The syntheses of the three target emitters are shown in Scheme 1. The key acceptor intermediate 2 was prepared in two steps with an overall yield of 85%, involving the reaction of 2,3-dichloro-1,4-naphthoquinone with potassium phthalide to furnish 1, which was then subjected to hydrazine hydrate (Scheme S1). Precursors 3 and 4 are prepared by Buchwald-Hartwig cross-coupling reaction of 4,4′-dibromobenzil with di-p-tolylamine and bis(4-(tert-butyl)phenyl)amine in 60 and 74% yields, respectively. A Suzuki-Miyaura cross-coupling reaction between 4,4′-dibromobenzil and triphenylamine-4-boronic acid afforded 5 in 81% yield. Target emitters MeTPA-BQ, tBuTPA-BQ and TPPA-BQ were prepared from the condensation of 2 with precursors 3, 4 and 5, respectively, in good yields. The identity and purity of the compounds are confirmed by NMR ( 1 H and 13 C), high-resolution mass spectrometry (HRMS) and high-pressure liquid chromatography (HPLC) and elemental analysis (Figures ).