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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.

A rod covering a fixed span is loaded at the middle with a transverse force, such that with increasing load a progressive deflection occurs. After a certain initial deflection, a phenomenon is observed where two points of the rod come in contact with each other. This is defined as the 'dripping point' and is when 'self-encapsulation' of the elastic rod occurs. Dripping seems at a first glance to be impossible and definitely cannot occur in the presence of 'ordinary' constraints (such as simple supports or clamps) at the ends of the span. However, the elastica governs oscillating pendulums, buckling rods and pendant drops, so that a possibility for self-encapsulation might be imagined. This phenomenon is indeed demonstrated (both theoretically and experimentally) to occur when at least one of the constraints at the ends of the rod is a sliding sleeve. This mechanical device generates a configurational force, causing the dripping of the rod, in a fully elastic set-up.

Lamination technique is one of the most promising and effective approaches to produce flexible organic solar cells (OSCs), with the combination of high throughput and simultaneous encapsulation. In this study, flexible ITO‐free OSCs were successfully fabricated by lamination technique under the optimized temperature and pressure. It is found that the introduction of hole interface layer of PEDOT:MoO3 helps to improve both the film hydrophobicity and the carrier extraction. A high efficiency improvement of about 30% is obtained in the interface‐modified laminating flexible ITO‐free OSCs compared to the conventional laminated device. This work illustrates that anode interface engineering has a significant effect on the improvement of performance of roll‐to‐roll laminated and self‐encapsulated OSCs. Flexible ITO‐free organic solar cells were successfully fabricated and optimized with lamination technology. The PEDOT:MoO3 hole interfacial layer was introduced into the structure, increasing in the short circuit current and the power conversion efficiency of about 30%. PEDOT:MoO3 is found out to promote both the film hydrophobicity and the carrier extraction.