Layered phosphor in glass

US11367812B2 · kind B2 · utility

Assignee

• Ferro Corporation · US

Inventors

• Cody J. Gleason · Solon, US
• Srinivasan Sridharan · Strongsville, US
• George E. Sakoske · Washington, US
• Ellen S. Tomey · Princeton Junction, US
• Chao Ma · Tangxia, CN
• Jackie D. Davis · Cleveland, US
• Yi Yang · Broadview Heights, US
• Stanley Wang · Taipei, TW

Key dates

• Filing date: Jun 3, 2020
• Grant date: Jun 21, 2022
• Expiry date: Aug 7, 2040

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10H20/8514

Abstract

A phosphor in glass (PiG) cover is provided to modulate the color emitted from an LED chip. The PiG cover includes an active layer including glass and phosphor, and a secondary layer including glass and free of phosphor. The active layer is stacked on the secondary layer to form the PiG cover. Alternately the PiG includes an active layer sandwiched between two secondary layers. Two or more active layers can be stacked to each other or disposed side-by-side. An LED chip is arranged under the PiG cover to form an LED package.