US 12,218,290 B2
LED lighting apparatus having improved color rendering and LED filament
Jong Kook Lee, Ansan-si (KR); Jun Myung Song, Ansan-si (KR); and Seong Jin Lee, Ansan-si (KR)
Assigned to SEOUL SEMICONDUCTOR CO., LTD., Ansan-si (KR)
Filed by SEOUL SEMICONDUCTOR CO., LTD., Ansan-si (KR)
Filed on Dec. 5, 2022, as Appl. No. 18/075,330.
Application 18/075,330 is a continuation of application No. 16/649,144, granted, now 11,527,682, previously published as PCT/KR2019/001534, filed on Feb. 7, 2019.
Claims priority of application No. 10-2018-0022178 (KR), filed on Feb. 23, 2018.
Prior Publication US 2023/0099215 A1, Mar. 30, 2023
Int. Cl. H01L 33/50 (2010.01); C09K 11/77 (2006.01); F21K 9/23 (2016.01); F21K 9/64 (2016.01); H01L 25/075 (2006.01); H01L 33/30 (2010.01); F21Y 115/10 (2016.01)
CPC H01L 33/504 (2013.01) [C09K 11/7777 (2013.01); F21K 9/23 (2016.08); F21K 9/64 (2016.08); H01L 25/0753 (2013.01); H01L 33/30 (2013.01); F21Y 2115/10 (2016.08)] 20 Claims
OG exemplary drawing
 
1. A lighting device, comprising:
at least one light emitter configured to emit blue light;
a green phosphor having an emission peak in a range of 500 nm to 550 nm;
a yellow phosphor having an emission peak in a range of 550 nm to 600 nm; and
a red phosphor having an emission peak in a range of 600 nm to 650 nm,
wherein the yellow phosphor and the red phosphor have different full widths at half maximum, and the full width at half maximum of the yellow phosphor is longer than the full widths at half maximum of the red phosphor,
wherein, in an emission spectrum, an intensity of light emitted from the lighting device is configured to increase from 500 nm to 600 nm, and
wherein the intensity of light emitted from the lighting device at 700 nm is configured to be less than about 10% of the maximum intensity of light emitted from the lighting device.