Light-emitting body, light-emitting layer, and light-emitting device

摘要

An organic light-emitting element having high efficiency and long lifetime is provided. An organic light-emitting body is provided which includes a host having a high electron-transport property (n-type host), a host having a high hole-transport property (p-type host), and a guest such as an iridium complex and in which the n-type host and the p-type host are located so as to be adjacent to each other. When an electron and a hole are injected to such a light-emitting body, the electron is trapped by the n-type host and the hole is trapped by the p-type host. Then, both the electron and the hole are injected to the guest, and thus the guest is brought into an excited state. In this process, less thermal deactivation occurs and the working rate of the guest is high; thus, highly efficient light emission can be obtained.

主权项

1. An organic light-emitting device comprising:
a light-emitting layer comprising:
guest molecules including a first guest molecule that is an iridium complex;n-type host molecules including a first n-type host molecule including a heteroaromatic ring; andp-type host molecules including a first p-type host molecule including an aromatic amine, wherein the p-type host molecules and the n-type host molecules are mixed in the light-emitting layer, wherein the first n-type host molecule is adjacent to an end of a ligand of the first quest molecule, wherein the first p-type host molecule is adjacent to an iridium-benzene skeleton of the first guest molecule, wherein the first guest molecule is sandwiched between the first n-type host molecule that is next to the first guest molecule and the first p-type host molecule that is next to the first guest molecule, and wherein molecular orbitals of the first guest molecule, the first n-type host molecule and the first p-type host molecule are overlapped with each other so that the first guest molecule, the first n-type host molecule and the first p-type host molecule interact with each other.