Phosphor-converted white light emitting diodes having narrow-band green phosphors

US10056530B1 · kind B1 · utility

Assignee

• EIE MATERIALS, INC. · US

Inventors

• Jonathan Melman · Lexington, US
• Robert Nordsell · Lexington, US
• Kristen Baroudi · Lexington, US
• Evan Thomas · Lexington, US
• Yong Bok Go · Lexington, US

Key dates

• Filing date: Aug 16, 2017
• Grant date: Aug 21, 2018
• Expiry date: Aug 16, 2037

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02B20/00

Abstract

In one aspect, a phosphor converted white light LED comprising a narrow green phosphor rather than a conventional broad green phosphor may simultaneously exhibit high R9, and high Luminance Efficacy of Radiation, optionally without use of a deep red phosphor to maintain desired red color rendering. In another aspect, a phosphor converted white light LED comprising a narrow green phosphor rather than a conventional broad green phosphor may provide an emission spectrum exhibiting a significant dip in the yellow region of the spectrum and thereby provide high red-green contrast without use of a filter. The yellow dip may be shallower than in conventional devices, and the device may therefore be brighter, while maintaining desired CRI and R9.