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Improved circularly polarized electroluminescence achieved using self-assembled aggregation-induced emission active chiral polymer dots

Authors: Jiang Zhenhao; He Jiaqi; Li Dong; Wang Pengxiang; Zhang Yu; Zhang Junsheng; Cheng Yixiang

DOI: 10.1007/s40843-025-3650-6Status: Verified Translated Edition
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Key Findings in This Report

• • The synthesized chiral polymer enantiomers R/S-PFC, after annealing at 110 °C and self-assembly in chloroform/n-hexane (9:1 v/v), yield AIE@CPdots with a luminescence dissymmetry factor |g_lum| = 4.4 × 10⁻³ at 462 nm, demonstrating effective chiral transfer and amplified CPL, which is critical for achieving high dissymmetry in solution-processed OLEDs. • • CP-OLEDs employing AIE@CPdots as the emission layer achieve an electroluminescence dissymmetry factor |g_EL| = 3.0 × 10⁻³ at 464 nm, a maximum luminance of 6022 cd m⁻², and a maximum current efficiency of 1.10 cd A⁻¹, indicating that self-assembled chiral dots can simultaneously provide decent circular polarization and practical brightness for display applications. • • The use of AIE-active cyanostyrene dye within the polymer backbone ensures aggregation-induced emission, which mitigates concentration quenching and maintains high photoluminescence quantum yields in the solid state, a key requirement for efficient OLED emissive layers. • • The self-assembly approach via solvent mixing and thermal annealing offers a scalable, low-cost route to fabricate chiral emissive nanomaterials, overcoming the low chiral transfer efficiency often seen in inorganic nanoparticle systems, and thus provides a viable pathway for industrial production of CP-OLEDs.