Semiconducting Light-Emitting Devices. James A. Johnson 16 December 2006. Direct Semiconductors. Indirect Semiconductors. Semiconducting Materials . Conduction band exists directly “above” valence band.
James A. Johnson
16 December 2006
Indirect SemiconductorsSemiconducting Materials
Edge Light-Emitting Device
Surface Light-Emitting Device
It is difficult to construct 2-dimensional arrays of edge-emitting devices.
Packaging must be used to improve directionality of light emission.
Surface Emitting Devices
Fabrication requires etching of portions of layers to place electrical contacts.
Due to placement of the electrical contacts, it is difficult to guarantee uniform current in each layer of the device.Challenges with Light-Emitting Devices