Light-emitting device and method for manufacturing the same
US6825056B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 30, 2002 |
| Grant date | Nov 30, 2004 |
| Priority date | — |
| Expiry date | Dec 30, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L21/0271
- WIPO fieldSemiconductors
- WIPO sectorElectrical engineering
Abstract
A nanometer size roughened structure is formed on a surface of a light-emitting element, and luminous efficiency is improved. The roughened structure is formed into the following shape to change refractive index smoothly: (1) the mean diameter of projections on the roughened surface is smaller than the light wavelength; (2) a pitch of the roughened surface is irregular; and (3) positions of the top and bottom of the roughened surface are distributed from their mean values within the light wavelength. The surface of such light-emitting element is obtained by forming a thin film on the surface of the light-emitting element using a block or graft copolymer comprising resin composition and forms a self-assembled microphase-separated structure; selectively removing at least one phase of the microphase-separated structure; and etching the surface of the light-emitting element using the remaining phase as an etching mask.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.