Light-emitting layer and light-emitting element

摘要

To provide a highly efficient organic light-emitting element. An extremely thin layer (a monomolecular film or the like) containing an organic light-emitting material such as an iridium complex is provided between a layer of an n-type organic material (an organic material having a high electron-transport property) and a layer of a p-type organic material (an organic material having a high hole-transport property). In a structure described above, in a layer of the organic light-emitting material, electrons are injected from the LUMO of the n-type organic material to the LUMO of the organic light-emitting material, and holes are injected from the HOMO of the p-type organic material to the HOMO of the organic light-emitting material, whereby the organic light-emitting material is brought into an excited state and emits light.

主权项

1. An organic light-emitting layer comprising:
a layer of an n-type organic material; a layer of a p-type organic material; and a monomolecular film consisting of an organic metal complex containing iridium, wherein the monomolecular film is interposed between the layer of the n-type organic material and the layer of the p-type organic material, wherein the difference between the lowest unoccupied molecular orbit level of the n-type organic material and the lowest unoccupied molecular orbit level of the organic light-emitting material is less than 0.5 eV, and wherein the difference between the highest occupied molecular orbit level of the p-type organic material and the highest occupied molecular orbit level of the organic light-emitting material is less than 0.5 eV.