Phosphor, manufacture thereof; light-emitting device, and image display device utilizing phosphor

Patent metadata

Field	Value
Publication number	US-9359551-B2
Application number	US-201213690453-A
Country	US
Kind code	B2
Filing date	Nov 30, 2012
Priority date	Nov 7, 2011
Publication date	Jun 7, 2016
Grant date	Jun 7, 2016

Abstract

Provided is a chemically and thermally stable phosphor having different emission characteristics than the conventional phosphor and exhibiting high emission intensity if combined with an LED of 470 nm or less. The phosphor of the present invention is represented by a composition formula: M d A e D f E g X h (d+e+f+g+h=1; M is one or more kinds of elements selected from Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, and Yb; A is one or more kinds of elements selected from Mg, Ca, Sr, and Ba; D is one or more kinds of elements selected from Si, Ge, Sn, Ti, Zr, and Hf; E is one or more kinds of elements selected from B, Al, Ga, In, Sc, Y, and La; and X is one or more kinds of elements selected from O, N, and F) and parameters d, e, f, g, and h satisfy the predetermined condition.

First claim

What is claimed is:

1. A phosphor comprising: an inorganic compound wherein the inorganic compound is expressed by a compositional formula of M d A e D f E g X h (where d+e+f+g+h=1; an M element is one or more kinds of elements selected from the group consisting of Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, and Yb; an A element is one or more kinds of elements selected from the group consisting of Mg, Ca, Sr, and Ba; a D element is one or more kinds of elements selected from the group consisting of Si, Ge, Sn, Ti, Zr, and Hf; an E element is one or more kinds of elements selected from the group consisting of B, Al, Ga, In, Sc, Y, and La; and an X element is one or more kinds of elements selected from the group consisting of O, N, and F,) and parameters d, e, f, g, and h satisfy following condition:
0.00001≦ d≦ 0.05;

0.05≦ e≦ 0.1;

0.07≦ f≦ 0.3;

0.07≦ g≦ 0.3; and

0.45≦ h≦ 0.6

wherein the inorganic compound comprises: an inorganic crystal constituted of a crystal expressed by Sr 1 SiAl 2 O 4 N 4 , another inorganic crystal having a same crystal structure as the crystal expressed by the Sr 1 Si 3 Al 2 O 4 N 4 , or a solid-solution crystal thereof, into which an M element is solid-solved wherein M is one or more kinds of elements selected from the group consisting of Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, and Yb.

2. The phosphor according to claim 1 , comprising the inorganic compound satisfying a relationship of:
0.5/5≦( d+e )/( f+g )≦2/5

in the composition formula.

3. The phosphor according to claim 2 , comprising the inorganic compound satisfying a relationship of:
0.9/5≦( d+e )/( f+g )≦1.2/5

in the composition formula.

4. The phosphor according to claim 1 ,
wherein values of the parameters d, e, f, g, and h of the composition formula are within a range satisfy all conditions of:
0.06≦ d+e ≦(1/14)+0.05;

(5/14)−0.05≦ f+g ≦(5/14)+0.05; and

(8/14)−0.05≦ h≦ 0.6.

5. The phosphor according to claim 1 , comprising the inorganic compound having the composition formula in which the parameters f and g satisfy a condition of:
2/5≦ f /( f+g )≦4/5.

6. The phosphor according to claim 1 , comprising the inorganic compound having a composition formula of M d A e D f E O h1 N h2 (wherein, d+e+f+g+h1+h2=1 and h1+h2=h in the formula),
wherein the X element includes N and O and a condition of:
2/8≦ h 1/( h 1 +h 2)≦6/8

is satisfied.

7. The phosphor according to claim 6 , comprising the inorganic compound satisfying a condition of:
3.5/8≦ h 1/( h 1 +h 2)≦4.5/8

in the composition formula.

8. The phosphor according to claim 1
wherein at least Eu is included as the M element.

9. The phosphor according to claim 1 ,
wherein at least Sr and/or Ba is included as the A element, at least Si is included as the D element, at least Al is included as the E element, and at least N and O are included as the X element.

10. The phosphor according to claim 9 ,
wherein at least Sr and Ba are included as the A element.

11. The phosphor according to claim 9 ,
wherein 0.001 mass % or more and 1 mass % or less of boron is included as the E element.

12. The phosphor according to claim 1 ,
wherein the inorganic compound includes a single crystal particle or an aggregate thereof having a mean particle diameter equal to or more than 0.1 μm and equal to or less than 20 μm.

13. The phosphor according to claim 1 ,
wherein a sum of Fe, Co, and Ni impurity elements included in the inorganic compound does not exceed 500 ppm.

14. The phosphor according to claim 1 , further comprising an amorphous phase or a crystal phase that is different from the inorganic compound in addition to the inorganic compound,
wherein a content amount of the inorganic compound is equal to or more than 20 mass %.

15. The phosphor according to claim 14 ,
wherein the amorphous phase or the crystal phase that is different from the inorganic compound is inorganic substance having electronic conductivity.

16. The phosphor according to claim 15 ,
wherein the inorganic substance having the electrical conductivity is oxide, oxynitride, nitride, or a combination thereof, any one of which includes one or more kinds of elements selected from a group consisting of Zn, Al, Ga, In, and Sn.

17. The phosphor according to claim 14 ,
wherein the amorphous phase or the crystal phase that is different from the inorganic compound is another phosphor.

18. The phosphor according to claim 1 ,
wherein the phosphor emits fluorescent having a peak in a wavelength range of 440 nm to 520 nm upon irradiation of an excitation source.

19. The phosphor according to claim 18 ,
wherein the excitation source is a vacuum ultraviolet ray, an ultraviolet ray, or visible light, each of which has a wavelength that is in each specific range among from 100 nm to 420 nm, or an electron beam or an X-ray.

20. The phosphor according to claim 1 ,
wherein a color of light emitted upon irradiation of an excitation source satisfies, in terms of values of (x, y) of CIE 1931 chromaticity coordinates, conditions:
0.05≦ x≦ 0.3; and

0.02≦ y≦ 0.4.

21. The phosphor according to claim 1 ,
wherein, in the composition formula, the M element is Eu; the D element is Si; the E element is Al; and the X element is O and N, and
wherein the inorganic compound comprises an inorganic compound consisting of a crystal in which Eu is solid-solved and the crystal is expressed by
A 1 Si 3−x Al 2+x O 4+x N 4−x ,

wherein −1≦x≦2.

22. The phosphor according to claim 21 ,
wherein the A element is a combination of Sr and Ba.

23. The phosphor according to claim 22 ,
wherein the inorganic crystal is expressed, using parameters x and y, by:
Eu y (Sr,Ba) 1 Si 3−x Al 2+x O 4+x N 4−x

wherein −1≦x≦2, and 0.0001≦y≦0.5.

24. The phosphor according to claim 21 ,
wherein the x is equal to 0.

25. The phosphor according to claim 21 , wherein:
the A element is a combination of Sr and Ba,
the x is equal to 0, and
fluorescence of a blue color having 440 nm or more and 520 nm or less is emitted upon irradiation of light having 295 to 420 nm.

26. The phosphor according to claim 1 ,
wherein the inorganic crystal having the same crystal structure as the crystal expressed by Sr 1 Si 3 Al 2 O 4 N 4 is a crystal expressed by A 1 SiAl 2 O 4 N 4 or A 1 (D, E) 5 X 8 .

27. The phosphor according to claim 26 ,
wherein the A element includes either or both of Sr and Ba, the D element includes Si, the E element includes Al, X element includes N, and the X element further includes O if necessary.

28. The phosphor according to claim 1 ,
wherein the inorganic crystal having the same crystal structure as the crystal expressed by Sr 1 SiAl 2 O 4 N 4 is a crystal expressed by (Ba, Sr) 1 Si Al 2 O 4 N 4 .

29. A method of manufacturing a phosphor comprising: the step of
firing a raw material mixture of metal compounds in a temperature range of 1,200° C. or higher to 2,200° C. or lower in an inert atmosphere including nitrogen
wherein the phosphor comprises: an inorganic compound expressed by a compositional formula of M d A e D f E g X h (where d+e+f+g+h=1; an M element is one or more kinds of elements selected from the group consisting of Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, and Yb; an A element is one or more kinds of elements selected from the group consis

Assignees

• Hirosaki Naoto
• Takeda Takashi
• Funahashi Shiro
• Nat Inst For Materials Science

Inventors

• Hirosaki Naoto
• Takeda Takashi
• Funahashi Shiro

Classifications

• H10W90/756

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

• H10W74/00

  Encapsulations, e.g. protective coatings · CPC title

• H10W72/5522

  comprising gold [Au] · CPC title

• H10W72/01515

  Forming coatings · CPC title

• H10W72/884

  Die-attach connectors and bond wires · CPC title