Phosphor-converted light emitting device

US6642652B2 · kind B2 · utility

Assignee

• Lumileds Lighting US, LLC · US

Inventors

• William David Collins, III · San Jose, US
• Michael R. Krames · Los Altos, US
• Godefridus Johannes Verhoeckx · Eindhoven, NL
• Nicolaas Joseph Martin Van Leth · Valkenswaard, NL

Key dates

• Filing date: Jun 11, 2001
• Grant date: Nov 4, 2003
• Expiry date: Oct 19, 2021

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01L2924/3025

Abstract

A light source is disclosed that includes a light emitting device such as a III-nitride light emitting diode covered with a luminescent material structure, such as a single layer or multiple layers of phosphor. Any variations in the thickness of the luminescent material structure are less than or equal to 10% of the average thickness of the luminescent material structure. In some embodiments, the thickness of the luminescent material structure is less than 10% of a cross-sectional dimension of the light emitting device. In some embodiments, the luminescent material structure is the only luminescent material through which light emitted from the light emitting device passes. In some embodiments, the luminescent material structure is between about 15 and about 100 microns thick. The luminescent material structure is selectively deposited on the light emitting device by, for example, stenciling or electrophoretic deposition.