Patent ID: 11925042
Assignee: BOE TECHNOLOGY GROUP CO., LTD.
Field: nan (nan)
Classification: CPC H | IPC H

Claim 0:
1. An organic electroluminescent device comprising an anode, a hole transport layer (HTL), an electron blocking layer (EBL), an emission layer (EML), a hole blocking layer (HBL), an electron transport layer (ETL), and a cathode, wherein the emission layer contains at least one phosphorescent guest compound and at least two host materials, wherein the host materials are an N-type material and a P-type material, respectively, wherein the weight ratio of the N-type material to the P-type material P:N is from 1:5 to 5:1, and wherein:

0.02 eV≤HOMO(HTL)−HOMO(EML)≤0.65 eV.