Light-transmitting sintered body, light-emitting tube and electric discharge lamp using same

• US 20020032118A1
• Filed: 05/08/2001
• Published: 03/14/2002
• Est. Priority Date: 05/09/2000
• Status: Active Grant

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Oshio, Shozo
• Granted Patent: US 6,740,262 B2
• Time in Patent Office: Days
• US Class Current: 501/120
• CPC Class Codes: C04B 35/115 Translucent or transparent products
• CPC Class Codes: C04B 35/117 Composites
• CPC Class Codes: C09K 11/7734 Aluminates
• CPC Class Codes: C09K 11/77346 Aluminium Nitrides or Aluminium Oxynitrides
• CPC Class Codes: C09K 11/7774 Aluminates
• CPC Class Codes: C09K 11/77746 Aluminium Nitrides or Aluminium Oxynitrides
• CPC Class Codes: C09K 11/7786 with alkaline earth metals
• CPC Class Codes: H01J 61/302 characterised by the material of the vessel
• CPC Class Codes: H01J 61/44 Devices characterised by the luminescent material

Abstract

A light-transmitting (fluorescent) sintered body formed of specific substances different from the prior art materials, solving problems that the performance or efficiency, uses and manufacturing methods are limited which have not been solved with the prior art light-transmitting sintered body and which provides a light-emitting tube and an electric discharge lamp using a light-transmitting (fluorescent) sintered body formed of the specific substance.

Provided are a light-transmitting sintered body mainly formed of a compound having a Mugnetplumbite structure or a β-alumina structure except for aluminum oxide, a light-transmitting sintered body mainly formed of a compound containing rare earth elements with an ionic valence of two, aluminum element and oxygen element as main components and an light-transmitting sintered body formed of mainly of a compound containing elements with an ionic valence of two except for rare earth elements, rare earth elements and oxygen element as main components.

Claims

1. A light-transmitting sintered body comprising a compound as main component, said compound having a Mugnetplumbite structure.

5. The light-transmitting sintered body as defined in claim 1 or 2 which is an aluminum compound.

6. The light-transmitting sintered body as defined in claims 1 to 4 which contains alkaline rare earth elements as main components.

7. The light-transmitting sintered body as defined in claims 1 to 4 which is an oxide.

8. The light-transmitting sintered body as defined in claim 1 which comprises an compound of the composition formula α

₍₁₎δ

₍₁₎ Al_xO_y as main component where α

₍₁₎ represents at least one element selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu;

δ

₍₁₎ represents at least one element selected from the group consisting of Mg, Zn, Mn;

x has a value satisfying 5.5≦

x≦

22, and y has a value satisfying 9.5≦

y≦

38.

12. The light-transmitting sintered body as defined in claims 1, 2, 3, 4, or 10 which is a light-transmitting fluorescent sintered body fluorescing under irradiation with ultraviolet rays with a wave-length of not shorter than 100 nm and not longer than 380 nm.

2. A light-transmitting sintered body comprising a compound as main component except for aluminum oxide, said compound having a β

-alumina structure.

9. The light-transmitting sintered body as defined in claim 2 or claim 3 which comprises an compound of the composition formula γ

₍₂₎δ

₍₂₎Al_xO_y as main component where γ

₍₂₎, with an ionic valence of two expressed in (II), represents at least one element selected from the group consisting of Ca, Sr, Ba, Eu(II), Sm(II), Yb(II), Dy(II) and δ

₍₂₎ represents at least one element selected from the group consisting of Mg, Zn, Mn and where x has a value satisfying 5.5≦

x≦

20, and y has a value satisfying 8.5≦

y≦

34.

3. A light-transmitting sintered body comprising a compound as main component, said compound containing rare earth elements with an ionic valence of two, aluminum element and oxygen element as main components.

4. A light-transmitting sintered body comprising a compound as main component, said compound containing elements with an ionic valence of two except for rare earth elements, rare earth elements and oxygen element as main components.

11. The light-transmitting sintered body as defined in claim 4 which comprises an compound of the composition formula γ

₍₄₎α

_(1)xO_y where α

₍₁₎ represents at least one element selected from the group consisting of Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and γ

₍₄₎ represents at least one element selected from the group consisting of Mg, Ca, Sr, Ba, Zn and where x has a value satisfying 1≦

x≦

4, and y has a value satisfying 2≦

y≦

8.

10. The light-transmitting sintered body which comprises an compound of the composition formula γ

₍₂₎Al_xO_y as main component where γ

₍₂₎, with an ionic valence of two expressed in (II), represents at least one element selected from the group consisting of Ca, Sr, Ba, Eu(II), Sm(II), Yb(II), Dy(II) and where x has a value satisfying 1≦

x≦

24, and y has a value satisfying 2≦

y≦

38.

13. A light-emitting tube which comprises, at least in part, a light-transmitting sintered body formed mainly of a compound having a Mugnetplumbite structure.

14. A light-emitting tube which comprises, at least in part, a light-transmitting sintered body formed mainly of a compound having a β

-alumina structure except for aluminum oxide.

15. A light-emitting tube which comprises, at least in part, a light-transmitting sintered body formed mainly of a compound containing rare earth elements with an ionic valence of two, aluminum element and oxygen element as main components.

16. A light-emitting tube which comprises, at least in part, a light-transmitting sintered body formed mainly of a compound of the composition formula γ

₍₂₎Al_xO_y where γ

₍₂₎, with an ionic valence of two expressed in (II), represents at least one element selected from the group consisting of Ca, Sr, Ba, Eu(II), Sm(II), Yb(II), Dy(II) and where x has a value satisfying 1≦

x≦

24, and y has a value satisfying 2≦

y≦

38.

17. A light-emitting tube which comprises, at least in part, a transmitting sintered body formed mainly of a compound containing elements with an ionic valence of two except for rare earth elements, rare earth elements and oxygen element as main components.

18. An electric discharge lamp which comprises, at least in part, a transmitting sintered body formed mainly of a compound having a Mugnetplumbite structure.

19. An electric discharge lamp which comprises, at least in part, a transmitting sintered body formed mainly of a compound having β

-alumina structure except for aluminum oxide.

20. An electric discharge lamp which comprises, at least in part, a transmitting sintered body formed mainly of a compound containing rare earth elements with an ionic valence of two, aluminum element and oxygen element as main components.

21. An electric discharge lamp which comprises, at least in part, a transmitting sintered body formed mainly of a compound of the composition formula γ

₍₂₎Al_xO_y where said γ

₍₂₎, with an ionic valence of two expressed in (II), represents at least one element selected from the group consisting of Ca, Sr, Ba, Eu(II), Sm(II), Yb(II), Dy(II) and where x has a value satisfying 1≦

x≦

24, and y has a value satisfying 2≦

y≦

38.

22. An electric discharge lamp which comprise, at least in part, a transmitting sintered body formed mainly of a compound containing elements with an ionic valence of two except for rare earth elements, rare earth elements and oxygen element as main components.