[en] Three different p-conjugated oligomers (a blue-emitting oligofluorene, a green-emitting oligo(phenylene vinylene), and a red-emitting perylene bisimide) have been functionalized with self-complementary quadruple hydrogen bonding ureidopyrimidinone (UPy) units at both ends. The molecules self-assemble in solution and in the bulk, forming supramolecular polymers. When mixed together in solution, random noncovalent copolymers are formed that contain all three types of chromophores, resulting in energy transfer upon excitation of the oligofluorene energy donor. At a certain mixing ratio, a white emissive supramolecular polymer can be created in solution. In contrast to their unfunctionalized counterparts, bis-UPy-chromophores can easily be deposited as smooth thin films on surfaces by spin coating. No phase separation is observed in these films, and energy transfer is much more efficient than in solution, giving rise to white fluorescence at much lower ratios of energy acceptor to donor. Light emitting diodes based on these supramolecular polymers have been prepared from all three types of pure materials, yielding blue, green, and red devices, respectively. At appropriate mixing ratios of these three compounds, white electroluminescence is observed. This approach yields a toolbox of molecules that can be easily used to construct p-conjugated supramolecular polymers with a variety of compositions, high solution viscosities, and tuneable emission colors.
Disciplines :
Chemistry
Author, co-author :
Abbel, R.
Grenier, C.
Pouderoijen, M.J.
Stouwdam, J.W.
Leclère, Philippe ; Université de Mons > Faculté des Sciences > Chimie des matériaux nouveaux
Sijbesma, R.P.
Meijer, E.W.
Schenning, A.P.H.J.
Language :
English
Title :
White-Light Emitting Hydrogen-Bonded Supramolecular Copolymers Based on pi-Conjugated Oligomers
Publication date :
21 January 2009
Journal title :
Journal of the American Chemical Society
ISSN :
0002-7863
Publisher :
American Chemical Society, United States - District of Columbia
Volume :
131
Issue :
2
Pages :
833-843
Peer reviewed :
Peer Reviewed verified by ORBi
Research unit :
S817 - Chimie des matériaux nouveaux
Research institute :
R400 - Institut de Recherche en Science et Ingénierie des Matériaux
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