Patent ID: 9666826
Date: 2017-05-30
CPC Classifications: H01L

Claim:
1. An electroluminescent device comprising a cathode, an anode, and having therebetween a light emitting layer (LEL), the device further containing an electron transport layer (ETL) comprising an anthracene compound on the cathode side of the LEL, and an organic electron injection layer (EIL) between the ETL and the cathode, the EIL comprising a phenanthroline compound, wherein the thickness of the EIL and LEL are such that the ratio of the thickness of the EIL to LEL is greater than 0.15, but not greater than 0.75, wherein the ETL is disposed adjacent to the LEL, wherein the thickness of the ETL and LEL are such that the ratio of the thickness of the ETL to LEL is at least 0.625, but not greater than 1.63, and wherein the phenanthroline compound in the EIL is and wherein the anthracene compound in the ETL is