Novel blue anthracene emitters based on improved rigidity of the phenanthro-oxazole side group

We designed and synthesized two new blue materials, namely 9,10-bis(4-(4,5-diphenyloxazol-2-yl)phenyl)anthracene (DPO-An) and 9,10-bis(4-(phenanthro[9,10-d]oxazol-2-yl)phenyl)anthracene (PO-An). Both DPO-An and PO-An materials show maximum photoluminescence wavelengths of 443 nm and 449 nm, respectively. These materials emit deep-blue light with high PLQY values of 80% and 82% in the solution state. Additionally, these two materials exhibit remarkable thermal stability, with decomposition temperatures exceeding 440 °C. In non-doped devices using DPO-An and PO-An as the emitting layer, electroluminescence peaks at 455 nm and 468 nm were observed, with Commission Internationale de L’Eclairage coordinates of (0.17, 0.24) and (0.18, 0.26), respectively.