A device comprising: an organic light emitting device having a first electrode , a second electrode , and a light emitting layer disposed between the first and second electrodes; an air interface ; a first planarization layer disposed between the air interface and the organic light emitting device, the first planarization layer having an index of refraction of at least 1.6; and a first barrier layer disposed between the first planarization layer and the organic light emitting device, the first barrier layer having an index of refraction of at least 1.6; wherein the planarization layer planarizes a non-planar surface of a layer of the device; and wherein the planarization layer planarizes the surface of an internal light extraction layer comprising topographical features , wherein the planarization layer is placed on top of the internal light extraction layer , and wherein the internal light extraction layer is built on top of a substrate being adjacent to the air interface , wherein the topographical features have a size larger than a wavelength of light emitted by the organic light emitting device , and wherein the topographical features are configured for disrupting, through refraction, a light propagation of said light emitted by the organic light emitting device , wherein the internal light extraction layer has a lower index of refraction than the first planarization layer, characterized in that at least one additional planarizing and/or inorganic barrier layer is provided between the first planarization layer and the internal light extraction layer so that the refractive index is gradually stepped down from the first planarization layer to the internal light extraction layer. an organic light emitting device having a first electrode , a second electrode , and a light emitting layer disposed between the first and second electrodes; an air interface ; a first planarization layer disposed between the air interface and the organic light emitting device, the first planarization layer having an index of refraction of at least 1.6; and a first barrier layer disposed between the first planarization layer and the organic light emitting device, the first barrier layer having an index of refraction of at least 1.6; wherein the planarization layer planarizes a non-planar surface of a layer of the device; and wherein the planarization layer planarizes the surface of an internal light extraction layer comprising topographical features , wherein the planarization layer is placed on top of the internal light extraction layer , and wherein the internal light extraction layer is built on top of a substrate being adjacent to the air interface , wherein the topographical features have a size larger than a wavelength of light emitted by the organic light emitting device , and wherein the topographical features are configured for disrupting, through refraction, a light propagation of said light emitted by the organic light emitting device , wherein the internal light extraction layer has a lower index of refraction than the first planarization layer, characterized in that at least one additional planarizing and/or inorganic barrier layer is provided between the first planarization layer and the internal light extraction layer so that the refractive index is gradually stepped down from the first planarization layer to the internal light extraction layer. <EOS>