	US 11,901,492 B2
	High color rendering white light emitting devices and high color rendering photoluminescence compositions
Yi-Qun Li, Danville, CA (US); Gang Wang, Sunnyvale, CA (US); Haitao Yang, San Jose, CA (US); and Binghua Chai, Fremont, CA (US)
Assigned to Intematix Corporation, Fremont, CA (US)
Filed by Intematix Corporation, Fremont, CA (US)
Filed on Nov. 24, 2020, as Appl. No. 17/103,798.
Application 17/103,798 is a continuation in part of application No. 16/403,723, filed on May 6, 2019, granted, now 10,847,566, issued on Nov. 24, 2020.
Application 16/403,723 is a continuation in part of application No. 15/256,252, filed on Sep. 2, 2016, abandoned.
Claims priority of provisional application 62/667,351, filed on May 4, 2018.
Claims priority of provisional application 62/344,930, filed on Jun. 2, 2016.
Claims priority of provisional application 62/216,985, filed on Sep. 10, 2015.
Prior Publication US 2022/0165920 A1, May 26, 2022 Prior Publication US 2023/0093788 A9, Mar. 23, 2023
Int. Cl. H01L 33/50 (2010.01)

CPC H01L 33/504 (2013.01)

23 Claims

1. A light emitting device comprising:

a solid-state light emitter with a wavelength from 440 nm to 470 nm;

a cerium-activated garnet phosphor;

a broadband europium-activated nitride orange to red phosphor of general composition CaAlSiN₃:Eu; and

a narrowband manganese-activated fluoride red phosphor selected from the group consisting of: K₂SiF₆:Mn⁴⁺, K₂GeF₆:Mn⁴⁺, and K₂TiF₆:Mn⁴⁺;

wherein in response to a voltage, the device generates light comprising a first maximum intensity at a wavelength in a range from 530 nm to 600 nm and a second maximum intensity at a wavelength in a range from 625 nm to 635 nm, wherein a ratio of the first maximum intensity to the second maximum intensity is about 20% to about 50%; and

wherein said light comprises a color temperature in a range from about 2200K to about 6500K, a CRI Ra of at least 90, and the device has a luminous efficacy of at least 330 lm/W_opt.