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US5055227A
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Fluorescent composition for low velocity electron beam excitation
Assignee: Mitsubishi Chemical Corp
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Filing: 1990-05-15
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Granted: 1991-10-08
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Expires: 2010-05-15
Abstract
Abstract A fluorescent composition for low velocity electron beam excitation, comprising a phosphor capable of emitting light under excitation by a high velocity electron beam and indium oxide (In2O3) mixed or mutually adhered to each other, wherein the half value width of the strongest diffraction line in the diffraction X-ray spectrum of the indium oxide (In2O3) is within a range of from 0.10 DEG to 0.25 DEG .
Inventors
- 👤 Kunihiko Yoneshima
- 👤 Fumio Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:23
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/64; C09K11/641; C09K11/642; C09K11/02; C09K11/025; C09K11/54; C09K11/56; C09K11/562; C09K11/565; C09K11/58; C09K11/582; C09K11/584; C09K11/61; C09K11/611; C09K11/612; H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/20
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
177 words
A fluorescent composition for low velocity electron beam excitation at an acceleration voltage of not higher than about 1 kV, comprising a phosphor capable of emitting light under excitation by a high velocity electron beam above 1 kV acceleration voltage and inidium oxide (In 2 O 3 ) mixed or mutually adhered to each other, wherein the half value width of the strongest diffraction line in the diffraction X-ray spectrum of said indium oxide (In 2 O 3 ) is within a range of from 0.10° to 0.25°, and wherein the weight ratio of In 2 O 3 to the phosphor is 1/99 to 7/13 for the case of a mixture of the phsophor and In 2 O 3 and is 1/199 to 3/7 for the case that the In 2 O 3 is adhered to the phosphor, said fluorescent composition exhibiting a higher luminance than the fluorescent composition, as defined above but where the half value width of the strongest diffraction line in the diffraction X-ray spectrum of the indium oxide is outside of said range.
Claim 2
Dependent Claim
177 words
A fluorescent composition for low velocity electron beam excitation at an acceleration voltage of not higher than about 1 kV, comprising a phosphor capable of emitting light under excitation by a high velocity electron beam above 1 kV acceleration voltage and inidium oxide (In 2 O 3 ) mixed or mutually adhered to each other, wherein the half value width of the strongest diffraction line in the diffraction X-ray spectrum of said indium oxide (In 2 O 3 ) is within a range of from 0.10° to 0.25°, and wherein the weight ratio of In 2 O 3 to the phosphor is 1/99 to 7/13 for the case of a mixture of the phsophor and In 2 O 3 and is 1/199 to 3/7 for the case that the In 2 O 3 is adhered to the phosphor, said fluorescent composition exhibiting a higher luminance than the fluorescent composition, as defined above but where the half value width of the strongest diffraction line in the diffraction X-ray spectrum of the indium oxide is outside of said range.
Claim 3
Dependent Claim
28 words
The fluorescent composition for low velocity electron beam excitation according to claim 1, wherein the half value width is within a range of from 0.13° to 0.20 °.
Claim 4
Dependent Claim
42 words
The fluorescent composition for low velocity electron beam excitation according to claim 2, wherein the phosphor is a sulfide phosphor whose hot material is the formula (Zn 1-x , Cd x )S wherein x is a number satisfying a condition of 0≦x≦1.
Claim 5
Dependent Claim
23 words
The fluorescent composition for low velocity electron beam excitation according to claim 2, wherein the phosphor is a zinc-activated zinc oxide phosphor (ZnO:Zn).
Claim 6
Dependent Claim
45 words
The fluorescent composition for low velocity electron beam excitation according to claim 1, wherein the phosphor is a sulfide phosphor whose host material is a sulfide of the formula (Zn 1-x , Cd x )S wherein x is a number satisfying a condition of 0≦x≦1.
Claim 7
Dependent Claim
23 words
The fluorescent composition for low velocity electron beam excitation according to claim 1, wherein the phosphor is a zinc-activated zinc oxide phosphor (ZnO:Zn).
References Cited (Backward Citations)
US4208612A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1994-10-07 | 1995-04-08 | 1995-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-07 | 1999-04-08 | 1999-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-07 | 2003-04-08 | 2003-10-08 | $7700.00 | Window Closed / Lapsed |