An Amorphous Donor‐Acceptor Conjugated Polymer with Both High Charge Carrier Mobility and Luminescence Quantum Efficiency

Organic semiconducting polymers play a pivotal role in the development of field‐effect transistors (OFETs) and organic light‐emitting diodes (OLEDs), owing to their cost‐effectiveness, structural versatility, and solution processability. However, achieving polymers with both high charge carrier mobility (μ) and photoluminescence (PL) quantum yield (Φ) remains a challenge. In this work, we present the design and synthesis of a novel donor‐acceptor π‐conjugated polymer, TTIF‐BT, featuring a di‐Thioeno[3,2‐b] ThioenoIndeno[1,2‐b] Fluorene (TTIF) backbone as the donor component. TTIF‐BT exhibits comparable hole mobility and enhanced interchain‐mediated emissions compared to state‐of‐the‐art semiconducting IDT‐BT, leading to a remarkable Φ·μ value of ~0.084 cm2 V–1 s–1. Through time‐resolved absorption and PL techniques, we propose a model to extract the spectral weight of interchain‐mediated emissions, yielding 62% in TTIF‐BT. Our results introduce a high‐performance semiconducting polymer, which has potential use in next‐generation organic optoelectronic devices, including electrically‐driven polymer lasers and active‐matrix display technologies.