Benzopyran light-emitting auxiliary material, preparation method thereof and organic electroluminescent device

The invention discloses a benzopyran light-emitting auxiliary material, a preparation method thereof and an organic electroluminescent device, and belongs to the technical field of chemical and light-emitting materials. The structural general formula of the light-emitting auxiliary material is as follows: in the formula, m and n are respectively and independently natural numbers not greater than 4, and m and n are not 0 at the same time; each of L1 and L2 independently represents at least one of a linking bond, a substituted or unsubstituted C6-C30 arylene group, and a substituted or unsubstituted 3-30 membered heteroarylene group. According to the benzopyran light-emitting auxiliary material provided by the embodiment of the invention, an amine unit on the complex has relatively low ionization potential, relatively good electron donating property and relatively high hole mobility; meanwhile, the symmetry of molecules is reduced, and conformational isomers of the molecules are increased. When the light-emitti