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journal article·2025-12Open access

Self‐encapsulated light‐emitting conjugated polymers with enhanced spectra aging stability for deep‐blue polymer light‐emitting diodes

Yamin Han, Rui Gao, Qingqing Lu, Lubing Bai, Wenyu Chen, Ning Sun, Chuanxin Wei, Xiang An, Lili Sun, Chen Sun, Bin Liu, Jinyi Lin, Wei Huang

InfoMat· Volume 7· Issue 12
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Abstract

Abstract 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. image
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Research context

PolymersElectronic materials

OpenAlex topics: Organic Electronics and Photovoltaics · Organic Light-Emitting Diodes Research · Luminescence and Fluorescent Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

State Key Laboratory of Flexible Electronics (LOFE) School of Flexible Electronics (Future Technologies) & Institute of Advanced Materials (IAM), Nanjing Tech University (NanjingTech) Nanjing The People's Republic of China

School of Flexible Electronics (SoFE) & State Key Laboratory of Optoelectronic Materials and Technologies Sun Yat‐sen University Shenzhen The People's Republic of China

Dongguan Key Laboratory of Micro‐Nano Optical Field Manipulation and Sensing School of Physical Sciences, Great Bay University Dongguan The People's Republic of China

Frontiers Science Center for Flexible Electronics & Institute of Flexible Electronics (IFE) Northwestern Polytechnical University (NPU) Xi'an The People's Republic of China

Key Laboratory for Organic Electronics and Information Displays & Institute of Advanced Materials (IAM) Nanjing University of Posts & Telecommunications Nanjing The People's Republic of China

Funding

National Natural Science Foundation of China · China Postdoctoral Science Foundation

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