Patent ID: 8614698

Claim:
A light-emitting device of the organic light emitting diode (“OLED”) type including a plurality of optical cavities each forming a pixel of the light-emitting device and including at least one portion of at least one layer based on an electroluminescent organic material positioned between two electrodes, one of the electrodes is partly reflective and the other electrode is at least partly reflective, at least one of the two electrodes including at least one layer based on a material of refractive index n 1 including a structured face comprising a plurality of recesses filled with a material of refractive index n 2 different from n 1 , the light being intended to be emitted from the device through one of the partly reflective electrodes, wherein at least a first optical cavity of the plurality of optical cavities includes the plurality of recesses regularly distributed according to a first recurrent pattern and filled with the material of refractive index n 2 different from n 1 , wherein n 1 , n 2 , and a shape, dimensions and a period of the recesses of the first optical cavity are chosen so that a resonance frequency of the first optical cavity corresponds to a first given emission wavelength so as to obtain a filtering of the emission at said first given emission wavelength in the first optical cavity, and at least a second optical cavity of the plurality of optical cavities includes the plurality of recesses regularly distributed according to a second recurrent pattern and filled with the material of refractive index n 2 different from n 1 , wherein n 1 , n 2 and a shape, dimensions and a period of the recesses of the second optical cavity are chosen so that a resonance frequency of the second optical cavity corresponds to a second given emission wavelength so as to obtain a filtering of the emission at said second given emission wavelength in the second optical cavity, wherein the first given emission wavelength is different from the second given emission wavelength, and wherein, for each optical cavity, the dimensions and period of the recesses of said each optical cavity are smaller than the given emission wavelength associated to said each optical cavity in order to obtain said filtering.