Substrate for organic electronic device
Provided are a substrate for an organic electronic device (OED), an organic electronic system, a method of manufacturing the substrate or the system, and lighting. The substrate for an OED may be increased in durability by preventing penetration of an external material such as moisture or oxygen, and thus an organic electronic system having excellent light extraction efficiency may be formed. In addition, since the substrate may be stably attached to an encapsulating structure sealing the organic electronic system, the device may have excellent durability with respect to abrasion of an electrode layer or pressure applied from an external environment. In addition, a surface hardness of an external terminal of the organic electronic system may be maintained at a suitable level.
1. A substrate for an organic electronic device, comprising:
a base layer;
an optical functional layer that is formed on the base layer and that has a smaller projected area than the base layer; and
an electrode layer that has a larger projected area than the optical functional layer and that is formed on both of the optical functional layer and the base layer on which the optical functional layer is not formed,
wherein a pencil hardness measured with a pencil weight of 500 g at a pencil movement speed of 250 mm/min according to ASTM D3363 of the electrode layer on the base layer on which the optical functional layer is not formed is 6H or more.
2. The substrate according to claim 1 , wherein a pencil hardness measured with a pencil weight of 500 g at a pencil movement speed of 250 mm/min according to ASTM D3363 of the electrode layer on the base layer on which the optical functional layer is not formed is from 2B to 5H.
3. The substrate according to claim 1 , wherein a ratio (A/B) of a projected area (A) of the electrode layer relative to a projected area (B) of the optical functional layer is 1.04 or more.
4. The substrate according to claim 1 , wherein the optical functional layer is encapsulated by the base layer, the electrode layer and a conductive material.
5. The substrate according to claim 1 , wherein the base layer is transparent.
6. The substrate according to claim 1 , wherein the base layer is a glass base layer.
7. The substrate according to claim 1 , wherein the electrode layer is a hole injection electrode layer or an electron injection electrode layer.
8. The substrate according to claim 1 , wherein the optical functional layer is a light scattering layer.
9. The substrate according to claim 8 , wherein the light scattering layer comprises a matrix material and scattering particles having a different refractive index from the matrix material.
10. The substrate according to claim 9 , wherein the matrix material comprises polysiloxane, poly(amic acid) or polyimide.
11. The substrate according to claim 9 , wherein the scattering particles have a refractive index of 1.0 to 3.5.
12. The substrate according to claim 8 , wherein the light scattering layer is a layer having an uneven structure.
13. The substrate according to claim 1 , wherein the optical functional layer comprises a light scattering layer and a planarized layer formed on the light scattering layer.
14. The substrate according to claim 13 , wherein the planarized layer has a refractive index of 1.7 or more.
15. An organic electronic system, comprising:
the substrate of claim 1 ;
an organic layer that comprises an emitting layer and that is formed on the electrode layer of the substrate; and
a second electrode layer formed on the organic layer.
16. The system according to claim 15 , wherein a difference (B−C) between a length (B) of a region of the substrate in which the optical functional layer is formed and a length (C) of the emitting region of the emitting layer is from 10 μm to 2 mm.
17. The system according to claim 15 , further comprising an encapsulating structure for protecting the organic layer and the second electrode layer, which is attached to the top surface of the electrode layer of the substrate, below which the optical functional layer is not formed.
18. The system according to claim 17 , wherein the encapsulating structure is a glass can or a metal can.
19. The system according to claim 17 , wherein the encapsulating structure is a film covering entire surfaces of the organic layer and the second electrode layer.
20. Lighting comprising the organic electronic system of claim 14 .