Substrate for organic electronic device
Provided are a substrate for an organic electronic device (OED) and a use thereof. The substrate may have excellent interfacial cohesive property by preventing interlayer delamination between the organic material layer and the inorganic material layer when being applied to manufacture a flexible device including a structure in which an organic material layer and an inorganic material layer are present together. In addition, when the substrate for an OED is used, an OED may have excellent durability and an excellent another required physical property such as light extraction efficiency.
1. A substrate for an organic electronic device (OED), comprising:
a base film including a condensation unit of an aromatic tetracarboxylic acid dianhydride and a diamine compound or an imidization unit thereof having two or more hydroxyl groups; and
an inorganic material layer disposed on the base film,
wherein the diamine compound is 1,3-diamino-4,6-dihydroxybenzene, and
wherein a surface of the base film has a contact angle in a range of 50 to 65 degrees with respect to deionized water at room temperature.
2. The substrate according to claim 1 , wherein the imidization unit includes 2 to 10 moles of a hydroxyl group.
3. The substrate according to claim 1 , wherein the base film includes a first unit which is a condensation unit of a first aromatic tetracarboxylic acid dianhydride and the diamine compound or an imidization unit thereof and a second unit in which a condensation unit of a second aromatic tetracarboxylic acid dianhydride and the diamine compound or an imidization unit thereof.
4. The substrate according to claim 3 , wherein the absolute value of the difference in refractive index between the first unit and the second unit is 0.01 or more.
5. The substrate according to claim 3 , wherein the absolute value of the difference between a mole number of polar functional groups included in the first unit and a mole number of polar functional groups included in the second unit is 2 or more.
6. The substrate according to claim 5 , wherein the polar functional group is a halogen atom, a haloalkyl group, a cyano group, a nitro group, an alkoxy group, a cyanate group or a thiocyanate group.
7. The substrate according to claim 3 , wherein the base film includes 3 to 30 parts by weight of the first unit with respect to 100 parts by weight of the second unit.
8. The substrate according to claim 1 , wherein the inorganic material layer is an atomic layer deposition (ALD) layer.
9. The substrate according to claim 1 , wherein the inorganic material layer has a refractive index for light having a wavelength of 550 nm of 1.7 or more.
10. The substrate according to claim 1 , wherein the inorganic material layer includes a stack structure of a first sub layer and a second sub layer.
11. The substrate according to claim 10 , wherein each of the first sub layer and the second sub layer has a thickness of 7 nm or less.
12. The substrate according to claim 11 , wherein the inorganic material layer does not include a layer having a thickness of more than 7 nm.
13. The substrate according to claim 10 , wherein the first sub layer and the second sub layer are metal oxide layers.
14. The substrate according to claim 10 , wherein the first sub layer has a refractive index of 1.4 to 1.9, and the second sub layer has a refractive index of 2.0 to 2.6.
15. An organic electronic device (OED), comprising:
the substrate for an OED of claim 1 ; and
a device region having a first electrode layer, an organic material layer, and a second electrode layer, which are present on an inorganic material layer of the substrate.
16. A light source for a display, comprising:
the OED of claim 15 .
17. A lighting device, comprising:
the OED of claim 15 .
18. The substrate according to claim 1 , wherein the base film has a root mean square value of surface roughness in a range of 0.1 to 5 nm.
19. The substrate according to claim 1 , further including a buffer layer between the inorganic material layer and the base film.
20. The substrate according to claim 1 , wherein the aromatic tetracarboxylic acid dianhydride is 3,3′,4,4′-biphenyltetracarboxylic dianhydride.