Citation:
LI Yan, ZOU Lu-Yi, REN Ai-Min. Charge Transport and Fluorescence Properties of a Series of Red-Emitting Materials Based on Benzothiadiazole and Silafluorene[J]. Acta Physico-Chimica Sinica,
;2014, 30(5): 855-865.
doi:
10.3866/PKU.WHXB201403113
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The ground and excited states, charge- transport, and fluorescence properties of a series of polymers based on benzothiadiazole and silafluorene were investigated using density functional theory (DFT). The band gaps, ionization potentials, electron affinities, the lowest excitation energies, and absorption spectra of the polymers were estimated by extrapolating those of the oli mers to infinite chain lengths. The results show that the hole/electron injection/transport abilities and the optical properties of the polymers are significantly affected by the position of the benzothiadiazole group on the silafluorene group and the position of the butyl group on the thiophene group. (SiF2-DHTBT1-m)n and (SiF1-DHTBT1-m)n [hereafter SiF and DHTBT are silafluorene and 4,7-di(2-thienyl)-2,1,3-benzothiadiazole, respectively] show od hole and electron injection performances but (SiF1-DHTBT1-o)n and (SiF1-DHTBT1-p)n exhibit poor carrier injection performances. The predicted emission spectra of the polymers are located in the red visible-light range, except in the case of (SiF1-DHTBT1-o)n.
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