Patent ID: 9461253
Filing Date: 2016-10-04
CPC Classification: H01L

Claim Text:
1. An organic EL device comprising a pair of electrodes and a luminescent layer between the pair of electrodes, the luminescent layer comprising at least two phosphorescent materials, an electrically inert material, and a charge-transporting material, wherein the at least two phosphorescent materials are selected from the group consisting of a blue phosphorescent material having a luminescence peak in a range of from 420 nm to less than 500 nm, a green phosphorescent material having a luminescence peak in a range of from 500 nm to less than 570 nm, and a red phosphorescent material having a luminescence peak in a range of from 570 nm to 650 nm, wherein the at least two phosphorescent materials, the electrically inert material, and the charge-transporting material are co-deposited and have substantially uniform concentrations in the luminescent layer; and wherein the ratio of minimum luminescence spectrum to maximum luminescence spectrum of the at least two phosphorescent materials emitted from the device is within the range of from 5:95 to 50:50.