Organic electroluminescent device with improved moisture protection
View Patent ↗An organic EL device is disclosed that prevents degradation due to moisture and oxygen and that avoids the generation of dark spots even when a substrate covered with polymer or made of a resin is used. The organic EL device includes a substrate, a transparent electrode consisting of a plurality of electrode elements formed on the substrate, an organic EL layer formed on the transparent electrode, and a reflection electrode formed on the organic EL layer. The transparent electrode includes first and second transparent electrode elements. Each of the first transparent electrode elements is arranged alternately with each of the second transparent electrode elements. A side edge portion of each of the first transparent electrode elements overlaps a side edge portion of next second transparent electrode element through an insulation layer. The first transparent electrode elements are electrically insulated from the second transparent electrode elements.
1. An organic EL device comprising:
a substrate,
a transparent electrode formed on the substrate,
an organic EL layer formed on the transparent electrode, and
a reflection electrode formed on the organic EL layer,
wherein the transparent electrode comprises first transparent electrode elements and second transparent electrode elements, each of the first transparent electrode elements being arranged alternately with each of the second transparent electrode elements, a side edge portion of each of the first transparent electrode elements overlapping a side edge portion of next second transparent electrode element through an insulation layer, and the first transparent electrode elements being electrically insulated from the second transparent electrode elements, each of the first transparent electrode elements and the second transparent electrode elements being in contact with the organic EL layer.
2. An organic EL device comprising:
a substrate,
a transparent electrode formed on the substrate,
an organic EL layer formed on the transparent electrode, and
a reflection electrode formed on the organic EL layer,
wherein the transparent electrode comprises first transparent electrode elements and second transparent electrode elements, each of the first transparent electrode elements being arranged alternately with each of the second transparent electrode elements, a side edge portion of each of the first transparent electrode elements overlapping a side edge portion of next second transparent electrode element through an insulation layer, and the first transparent electrode elements being electrically insulated from the second transparent electrode elements, further comprising second insulation films each covering the side edge portion of each of the second transparent electrode elements.
3. The organic EL device according to claim 2 , wherein the second insulation films are formed of a material selected from the group consisting of an organic resin, an insulative inorganic oxide, an insulative inorganic nitride, and an insulative inorganic oxide nitride.
4. An organic EL device comprising:
a substrate,
a transparent electrode formed on the substrate,
an organic EL layer formed on the transparent electrode, and
a reflection electrode formed on the organic EL layer,
wherein the transparent electrode comprises first transparent electrode elements and second transparent electrode elements, each of the first transparent electrode elements being arranged alternately with each of the second transparent electrode elements, a side edge portion of each of the first transparent electrode elements overlapping a side edge portion of next second transparent electrode element through an insulation layer, and the first transparent electrode elements being electrically insulated from the second transparent electrode elements, each of the first transparent electrode elements and the second transparent electrode elements being in contact with the organic EL layer, wherein the first transparent electrode elements are covered with the insulation layer only on an edge portion thereof.
5. The organic EL device according to claim 4 , wherein the first transparent electrode elements and the second transparent electrode elements are formed of a material selected from the group consisting of SnO 2 ,In 2 O 3 , ITO, IZO, and ZnO:Al.
6. The organic EL device according to claim 4 , wherein the substrate is selected from the group consisting of a transparent substrate, a transparent substrate covered with an organic resin, a transparent substrate provided with one or more color modulation parts, and a transparent substrate provided with one or more color modulation parts and covered with an organic resin.
7. The organic EL device according to claim 4 , further comprising a substrate passivation layer between the substrate and the transparent electrode, the substrate passivation layer being formed of a material selected from the group consisting of an insulative inorganic oxide, an insulative inorganic nitride, and an insulative inorganic oxide nitride.
8. The organic EL device according to claim 6 , wherein the transparent substrate is selected from the group consisting of a glass substrate, a resin substrate, and a flexible film, the resin substrate and the flexible film being formed of a material selected from a polyester resin including poly(ethylene terephthalate), acrylic resin including poly(methyl methacrylate), polyolefin, polycarbonate resin, and polyimide resin.
9. The organic EL device according to claim 7 , wherein the insulative inorganic oxide, the insulative inorganic nitride, and the insulative inorganic oxide nitride include SiO x , SiN x , SiN x O y , AIO x , TiO x , TaO x , or ZnO x .
10. An organic EL device comprising:
a substrate,
a transparent electrode formed on the substrate,
an organic EL layer formed on the transparent electrode, and
a reflection electrode formed on the organic EL layer,
wherein the transparent electrode comprises first transparent electrode elements and second transparent electrode elements, each of the first transparent electrode elements being arranged alternately with each of the second transparent electrode elements, a side edge portion, which faces a line perpendicular to the surface of the substrate, of each of the first transparent electrode elements overlapping a side edge portion, which faces a line perpendicular to the surface of the substrate, of next second transparent electrode element through an insulation layer, and the first transparent electrode elements being electrically insulated from the second transparent electrode elements.
11. An organic EL device comprising:
a substrate,
a transparent electrode formed on the substrate,
an organic EL layer formed on the transparent electrode, and
a reflection electrode formed on the organic EL layer,
wherein the transparent electrode comprises first transparent electrode elements and second transparent electrode elements, each of the first transparent electrode elements being arranged alternately with each of the second transparent electrode elements to form a moisture barrier over the entire substrate, with a side edge portion of each of the first transparent electrode elements overlapping a side edge portion of next second transparent electrode element through an insulation layer which electrically insulates the first transparent electrode elements from the second transparent electrode elements.