A new photosensitive polymeric material for WORM optical data storage using multichannel two-photon fluorescence readout

    Authors

    K. D. Belfield;K. J. Schafer

    Comments

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    Abbreviated Journal Title

    Chem. Mat.

    Keywords

    ABSORBING FLUORENE DERIVATIVES; 2-PHOTON; Chemistry, Physical; Materials Science, Multidisciplinary

    Abstract

    We report image formation via photoinduced fluorescence changes in a polymeric medium with nondestructive two-photon fluorescence readout of a multilayer structure. A two-photon absorbing fluorescent dye possessing functional groups with differential basicity, (7-benzothiazolyl-9,9-didecyl-2,2-(N,N-diphenylamino)fluorene) (1), underwent protonation in the presence of a photoinduced acid generator upon exposure to a broadband UV light source or femtosecond near-IR laser irradiation. Solution studies demonstrated formation of monoprotonated and diprotonated species upon irradiation, each resulting in distinctly different absorption and fluorescence properties. The fluorescence of the original, neutral fluorophore was reduced upon monoprotonation, leading to a concomitant increase in fluorescence at longer wavelengths due to the monoprotonated form. Experiments in polymer films demonstrate the changes in fluorescence properties of the fluorophores can be employed for a write-once read-many (WORM) data storage medium with a two-photon fluorescence readout. Two-channel, two-photon fluorescence imaging provided both "positive" and "negative" image readout capability.

    Journal Title

    Chemistry of Materials

    Volume

    14

    Issue/Number

    9

    Publication Date

    1-1-2002

    Document Type

    Article

    Language

    English

    First Page

    3656

    Last Page

    3662

    WOS Identifier

    WOS:000178128900008

    ISSN

    0897-4756

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