Highly fluorescent anthracene derivative as a non-fullerene acceptor in OSCs with small non-radiative energy loss of 0.22 eV and high PCEs of over 13%†
Herein, we designed and synthesized a highly fluorescent non-fullerene acceptor (ANT-4F) based on an anthracene (ANT) core. OSCs based on ANT-4F/PBDB-TF exhibited a significantly decreased Vloss,non-rad of 0.22 V (calculated from high EQEEL = 1.7 × 10−4). Simultaneously, high charge-transfer state energy (ECT = 1.54 eV) was obtained. Compared with OSCs based on IT-4F/PBDB-TF, a reduced Vloss,non-rad and higher ECT concurrently contributed to an increased Voc of 0.93 V. Consequently, despite the lower Jsc of 19.0 mA cm−2, an overall high PCE of 13.1% can be obtained. This work exemplified the great potential for highly fluorescent NFSAs in decreasing Vloss,non-rad and improving PCEs.