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Synthesis and Characterization of Red‐Emitting Poly(aryleneethynylene)s Based on 2,5‐Bis(2‐ethylhexyl)‐3,6‐di(thiophen‐2‐yl)pyrrolo[3,4‐c]pyrrole‐1,4(2H,5H)‐dione (DPP)
Author(s) -
Palai Akshaya K.,
Mishra Sarada P.,
Kumar Amit,
Srivastava Ritu,
Kamalasanan Modeeparampil N.,
Patri Manoranjan
Publication year - 2010
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.200900706
Subject(s) - polymer , pedot:pss , absorption (acoustics) , pyrrole , chloroform , materials science , polymer chemistry , analytical chemistry (journal) , excited state , fluorescence , photochemistry , chemistry , optics , organic chemistry , physics , nuclear physics , composite material
Synthesis and characterization of a series of PAEs containing DPP units in the main chain are described. $\overline M _{\rm w} $ of the polymers was in the range 10 800–111 900. The polymers formed a deep blue solution in chloroform with absorption maxima between 589 and 645 nm and optical band gaps ranging from 1.61 to 1.74 eV. When excited at the absorption maxima, the polymer solutions showed red fluorescence with emission maxima between 656 and 676 nm. The polymers exhibited quasi‐reversible oxidation process with HOMO energy levels between −5.60 and −6.17 eV. EL properties of three polymers were investigated with device configuration ITO/PEDOT:PSS/Polymer/LiF/Al. When appropriate bias voltage was applied, a red EL with a maximum brightness of 17.5–24 cd · m −2 could observe from the devices.