Lighting device comprising a primary radiation source and a first phosphor

Patent metadata

Field	Value
Publication number	US-9719014-B2
Application number	US-201615213174-A
Country	US
Kind code	B2
Filing date	Jul 18, 2016
Priority date	Oct 8, 2013
Publication date	Aug 1, 2017
Grant date	Aug 1, 2017

Abstract

A phosphor is disclosed. In an embodiment a phosphor includes an inorganic substance which includes, in its composition, at least an element D, an element Al, an element AX, an element SX and an element NX where D includes one, two or more elements selected from the group consisting of Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, alkali metals and Yb, Al includes one, two or more elements selected from the group consisting of divalent metals not included in D, SX includes one, two or more elements selected from the group consisting of tetravalent metals, AX includes one, two or more elements selected from the group consisting of trivalent metals, and NX includes one, two or more elements selected from the group consisting of O, N, S, C, Cl, and F, wherein the inorganic substance has the same crystal structure as Sr(Sr a Ca 1−a )Si 2 Al 2 N 61 .

First claim

What is claimed is:

1. A lighting device comprising:
a primary radiation source configured to emit primary radiation in a wavelength range between 300 nm and 570 nm; and
a first phosphor disposed in a beam path of the primary radiation source, the first phosphor configured to convert at least a portion of the primary radiation to a secondary radiation within an orange to red wavelength range from 570 nm to 800 nm, wherein the first phosphor includes an inorganic substance which includes, in its composition, at least an element D, an element Al, an element AX, an element SX and an element NX,
wherein the element D is one or more elements selected from the group consisting of Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, alkali metals and Yb,
wherein the element Al is one or more elements selected from divalent metals not included in D,
wherein the element SX is one or more elements selected from tetravalent metals,
wherein the element AX is one or more elements selected from trivalent metals,
wherein the element NX is one or more elements selected from the group consisting of O, N, S, C, Cl and F, and
wherein the inorganic substance has the same crystal structure as Sr(Sr a Ca 1−a )Si 2 Al 2 N 6 and crystallizes in space groups P1, P2, P 1 or P2 1 .

2. The lighting device according to claim 1 , wherein the first phosphor has the formula:
A1(A1 a M 1−a )SX 2 AX 2 NX 6 :D,
wherein M is a divalent metallic element different from those of element A1, and
wherein a parameter a is between 0.6 and 1.0.

3. The lighting device according to claim 1 , further comprising a second phosphor which is disposed in the beam path of the primary radiation source and has a different emission than the first phosphor.

4. The lighting device according to claim 3 , wherein the second phosphor includes the elements M, A, D, E, and X,
wherein the element M is one or more elements selected from the group consisting of Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, and Yb,
wherein the element A is one or more elements selected from divalent metal elements other than those of element M,
wherein the element D is one or more elements selected from tetravalent metal elements,
wherein the element E is one or more elements selected from trivalent metal elements,
wherein the element X is one or more elements selected from the group consisting of O, N, and F, and
wherein the second phosphor has the same crystal structure as CaAlSiN 3 .

5. The lighting device according to claim 3 , wherein the second phosphor has the formula:
(Gd,Lu,Tb,Y) 3 (Al,Ga,D) 5 (O,X) 12 :RE
or
(Gd,Lu,Tb,Y) 3 (Al,Ga) 5 (O) 12 :RE,
wherein element X is selected from a halide, N or a divalent element,
wherein element D is selected from a trivalent element or a tetravalent element, and
wherein RE is selected from rare earth metals as activators.

6. The lighting device according to claim 5 , further comprising a secondary radiation source with phosphors disposed in the beam path thereof that convert the primary radiation thereof to a secondary radiation, wherein mixing of the secondary radiation of the first and second radiation sources results in an overall emission of radiation from the lighting device, and wherein the lighting device comprises a flash.

7. The lighting device according to claim 6 , wherein a color range of the converted radiation from the second radiation source is different than a color range of the converted radiation from the first radiation source.

8. The lighting device according to claim 7 , wherein the first and second radiation sources can be operated with different currents and a color range of the overall emission radiation from the lighting device can be established via different currents for the first and second radiation sources.

9. The lighting device according to claim 7 , wherein an optical element arranged downstream of the phosphors of the first and second radiation sources mixes the secondary radiation from the first and second radiation sources to produce the overall emission of radiation.

10. The lighting device according to claim 3 , wherein the second phosphor has the formula:
(Gd,Lu,Tb,Y) 3 (Al,Ga,D) 5 (O,X) 12 :RE
wherein element X is selected from a halide or a divalent element,
wherein element D is selected from a trivalent element or a tetravalent element,
wherein RE is selected from rare earth metals as activators,
wherein the second phosphor is disposed in the beam path of the primary radiation source, and
wherein the lighting device is configured to provide a flash.

11. The lighting device according to claim 10 , wherein the second phosphor has the formula:
Lu 3 (Al 1−x Ga x ) 5 O 12 :Ce or (Lu,Y) 3 (Al 1−x Ga x ) 5 (O) 12 :Ce,
wherein a cerium content is of 0.5-5 mol % based on the rare earth metals, and
wherein a gallium content x is between 0 and 0.5.

12. The lighting device according to claim 3 , wherein the second phosphor has the formula:
(Gd,Y) 3 (Al 1−x Ga x ) 5 O 12 :Ce or (Tb,Y) 3 (Al 1−x Ga x ) 5 (O) 12 :Ce,
wherein a cerium content is of 1.5-5 mol %,
wherein a gallium content x is of 0 to 0.5, and
wherein the lighting device comprises a flash.

13. The lighting device according to claim 3 , wherein the first phosphor has the formula:
Sr(Sr a Ca 1−a )Si 2 Al 2 N 6 :D,
wherein a parameter a is 0.7≦a,
wherein the second phosphor is a garnet of the formula:
((Gd,Lu,Y;Tb) 3 (Al,Ga) 5 (O) 12 :RE,

wherein RE is selected from a rare earth metal, and
wherein the lighting device is configured to produce a white light having a CRI≧80.

14. The lighting device according to claim 13 , wherein the second phosphor has the formula:
Y 3 (Al 1−x Ga x ) 5 (O) 12 :Ce, and
wherein a proportion of Ga is 0.2≦x≦0.6.

15. The lighting device according to claim 3 , wherein the primary radiation source emits the primary radiation in the wavelength range between 430 nm and 470 nm,
wherein the second phosphor is a garnet of the formula:
(Gd,Lu,Y,Tb) 3 (Al,Ga) 5 (O) 12 :RE
or
(Lu,Y) 3 (Al,Ga) 5 (O) 12 :RE,

wherein RE is selected from a rare earth metal, and
wherein the lighting device is configured to produce a white light having a CRI≧90.

16. The lighting device according to claim 15 , wherein the element M in the first phosphor is Sr and Ca and a parameter a is as follows: 0.7≦a, and wherein a proportion of an activator D is ≧1.5%.

17. The lighting device according to claim 3 , wherein the second phosphor is selected from at least one phosphor from the following phosphors:
a beta-SiAlON of the formula: Si 6−z Al z O z N 8−z :Eu with 0<z≦4,
nano-semiconductor materials as quantum dots,
nitridoorthosilicates of a general composition AE 2−x RE x SiO 4−x N x :Eu,
wherein AE is selected from the group consisting of Sr, Ca, Ba and Mg,
wherein RE is selected from rare earth metals, or of the general composition AE 2−x RE x Si 1−y O 4−x−2y N x :Eu.

18. The lighting device according to claim 3 , wherein the first phosphor has the formula:
Sr(Sr a Ca 1−a )Si 2 Al 2 N 6 :D,
wherein a is 0.7≦a,
wherein a proportion of the activator D is ≧2 mol %,
wherein the second phosphor has the formula:
Y 3 (Al 1−x Ga x ) 5 O 12 :Ce with 0.2≦x≦0.6 or Lu 3 (Al 1−x Ga x )O 12 :Ce with 0≦x≦0.6

wherein a cerium content is of 0.5-5 mol % based on rare earth metals, and
wherein the lighting device is configured to provide backlighting.

19. The lighting device according to claim 3 , wherein the first phosphor has the formula:
Sr(Sr a Ca 1−a )Si 2 Al 2 N 6 :D,
where

Assignees

• Osram Opto Semiconductors Gmbh
• Osram Gmbh

Inventors

• Fiedler Tim
• Bichler Daniel
• Lange Stefan
• Römer Rebecca
• Jermann Frank
• Thienel Frauke
• Huckenbeck Barbara
• Baumgartner Alexander
• Stöppelkamp Vera
• Bönisch Norbert
• Cui Hailing

Classifications

• H10W90/756

  between a chip and a stacked lead frame, conducting package substrate or heat sink · CPC title

• H10W72/884

  Die-attach connectors and bond wires · CPC title

• C09K11/646 Primary

  Silicates · CPC title

• C09K11/7728

  containing europium · CPC title

• C09K11/0883

  Arsenides; Nitrides; Phosphides · CPC title