The present invention discloses a near-
infrared II region
iridium complex with aggregation-induced
luminescence properties, a preparation method thereof, and an application thereof, wherein the
structural formula is as follows: wherein R1 is selected from one of S and Se, R2 and R3 are independently selected from one of H and, and R4 is selected from one of H and F. The present invention designs a D-A-D type N^N ligand and an
iridium complex thereof with dipyrido[3,2-a:2',3'-c][1,2,5]thiadiazolo[3,4-i]
phenazine as an
acceptor (A) and
triphenylamine as a donor (D). The large conjugated rigid
acceptor and the D-A-D structure can ensure that the molecule has a lower energy gap, so that it has near-
infrared II region (NIR-II) emission, and the
propeller-type
triphenylamine and the ortho-
alkyl-substituted
thiophene π-bridge can effectively suppress the aggregation of the molecule, so that it has aggregation-induced
luminescence properties. At the same time, the
electron-withdrawing
iridium ion coordination further improves the
electron-withdrawing ability of the
acceptor, and the absorption and emission of the entire molecule are red-shifted.