# US 2025/0146936 A1 · Method of generating a fluorescent property in a material using a laser > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0146936 A1 - Document ID: US20250146936A1 - Status: Published application - Kind: A1 - Application number: 18/917,037 - Filed: 2024-10-16 - Published: 2025-05-08 - Earliest claimed: 2023-10-17 - Assignees: Giesecke+Devrient Epayments GmbH - Applicants: Giesecke+Devrient ePayments GmbH - Inventors: Cristina Fabian; Klaus Kohl; Josef Riedl - Web page: https://patentgrep.com/patent/US20250146936A1 ## CPC - B42D 25/41: using electromagnetic radiation (B42D25/435 takes precedence) - G01N 21/6402: {Atomic fluorescence; Laser induced fluorescence} - B41M 5/267: {Marking of plastic artifacts, e.g. with laser} - B42D 25/23: Identity cards - B42D 25/36: comprising special materials - B42D 25/382: absorbing or reflecting infrared light - B42D 25/387: absorbing or reflecting ultraviolet light - B42D 25/455: using heat - B42D 25/46: using pressure - G01N 21/6456: {Spatial resolved fluorescence measurements; Imaging} - B41M 3/144: {using fluorescent, luminescent or iridescent effects} - G01N 2021/6463: {Optics} - G01N 2201/06113: Coherent sources; lasers - B42D: BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS - G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q) - B41M: PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING, (correction of typographical errors B41J; processes for applying transfer pictures or the like B44C1/16; fluid media for correction of typographical errors by coating C09D10/00; printing textiles D06P) ## Abstract A method for generating an at least partial fluorescent property in a material is provided. The method comprises providing the material, providing a laser, arranging the material in a beam path of the laser such that the laser can selectively section wise irradiate the material, and at least section wise irradiating a surface of the material with the laser. The at least sectionwise irradiating of the surface of the material with the laser is performed until visible traces of smoke are formed on the irradiated areas of the surface of the material, whereby a fluorescent property is generated in the irradiated areas. ## Claims ### Claim 1 A method for generating an at least partial fluorescent property in a material the method comprising: providing the material; providing a laser; arranging the material in a beam path of the laser, such that the laser can selectively section wise irradiate the material; and at least section wise irradiating a surface of the material with the laser; wherein the at least section wise irradiating of the surface of the material with the laser is performed until visible traces of smoke are formed on the irradiated areas of the surface A ty of the material, whereby a fluorescent property is generated in the irradiated areas. ### Claim 2 (depends on 1) The method of claim 1, wherein the laser is one of a CO2 laser and a fiber laser. ### Claim 3 (depends on 2) The method of claim 2, wherein, if the laser is a CO2 laser, the CO2 laser is operated at a power between 60 W and 100 W and a wavelength of 10.6 μm; and wherein, if the laser is a fiber laser, the fiber laser is operated with a power between 20 W and 30 W and a wavelength of 1064 nm. ### Claim 4 (depends on 3) The method of claim 3, wherein irradiating the surface of the material is carried out with a pulsed laser. ### Claim 5 (depends on 4) The method of claim 4, wherein irradiating the surface of the material comprises at least irradiating the surface under a first angle to generate a first fluorescence and irradiating the surface under a second angle to generate a second fluorescence to thereby generate a direction-dependent fluorescence property such that the respective fluorescence is only visible under the respective angle. ### Claim 6 (depends on 5) The method of claim 5, wherein the material is a card-shaped material. ### Claim 7 (depends on 6) The method of claim 6, wherein the card-shaped material comprises a layered structure having a plurality of layers laminated together. ### Claim 8 (depends on 7) The method of claim 7, wherein the card-shaped material is a card-shaped data carrier. ### Claim 9 (depends on 8) The method of claim 8, wherein the card-shaped data carrier is one of an identity card, a data page of a passport, a driver's license, and a payment card. ### Claim 10 (depends on 9) The method of a claim 9, wherein the section wise irradiating of the surface is carried out according to a pattern or motif in order to generate a corresponding fluorescent motif. ### Claim 11 (depends on 10) The method of claim 10, wherein the irradiated areas irradiated during the irradiating are selected such that the generated fluorescence property serves as a safety feature. ### Claim 12 (depends on 11) The method of claim 11, further comprising removing the traces of smoke from the surface after irradiating. ### Claim 13 (depends on 12) The method of claim 12, wherein the material comprises at least one of the following materials: opaque and/or transparent polycarbonates, PC; refined materials; opaque and/or transparent polyethylene terephthalate, PET; acrylonitrile-butadiene-styrene copolymer, ABS; bio Polycarbonates, PC, and polyvinyl chloride, PVC. ### Claim 14 (depends on 13) The method of claim 13, further comprising cutting out the irradiated area such that the edges of the cut-out irradiated area exhibit the fluorescent property. ### Claim 15 (depends on 14) The method of claim 14, wherein the material has a flat design; and wherein the method further comprises inserting the material as an insert into a card-shaped data carrier.