Photo-chemical generation of stable fluorescent derivatives of rhodamine B
AssigneeTriDStore IP, LLC
InventorsNatalia T. Sokoluk, Vladimir V. Shubin, Eugene B. Levich, Jacob N. Malkin
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Abstract
The present invention relates to the field of optical recording materials, in particular, fluorescent compounds and matrices suitable for use in optical memory systems, including three dimensional optical memory systems for READ ONLY MEMORY (ROM). In particular, nonfluorescent Rhodamine B lactams are photochemically transformed into fluorescent Rhodamine B derivatives.
Claims16
An optical three dimensional memory system comprising a layer, said layer having an active medium responsive to electromagnetic radiation, said active medium comprising at least a non-fluorescent Rhodamine B compound having the structure D, which upon being irradiated is converted to a fluorescent state thereby storing information within said active medium
- wherein Y is selected from the group consisting of o-nitrophenyl, m-nitrophenyl, m-halogenophenyl, p-fluorophenyl, p-iodophenyl, alkylphenyl and o-methoxyphenyl.
A method of optically recording information within a three dimensional memory system comprising an active medium including at least one non-fluorescent Rhodamine B lactam, comprising the steps of:
- applying a first and second electromagnetic radiation to said non-fluorescent Rhodamine B lactam and transforming said compound into a fluorescent form, said first and second electromagnetic radiation having different wavelengths;
- whereby said transformation from a non-fluorescent compound into a fluorescent compound takes place by photochemical reaction to record information in said active medium, and wherein said Rhodamine B lactam has the following structure:
- where Y is phenyl, nitrophenyl, halogenophenyl, alkylphenyl or o-methoxyphenyl.
Dependencies are inferred from the claim text.