| abstract |
The present invention provides an organic electroluminescent device with a double-host structure, which comprises a hole transport region, an electron transport region and a light-emitting layer, the light-emitting layer comprises a first host material and a second host material, and the first The mass ratio of host material:second host material is 1:99‑99:1. In the organic electroluminescent device with a double-host structure provided by the present invention, the triplet excitons can be dispersed on the two hosts by using a double-host material, thereby reducing TTA and reducing the efficiency roll-off of the organic electroluminescent device, so that The efficiency and lifetime of organic electroluminescent devices have been greatly improved. |