Abstract
We describe a versatile and convenient approach to achieve fluorescence modulationby the preparation of composite nanoparticles (CNPs), based on photochromic5-methoxy-1,3,3-trimethyl-9′-hydroxyspiroindolinenaphthoxazine (SO), fluorescent4-(dicyanomethylene)-2-methyl-6-(p-dimethyl-aminostyryl)-4H-pyran (DCM), andemissive-assistant 1,3-bis(pyrene) propane (BPP) molecules, employing doping techniques.The mechanism of the fluorescence switch is the intermolecular energy transfer assupported by both steady-state and time-resolved spectroscopy results. The addition ofBPP not only enhances the contrast of the fluorescence signal between the ‘ON’ and ‘OFF’state, but also provides a convenient way to tune the excitation wavelength for reading thefluorescence. High-contrast ON/OFF (20:1) fluorescence switching is successfullyimplemented in the CNPs and also in a more practical PVA film loaded with the CNPs.This system may represent an alternative to the covalent system in potentially rewritablehigh-density optical data or image storage utilizing luminescence intensity readout schemes.
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