An organic light-emitting device containing a host material, a delayed fluorescent material and a light-emitting material satisfying ES1(H)>ES1(F)>ES1(D) has a high light emission efficiency. ES1(H) represents a lowest excited singlet energy level of the host material, ES1(F) represents a lowest excited singlet energy level of the delayed fluorescent material, and ES1(D) represents a lowest excited singlet energy level of the light-emitting material.
一种含有宿主材料、延迟荧光材料和
发光材料的有机发光器件具有很高的光发射效率,该器件满足ES1(H)>ES1(F)>ES1(D)的要求。ES1(H)代表主材料的最低激发单线能级,ES1(F)代表延迟荧光材料的最低激发单线能级,ES1(D)代表
发光材料的最低激发单线能级。