As shown in Scheme S1, the energy donor K-1 and K-2 were rationally designed and facilely synthesized. The carbazole (Cz) derivative 3 was prepared in 78% isolated yield from commercial 3,6-dibromo-9H-carbazole 1 and 4-fluoro-3-methylbenzonitrile 2. Next, carbazole derivative 4 was synthesized by Miyaura borylation. The triphenylamine (TPA) derivative 7 was synthesized from 4-methoxyaniline 5 and 1-Bromo-4iodobenzene 6 via Ullmann coupling reaction. As expected, K-2 was obtained by Suzuki coupling reaction of compound 4 and 7 using Pd(PPh3)4 as catalyst. Under the same conditions, the desired K-1 was afforded as a white solid by the reaction of K-2 and intermediate 4. All new compounds were characterized by 1 H NMR, C NMR and high resolution mass spectrometry (HRMS). The detailed synthetic procedures and characterization are presented in Scheme S1 and Figures S1-S12 in the Supporting Information.