We prepared for the first time photoactive colloidal nanospheres consisting of hydrophobic CdSe/ZnS core−shell quantum dots encapsulated in an amphiphilic PMAT polymeric shell containing photochromic diarylethene DAE1 with stoichiometry of ∼6 dye molecules per single quantum dot. The UV-induced photoisomerization of DAE1 molecules results in the partial quenching of the quantum dot emission due to FRET from the quantum dot to DAE1 photoisomer with its absorption band spectrally overlapped with the quantum dot emission. The modulation of the quantum dot emission is reversible under cyclic UV−vis-induced open−closed photoisomerization of DAE1.

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A series of spiropyrans possessing photochromic properties in solid state were investigated. UV irradiation (λmax=365nm) of the thin vacuum deposited spiropyran films results in conversion of the colorless form to the photocolored one. The reaction is photochemically and thermally reversible. The photochromic activity of the solid material and polystyrene matrix has been compared. Raman spectroscopy has been used for studying the influence of metallic surface on the adsorbed spiropyran layers.

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