of fluorescence is observed in the case of dye-coated polyfluorene nanoparticles; excitation energy transfer is found to be the dominant quenching mechanism. On the other hand, nearly complete quenching of emission is noticed in polytriarylamine nanoparticle-dye hybrids. It is proposed that the excited state electron transfer from the electron-rich polytriarylamine donor polymer to Ru complex leads to the complete quenching of emission of polytriarylamine nanoparticles. The current study offers promising avenues for developing aqueous solution processed-electroluminescent devices involving a conjugated polymer nanoparticle host and Ru or Ir-based triplet emitting dye as the guest.
authors.affiliation: Department of Chemistry, Indian Institute of Science, Education and Research (IISER) Bhopal, Bhopal, 462066, India.
authors.forename: Sujoy
authors.initials: S
authors.lastname: Bandyopadhyay
authors.affiliation: PPSM, ENS Cachan, CNRS, UniverSud, 61 av President Wilson, 94230, Cachan, France.
authors.forename: Rémi
authors.initials: R
authors.lastname: Métivier
authors.affiliation: Department of Chemistry, Indian Institute of Science, Education and Research (IISER) Bhopal, Bhopal, 462066, India.
authors.forename: Pragyan
authors.initials: P
authors.lastname: Pallavi
authors.affiliation: Macromolecular Chemistry, Bergische University Wuppertal, Gauss-Str. 20, D-42119, Wuppertal, Germany.
authors.forename: Eduard
authors.initials: E
authors.lastname: Preis
authors.affiliation: PPSM, ENS Cachan, CNRS, UniverSud, 61 av President Wilson, 94230, Cachan, France.
authors.forename: Keitaro
authors.initials: K
authors.lastname: Nakatani
authors.affiliation: Max Planck Institute for Polymer Research, Department of Physical Chemistry of Polymers, Ackermannweg 10, D-55128, Mainz, Germany.
authors.forename: Katharina
authors.initials: K
authors.lastname: Landfester
authors.affiliation: Department of Chemistry, Indian Institute of Science, Education and Research (IISER) Bhopal, Bhopal, 462066, India.
authors.forename: Abhijit
authors.initials: A
authors.lastname: Patra
authors.affiliation: Macromolecular Chemistry, Bergische University Wuppertal, Gauss-Str. 20, D-42119, Wuppertal, Germany.
authors.forename: Ullrich
authors.initials: U
authors.lastname: Scherf
mesh_terms: D000588:Amines / Q000737:chemistry; D005449:Fluorenes / Q000737:chemistry; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D011108:Polymers / Q000737:chemistry*; D012428:Ruthenium / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D014867:Water / Q000737:chemistry*
chemical_list: D000588:Amines; D005449:Fluorenes; D011108:Polymers; D014867:Water; C041509:fluorene; D012428:Ruthenium
keywords: conjugated polymers; hybrids; nanoparticles; photophysics; triplet emitters