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 formed on the transparent substrate; a transparent first electrode formed on the light scattering layer; an organic light-emitting layer formed on the first electrode; and a second electrode formed on the organic light-emitting layer, 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 a bottom surface on the transparent substrate side, an upper surface on the first electrode side and side surfaces, and each of the side surfaces of the light scattering layer has a surface tilted at an angle larger than right angle from the upper surface toward the bottom surface, and
the first electrode is placed so as to continuously cover the side surfaces of the light scattering layer.
2. The organic LED element according to claim 1 , further comprising 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.
3. The organic LED element according to claim 2 , 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.
4. The organic LED element according to claim 2 , 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.
5. 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.
6. 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.
7. The organic LED element according to claim 1 , wherein the first electrode has a thickness ranging from 50 nm to 1.0 μm.
8. The organic LED element according to claim 1 , wherein the light scattering layer has a thickness ranging from 5 μm to 50 μm.
9. A translucent substrate, comprising: a transparent substrate; a light scattering layer formed on the transparent substrate; and a transparent electrode formed on the light scattering layer, 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 a bottom surface on the transparent substrate side, an upper surface on the transparent electrode side and side surfaces, and each of the side surfaces of the light scattering layer has a surface tilted at an angle larger than right angle from the upper surface toward the bottom surface, and
the transparent electrode is placed so as to continuously cover the side surfaces of the light scattering layer.
10. The translucent substrate according to claim 9 , wherein the scattering material is an air bubble and/or a precipitated crystal of the glass constituting the base material.
11. A method for manufacturing an organic LED element comprising a transparent electrode, a light scattering layer, a first electrode, an organic light-emitting layer and a second electrode, the method comprising:
(a) a step of forming the light scattering layer on the transparent substrate,
wherein the light scattering layer has a base material comprising a glass, and a plurality of scattering materials dispersed in the base material; and the light scattering layer has a bottom surface on the transparent substrate side, an upper surface and side surfaces, and each of the side surfaces of the light scattering layer has a surface tilted at an angle larger than right angle from the upper surface toward the bottom surface,
(b) a step of placing the transparent first electrode on the light scattering layer,
wherein the first electrode is placed so as to continuously cover the side surfaces of the light scattering layer,
(c) a step of placing the organic light-emitting layer on the first electrode, and
(d) a step of placing the second electrode on the organic light-emitting layer.
12. The method for manufacturing an organic LED element according to claim 11 , wherein the step (a) comprises:
(a1) a step of placing a paste containing a glass powder on the transparent substrate, and
(a2) a step of firing the transparent substrate on which the paste has been placed in a temperature range of a softening temperature of the glass powder ±30° C., thereby forming the base material and a plurality of the scattering materials dispersed in the base material.