US4107571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light emitting device having luminescent screen with self activated blue light emitting phosphor
Assignee: Hitachi Ltd
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Filing: 1974-10-22
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Granted: 1978-08-15
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Expires: 1994-10-22
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 0 <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 0<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
2026-11-08 13:34
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7783; C09K11/7795; C09K11/7794
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
134 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 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, wherein said phosphor is a self-activated blue light emitting phosphor where a = 0 and 0<b<1.0.
Claim 2
Dependent Claim
134 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 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, wherein said phosphor is a self-activated blue light emitting phosphor where a = 0 and 0<b<1.0.
Claim 3
Dependent Claim
16 words
The light emitting device according to claim 1, wherein said excitation energy is at 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
24 words
The light emitting device according to claim 1, wherein said phosphor has a composition of YP 0 .85 V 0 .15 O 4 .
Claim 9
Dependent Claim
24 words
The light emitting device according to claim 1, wherein said phosphor has a composition of YP 0 .9 V 0 .1 O 4 .
Claim 10
Dependent Claim
23 words
The light emitting device according to claim 1, wherein said phosphor has a compositin of ScP b V 1-b O 4 , (0<b<1).
Claim 11
Dependent Claim
23 words
The light emitting device according to claim 1, wherein said phosphor has a composition of LuP b V 1-b O 4 , (0<b<1).
Claim 12
Dependent Claim
24 words
The light emitting device according to claim 10, wherein said phosphor has a composition of LuP 0 .85 V 0 .15 O 4 .
Claim 13
Dependent Claim
23 words
The light emitting device according to claim 1, wherein said phosphor has a composition of GdP b V 1-b O 4 , (0<b<1).
Claim 14
Dependent Claim
24 words
The light emitting device according to claim 12, wherein said phosphor has a composition of GdP 0 .6 V 0 .4 O 4 .
Claim 15
Dependent Claim
33 words
The light emitting device according to claim 1, wherein said phosphor has a composition of Y 0 .98 M' 0 .02 P 0 .85 V 0 .15 O 4 , where M'= Al,Ga,In.
Claim 16
Dependent Claim
30 words
The light emitting device according to claim 14, wherein said phosphor has a composition of Y 0 .98 Ga 0 .02 P 0 .85 V 0 .15 O 4 .
Claim 17
Dependent Claim
164 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 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, wherein said phosphor is a self-activated blue light emitting phosphor at a = 0, and wherein said phosphor has a composition of Y 0 .98 M" 0 .02 P 0 .85 V 0 .15 O 4 , where M" ═ Sc,Gd,Lu.
Claim 18
Dependent Claim
164 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 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, wherein said phosphor is a self-activated blue light emitting phosphor at a = 0, and wherein said phosphor has a composition of Y 0 .98 M" 0 .02 P 0 .85 V 0 .15 O 4 , where M" ═ Sc,Gd,Lu.
Claim 19
Dependent Claim
30 words
The light emitting device according to claim 16, wherein said phosphor has a composition of Y 0 .98 Gd 0 .02 P 0 .85 V 0 .15 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) | 1981-08-14 | 1982-02-13 | 1982-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-08-14 | 1986-02-13 | 1986-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-08-14 | 1990-02-13 | 1990-08-15 | $7700.00 | Window Closed / Lapsed |