LED MODULE AND ILLUMINATION DEVICE

• US 20130300282A1
• Filed: 08/29/2011
• Published: 11/14/2013
• Est. Priority Date: 02/03/2011
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Corporation (Panasonic Holdings Corporation)
• Inventors: Mori, Toshio, Tanaka, Hiromi
• Granted Patent: US 8,933,620 B2
• Time in Patent Office: Days
• US Class Current: 313/503
• CPC Class Codes: F21K 9/232 specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
• CPC Class Codes: F21K 9/27 Retrofit light sources for lighting devices with two fittings for each light source, e.g. for substitution of fluorescent tubes
• CPC Class Codes: F21K 9/64 using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
• CPC Class Codes: F21V 3/00 Globes; Bowls; Cover glasses with refracting properties F21V5/00; with reflecting properties F21V7/00; characterised by cooling arrangements F21V29/506
• CPC Class Codes: F21Y 2103/10 comprising a linear array of point-like light-generating elements
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 25/0753 the devices being arranged next to each other
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 33/504 Elements with two or more wavelength conversion materials

Abstract

Provided is an LED module and an illumination device having high color saturation, which improve vividness of color of an illuminated object even if color temperature of ambient light is high, and consequently are able to reproduce colors of the object as desired. Blue LEDs have peak wavelength of 420 nm to 470 nm and FWHM of greater than 0 nm and no greater than 50 nm. A green phosphor has peak wavelength of 500 nm to 535 nm and FWHM of 100 nm to 110 nm. A red phosphor has peak wavelength of 610 nm to 670 nm and FWHM of 85 nm to 95 nm. Mixed-color light of the blue, green and red light has correlated color temperature of 4600 K to 7200 K and Duv of −12 to −6.

Claims

1-8. -8. (canceled)

9. An LED module comprising:

a blue LED that emits blue light;

a green phosphor that absorbs a portion of the blue light emitted by the blue LED and emits green light; and

a red phosphor that absorbs at least one of a portion of the blue light emitted by the blue LED and a portion of the green light emitted by the green phosphor, and emits red light, wherein

a light-emission spectrum of the blue LED has a peak wavelength of no less than 420 nm and no greater than 470 nm, and a Full Width at Half Maximum (FWHM) of greater than 0 nm and no greater than 50 nm,

a light-emission spectrum of the green phosphor has a peak wavelength of no less than 500 nm and no greater than 535 nm, and an FWHM of no less than 100 nm and no greater than 110 nm,

a light-emission spectrum of the red phosphor has a peak wavelength of no less than 610 nm and no greater than 670 nm, and an FWHM of no less than 85 nm and no greater than 95 nm,

mixed-color light of the blue light, the green light and the red light has a correlated color temperature Tc of no less than 4600 K and no greater than 7200 K, and

the mixed-color light has a Distance from perfect radiator locus on uv coordinates (Duv) of no less than −

12 and no greater than −

6.

10. The LED module in claim 9, wherein

a difference Δ

λ

_R-G between the peak wavelength of the green phosphor and the peak wavelength of the red phosphor satisfies the following condition;

170 nm≧

Δ

λ

_R-G≧

Tc(0.006+0.0025(Duv+6))−

Duv×

10 nm.

11. The LED module in claim 9, wherein

the green phosphor is a YAG phosphor and the red phosphor is a CASN phosphor.

12. The LED module in claim 10, wherein

the green phosphor is a YAG phosphor and the red phosphor is a CASN phosphor.

13. An illumination device comprising:

a blue LED that emits blue light;

a green phosphor that absorbs a portion of the blue light emitted by the blue LED and emits green light; and

a red phosphor that absorbs at least one of a portion of the blue light emitted by the blue LED and a portion of the green light emitted by the green phosphor, and emits red light, wherein

a light-emission spectrum of the blue LED has a peak wavelength of no less than 420 nm and no greater than 470 nm, and a Full Width at Half Maximum (FWHM) of greater than 0 nm and no greater than 50 nm,

a light-emission spectrum of the green phosphor has a peak wavelength of no less than 500 nm and no greater than 535 nm, and an FWHM of no less than 100 nm and no greater than 110 nm,

a light-emission spectrum of the red phosphor has a peak wavelength of no less than 610 nm and no greater than 670 nm, and an FWHM of no less than 85 nm and no greater than 95 nm,

mixed-color light of the blue light, the green light and the red light has a correlated color temperature Tc of no less than 4600 K and no greater than 7200 K, and

the mixed-color light has a Distance from perfect radiator locus on uv coordinates (Duv) of no less than −

12 and no greater than −

6.

14. The illumination device in claim 13, wherein

a difference Δ

λ

_R-G between the peak wavelength of the green phosphor and the peak wavelength of the red phosphor satisfies the following condition;

170 nm≧

Δ

λ

_R-G≧

Tc(0.006+0.0025(Duv+6))−

Duv×

10 nm.

15. The illumination device in claim 13, wherein

the green phosphor is a YAG phosphor and the red phosphor is a CASN phosphor.

16. The illumination device in claim 14, wherein

the green phosphor is a YAG phosphor and the red phosphor is a CASN phosphor.