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White Electroluminescence by Supramolecular Control of Energy Transfer in Blends of Organic‐Soluble Encapsulated Polyfluorenes
Author(s) -
Brovelli Sergio,
Meinardi Francesco,
Winroth Gustaf,
Fenwick Oliver,
Sforazzini Giuseppe,
Frampton Michael J.,
Zalewski Leszek,
Levitt James A.,
Marinello Francesco,
Schiavuta Piero,
Suhling Klaus,
Anderson Harry L.,
Cacialli Franco
Publication year - 2010
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.200901764
Subject(s) - polyfluorene , materials science , electroluminescence , chromophore , förster resonance energy transfer , intermolecular force , raman spectroscopy , oled , polymer , fluorescence , supramolecular chemistry , photochemistry , nanotechnology , molecule , optics , organic chemistry , composite material , chemistry , physics , layer (electronics)
Abstract Here, it is demonstrated that energy transfer in a blend of semiconducting polymers can be strongly reduced by non‐covalent encapsulation of one constituent, ensured by threading of the conjugated strands into functionalized cyclodextrins. Such macrocycles control the minimum intermolecular distance of chromophores with similar alignment, at the nanoscale, and therefore the relevant energy transfer rates, thus enabling fabrication of white‐light‐emitting diodes (CIE coordinates: x = 0.282, y = 0.336). In particular, white electroluminescence in a binary blend of a blue‐emitting, organic‐soluble rotaxane based on a polyfluorene derivative and the green‐emitting poly(9,9‐dioctylfluorene‐alt‐benzothiadiazole ( F8BT ) is achieved. Morphological and structural analyses by atomic force microscopy, fluorescence mapping, µ‐Raman, and fluorescence lifetime microscopy are used to complement optical and electroluminescence characterization, and to enable a deeper insight into the properties of the novel blend.