Phosphor-converted light emitting device

US10283681B2 · kind B2 · utility

Assignee

• Cree, Inc. · US

Inventors

• Brian T. Collins · Holly Springs, US
• Matthew Donofrio · Raleigh, US
• Kevin Haberern · Cary, US
• Bennett Langsdorf · Cary, US
• Anoop Mathew · Peabody, US
• Harry A. Seibel, II · Morrisville, US
• Iliya Todorov · Durham, US
• Bradley E. Williams · Worthington, US

Key dates

• Filing date: May 14, 2014
• Grant date: May 7, 2019
• Expiry date: Jul 17, 2034

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10H20/84

Abstract

A phosphor-converted light emitting device includes a light emitting diode (LED) on a substrate, where the LED comprises a stack of epitaxial layers comprising a p-n junction. A wavelength conversion material is in optical communication with the LED. According to one embodiment of the phosphor-converted light emitting device, a selective filter is adjacent to the wavelength conversion material, and the selective filter comprises a plurality of nanoparticles for absorbing light from the LED not down-converted by the wavelength conversion material. According to another embodiment of the phosphor-converted light emitting device, a perpendicular distance between a perimeter of the LED on the substrate and an edge of the substrate is at least about 24 microns. According to another embodiment of the phosphor-converted light emitting device, the LED comprises a mirror layer on one or more sidewalls thereof for reducing light leakage through the sidewalls.