US 11,757,069 B2
LED white light device, preparation method thereof, and LED backlight module
Haijun Wang, Guangdong (CN); Yangcheng Huang, Guangdong (CN); Xiang Chen, Guangdong (CN); Fabo Liu, Guangdong (CN); Zhonghai Yan, Guangdong (CN); Danlei Gong, Guangdong (CN); Junhua Chen, Guangdong (CN); Yushan Lin, Guangdong (CN); Jian Gan, Guangdong (CN); and Haixing Tan, Guangdong (CN)
Assigned to FOSHAN NATIONSTAR OPTOELECTRONICS CO., LTD, Foshan (CN)
Appl. No. 16/609,453
Filed by FOSHAN NATIONSTAR OPTOELECTRONICS CO., LTD, Guangdong (CN)
PCT Filed Oct. 23, 2018, PCT No. PCT/CN2018/111518
§ 371(c)(1), (2) Date Oct. 30, 2019,
PCT Pub. No. WO2020/034391, PCT Pub. Date Feb. 20, 2020.
Claims priority of application No. 201810932962.9 (CN), filed on Aug. 16, 2018.
Prior Publication US 2021/0167256 A1, Jun. 3, 2021
Int. Cl. H01L 33/50 (2010.01); C09K 11/77 (2006.01); C09K 11/08 (2006.01)
CPC H01L 33/504 (2013.01) [C09K 11/0883 (2013.01); C09K 11/77348 (2021.01); C09K 11/77927 (2021.01); H01L 2933/0041 (2013.01)] 13 Claims
OG exemplary drawing
 
1. An LED white light device, comprising a blue light chip and phosphors, wherein the blue light chip has a band of (455-470) nm;
the phosphors consist of a dual-band yellow phosphor and a red phosphor having an excited light peak wavelength range of (610-660) nm; and
the yellow phosphor and the red phosphor are mixed according to a proportion of 1:(0.03-0.2) and cover the blue light chip, wherein the yellow phosphor is a lanthanum silicon nitrogen compound, such that blue light emitted by the packaged LED white light device has a peak wavelength range of (450-465) nm, and a ratio of energy of a spectrum of the packaged LED white light device to energy of a blue light spectrum having a wavelength range of (400-450) nm is 1:(0.05-0.2); the yellow phosphor comprises La3Si6N11:Ce3+ having a peak wavelength of (530-550) nm and (600-620) nm.