1. Semiconductor emitter junctions
1.1 Operating principles
Light-emitting semiconductor devices use electroluminescence as a physical effect. The phenomenon of electroluminescence is attributed to the radiative recombination of excess charge carriers injected into the vicinity of, say, a P-N junction.
The energy released in the form of radiation is equal to the difference between the energy of the ionized state, known as the "electron-hole pair", and the energy of the bound state (recombined electron and hole).
Two conditions must be met for light emission to occur. Firstly, the probability of a radiative transition must be high, and secondly, there must be a high density of carriers capable of making this transition.
The first point is obtained...
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Semiconductor emitter junctions
Bibliography
References
Suppliers and materials
(non-exhaustive list)
Polytec's integrating sphere
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Power meter :
Agilent 8163A;
ILX Lightwave OMM-6810B.
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Optical spectrum analyzers (OSA) :
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