Substrate for an organic light-emitting device and method for manufacturing the same
Provided is a substrate for an organic light emitting diode including a base substrate, a high refractive scattering layer formed on the base substrate, and having a scattering particle scattering light in a high refractive material, and an adhesive layer formed between the base substrate and the high refractive scattering layer to laminate the base substrate with the high refractive scattering layer, wherein the high refractive scattering layer has a structure in which the scattering particle is immersed in the high refractive material, an average thickness of the high refractive scattering layer is smaller than an average diameter of the scattering particle, a surface of the high refractive scattering layer laminated with the base substrate by the adhesive layer has unevenness formed by the scattering particle, the opposite surface of the high refractive scattering layer laminated with the base substrate by the adhesive layer has a planarized surface, and a method for manufacturing the same. The substrate may have an excellent degree of planarization and improved light extraction efficiency without degradation in performance of the diode, and low process and material costs and mass-production of the substrate may be easily achieved.
1. A substrate for an organic light emitting diode, comprising:
a base substrate;
a high refractive scattering layer formed on the base substrate, and having a scattering particle scattering light in a high refractive material;
an adhesive layer formed between the base substrate and the high refractive scattering layer to laminate the base substrate with the high refractive scattering layer; and
a high refractive material coating layer,
wherein an average diameter of the scattering particle is in a range of 3 to 20 μm,
wherein the high refractive scattering layer has a structure in which the scattering particle is immersed in the high refractive material, a surface of the high refractive scattering layer laminated with the base substrate by the adhesive layer has unevenness formed by the scattering particle, the unevenness formed by the scattering particle is formed between the high refractive scattering layer and the adhesive layer, and
the opposite surface of the surface of the high refractive scattering layer laminated with the base substrate by the adhesive layer has a planarized surface which has a maximum height roughness of 0.001 to 0.3 μm in a 10×10 μm 2 region,
wherein the high refractive scattering layer has an average thickness in a range of 30% to 80% of an average diameter of the scattering particle,
wherein the high refractive material has a refractive index of 1.7 to 3 with respect to light having a wavelength of 400 nm,
wherein the high refractive material coating layer is formed on the planarized surface of the high refractive scattering layer, and has a thickness of 0.1 to 5μm, and
wherein a refractive index of the high refractive material (Na), a refractive index of the scattering particle (Nb), a refractive index of the base substrate (Nc), and a refractive index of the adhesive layer (Nd) satisfy any one of the relationships represented by Equations 1 and 2:
0.3 ≤|Na−Nb|≤ 1.5, [Equation 1]
and
0.01 ≤|Nc−Nd|≤ 0.2. [Equation 2]
2. A substrate for an organic light emitting diode, comprising:
a base substrate;
a high refractive scattering layer formed on the base substrate, and having a scattering particle scattering light in a high refractive material;
an adhesive layer formed between the base substrate and the high refractive scattering layer to laminate the base substrate with the high refractive scattering layer; and
a high refractive material coating layer,
wherein an average diameter of the scattering particle is in a range of 3 to 20 μm,
wherein the high refractive material includes a binder and a nano particle having an average diameter in a range of 1 to 100 nm,
wherein the high refractive scattering layer has a structure in which the scattering particle is immersed in the high refractive material, a surface of the high refractive scattering layer laminated with the base substrate by the adhesive layer has unevenness formed by the scattering particle, the unevenness formed by the scattering particle is formed between the high refractive scattering layer and the adhesive layer, and the opposite surface of the surface of the high refractive scattering layer laminated with the base substrate by the adhesive layer has a planarized surface which has a maximum height roughness of 0.001 to 0.3 μm in a 10×10 μm 2 region,
wherein the high refractive scattering layer has an average thickness in a range of 30% to 80% of an average diameter of the scattering particle,
wherein the high refractive material has a refractive index of 1.7 to 3 with respect to a light having a wavelength of 400 nm,
wherein the high refractive material coating layer is formed on the planarized surface of the high refractive scattering layer, and has a thickness of 0.1 to 5 μm, and
wherein a refractive index of the high refractive material (Na), a refractive index of the scattering particle (Nb), a refractive index of the base substrate (Nc), and a refractive index of the adhesive layer (Nd) satisfy any one of the relationships represented by Equations 1 and 2:
0.3 ≤|Na−Nb|≤ 1.5, [Equation 1]
and
0.01 ≤|Nc−Nd|≤ 0.2. [Equation 2 ]
3. The substrate of claim 1 , wherein a refractive index of the high refractive material (Na), a refractive index of the scattering particle (Nb), a refractive index of the base substrate (Nc), and a refractive index of the adhesive layer (Nd) satisfy both Equation 1 and Equation 2.
4. The substrate of claim 2 , wherein a refractive index of the high refractive material (Na), a refractive index of the scattering particle (Nb), a refractive index of the base substrate (Nc), and a refractive index of the adhesive layer (Nd) satisfy both Equation 1 and Equation 2.