# US 11,898,712 B2 · White light emitting device, light bar and light apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,898,712 B2 - Document ID: US11898712B2 - Status: Granted - Kind: B2 - Application number: 17/607,045 - Filed: 2019-12-12 - Published: 2022-07-07 - Granted: 2024-02-13 - Earliest claimed: 2019-04-29 - Assignees: Foshan Nationstar Optoelectronics Co., Ltd. - Applicants: Foshan Nationstar Optoelectronics Co., Ltd. - Inventors: Jinhui Zhang; Yikai Yuan; Long Zhao; Chuyi Li; Cheng Li - Web page: https://patentgrep.com/patent/US11898712B2 ## CPC - C09K 11/7734: {Aluminates} - F21S 4/28: rigid, e.g. LED bars - C09K 11/665: {with alkali or alkaline earth metals} - C09K 11/7721: {Aluminates} - C09K 11/7731: {with alkaline earth metals} - C09K 11/7739: {with halogens} - F21V 9/30: Elements containing photoluminescent material distinct from or spaced from the light source (shades F21V1/17; globes, bowls or cover glasses F21V3/08, F21V3/12; refractors F21V5/10; reflectors F21V7/26, F21V7/30; elements with provision for controlling the spectral properties or intensity F21V9/40) - H10H 20/8513: {having two or more wavelength conversion materials} - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE - F21S: NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS - F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR - H10H: INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS ## Abstract A white light emitting device, a light bar and a light apparatus. A relative spectrum of the white light emitting device is ϕ(λ). A relative spectrum of a black body radiation with a corresponding color temperature is S(λ). 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. 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 the following formula: R = 1 - Σ λ ⁢ ⁢ i λ ⁢ n ⁢  S ′ ⁡ ( λ ) - Φ ′ ⁡ ( λ )  Σ λ ⁢ i λ ⁢ n ⁢ S ′ ⁡ ( λ ) , when λi is 380 nm, λn is 680 nm, R≥85%. ## Claims ### Claim 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: R = 1 - Σ λ ⁢ i λ ⁢ n ⁢  S ′ ⁡ ( λ ) - Φ ′ ⁡ ( λ )  Σ λ ⁢ i λ ⁢ n ⁢ S ′ ⁡ ( λ ) 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. ### Claim 2 (depends on 1) The white light emitting device as claimed in claim 1, wherein R≥90% when λi is 430 nm and λn is 650 nm. ### Claim 3 (depends on 2) The white light emitting device as claimed in claim 2, wherein R≥95% when λi is 430 nm and λn is 650 nm. ### Claim 4 (depends on 1) The white light emitting device as claimed in claim 1, wherein R≥80% when λi is 465 nm and λn is 495 nm. ### Claim 5 (depends on 1) The white light emitting device as claimed in claim 1, wherein the blue phosphor is aluminate, chlorophosphate or silicate, the green phosphor is on/nitride, silicate or aluminate; and the red phosphor is nitride, sulfide or fluoride. ### Claim 6 (depends on 5) The white light emitting device as claimed in claim 5, wherein the blue phosphor is BaMgAl10O17:Eu2+, BaAl12O9:Eu2+, Sr5(PO4)3Cl:Eu2+, Ba5(PO4)3Cl:Eu2+, RbNa3(Li3SiO4)4:Eu2+ or MgSr3Si2O8:Eu2+. ### Claim 7 (depends on 5) The white light emitting device as claimed in claim 5, wherein the green phosphor is SiAlON:Eu2+, BaSiON2:Eu2+, Ba2SiO4:Eu2+ or LuAG. ### Claim 8 (depends on 5) The white light emitting device as claimed in claim 5, wherein the red phosphor is CaAlSiN3:Eu2+, (Ca1-xSrx)AlSiN3:Eu2+, Ca2Si5N8:Eu2+, Sr2Si5N8:Eu2+, Ba2Si5N8:Eu2+, CaS:Eu2+ or MgGeF6:Mn4+. ### Claim 9 (depends on 1) A light bar, comprising a substrate, wherein at least one white light emitting device as claimed in claim 1 is arranged on the substrate. ### Claim 10 (depends on 9) A light apparatus, comprising a housing, wherein the light bar as claimed in claim 9 is mounted in the housing. ### Claim 11 (depends on 1) A light apparatus, comprising a housing, wherein the white light emitting device as claimed in claim 1 is mounted in the housing. ### Claim 12 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 Mite 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: R = 1 - ∑ λ ⁢ i λ ⁢ n | S ′ ( λ ) - Φ ′ ( λ ) | ∑ λ ⁢ i λ ⁢ n ⁢ S ′ ( λ ) 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, a yellow phosphor with a main emission peak of 540 nm-600 nm and a FWHM of 60 nm-120 nm, and a red phosphor with a main emission peak of 600 nm-700 nm and a FWHM of 80 nm-120 nm. ### Claim 13 (depends on 12) The white light emitting device as claimed in claim 12, wherein the blue phosphor is aluminate, chlorophosphate or silicate; the green phosphor is oxynitride, silicate or aluminate; the yellow phosphor is aluminate, silicate or nitride; and the red phosphor is nitride, sulfide or fluoride. ### Claim 14 (depends on 13) The white light emitting device as claimed in claim 13, wherein the yellow phosphor is Ga-YAG, Sr2SiO4:Eu2+, (BaSr)2SiO4:Eu2+ or La3Si6N11:Ce3+. ### Claim 15 (depends on 13) The white light emitting device as claimed in claim 13, wherein the blue phosphor is BaMgAl10O17:Eu2+, BaAl12O9:Eu2+, Sr5(PO4)3Cl:Eu2+, Ba5(PO4)3Cl:Eu2+, RbNa3(Li3SiO4)4:Eu2+ or MgSr3Si2O8:Eu2+. ### Claim 16 (depends on 13) The white light emitting device as claimed in claim 13, wherein the green phosphor is SiAlON:Eu2+, BaSiON2:Eu2+, Ba2SiO4:Eu2+ or LuAG. ### Claim 17 (depends on 13) The white light emitting device as claimed in claim 13, wherein the red phosphor is CaAlSiN3:Eu2+, (Ca1-xSrx)AlSiN3:Eu2+, Ca2Si5N8:Eu2+, Sr2Si5N8:Eu2+, Ba2Si5N8:Eu2+, CaS:Eu2+ or MgGeF6:Mn4+.