期刊
ADVANCED MATERIALS
卷 31, 期 1, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201804811
关键词
deep blue; flexible electroluminescent devices; polyfluorene; self-encapsulated strategy; ultrastable
类别
资金
- National Natural Science Foundation of China [61874053, 21504041, 21502091]
- National Key Basic Research Program of China (973) [2015CB932200]
- Natural Science Funds of the Education Committee of Jiangsu Province [18KJA430009]
- High-Level Talents in Six Industries of Jiangsu Province [XYDXX-019]
- Spanish Ministry of Economy and Competitiveness [MAT2014-57652-C2-1/2-R, PCIN-2015-169-C02-01/02]
- Spanish Ministry of Economy and Competitiveness through Severo Ochoa Programme for Centers of Excellence [SEV-2016-0686]
- Campus of International Excellence (CEI) UAM+CSIC
- China Scholarship Council [201608390023]
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/O-2. 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 pi-stacked synthon with the dual functionalities of self-assembly capability and hole-transport facility. The synergistic effect of the steric bulk groups and pi-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.
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