Long Exciton Diffusion Length in High Mobility Emissive Organic Semiconductor

Organic semiconductors that possess both long exciton diffusion length and high mobility emissive properties are crucial for the development of high-performance organic optoelectronic devices. However, materials with these combined characteristics are currently rare. Herein, a long exciton diffusion length was obtained in the high mobility emissive organic semiconductor trans-1,2-bis(5-phenyldithieno2,3-b:3′,2′-dthiophen-2-yl)ethene (BPTTE). Excellent optoelectronic properties with the maximum carrier mobility of 18.1 cm2 V–1 s–1 and high photoluminescence quantum yield (PLQY) of 21.4% were obtained for BPTTE single crystals. Notably, an impressive exciton diffusion length reaching up to 114.2 nm was also achieved, demonstrating the effective integration of optoelectrical properties in BPTTE single crystals. This work offers valuable guidance for exploring the multifunctional capabilities of high mobility organic semiconductors, a crucial aspect for enhancing the performance of organic optoelectronic devices.