EXTENDED OLED OPERATIONAL LIFETIME THROUGH PHOSPHORESCENT DOPANT PROFILE MANAGEMENT

摘要

This disclosure relates, at least in part, an organic light emitting device, which in some embodiments comprises an anode; a cathode; a first emissive layer disposed between the anode and the cathode, the first emissive layer comprising an electron transporting compound and a phosphorescent emissive dopant compound; and wherein the phosphorescent emissive dopant compound has a concentration gradient, in the emissive layer, which varies from the cathode side of the first emissive layer to the anode side of the emissive layer.

主权项

1. An organic light emitting device comprising:
an anode; a cathode; a first emissive layer disposed between the anode and the cathode, the first emissive layer comprising an electron transporting compound and a phosphorescent emissive dopant compound;
and wherein the phosphorescent emissive dopant compound has a concentration gradient, in the emissive layer, wherein the concentration gradient varies according to one or more of the following: (i) linearly towards the cathode side of the first emissive layer; (ii) non-linearly towards the cathode side of the first emissive layer, wherein said non-linearity corresponds to a polynomial function selected from the group consisting of a quadratic function, a cubic function, or a higher order function; and (iii) a step wise form.