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مهندسی شیمی::
نوار ممنوع
The valence band (VB), the forbidden band (FB) and the conduction band (CB).
By altering the make up of composite compounds, we can adjust the emitting wavelength by changing the width of the forbidden band.
These are created with compatible materials from different forbidden bands.
When the thickness of the shell is nanometers deep and the shell is sandwiched between the shells of more important forbidden bands (example: AlGaAs/GaAs/AlGaAs) then we see atomic pseudo-states starting to appear just as in quantum boxes, giving rise to a new type of quantum optoelectronics.
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