Luminescent Color Image Generation on Porous Silicon

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Science  26 Jun 1992:
Vol. 256, Issue 5065, pp. 1791-1792
DOI: 10.1126/science.256.5065.1791


Black and white images were projected onto n-type silicon (100) wafers during a photoelectrochemical etch to produce a color image that photoluminesces. The photoluminescence originates from a thin layer of luminescent porous silicon that is produced in the photoetch, and the colors that appear in the etched image arise from thin-film optical interference. A diffraction grating was also photoetched into the substrate, demonstrating simultaneous encoding of a gray-scale image into thin-film interference, luminescence, and diffraction phenomena.