The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 09, 2022
Filed:
Oct. 08, 2020
Lumileds Llc, San Jose, CA (US);
Jens Meyer, Aachen, DE;
Marinus Johannes Petrus Maria van Gerwen, Aachen, DE;
Ronja Missong, Aachen, DE;
Joerg Feldmann, Aachen, DE;
Hans-Helmut Bechtel, Aachen, DE;
Lumileds LLC, San Jose, CA (US);
Abstract
A particle layer is positioned over a light output surface of a light emitting diode. A transparent protection layer positioned between and in contact with the light output surface and the particle layer. The particle layer comprises a multitude of optically scattering or luminescent particles and a thin coating layer of transparent material coating particles of the multitude. The particles are characterized by a D50 greater than about 1.0 μm and less than about 30. μm; the coating layer has a thickness less than about 0.20 μm. The protection layer is less than about 0.05 μm thick and includes one or more materials different from material of the coating layer. The protection and coating layers can each include one or more metal or semiconductor oxides. Oxide precursor reactivities, with respect to the corresponding light output surface, are less for protection layer material than for coating layer material.