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Issue 15, 2018
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Highly efficient white electroluminescence from dual-core star-shaped single polymer: performance improved by changing the non-emissive core

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Abstract

Two series of dual-core star-shaped polyfluorenes (DC-TPAs and DC-SBFs) based on a small quantity of green-emitting phenylmaleimide cores and a good deal of non-emissive cores were prepared by a one-pot Suzuki reaction. Triphenylamine (TPA) and 9,9-spirobifluorene (SBF) are employed as the non-emissive cores to construct DC-SBFs and DC-TPAs, respectively. Due to the π-conjugation extended by the fluorene units, the phenylmaleimide core displays a yellow emission which contributes to the white emission with the blue-emitting polyfluorene arms. DC-SBFs with four arms exhibit a better protection for emissive cores and a higher energy transfer efficiency than DC-TPAs with three arms. Consequently, the quantum yield of white emission of the polymers in the film was improved by changing TPA into SBF as the non-emissive core, reaching 0.80 for DC-SBF03. Additionally, the electrons and holes can be transported smoothly in DC-SBFs. A very high electroluminescent efficiency was obtained for DC-SBF03 with a maximum luminous efficiency of 17.4 cd A−1, power efficiency of 10.9 lm W−1 and external quantum efficiency of 6.2% when applied in the solution-processing white polymeric light-emitting devices (WPLEDs) with a LiF/Al cathode. The results denote that the non-emissive core plays a key role in the performance of the star-shaped single white polymers. It provides another way to improve the efficiencies of WPLEDs by designing simple non-emissive cores of the dual-core polymers, and avoiding the complicated synthesis of fluorophores.

Graphical abstract: Highly efficient white electroluminescence from dual-core star-shaped single polymer: performance improved by changing the non-emissive core

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Publication details

The article was received on 16 Dec 2017, accepted on 25 Mar 2018 and first published on 27 Mar 2018


Article type: Paper
DOI: 10.1039/C7TC05787C
Citation: J. Mater. Chem. C, 2018,6, 4318-4324
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    Highly efficient white electroluminescence from dual-core star-shaped single polymer: performance improved by changing the non-emissive core

    Y. Zhao, Z. Liu, J. Wang, Y. Chen, G. Cui, W. Xiao, Z. Lin and Q. Ling, J. Mater. Chem. C, 2018, 6, 4318
    DOI: 10.1039/C7TC05787C

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