Claims
- 1. A light emitting device, comprising:
- a light-permeable envelope,
- an exciting source providing excitation energy ranging from 5 to 25 eV, said exciting source being a gas selected from the group consisting of xenon, krypton, argon, neon, helium, or a mixture thereof, and
- a luminescent screen which is provided inside said envelope at which it can convert said excitation energy from said exciting source into red visible light, said luminescent screen containing a phosphor represented by the general formula:
- M.sub.1-a Eu.sub.a P.sub.b V.sub.1-b O.sub.4
- where M stands for at least one member selected from the group consisting of yttrium, scandium, rare-earth elements having atomic numbers of 57-62 and 64-71, and group-IIIb elements of the periodic table, and where 0<a<1.0 and 0<b.ltoreq.1.0.
- 2. The light emitting device according to claim 1, wherein said excitation energy is 147 nm.
- 3. The light emitting device according to claim 1, wherein said excitation energy is at 200 nm.
- 4. The light emitting device according to claim 1, wherein said exciting source is provided from xenon gas.
- 5. The light emitting device according to claim 1, wherein said exciting source is provided from helium gas.
- 6. The light emitting device according to claim 1, wherein said exciting source excludes mercury vapor.
- 7. The light emitting device according to claim 1, wherein said phosphor has a composition of Y.sub.1-a Eu.sub.a P.sub.0.65 V.sub.0.35 O.sub.4, (0<a<1).
- 8. The light emitting device according to claim 1, wherein said phosphor has a composition of Y.sub.0.96 Eu.sub.0.04 P.sub.b V.sub.1-b O.sub.4, (0<b<1).
- 9. The light emitting device according to claim 1, wherein said phosphor has a composition of Y.sub.0.96 Eu.sub.0.04 P.sub.0.65 V.sub.0.35 O.sub.4.
- 10. The light emitting device according to claim 1, wherein said phosphor has a composition of Y.sub.0.88 Eu.sub.0.12 P.sub.0.65 V.sub.0.35 O.sub.4.
- 11. The light emitting device according to claim 1, wherein said phosphor has a composition of Sc.sub.1-a Eu.sub.a P.sub.b V.sub.1-b O.sub.4.
- 12. The light emitting device according to claim 1, wherein said phosphor has a composition of Gd.sub.1-a Eu.sub.a P.sub.b V.sub.1-b O.sub.4, (0<a<1) and (0<b.ltoreq.1).
- 13. The light emitting device according to claim 12, wherein said phosphor has a composition of Gd.sub.0.96 Eu.sub.0.04 P.sub.0.65 V.sub.0.35 O.sub.4.
- 14. The light emitting device according to claim 12, wherein said phosphor has a composition of Gd.sub.0.88 Eu.sub.0.12 P.sub.0.65 V.sub.0.35 O.sub.4.
Priority Claims (2)
Number |
Date |
Country |
Kind |
48/117966 |
Oct 1973 |
JPX |
|
48/117967 |
Oct 1973 |
JPX |
|
Parent Case Info
This is a division of application Ser. No. 516,953, filed Oct. 22, 1974 now U.S. Pat. No. 4,107,571.
US Referenced Citations (7)
Non-Patent Literature Citations (1)
Entry |
Luminescence of Solids, by H. W. Leverenz, 1950, pp. 248, 249. |
Divisions (1)
|
Number |
Date |
Country |
Parent |
516953 |
Oct 1974 |
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