Semi-insulating edge emitting light emitting diode
US5608234A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 23, 1996 |
| Grant date | Mar 4, 1997 |
| Priority date | — |
| Expiry date | Feb 23, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/824
Abstract
Light emitting devices are requiring greater switching speeds to achieve greater modulation bandwidths. The problems of intrinsic capacitance associated with conventional semiconductor heterojunction devices are reduced by the reduction of pn junction capacitance as well as the use of a semi-insulating blocking layer and a conductive substrate. Furthermore, a light absorbing layer is disposed on one side of an unetched portion of the semi-insulating material and an active layer disposed on an opposite side of the unetched portion. Also, the interface of the semi-insulating material and the active and absorbing layers are at prescribed angles that reduce back reflections to the absorbing and active layers. This arrangement reduces pumping in the absorbing region and thus reduces the lasing effect, allowing for a stable LED. The angle at the interface is determined by having the structure at a predetermined crystallographic direction and having the semi-insulating material etched to reveal a predetermined crystalline plane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.