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Effects of Random Copolymer’s Component Distribution on Opto-electronic Properties

Abstract

The effects of component distribution of red light-emitting random copolymer poly(9,9-dioctylfluorene-co-(4,7-dithienyl-benzothiadiazole)) (DOF : DBT = 9 : 1 mol/mol, PFO-DBT10) on their optoelectronic properties are systematically investigated. The PFO-DBT10 with various molecular weights (MW) have identical absorption spectra and energy levels. However, as the molecular weight increases, so does the photoluminescence intensity ratio of DBT to DOF segments. For the polymer light-emitting diodes, the PFO-DBT10 with large MW shows enhanced charge trapping effect, leading to increased operation voltage under any given current density, worse luminous efficiency, and more saturated red emission, compared to the one with small MW. The experiments are analyzed within the frame work of the component’s molar ratio dispersion of random copolymer chain induced by MW using the Binomial Distribution formula. According to the formula, the high MW random copolymer is analogous to the ideal PFO-DBT10 in terms of the uniformly distributed units. The low MW random copolymer is more likely to be a mixture of pure PFO and PFO-DBTx, in which the molar ratio x is various, due to its dispersive component distribution. The work offers a new approach to study the random copolymer’s opto-electronic properties in light of component distribution.

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Publication details

The article was received on 26 Mar 2017, accepted on 13 May 2017 and first published on 15 May 2017


Article type: Paper
DOI: 10.1039/C7TC01280B
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Effects of Random Copolymer’s Component Distribution on Opto-electronic Properties

    Z. Zhong, X. Wang, S. Zhao, F. Peng, J. Wang, L. Ying, W. Yang, J. Peng and Y. Cao, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC01280B

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