The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 27, 2018
Filed:
Mar. 31, 2017
Cree, Inc., Durham, NC (US);
Florin A. Tudorica, Chapel Hill, NC (US);
Brian Thomas Collins, Holly Springs, NC (US);
Cree, Inc., Durham, NC (US);
Abstract
A semiconductor light emitting device includes an LED and a recipient luminophoric medium that includes a first narrow-spectrum luminescent material that down-converts a first portion of the radiation emitted by the LED to radiation having a first peak wavelength in the green-yellow color range and a second narrow-spectrum luminescent material that down-converts a second portion of the radiation emitted by the LED to radiation having a second peak wavelength in an orange-red color range. The first and second luminescent materials and any additional narrow-spectrum luminescent materials that are included in the recipient luminophoric medium generate at least 80% of the light emitted by the recipient luminophoric medium. A CRI value of the combined light emitted by the semiconductor light emitting device is at least 60 and less than 80.