Granted Patent B2

US 12,624,283 · App. 17/754,783 · Granted May 12, 2026

Inventors: Stefan Fischer (Soest, DE); David Böhnisch (Kirchheim am Neckar, DE); Thomas Jüstel (Witten, DE); Simone Schulte (Essen, DE); Markus Hallack (Schermbeck, DE)

Assignee: Evonik Operations GmbH

C09K11/77742C09K11/77062

Abstract

Claims (36)

1 . A silicate-based material, comprising:

a crystalline silicate material doped with at least one lanthanide ion selected from the group consisting of praseodymium, gadolinium, and

wherein the crystalline silicate material converts electromagnetic radiation energy of at least one longer wavelength in a range of 380-550 nm electromagnetic radiation energy of at least one shorter wavelength in a range of 220 to 425 nm, wherein the at least one longer wavelength has a longer wavelength than the at least one shorter wavelength;

wherein the crystalline silicate material is selected from the general formula I

A 1-x-y-z B* y B 2 SiO 4 :Ln 1 x ,Ln 2 z .  I

wherein x=0.0001-0.05, z=0 or z=0.0001 to 0.3, and y=x+z,

wherein A is selected from the group consisting of Mg, Ca, Sr and Ba,

wherein B is selected from the group consisting of Li, Na, K, Rb and Cs,

wherein B* is selected from the group consisting of Li, Na and K, wherein B equal to B* or B being not equal to B*,

Ln 1 is praseodymium (Pr), and

Ln 2 is gadolinium (Gd).

2 . The silicate-based material according to claim 1 , wherein the crystalline silicate material is not a hydrate of a silicate.

3 . The silicate-based material according to claim 1 , wherein a crystallinity of the silicate-based material is greater than 70%.

4 . The silicate-based material according to claim 1 , wherein the crystalline silicate material comprises:

a crystalline pure phase, or

a silica-based material comprising at least one crystal phase that encompasses at least 90 weight-% of the silica-based material.

5 . The silicate-based material according to claim 1 , wherein the crystalline silicate material is a solid solution of a crystalline silicate or of crystalline silicate doped with lanthanide ions comprising at least one alkali ion and at least one earth alkali ion.

6 . A process for the production of a silicate-based material, the process comprising:

combining the following components i), ii), and iii),

i) and/or lanthanide oxide,

wherein a lanthanide ion in the at least one lanthanide salt and/or lanthanide oxide is selected from the group consisting of praseodymium, gadolinium, erbium, and neodymium,

ii) a silicate, and

iii) at least one earth alkali salt and at least one alkali salt selected from the group consisting of a lithium salt, a lithium compound, a sodium salt, and a potassium salt,

wherein the combining comprises:

a) blending i), ii), and iii) by milling, and obtaining a mixture, or

b) blending i), ii), and iii) in an organic polar or non-polar solvent that is not a protic solvent, and obtaining a mixture, wherein the obtained mixture of b) is calcinated at 600° C. to 1000° C. to remove organic components, and to obtain a calcinated mixture,

performing a calcination of the mixture of a) or the calcinated mixture of b) in a calcination at a temperature below a melting temperature of the silicate-based material, wherein at least partial crystallization occurs, and

performing a further calcination under a reducing atmosphere, wherein the lanthanide ion is reduced to an Ln 3+ ion, and

obtaining the silicate-based material,

wherein the obtained silicate-based material is milled, and

wherein the obtained silicate-based material is subjected to tribological impacts at 100 to 500 rotations/min for 1 to 6 hours, using corundum as milling material.

7 . A composition, foil or film, comprising the silicate-based material according to claim 1 for self-disinfection purposes or for reduction of microorganisms.

8 . A method, comprising:

adding the silicate-based material according to claim 1 into a coating composition or a material to provide a coating or surface that is able to inactivate microorganisms covering the coating or surface under exposure of electromagnetic radiation energy of a longer wavelength in a range of 500 nm and below.

9 . The silicate-based material according to claim 1 , wherein an emission maximum of the electromagnetic radiation energy of the shorter wavelengths has an intensity of at least 1⋅10 3 counts/(mm 2 *s).

10 . The silicate-based material according to claim 1 , wherein in formula I, B and B* are not equal.

Priority Claims (1)

Continuity (1)

References Cited (79)