Patent ID: 11912914
Assignee: LUMILEDS, LLC
Field: Surface technology, coating (Chemistry)
Classification: CPC C  F  H | IPC C  F  H

Claim 14:
15. A luminescent material comprising luminescent particles, wherein the luminescent particles comprise
(i) a luminescent core comprising a primer layer on the luminescent core, wherein the primer layer has a primer layer thickness (d1) in the range of 0.1-5 nm, and wherein the primer layer has a chemical composition differing from the chemical composition of the core;
(ii) a main ALD coating layer comprising a multilayer with two or more layers having different chemical compositions, wherein the main ALD coating layer has an ALD coating layer thickness (d2) in the range of 5-250 nm, wherein the multilayer comprises one or more layers comprising an oxide of one or more of Al, Zn, Hf, Ta, Zr, Ti, Sn, Nb, Y, Ga, and V, and wherein one or more of the two or more layers of the multilayer have chemical compositions differing from the chemical composition of the primer layer, and
(iii) a main sol-gel coating layer, wherein the main sol-gel coating has a main sol-gel coating layer thickness (d3) in the range of 50-700 nm, wherein the main sol-gel coating layer has a chemical composition differing from one or more of the two or more layers of the multilayer; wherein the main ALD coating layer is arranged between the primer layer and the main sol-gel layer.