White light emitting device, light bar and light apparatus

Patent metadata

Field	Value
Publication number	US-11898712-B2
Application number	US-201917607045-A
Country	US
Kind code	B2
Filing date	Dec 12, 2019
Priority date	Apr 29, 2019
Publication date	Feb 13, 2024
Grant date	Feb 13, 2024

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%.

First claim

What is claimed is:

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)/k 1
k 1 =Σ 430 650 S(λ)
Φ′(λ)=Φ(λ)/k 2
k 2 =Σ 430 650 Φ(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.

2. The white light emitting device as claimed in claim 1 , wherein R≥90% when λi is 430 nm and λn is 650 nm.

3. The white light emitting device as claimed in claim 2 , wherein R≥95% when λi is 430 nm and λn is 650 nm.

4. The white light emitting device as claimed in claim 1 , wherein R≥80% when λi is 465 nm and λn is 495 nm.

5. 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.

6. The white light emitting device as claimed in claim 5 , wherein the blue phosphor is BaMgAl 10 O 17 :Eu 2+ , BaAl 12 O 9 :Eu 2+ , Sr 5 (PO 4 ) 3 Cl:Eu 2+ , Ba 5 (PO 4 ) 3 Cl:Eu 2+ , RbNa 3 (Li 3 SiO 4 ) 4 :Eu 2+ or MgSr 3 Si 2 O 8 :Eu 2+ .

7. The white light emitting device as claimed in claim 5 , wherein the green phosphor is SiAlON:Eu 2+ , BaSiON 2 :Eu 2+ , Ba 2 SiO 4 :Eu 2+ or LuAG.

8. The white light emitting device as claimed in claim 5 , wherein the red phosphor is CaAlSiN 3 :Eu 2+ , (Ca 1-x Sr x )AlSiN 3 :Eu 2+ , Ca 2 Si 5 N 8 :Eu 2+ , Sr 2 Si 5 N 8 :Eu 2+ , Ba 2 Si 5 N 8 :Eu 2+ , CaS:Eu 2+ or MgGeF 6 :Mn 4+ .

9. A light bar, comprising a substrate, wherein at least one white light emitting device as claimed in claim 1 is arranged on the substrate.

10. A light apparatus, comprising a housing, wherein the light bar as claimed in claim 9 is mounted in the housing.

11. A light apparatus, comprising a housing, wherein the white light emitting device as claimed in claim 1 is mounted in the housing.

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)/k 1

Assignees

• Foshan Nationstar Optoelectronics Co Ltd

Inventors

• Zhang Jinhui
• Yuan Yikai
• Zhao Long
• Li Chuyi
• Li Cheng

Classifications

• H10H20/8513

  having two or more wavelength conversion materials · CPC title

• F21S4/28 Primary

  rigid, e.g. LED bars · CPC title

• F21V9/30

  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) · CPC title

• F21K9/00 Primary

  Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers · CPC title

• C09K11/7734 Primary

  Aluminates · CPC title