Patent ID: 7045954

Claim:
An organic light-emitting device, comprising: (a) a light-transmissive substrate; (b) a light-transmissive anode disposed over the substrate; (c) an organic light-emitting structure disposed over the anode; (d) a semi-transparent cathode disposed over the light-emitting structure and which is formed of a metal which has a work function below 4.0 eV and a refractive index equal to or greater than 1 at the wavelengths of 400–700 nm; (e) a multilayer structure disposed over the cathode comprising a phase-changing layer formed over the cathode and a reflective metallic layer formed over the phase-changing layer, wherein the multilayer structure substantially reduces reflection of ambient light and substantially reduces reflection of light emitted by the organic light emitting structure by causing reflected beams within the device to destructively interfere with one another.