Poly(tetraarylindenofluorene)s:  New Stable Blue-Emitting Polymers

The problem of long wavelength emission from ketone defects in polyindenofluorenes can be overcome by the introduction of aryl substituents which are much less susceptible to oxidation. A new polyindenofluorene with octylphenyl side chains has been prepared via a terphenyl intermediate. Unlike alkyl...

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Bibliographic Details
Published in:Macromolecules 2003-11, Vol.36 (22), p.8240-8245
Main Authors: Jacob, Josemon, Zhang, Jingying, Grimsdale, Andrew C, Müllen, Klaus, Gaal, Martin, List, Emil J. W
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Polymers with particular properties
Preparation, kinetics, thermodynamics, mechanism and catalysts
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Summary:The problem of long wavelength emission from ketone defects in polyindenofluorenes can be overcome by the introduction of aryl substituents which are much less susceptible to oxidation. A new polyindenofluorene with octylphenyl side chains has been prepared via a terphenyl intermediate. Unlike alkyl-substituted polyindenofluorenes, this displays stable blue emission in the solid state. Blue-emitting LEDs have been fabricated whose emission is stable at voltages below 10 V, with brightnesses of up to 125 cd/m2 and efficiencies of up to 0.11 cd/A. Furthermore, no emission from ketone defects was detected even in devices run at voltages above 20 V.
ISSN:0024-9297
1520-5835
DOI:10.1021/ma034849m