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.