Achieving phthalide-based fluorescent materials with hybridized local and charge-transfer characteristics for efficient deep blue OLEDs

Three blue emitters, PPT , PPPT and PAPT with D–A/D–π–A architectures have been developed, in which phthalide was first adopted as a functional acceptor. The device based on PAPT exhibited maximum EQE of 10.2% and FWHM of 53 nm.