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A Direct Approach to Organic/Inorganic Semiconductor Hybrid Particles via Functionalized Polyfluorene Ligands
Author(s) -
de Roo Tjaard,
Haase Johannes,
Keller Janine,
Hinz Christopher,
Schmid Marius,
Seletskiy Denis V.,
Cölfen Helmut,
Leitenstorfer Alfred,
Mecking Stefan
Publication year - 2014
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201304036
Subject(s) - polyfluorene , materials science , photoluminescence , palladium , polymer chemistry , photochemistry , electroluminescence , nanotechnology , organic chemistry , optoelectronics , layer (electronics) , chemistry , catalysis
Controlled Suzuki–Miyaura coupling polymerization of 7′‐bromo‐9′,9′‐dioctyl‐fluoren‐2′‐yl‐4,4,5,5‐tetramethyl‐[1,3,2]dioxaborolane initiated by bromo(4‐ tert ‐butoxycarbonylamino‐phenyl)(tri‐ tert ‐butylphosphine)palladium ( 1 ) or bromo(4‐diethoxyphosphoryl‐phenyl)(tri‐ tert ‐butylphosphine)palladium ( 2 ) yields functionalized polyfluorenes (M n = 4 × 10 3 g mol −1 , M w /M n < 1.2) with a single amine or phosphonic acid, respectively, end‐group. High temperature synthesis of cadmium selenide quantum dots with these functionalized polyfluorenes as stabilizing ligands yields hybrid particles consisting of good quality (e.g. emission full width at half maximum of 30 nm; size distribution σ < 10%) inorganic nanocrystals with polyfluorene attached to the surface, as corroborated by transmission electron microscopy analysis and analytical ultracentrifugation. Sedimentation studies on particle dispersions show that a substantial portion (ca. half) of the phosphonic acid terminated polyfluorene ligands is bound to the inorganic nanocrystals, versus ca. 5% for the amino‐functionalized polyfluorene ligands. Single particle micro‐photoluminescence spectroscopy shows an efficient and complete energy transfer from the polyfluorene layer to the inorganic quantum dot.