Semiconductor illuminating device

Patent metadata

Field	Value
Publication number	US-10141483-B2
Application number	US-201615549364-A
Country	US
Kind code	B2
Filing date	Jan 11, 2016
Priority date	Feb 6, 2015
Publication date	Nov 27, 2018
Grant date	Nov 27, 2018

Abstract

A semiconductor illuminating device is disclosed. The device includes an LED configured for emitting blue primary radiation and an LED phosphor arranged and configured such that it emits secondary light that forms at least one component of the illumination light, wherein the LED phosphor comprises a red phosphor for emitting red light as a component of the secondary light and a green phosphor for emitting green light as a component of the secondary light, wherein the green light has a color point located above a first straight line having a slope m 1 and a y-intercept n 1 in a CIE standard chromaticity diagram, with the slope m 1 =1.189 and the y-intercept n 1 =0.226, and wherein the components of the illumination light are at such a ratio to one another that the illumination light has a color temperature of at most 5500 K.

First claim

The invention claimed is:

1. A semiconductor illuminating device for emitting illumination light comprising:
an LED configured for emitting blue primary radiation; and
an LED phosphor arranged and configured such that it emits secondary light that forms at least one component of the illumination light,
wherein the LED phosphor comprises a red phosphor for emitting red light as a component of the secondary light and a green phosphor for emitting green light as a component of the secondary light, wherein the green light has a color point located above a first straight line having a slope m1 and a y-intercept n1 in a CIE standard chromaticity diagram, with the slope m1=1.189 and the y-intercept n1=0.226, and
wherein the components of the illumination light are at such a ratio to one another that the illumination light has a color temperature of at most 5500 K.

2. The semiconductor illuminating device according to claim 1 , wherein the illumination light has a color point which, in the CIE standard chromaticity diagram, is in a range that limits the Planckian curve upward and which extends downward to a distance of 15 threshold value units from the Planckian curve.

3. The semiconductor illuminating device according to claim 1 , wherein the green light has a color point which, in the CIE standard chromaticity diagram, is located above a second straight line having a slope m2 and a y-intercept n2, and wherein the slope m2=−0.833 and the y-intercept n2=0.692.

4. The semiconductor illuminating device according to claim 3 , wherein the color point of the green light, in the CIE standard chromaticity diagram, is located in a rectangle spanned by four (x/y)-value pairs, and wherein the (x/y)-value pairs are: (0.352/0.645), (0.25/0.73), (0.17/0.55) and (0.23/0.5).

5. The semiconductor illuminating device according claim 1 , wherein the green light has a dominant wavelength ΛDom of at least 515 nm and at most 555 nm with a full width at half maximum of at most 85 nm.

6. The semiconductor illuminating device according to claim 1 , wherein the color point of the red light, in the CIE standard chromaticity diagram, is located in a rectangle spanned by four (x/y)-value pairs, and wherein the (x/y)-value pairs are: (0.68/0.325), (0.61/0.39), (0.6/0.38) and (0.67/0.315).

7. The semiconductor illuminating device according to claim 1 , wherein the red light has a peak wavelength Λpeak of at least 630 nm and at most 645 nm with a full width at half maximum of at most 100 nm.

8. The semiconductor illuminating device according to claim 1 , wherein the illumination light has a color rendering index of at least 80.

9. The semiconductor illuminating device according to claim 1 , wherein the green phosphor comprises an orthosilicate phosphor, a nitride-orthosilicate phosphor and/or a β-SiAlON phosphor.

10. The semiconductor illuminating device according to claim 1 , wherein the primary radiation emitted by the LED is blue light, which forms a component of the illumination light.

11. The semiconductor illuminating device according to claim 1 , further comprising a plurality of LEDs configured to emit blue primary radiation, wherein each LED is installed in the semiconductor illuminating device as an LED chip, and wherein the LEDs are housed together with a filler material.

12. The semiconductor illuminating device according to claim 1 , wherein the illumination light has an FCI value of at least 130 when the color temperature is less than 3000 K, and has an FCI value located above a straight line FCI=mFCI·T+nFCI having a slope mFCI and an y-intercept nFCI, with the color temperature plotted on the x-axis, wherein mFCI=−0.006 and nFCI=148 when the color temperature is at least 3000 K.

13. The semiconductor illuminating device according to claim 1 , wherein the molecular formula for the green phosphor is AE 2-x L x SiO 4-x N x :RE and/or AE 2-x L x Si 1-y O 4-x-2y N x :RE and/or AE 2 SiO 4 :RE, wherein AE contains one or more elements selected from Mg, Ca, Sr, or Ba, wherein RE contains at least Eu, and wherein L contains one or more element(s) selected from rare earth metals different from RE, with 0<x≤0.1, and 0<y≤0.1.

14. A lighting device comprising:
a semiconductor illuminating device according to claim 1 ; and
a base to which the semiconductor illuminating device is electrically connected,
wherein the base is an Edison screw base, a shell base, a tube base or a bayonet base.

15. A semiconductor illuminating device for emitting illumination light comprising:
a LED configured to emit blue primary radiation; and
a LED phosphor arranged and configured to emit secondary light that forms at least one component of the illumination light,
wherein the LED phosphor comprises a red phosphor for emitting red light as a component of the secondary light and a green phosphor for emitting green light as a component of the secondary light, wherein the green light has a color point located above a first straight line having a slope m1 and a y-intercept n1 in a CIE standard chromaticity diagram, with the slope m1=1.189 and the y-intercept n1=0.226,
wherein components of the illumination light are at such a ratio to one another that the illumination light has a color temperature of at most 5500 K, and
wherein the red light has a peak wavelength Λ peak of at least 630 nm and at most 645 nm with a full width at half maximum of at most 100 nm.

16. A lighting device comprising:
a semiconductor illuminating device according to claim 1 ; and
a base to which the semiconductor illuminating device is electrically connected,
wherein the base is a plug base.

17. A lighting device comprising:
a semiconductor illuminating device according to claim 1 ; and
a base to which the semiconductor illuminating device is electrically connected,
wherein the base is a pin base.

18. A lighting device comprising:
a semiconductor illuminating device according to claim 1 ; and
a base to which the semiconductor illuminating device is electrically connected,
wherein the base is a screw base.

Assignees

• Osram Opto Semiconductors Gmbh

Inventors

• Baur Elmar
• Windisch Reiner
• Baumann Frank

Classifications

• C09K11/646

  Silicates · CPC title

• C09K11/0883

  Arsenides; Nitrides; Phosphides · CPC title

• F21K9/23

  Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings · CPC title

• H10W90/753

  between laterally-adjacent chips · CPC title

• H10W90/00

  Package configurations · CPC title