US 12,245,445 B2
White light source including LED and phosphors
Tatsunori Itoga, Yokohama (JP); Ryoji Tsuda, Fujisawa (JP); Naotoshi Matsuda, Chigasaki (JP); and Yoshitaka Funayama, Yokohama (JP)
Assigned to SEOUL SEMICONDUCTOR CO., LTD., Ansan-si (KR)
Filed by SEOUL SEMICONDUCTOR CO., LTD., Ansan-si (KR)
Filed on Jan. 20, 2023, as Appl. No. 18/099,457.
Application 18/099,457 is a continuation of application No. 17/161,841, filed on Jan. 29, 2021, granted, now 11,563,155.
Application 17/161,841 is a continuation of application No. 16/196,095, filed on Nov. 20, 2018, granted, now 10,957,826, issued on Mar. 23, 2021.
Application 16/196,095 is a continuation of application No. PCT/JP2017/018892, filed on May 19, 2017.
Claims priority of application No. 2016-101548 (JP), filed on May 20, 2016.
Prior Publication US 2023/0163257 A1, May 25, 2023
Int. Cl. H01L 33/50 (2010.01); C09K 11/08 (2006.01); C09K 11/64 (2006.01); C09K 11/66 (2006.01); C09K 11/73 (2006.01); C09K 11/77 (2006.01); H01L 25/075 (2006.01)
CPC H01L 33/504 (2013.01) [C09K 11/0883 (2013.01); C09K 11/64 (2013.01); C09K 11/66 (2013.01); C09K 11/73 (2013.01); C09K 11/7734 (2013.01); C09K 11/77342 (2021.01); C09K 11/77348 (2021.01); C09K 11/7739 (2013.01); C09K 11/7774 (2013.01); H01L 25/0753 (2013.01); H01L 33/50 (2013.01); Y02B 20/00 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A lighting device, comprising:
a substrate including a circuit;
a light emitting diode disposed on the substrate; and
a wavelength conversion layer disposed on the light emitting diode and comprising a plurality of wavelength converters,
wherein a light generated by mixing light emitted from the light emitting diode and the plurality of wavelength converters is a white light,
wherein the white light has no light emission spectrum peak that has a ratio of a largest maximum value to a minimum value of greater than 1.9,
wherein the ratio is defined by a light emission spectrum intensity in a wavelength that indicates the largest maximum value divided by a light emission spectrum intensity in a wavelength that indicates the minimum value,
wherein the largest maximum value is a largest value among at least one maximum light emission spectrum intensity value present in a wavelength range of 400 nm to 500 nm in a light emission spectrum of the white light,
wherein the minimum value is a light emission intensity value having a minimum value and being adjacent to the largest maximum value in a longer wavelength side of the light emission spectrum,
wherein each of the plurality of wavelength converters includes a particle size with a range of 10 μm or longer and 50 μm or shorter,
wherein the white light has a color temperature with a range of 2500 K to 6500 K, and
wherein a light emission spectrum peak at a color temperature below 3000K has a first ratio of a largest maximum value to a minimum value that is different from a second ratio of a largest maximum value to a minimum value of a light emission spectrum peak at a color temperature of about 5000K.