Protection layer for a light emitting diode

US11411146B2 · kind B2 · utility

Assignee

• LUMILEDS LLC · US

Inventors

• Jens Meyer · Dresden, DE
• Marinus Johannes Petrus Maria van Gerwen · Aachen, DE
• Ronja Missong · Aachen, DE
• Joerg Feldmann · Aachen, DE
• Hans-Helmut Bechtel · Roetgen, DE

Key dates

• Filing date: Oct 8, 2020
• Grant date: Aug 9, 2022
• Expiry date: Jan 9, 2041

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10H20/882

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.