Organic LED element, translucent substrate, and method for manufacturing organic LED element
View Patent ↗The present invention provides an organic LED element having the significantly larger light emission area than conventional ones. The invention relates to an organic LED element, comprising: a transparent substrate; a light scattering layer; a transparent first electrode; an organic light-emitting layer; and a second electrode formed in this order, wherein the light scattering layer has a base material comprising a glass, and a plurality of scattering materials dispersed in the base material; the light scattering layer has side surfaces, and each of the side surfaces has a surface tilted at an angle larger than right angle from an upper surface on the first electrode side toward a bottom surface on the transparent substrate side; and the first electrode is placed so as to continuously cover the side surfaces.
1. An organic LED element, comprising a transparent substrate, a light scattering layer, a first electrode, an organic light-emitting layer, a second electrode and a sealing substrate, wherein
the transparent substrate has a first region, a second region and a third region above an upper surface thereof, the second region is adjacent to the first region, and the first region is adjacent to the third region,
the light scattering layer has a base material comprising a glass, and a plurality of scattering materials dispersed in the base material and is placed on the transparent substrate over the first region, the second region and the third region,
the first electrode is placed on the light scattering layer so as to extend over the first region and the second region,
the organic light-emitting layer is placed in the first region above the upper surface of the transparent substrate so as to come into contact with the first electrode and the light scattering layer,
the second electrode is placed so as to extend over the first region and the third region so that the second electrode comes into contact with at least a part of the organic light-emitting layer and a part of the light scattering layer, and
the sealing substrate is placed in the first region so as to cover the portion of the second electrode placed in the first region,
wherein the organic LED element further comprises a first electrode terminal and a second electrode terminal, wherein
the first electrode terminal is constituted by a first barrier layer placed on the transparent substrate and a first conductive layer placed on the first barrier layer and electrically connected to the first electrode, and
the second electrode terminal is constituted by a second barrier layer placed on the transparent substrate and a second conductive layer placed on the second barrier layer and electrically connected to the second electrode
and wherein the first barrier layer is constituted by the light scattering layer and/or the second barrier layer is constituted by the light scattering layer.
2. The organic LED element according to claim 1 , wherein the first conductive layer is constituted by the same material as that of the first electrode and/or the second conductive layer is constituted by the same material as that of the first electrode.
3. The organic LED element according to claim 1 , wherein the scattering material is an air bubble and/or a precipitated crystal of the glass constituting the base material.
4. The organic LED element according to claim 1 , wherein a content of the scattering material in the light scattering layer is 1 vol % or more.
5. The organic LED element according to claim 1 , wherein the first electrode has a thickness ranging from 50 nm to 1.0 μm.
6. The organic LED element according to claim 1 , wherein the light scattering layer has a thickness ranging from 5 μm to 50 μm.
7. The organic LED element according to claim 1 , wherein the light scattering layer is extended over the outside of the sealing substrate.