| abstract |
The present application relates to an azadiimide compound having a structure of formula (I); each of X 1 , X 2 , X 3 and X 4 is a carbon atom or a nitrogen atom, and at least one of them is a nitrogen atom; L is Linking group, D is an electron donor; m and n are the number of linking group L and electron donor D, m is 0, 1 or 2, n is 1 or 2; R is preferably selected from substituted or unsubstituted C6-C40 Aryl, or substituted or unsubstituted C5-C40 heteroaryl; L is preferably selected from substituted or unsubstituted C3-C20 heterocyclic group, substituted or unsubstituted C6-C40 aryl, or substituted or unsubstituted C5-C40 heteroaryl . The azadiimide compound of the present invention is used as a host material or a CPL layer material in an electroluminescent device, and has a higher triplet energy level ET and a larger molecular density, a higher glass transition temperature and a molecular heat Stability can effectively improve the balanced migration of carriers, broaden the exciton recombination domain, effectively improve the light extraction efficiency, and improve the luminous efficiency and life of the device. The invention also provides an organic light emitting display device. |