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Proceedings Paper

Reduced excimer formation in polyfluorenes by introducing coil-like poly[penta(ethylene glycol) methyl ether methacrylate] block segments
Author(s): Seung Ju Noh; Seong Ik Heo; Se Hyun Jang; Haeng Hee Ahn; Jin Young Han; Min Gyun Suk; Sun Jin Jin; Yong Ku Kwon
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Paper Abstract

The formation of the aggregate and excimer in light-emitting polyfluorenes during annealing at high temperatures was reduced by adding coil-like block segments through atom transfer radical polymerization (ATRP), initialized by 2- bromoisobutyrate end-capped PF macroinitiator using CuBr/N,N,N',N',N''-pentamethyldiethylenetriamine (PMDETA) catalyst system. The rod-like macroinitiator was synthesized by the Yamamoto-type coupling using a Ni(COD)2 catalyst. The structure and physical properties were characterized by 1H NMR, thermal analysis, GPC, photoluminescence, small angle X-ray scattering and transmission electron microscopy. The addition of the coil-like block segments to the rod-like block segment resulted in the microphase separation between the component blocks which decreased the effective conjugation length of the conjugated moieties. The photoluminescence spectra measured from the thin films of the block copolymers revealed that the coil-like endblocks, attached to the conjugated block segments, suppressed the excimer formation of the PF molecules during annealing at high temperature.

Paper Details

Date Published: 13 September 2012
PDF: 5 pages
Proc. SPIE 8476, Organic Light Emitting Materials and Devices XVI, 847623 (13 September 2012); doi: 10.1117/12.930589
Show Author Affiliations
Seung Ju Noh, Inha Univ. (Korea, Republic of)
Seong Ik Heo, Inha Univ. (Korea, Republic of)
Se Hyun Jang, Inha Univ. (Korea, Republic of)
Haeng Hee Ahn, Inha Univ. (Korea, Republic of)
Jin Young Han, Inha Univ. (Korea, Republic of)
Min Gyun Suk, Inha Univ. (Korea, Republic of)
Sun Jin Jin, Inha Univ. (Korea, Republic of)
Yong Ku Kwon, Inha Univ. (Korea, Republic of)

Published in SPIE Proceedings Vol. 8476:
Organic Light Emitting Materials and Devices XVI
Franky So; Chihaya Adachi, Editor(s)

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