Fifty years ago, on October 9, 1962, Nick Holonyak invented the first practically useful LED light while working as a consulting scientist for the General Electric Company labs in Syracuse, New York.
a, Device structure and b, schematic energy band diagram of a hybrid LED. c, EL spectra, d, current density-voltage, e, luminance-voltage and f, EQE- current density characteristics of the PeLED, OLED ...
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