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Substituent Effect To Prevent Autoxidation and Improve Spectral Stability in Blue Light‐Emitting Polyfluorenes
Author(s) -
Li Jiu Yan,
Ziegler Andreas,
Wegner Gerhard
Publication year - 2005
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200401319
Subject(s) - polyfluorene , electroluminescence , materials science , fluorene , photoluminescence , photochemistry , thermal stability , polymer , substituent , liquid crystal , fluorescence , autoxidation , optoelectronics , organic chemistry , chemistry , optics , nanotechnology , composite material , layer (electronics) , physics
A group of fluorene‐based polymers, PF‐1SOR and PF‐2SOR , were synthesized and characterized as blue light‐emitting materials. PF‐1SOR and PF‐2SOR displayed nematic liquid crystalline mesophase in films cast from solution. Compared with conventional polyfluorene, PF‐1SOR and PF‐2SOR display blue‐shifted UV absorption and structureless blue fluorescence. The photoluminescence spectra of PF‐1SOR and PF‐2SOR were found insensitive against thermal treatment in air up to 200° C and the blue electroluminescence in their light‐emitting devices was independent of the driving voltage. Compared to the conventional polyfluorenes, the improved spectral stability of these polymers is attributed to the anti‐oxidization effect of (3,5‐di( tert ‐butyl)phenoxy)sulfonyl side groups attached to the backbone.