Patent ID: 9634256
Date: 2017-04-25
CPC Classifications: H01L

Claim:
1. An OLED device comprising a cathode, an anode, and having therebetween a light emitting layer (LEL) comprising a phosphorescent emitting compound disposed in a host comprising a mixture of at least one electron transporting co-host represented by wherein: and at least one hole transporting co-host which is a triphenylamine containing only one nitrogen atom; wherein the phosphorescent emitting compound is: wherein there is present an electron transporting layer contiguous to the LEL on the cathode side and wherein there is present an electron-injection layer (EIL) containing a heteroaromatic compound contiguous to the cathode; wherein the electron transporting layer comprises an aromatic hydrocarbon material selected from: wherein the electron-injection layer comprises a heteroaromatic compound selected from: