Excitation-intensity-dependent, color-tunable, dual emitting nanocrystals

A device for photo-stimulated color emission comprising:

• at least one plurally doped semiconducting nanoparticle comprising at least one semiconducting material and a plurality of at least one dopant, wherein said plurally doped semiconducting nanoparticles upon excitation permit a plurality of emission processes including a radiative recombination at the nanocrystal hand edge and at least one with an energy transfer to a dopant ion;
• and
• an irradiation source with a variable intensity output, wherein emissions by said plurally doped semiconducting nanoparticles of electromagnetic radiation occur at a plurality of wavelength maxima wherein the relative intensities of said emissions of said wavelength maxima depends upon the intensity of the irradiation.