US 11,817,531 B1
Phosphor-converted red LEDs and color-tunable multi-LED lighting devices
Yl-Qun Li, Danville, CA (US); Jingqiong Zhang, Xiamen (CN); and Jungang Zhao, Suzhou (CN)
Assigned to Bridgelux, Inc., Fremont, CA (US)
Filed by Bridgelux, Inc., Fremont, CA (US)
Filed on Apr. 25, 2023, as Appl. No. 18/306,780.
Application 18/306,780 is a continuation in part of application No. PCT/US2023/060694, filed on Jan. 13, 2023.
Application PCT/US2023/060694 is a continuation of application No. PCT/CN2022/120875, filed on Sep. 23, 2022.
Claims priority of provisional application 63/299,408, filed on Jan. 13, 2022.
Int. Cl. H01L 33/50 (2010.01); H01L 25/075 (2006.01); C09K 11/77 (2006.01); C09K 11/61 (2006.01); C09K 11/02 (2006.01)
CPC H01L 33/504 (2013.01) [C09K 11/02 (2013.01); C09K 11/617 (2013.01); C09K 11/77342 (2021.01); C09K 11/77348 (2021.01); H01L 25/0753 (2013.01)] 22 Claims
OG exemplary drawing
 
1. A lighting device comprising:
a first LED having a wavelength of maximum intensity from 620 nm to 640 nm;
a second LED having a wavelength of maximum intensity from 500 nm to 565 nm;
a third LED having a wavelength of maximum intensity from 430 nm to 480 nm; and
a fourth LED for generating light comprising a CCT in a range from 1800K to 5000K;
wherein the first LED comprises a phosphor-converted LED comprising a narrowband red phosphor with a FWHM less than 55 nm, and a broadband red phosphor.