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US4171501A
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Light emitting devices based on the excitation of phosphor screens
Assignee: Hitachi Ltd
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Filing: 1977-11-07
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Granted: 1979-10-16
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Expires: 1997-11-07
Abstract
Abstract A light emitting device wherein a blue screen or a red screen is excited by 5 to 25eV photons or electrons, the blue screen containing a self-activated phosphor which is represented by the general formula MPbV1-bO4 where M stands for at least one member selected from the group consisting of yttrium (Y), scandium (Sc), rare-earth elements having atomic numbers of 57-62 and 64-71, and group-IIIb elements of the periodic table, and where O<b<1.0, the red screen containing a trivalent europium (Eu3+) activated phosphor which is represented by the general formula M1-aEuaPbV1-bO4 where M stands for at least one member selected from the group consisting of yttrium (Y), scandium (Sc), rare-earth elements having atomic numbers of 57-62 and 64-71, and group-IIIb elements of the periodic table, and where O<a<1.0 and 0<b</=1.0.
Inventors
- 👤 Shinkichi Tanimizu
- 👤 Teruki Suzuki
- 👤 Tadashi Fukuzawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:18
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7783; C09K11/7794; C09K11/7795
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
120 words
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≦1.0.
Claim 2
Dependent Claim
120 words
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≦1.0.
Claim 3
Dependent Claim
15 words
The light emitting device according to claim 1, wherein said excitation energy is 147 nm.
Claim 4
Dependent Claim
16 words
The light emitting device according to claim 1, wherein said excitation energy is at 200 nm.
Claim 5
Dependent Claim
17 words
The light emitting device according to claim 1, wherein said exciting source is provided from xenon gas.
Claim 6
Dependent Claim
17 words
The light emitting device according to claim 1, wherein said exciting source is provided from helium gas.
Claim 7
Dependent Claim
15 words
The light emitting device according to claim 1, wherein said exciting source excludes mercury vapor.
Claim 8
Dependent Claim
29 words
The light emitting device according to claim 1, wherein said phosphor has a composition of Y 1-a Eu a P 0 .65 V 0 .35 O 4 , (0<a<1).
Claim 9
Dependent Claim
29 words
The light emitting device according to claim 1, wherein said phosphor has a composition of Y 0 .96 Eu 0 .04 P b V 1-b O 4 , (0<b<1).
Claim 10
Dependent Claim
30 words
The light emitting device according to claim 1, wherein said phosphor has a composition of Y 0 .96 Eu 0 .04 P 0 .65 V 0 .35 O 4 .
Claim 11
Dependent Claim
30 words
The light emitting device according to claim 1, wherein said phosphor has a composition of Y 0 .88 Eu 0 .12 P 0 .65 V 0 .35 O 4 .
Claim 12
Dependent Claim
26 words
The light emitting device according to claim 1, wherein said phosphor has a composition of Sc 1-a Eu a P b V 1-b O 4 .
Claim 13
Dependent Claim
29 words
The light emitting device according to claim 1, wherein said phosphor has a composition of Gd 1-a Eu a P b V 1-b O 4 , (0<a<1) and (0<b≦1).
Claim 14
Dependent Claim
30 words
The light emitting device according to claim 12, wherein said phosphor has a composition of Gd 0 .96 Eu 0 .04 P 0 .65 V 0 .35 O 4 .
Claim 15
Dependent Claim
30 words
The light emitting device according to claim 12, wherein said phosphor has a composition of Gd 0 .88 Eu 0 .12 P 0 .65 V 0 .35 O 4 .
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-10-15 | 1983-04-16 | 1983-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-15 | 1987-04-16 | 1987-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-15 | 1991-04-16 | 1991-10-16 | $7700.00 | Window Closed / Lapsed |