Patent ID: 7422649
Filing Date: 2008-09-09
Classification: B41M,C09K,G11B,H05B

Abstract:
1. A method for recording information in a luminescent composition, comprising: a) providing a luminescent composition which comprises, in a suitable carrier or diluent, at least a first and second luminescent compounds, wherein the first luminescent compound is a donor luminescent compound having a peak luminescent emission spectrum at a given wavelength, wherein the second luminescent compound is an acceptor luminescent compound having a peak absorption spectrum at a longer wavelength than the given wavelength, and wherein the emission spectrum of the donor luminescent compound at least partially overlaps the absorption spectrum of the acceptor luminescent compound, wherein said donor and acceptor luminescent compounds are selected from the group consisting of a conjugated organic material, a non-conjugated organic material, an optical brightener and an organic metal complex; b) combining said composition with a substrate, so that at least a portion of the composition is available for exposure to a photon source, and; c) embedding information at predetermined sites in said combined composition by localized exposure to a photon source, said embedding resulting in an information pattern when exposed to a luminescence deciphering device.