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Isolated asymmetric bilateral steric conjugated polymers with thickness-independent emission for efficient and stable light-emitting optoelectronic devices

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Abstract

Isolating the mainchain of light-emitting conjugated polymers (LCPs) is an effective strategy to obtain ultrastable efficient deep-blue light-emitting devices for printed optoelectronics. Herein, considering the complicated excitonic behavior that is induced by an uncontrollable film morphology, we proposed a novel asymmetric bilateral steric (ABS) strategy to construct a highly steric wide bandgap LCP (PHPDPF-Cz) via suppressing the formation of the interchain excited state toward efficient organic lasers and deep-blue polymer light-emitting diodes (PLEDs). Two large steric biphenyl (∼1.0 nm) and carbazole (Cz) molecules are introduced into the mainchain asymmetrically localized at the 9- and 4-position to effectively suppress interchain interaction at the molecular level and achieve single-chain excitonic behavior. PHPDPF-Cz shows ultrastable deep-blue emission upon thermal annealing, air aging, and increasing film thickness, with respect to the controlled polymer. Therefore, our PHPDPF-Cz presents an excellent thermal-stable deep-blue lasing behavior with a low threshold of ∼2 μJ cm−2. Finally, efficient and stable deep-blue preliminary PLEDs are fabricated with single-molecule excitonic behavior, which present thickness-independent (80 nm to 250 nm) electroluminescence (EL) properties with a high current efficiency (C.E.) and external quantum efficiency (EQE) of 2.11 cd A−1 and 1.78%, respectively. Obviously, the morphology-independent efficient and stable EL behaviour is desirable for improving device reproducibility and stability, indicating their potential application in printed optoelectronics.

Graphical abstract: Isolated asymmetric bilateral steric conjugated polymers with thickness-independent emission for efficient and stable light-emitting optoelectronic devices

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Supplementary files

Article information


Submitted
11 Dec 2019
Accepted
03 Mar 2020
First published
04 Mar 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

Isolated asymmetric bilateral steric conjugated polymers with thickness-independent emission for efficient and stable light-emitting optoelectronic devices

N. Sun, Y. Liu, L. Sun, Y. Han, X. An, M. Xu, C. Sun, J. Lin, L. Bai, B. Li, C. Wei, C. Yin, M. Yu, Q. Wei, X. Ding, Z. Lin, Y. Liu, D. Guo, X. Zhang, L. Xie and W. Huang, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/C9TC06768J

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