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Song, Myoung Hoon
Organic Photonics & Optoelectronics Lab
Research Interests
  • Organic optoelectrics, perovskite light-emitting diodes, surface treatment, photonic crystals

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The Influence of Side-Chain Position on the Optoelectronic Properties of a Red-Emitting Conjugated Polymer

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Title
The Influence of Side-Chain Position on the Optoelectronic Properties of a Red-Emitting Conjugated Polymer
Author
Lu, Li PingFinlayson, Chris E.Kabra, DineshAlbert-Seifried, SebastianSong, Myoung HoonHavenith, Remco W. A.Tu, GuoliHuck, Wilhelm T. S.Friend, Richard H.
Keywords
Computational simulation; Device optimization; Device performance; Geometrical differences; Optical and electrical properties; Optoelectronic properties; Organic electronics; Photoluminescence quantum efficiency
Issue Date
201305
Publisher
WILEY-V C H VERLAG GMBH
Citation
MACROMOLECULAR CHEMISTRY AND PHYSICS, v.214, no.9, pp.967 - 974
Abstract
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. The optical and electrical properties of the organic semiconductor F8TBT are tailored by changing the position of the alkyl side chains. A conventional form of F8TBT (F8TBT-out) and a form with varied alkyl side-chain position, F8TBT-in, are directly compared in terms of optical properties and light-emitting-diode device performance. This illustrates how the placement of side chains has a very important role for device optimization.
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DOI
http://dx.doi.org/10.1002/macp.201200681
ISSN
1022-1352
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