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Stabilization of Semiconducting Polymers with Silsesquioxane
Author(s) -
Xiao S.,
Nguyen M.,
Gong X.,
Cao Y.,
Wu H.,
Moses D.,
Heeger A.J.
Publication year - 2003
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.200390000
Subject(s) - materials science , silsesquioxane , electroluminescence , polymer , thermal stability , photoluminescence , absorption (acoustics) , photochemistry , polymer chemistry , optoelectronics , chemical engineering , nanotechnology , composite material , engineering , chemistry , layer (electronics)
Polyhedral oligomeric silsesquioxanes (POSS) anchored to poly(2‐methoxy‐5‐(2‐ethylhexyloxy)‐1.4‐phenylenevinylene) (MEH‐PPV) (MEH‐PPV–POSS), and to poly(9,9‐dihexylfluorenyl‐2,7‐diyl) (PFO) (PFO–POSS) were synthesized. Compared with the corresponding parent polymers, MEH‐PPV and PFO, MEH‐PPV–POSS and PFO–POSS have better thermal stability. MEH‐PPV–POSS and MEH‐PPV have identical absorption and photoluminescent (PL) spectra, both in solution and as thin films. They also have identical electroluminescent (EL) spectra. Devices made from MEH‐PPV–POSS exhibit higher brightness (1320 cd m –2 at 3.5 V) and higher external quantum efficiency (η ext = 2.2 % photons per electron) compared to MEH‐PPV (230 cd m –2 at 3.5 V and η ext = 1.5 % ph el –1 ). Compared with PFO in the same device configuration, PFO–POSS has improved blue EL emission and higher η ext .