| 摘要 |
A nanometer size roughened structure is formed on a surface of a light-emitting element, and luminous efficiency is improved. The roughened structure (18) on the surface of the light-emitting element (10, 14, 15) of the invention is formed into the following shape such that the refractive index smoothly changes:
1) the mean diameter of projections on the roughened surface (18) is smaller than the light wavelength;
2) a pitch of the roughened surface (18) is irregular; and
3) positions of the top and bottom of the roughened surface (18) are distributed from their mean values within the light wavelength in order to give a smooth gradient of the refractive index. The surface of such light-emitting element (10, 14, 15) is obtained by forming a thin film on the surface of the light-emitting element using a resin composition which contains a block copolymer or graft copolymer and forms a microphase-separated structure in a self-organization manner; selectively removing at least one phase of the microphase-separated structure of the thin film formed on the surface; and etching the surface (18) of the light-emitting element using the remaining phase as an etching mask. |
