Emitting with structures located at positions which prevent certain disadvantageous modes and enhance generation of light in advantageous modes
US5264715A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 6, 1992 |
| Grant date | Nov 23, 1993 |
| Priority date | — |
| Expiry date | Jul 6, 2012 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/862
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A light emitting device is provided with mirrors placed on opposite sides of the source of light and spaced apart by a distance that is determined as a function of the wavelength of the light emitted by the light source. One particular embodiment of the present invention spaces the mirrors apart by a distance equal to n.lambda./2+.lambda./4, where n is an integer value that is maintained as small as possible within practical constraints. The close proximity of the mirrors and their particular spacing which is determined as a function of the wavelength inhibits undesirable modes of light emission in directions toward the mirrors. This inhibition of light in undesirable modes perpendicular to the mirrors enhances the production of light in modes that are parallel to the mirror surfaces. The overall light output efficiency of the device is enhanced through the inhibition of these undesirable modes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.