PHOSPHOR, PRODUCTION METHOD THEREOF, PHOSPHOR-CONTAINING COMPOSITION, LIGHT EMITTING DEVICE, AND DISPLAY AND ILLUMINATING DEVICE

• US 20100090585A1
• Filed: 09/29/2009
• Published: 04/15/2010
• Est. Priority Date: 03/30/2007
• Status: Abandoned Application

• Current Assignee: Mitsubishi Chemical Corporation (Mitsubishi Chemical Group Corp.)
• Original Assignee: Mitsubishi Chemical Corporation (Mitsubishi Chemical Group Corp.)
• Inventors: SHIMIZU, Kumie, SHIMIZU, Etsuo, KIJIMA, Naoto, SETO, Takatoshi
• Application Number:
  US12/569,105
• Publication Number:
  US 20100090585A1
• Time in Patent Office: Days
• US Class Current: 313/503
• CPC Class Codes: C04B 2235/3206 Magnesium oxides or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3213 Strontium oxides or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3215 Barium oxides or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3217 Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
• CPC Class Codes: C04B 2235/3224 Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
• CPC Class Codes: C04B 2235/3262 Manganese oxides, manganates, rhenium oxides or oxide-forming salts thereof, e.g. MnO
• CPC Class Codes: C04B 2235/3852 Nitrides, e.g. oxynitrides, carbonitrides, oxycarbonitrides, lithium nitride, magnesium nitride
• CPC Class Codes: C04B 2235/3865 Aluminium nitrides
• CPC Class Codes: C04B 2235/3873 Silicon nitrides, e.g. silicon carbonitride, silicon oxynitride
• CPC Class Codes: C04B 2235/445 Fluoride containing anions, e.g. fluosilicate
• CPC Class Codes: C04B 35/16 based on silicates other than clay zircon C04B35/48
• CPC Class Codes: C04B 35/44 based on aluminates
• CPC Class Codes: C04B 35/581 based on aluminium nitride
• CPC Class Codes: C04B 35/584 based on silicon nitride
• CPC Class Codes: C04B 35/597 based on silicon oxynitride, e.g. SIALONS
• CPC Class Codes: C04B 35/6262 of calcined, sintered clinker or ceramics
• CPC Class Codes: C09K 11/7734 Aluminates
• CPC Class Codes: H01L 2224/45015 being circular
• CPC Class Codes: H01L 2224/45144 Gold (Au) as principal constituent
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48247 : connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 2924/00012 : Relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• 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 2924/181 : Encapsulation
• CPC Class Codes: H01L 2924/20752 : larger or equal to 20 microns less than 30 microns
• CPC Class Codes: H01L 33/502 : Wavelength conversion materials
• CPC Class Codes: H01S 5/0087 : for illuminating phosphorescent or fluorescent materials, e.g. using optical arrangements specifically adapted for guiding or shaping laser beams illuminating these materials
• CPC Class Codes: H01S 5/18386 : Details of the emission surface for influencing the near- or far-field, e.g. a grating on the surface
• CPC Class Codes: H01S 5/32341 : blue laser based on GaN or GaP

Abstract

To provide a phosphor that stably shows high emission intensity and brightness as well as superior temperature characteristics, under excitation by near-ultraviolet light, the phosphor contains an alkaline-earth metal aluminate and has a crystal phase comprising an alkali metal element and, in that crystal phase, the rate of substituted Eu (europium) to the number of sites which can be substituted with Eu of the crystal phase is 25% or higher and the ratio of the alkali metal element to the number of sites which can be substituted with Eu of the crystal phase is 3% or lower.

Claims

1. A phosphor containing an alkaline-earth metal aluminate, having a crystal phase comprising an alkali metal element, wherein:

a rate of substituted Eu (europium) to the number of sites which can be substituted with Eu of said crystal phase is 25% or higher; and

a ratio of said alkali metal element to the number of sites which can be substituted with Eu of said crystal phase is 3% or lower.

2. A phosphor according to claim 1 wherein,

said phosphor has β

-alumina structure.

3. A phosphor according to claim 1 wherein,

said phosphor has an emission peak in the wavelength region between 470 nm and 570 nm when excited with light in a wavelength range between 380 nm and 410 nm.

4. A phosphor according to claim 1 wherein,

said phosphor has an emission peak in the wavelength region between 420 nm and 470 nm when excited with light in a wavelength range between 380 nm and 410 nm.

5. A phosphor according to claim 1, wherein

the full width at half maximum of the emission peak is 60 nm or smaller.

6. A phosphor according to claim 1

further containing Mn (manganese).

7. A phosphor according to claim 1

further containing Mg (magnesium).

8. A phosphor according to claim 6

further containing Mg (magnesium).

9. A phosphor according to claim 1

represented by the formula [1] below.

(1−

a)Ba<sub>(1−

b−

c−

d)</sub>Sr_bCa_cEu_dMg<sub>(1−

e−

f)</sub>Zn_eMn_fAl_gO_h.(a)Ba<sub>(0.75−

b′

−

c′

−

d′

)</sub>Sr_b′

Ca_c′

Eu_d′

Al₁₁O_17.25.A_i 

 

[1]

(Where

A represents at least one kind of alkali metal element, and

a, b, c, d, e, f, g, h, i, b′

, c′

, and d′

represent numbers satisfying the following conditions;

0≦

a≦

1,

0≦

b<

1,

0≦

c<

1,

0.1<

d<

1,

0≦

e<

1,

0≦

f≦

1,

9≦

g≦

11,

15.3≦

h≦

18.7,

0<

i≦

0.03,

0≦

b′

<

1,

0≦

c′

<

1, and

0.1<

d′

<

1.)

16. A phosphor-containing composition comprising:

said phosphor according to claim 1 and a liquid medium.

17. A light emitting device comprising:

a first luminous body and a second luminous body which emits visible light when irradiated with light from said first luminous body, wherein

said second luminous body comprises, as a first phosphor, at least one kind of said phosphor according to claim 1.

18. A light emitting device according to claim 17, wherein

said second luminous body comprises, as a second phosphor, at least one kind of a phosphor of which luminous wavelength is different from that of said first phosphor.

19. A light emitting device according to claim 18, wherein

said first luminous body has an emission peak in the wavelength range of 300 nm or longer and 420 nm or shorter, and

said second luminous body comprises, as the second phosphor, at least one kind of a phosphor having an emission peak in the wavelength range of 530 nm or longer and 780 nm or shorter.

20. A light emitting device according to claim 18, wherein

said first luminous body has an emission peak in the wavelength range of 300 nm or longer and 420 nm or shorter, and

said second luminous body comprises, as the second phosphor, at least one kind of a phosphor having an emission peak in the wavelength range of longer than 420 nm and 490 nm or shorter and at least one kind of a phosphor having an emission peak in the wavelength range of 570 nm or longer and 780 nm or shorter.

21. A light emitting device according to claim 18, wherein

said first luminous body has an emission peak in the wavelength range of 300 nm or longer and 420 nm or shorter, and

said second luminous body comprises, as the second phosphor, at least one kind of a phosphor having an emission peak in the wavelength range of longer than 500 nm and 550 nm or shorter and at least one kind of a phosphor having an emission peak in the wavelength range of 570 nm or longer and 780 nm or shorter.

22. A display comprising, as a light source, a light emitting device according to claim 17.

23. An illuminating device comprising, as a light source, a light emitting device according to claim 17.

10. A production method of a phosphor containing an alkaline-earth metal aluminate, the phosphor having a crystal phase having a rate of substituted Eu (europium) to the number of sites which can be substituted with Eu of 25% or higher,

said method comprising a step of firing a phosphor precursor in the presence of univalent metal element halide of more than 0 weight % and less than 1 weight %.

11. A production method of a phosphor according to claim 10, wherein

said univalent metal element halide is halide of one or more kinds of metal elements selected from the group consisting of Na (sodium), K (potassium), and Li (lithium).

12. A production method of a phosphor according to claim 11, wherein

the obtained phosphor has β

-alumina structure.

13. A production method of a phosphor according to claim 10 wherein

the obtained phosphor further contains Mn (manganese).

14. A production method of a phosphor according to claim 10 wherein

the obtained phosphor further contains Mg (magnesium).

15. A production method of a phosphor according to claim 10 wherein

the obtained phosphor is represented by the formula [1] below.

(1−

a)Ba<sub>(1−

b−

c−

d)</sub>Sr_bCa_cEu_dMg<sub>(1−

e−

f)</sub>Zn_eMn_fAl_gO_n.(a)Ba<sub>(0.75−

b′

−

c′

−

d′

)</sub>Sr_b′

Ca_c′

Eu_d′

Al₁₁O_17.25.A_i 

 

[1]

(Where

A represents at least one kind of alkali metal, and

a, b, c, d, e, f, g, h, i, b′

, c′

, and d′

represent numbers satisfying the following conditions;

0≦

a≦

1,

0≦

b<

1,

0≦

c<

1,

0.1<

d<

1,

0≦

e<

1,

0≦

f≦

1,

9≦

g≦

11,

15.3≦

h≦

18.7,

0<

i≦

0.03,

0≦

b′

<

1,

0≦

c′

<

1, and

0.1<

d′

<

1.)