Organic Single Crystals with High Photoluminescence Quantum Yields Close to 100% and High Mobility for Optoelectronic Devices

Organic single crystals with excellent optical and electrical properties are critical for the development of organic optoelectronics. Herein, two compounds 9,10‐bis([ N , N ‐diphenyl]‐4′‐phenylethynyl)anthracene (TPA‐An) and 9,10‐bis([1′,3′‐diphenyl]‐5′‐phenylethynyl)anthracene (TBA‐An) are synthesized by introducing two different luminescent groups, triphenylamine and 1,3‐diphenylbenzene, at the 9,10 positions of anthracene via triple bond connection. Single crystals based on TPA‐An and TBA‐An with a ribbon morphology obtained through the slow solvent‐evaporation method exhibit high photoluminescence quantum yields (PLQYs) of 98% and 99% at room temperature, and remarkable hole mobilities of 0.45 and 0.15 cm 2 V −1 s −1 in single‐crystal organic field‐effect transistors (SC‐OFETs). Furthermore, UV phototransistors based on the two single crystals obtain photosensitivities of 1.03 × 10 3 and 3.45 × 10 4 , ultrahigh photoresponsivities of 7.19 × 10 5 and 1.50 × 10 5 A W −1 , and the detectivities exceeding 1.40 × 10 16 and 1.60 × 10 17 Jones.