Patent ID: 6049090
Filing Date: 2000-04-11
Classification: B82Y,H01L

Abstract:
A visible-wavelength electroluminescent display device comprising:a semiconductor host matrix characterized by a first conduction band energy level, a first valence band energy level, and a first bandgap energy corresponding to an energy difference between a minima of the first conduction band and a maxima of the first valence band energy levels, the semiconductor host matrix further characterized as being capable of conducting electrons and holes through the matrix, and as being substantially non-absorbing of visible wavelengths;a plurality of semiconductor particles disposed in the semiconductor host matrix, at least a portion of the semiconductor particle plurality being characterized by a second conduction band energy level that is less than the first conduction band energy level, and further being characterized by a second valence band energy level and a second bandgap energy corresponding to an energy difference between a minima of the second conduction band and a maxima of the second valence band energy levels; andmeans for providing electrons and holes in the host matrix to be conducted through the matrix to locations of the semiconductor particles for recombination at such locations between the second conduction band minima and the second valence band maxima to produce visible-wavelength luminescent radiation.