Substrate for organic light-emitting device, and also organic light-emitting device incorporating it

An organic light-emitting device comprising:

• a substrate having an index n0 and bearing a first electrode that comprises:
• an anti-reflection sublayer having a first optical thickness and having an optical index n1 such that the ratio of n1 to n0 is greater than or equal to 6/5;
• a first metallic layer having a second thickness, positioned on the anti-reflection sublayer;
• a first separating layer, having a fourth optical thickness, positioned on the first metallic layer and beneath an overlayer, the overlayer for adapting a work function of the electrode and comprising a metal oxide or a metal, having a third thickness, positioned on the first metallic layer, wherein the overlayer is the last layer of the electrode;
• a second metallic layer, having an intrinsic electrical conductivity property, and having a fifth thickness, said second layer being positioned between the first separating layer and the overlayer;
• the sum of the second and fifth thicknesses of the first and second metallic layers being less than or equal to 40 nm;
• an OLED system positioned over the first electrode and that is configured to emit a polychromatic radiation defined at 0° by coordinates (x1, y1) in a CIE XYZ 1931 chromaticity diagram, and
• a second electrode, wherein the OLED system is between the first and second electrodes,
• wherein the first and fourth optical thicknesses are adjusted so that a first microcavity is formed between the first metallic layer and the second electrode and a second microcavity is formed between the second metallic layer and the second electrode, which first and second microcavities resonate at two different wavelengths in the visible region that are spaced apart by at least about 100 nm to broaden the resonance peaks and form a broadband spectrum in the visible region.