	US 11,898,712 B2
	White light emitting device, light bar and light apparatus
Jinhui Zhang, Guangdong (CN); Yikai Yuan, Guangdong (CN); Long Zhao, Guangdong (CN); Chuyi Li, Guangdong (CN); and Cheng Li, Guangdong (CN)
Assigned to FOSHAN NATIONSTAR OPTOELECTRONICS CO., LTD, Guangdong (CN)
Appl. No. 17/607,045
Filed by FOSHAN NATIONSTAR OPTOELECTRONICS CO., LTD., Guangdong (CN)
PCT Filed Dec. 12, 2019, PCT No. PCT/CN2019/124920 § 371(c)(1), (2) Date Oct. 28, 2021, PCT Pub. No. WO2020/220688, PCT Pub. Date Nov. 5, 2020.
Claims priority of application No. 201910356846.1 (CN), filed on Apr. 29, 2019.
Prior Publication US 2022/0214019 A1, Jul. 7, 2022
Int. Cl. F21S 4/28 (2016.01); F21V 9/30 (2018.01)

CPC F21S 4/28 (2016.01) [F21V 9/30 (2018.02)]

17 Claims

1. A white light emitting device, wherein a relative spectrum of the white light emitting device is ϕ(λ), and a relative spectrum of a black body radiation with a corresponding color temperature is S(λ), wherein an area normalization is performed on ϕ(λ) and S(λ) to convert an equal energy spectrum ϕ′(λ) of the white light emitting device and an equal energy spectrum S′(λ) of the black body radiation with the corresponding color temperature, and then a degree of similarity R of the equal energy spectrum of the white light emitting device and the equal energy spectrum of the black body radiation satisfies a following formula:

wherein

S′(λ)=S(λ)/k₁

k₁=Σ₄₃₀⁶⁵⁰S(λ)

Φ′(λ)=Φ(λ)/k₂

k₂=Σ₄₃₀⁶⁵⁰Φ(λ)

R≥85% when λi is 380 nm and λn is 680 nm;

wherein the white light emitting device emits light when phosphors are excited by a chip with a main emission peak of 380 nm-430 nm, wherein the phosphors consist of a blue phosphor with a main emission peak of 430 nm-500 nm and a FWHM of 20 nm-100 nm, a green phosphor with a main emission peak of 480 nm-550 nm and a FWHM of 20 nm-80 nm, and a red phosphor with a main emission peak of 600 nm-700 nm and a FWHM of 80 nm-120 nm.