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Self‐encapsulated light‐emitting conjugated polymers with enhanced spectra aging stability for deep‐blue polymer light‐emitting diodes
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Self‐encapsulated light‐emitting conjugated polymers with enhanced spectra aging stability for deep‐blue polymer light‐emitting diodes
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Journal Article
Self‐encapsulated light‐emitting conjugated polymers with enhanced spectra aging stability for deep‐blue polymer light‐emitting diodes
2025
Overview
Molecular‐level encapsulation of conjugated polymers serves as a potent approach to isolate the conjugated backbone for reducing intermolecular interactions and manipulating optoelectronic properties in solid state. Herein, by tuning the generation of dendritic carbazoles (Cz) in side chains, polydiarylfluorenes with efficient deep‐blue emission have been successfully synthesized and explored. The nonplanar twisted Cz dendrons endow their photoluminescence (PL) spectra with enhanced air‐aging stability and thermal stability owing to the formation of a self‐encapsulation layer. Their impact on solution‐state chain conformation and aggregation was thoroughly studied, combining small‐angle neutron scattering (SANS) and dynamic light scattering (DLS). Furthermore, benefiting from the suppressed intermolecular interactions, their films exhibit optimal behavior of singlet excitons in the excited state. Polymer light‐emitting diodes (PLEDs) adopting the spin‐coated and blade‐coated films both present comparable properties and stable electroluminescence (EL) spectra, with Commission Internationale de L'Eclairage (CIE) coordinates (x + y) < 0.3, demonstrating the feasibility of a self‐encapsulated molecular design strategy. Toward enhancing the spectral air‐aging stability of blue light‐emitting conjugated polymers in solution‐processed manufacturing, we proposed a design approach for molecular‐level encapsulation by introducing dendritic carbazoles (Cz) to the side chains. The unique nonplanar twisted Cz dendrons play critical roles in isolating conjugated backbones for reducing intermolecular interactions and manipulating their optoelectronic properties in the solid state.
Publisher
John Wiley & Sons, Inc,Wiley
