The invention relates to a nitrogen-doped diimide compound. The compound is provided with a structure as shown in Formula (I), wherein X<1>, X<2>, X<3> and X<4> are carbon or nitrogen atoms, and at least one is a nitrogen atom; L is a linker or linkers, and D is a donor or donors; m is the number of the linker(s) L, n is the number of the donor(s) D, m is 0, 1 or 2, and n is 1 or 2; R is preferredto be a substituted or unsubstituted C6-C40 aryl group, or a substituted or unsubstituted C5-C40 heteroaryl group; and L is preferred to be a substituted or unsubstituted C3-C20 heterocyclic group (groups), a substituted or unsubstituted C6-C40 aryl group (groups), or a substituted or unsubstituted C5-C40 heteroaryl group (groups). The nitrogen-doped diimide compound provided by the invention isused as a principal material or a CPL layer material of an electroluminescent device, achieves a higher triplet energy level E<T>, a larger molecular density, a higher glass transition temperature andhigher molecular heat stability, and can effectively improve balance migration of carriers, expand the exciton recombination domain, effectively improve the optical extraction efficiency, enhance thelight-emitting efficiency of the device, and prolong the service life of the device. The invention further provides an organic light-emitting display device.