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The Influence of Side‐Chain Position on the Optoelectronic Properties of a Red‐Emitting Conjugated Polymer
Author(s) -
Lu Li Ping,
Finlayson Chris E.,
Kabra Dinesh,
AlbertSeifried Sebastian,
Song Myoung Hoon,
Havenith Remco W. A.,
Tu Guoli,
Huck Wilhelm T. S.,
Friend Richard H.
Publication year - 2013
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.201200681
Subject(s) - side chain , conjugated system , light emitting diode , materials science , alkyl , photoluminescence , optoelectronics , polymer , diode , oled , absorption (acoustics) , polymer chemistry , chemistry , nanotechnology , organic chemistry , composite material , layer (electronics)
A study of the organic semiconductor F8TBT is presented, directly comparing a conventional form (F8TBT‐out) with a form with varied alkyl side‐chain position (F8TBT‐in), in terms of optical properties and device performance in light‐emitting‐diodes (LEDs). Computational simulations of the side‐chain position with respect to the TBT unit reveal geometrical differences between F8TBT‐out and F8TBT‐in. π–π conjugation on the backbone of F8TBT‐in is interrupted by a distortion of the benzothiadiazole ring, leading to a blue‐shift of the absorption spectrum and increased photoluminescence quantum efficiency. Both conventional and hybrid LEDs demonstrate that devices with F8TBT‐in show improved performance, as compared to F8TBT‐out, illustrating how tuning the optoelectronic properties of conjugated polymers by varying the placement of side chains has an important role in device optimization.