Controlling chain behavior through smart molecular design provides the potential to develop ultrastable and efficient deep?blue light?emitting conjugated polymers (LCPs). Herein, a novel supramolecular self?encapsulation strategy is proposed to construct a robust ultrastable conjugated polydiarylfluorene (PHDPF?Cz) via precisely preventing excitons from interchain cross?transfer/coupling and contamination from external trace H2O/O2. PHDPF?Cz consists of a mainchain backbone where the diphenyl groups localize at the 9?position as steric bulk moieties, and carbazole (Cz) units localize at the 4?position as supramolecular ??stacked synthon with the dual functionalities of self?assembly capability and hole?transport facility. The synergistic effect of the steric bulk groups and ??stacked carbazoles affords PHDPF?Cz as an ultrastable property, including spectral, morphological stability, and storage stability. In addition, PHDPF?Cz spin?coated gelation films also show thickness?insensitive deep?blue emission with respect to the reference polymers, which are suitable to construct solution?processed large?scale optoelectronic devices with higher reproducibility. High?quality and uniform deep?blue emission is observed in large?area solution?processed films. The electroluminescence shows high?quality deep?blue intrachain emission with a CIE (0.16, 0.12) and a very narrow full width at half?maximum of 32 nm. Finally, large?area and flexible polymer light?emitting devices with a single?molecular excitonic behavior are also fabricated. The supramolecular self?encapsulation design provides an effective strategy to construct ultrastable LCPs for optoelectronic applications.

» Author: Jinyi Lin, Bin Liu, Mengna Yu, Xuhua Wang, Zongqiong Lin, Xinwen Zhang, Chen Sun, Juan Cabanillas?Gonzalez, Linghai Xie, Feng Liu, Changjin Ou, Lubing Bai, Yamin Han, Man Xu, Wensai Zhu, Trevor A. Smith, Paul N. Stavrinou, Donal D. C. Br

» Reference: doi:10.1002/adma.201804811

» Publication Date: 29/10/2018

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