Patent ID: 7741145

Claim:
A method for preparing an organic light-emitting device, comprising the steps of: a) preparing an organic light-emitting device by forming a first electrode, an organic material layer(s) and a second electrode on a substrate; b) adhering a transparent substance to the underside of the substrate that does not contact the first electrode, the upside of the second electrode that does not contact the organic material layer, or both of them in the organic light-emitting device; c) before or after the b) step, forming a plurality of continuous half-spherical convexes, having a diameter of 25-1,000 nm, on a first main surface of the transparent substance by a method comprising the steps of: (i) dipping an aluminum substrate having at least one aluminum surface in an acid solution, and applying an oxidation voltage of 10-400 V to the aluminum substrate so as to form an aluminum oxide layer on one surface of the aluminum substrate, in such a manner that a plurality of continuous recesses are formed on the aluminum oxide layer, and a plurality of continuous recesses having a curvature in identical direction to that of the recesses on the aluminum oxide layer are formed on an interface between the aluminum oxide layer and the aluminum substrate; (ii) removing the aluminum oxide layer from the aluminum substrate formed with the aluminum oxide layer thereon, thereby forming a plurality of continuous half spherical recesses having a diameter of 25-1,000 nm on one surface of the aluminum substrate; and (iii) forming a plurality of continuous half-spherical convexes, having a diameter of 25-1,000 nm, on the first main surface of a transparent substance by using the aluminum substrate formed with a plurality of continuous half spherical recesses as a mold.