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The character of the adsorbent strongly influences the photoluminescence of adsorbed dyes. Inorganic adsorbents form all known types of chemisorption bonds. Interesting interactions occur on the surface of semiconductors: e.g., inorganic luniinophors and solids containing hydroxyl groups. The adsorption of dyes on inorganic phosphors can result in the quenching of the fluorescence of the dye accompanied by a marked change in the intensity but no change in the spectra of the lun~inescence of the phosphor. Striking changes in the luminescence of dyes occur when they are hydrogen-bonded to the solid.

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