Organic Single Crystals with High Photoluminescence Quantum Yields Close to 100% and High Mobility for Optoelectronic Devices
Jingwei Tao, Dan Liu, Jiangbo Jing, Huanli Dong, Leijing Liu, Bin Xu, Wenjing Tian
Abstract
Abstract 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.