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US3793527A
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Method for analyzing rare earth-activated rare earth oxide and oxysulfide phosphors
Assignee: Zenith Electronics LLC
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Filing: 1972-11-02
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Granted: 1974-02-19
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Expires: 1992-11-02
Abstract
Abstract This disclosure depicts a method for quickly and accurately determining the emission color and activator content of rare earth-activated rare earth oxide and oxysulfide phosphors such as Y2O2S:Eu. The method involves exciting the tested phosphor by ultra-violet irradiation or other suitable stimulation, detecting the intensities of predetermined spectral lines in the emission spectrum of the excited phosphor, and comparing the related intensities of the detected lines to derive an indication of the emission color and activator content of the phosphor.
Inventors
- 👤 H Forest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:28
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/62; G01N21/63; G01N21/64; G01N2021/6417
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
20 words
The method defined by claim 1 wherein the intensity peak heights of the predetermined emission lines are detected and compared.
Claim 2
Independent Claim
58 words
A method for determining the emission color of a rare earth-activated rare earth oxysulfide phosphor, comprising: exciting the phosphor to cause light emission; detecting the intensities of predetermined spectral lines in the emission spectrum of the excited phosphor; and comparing the relative intensities of the detected lines to derive an indication of the emission color of the phosphor.
Claim 3
Dependent Claim
37 words
The method defined by claim 3 wherein said phosphor is selected from the group of phosphors consisting of europium activated yttrium oxysulfide, gadolinium oxysulfide, lutecium oxysulfide, lanthanum oxysulfide and solid solutions of one or more of these.
Claim 4
Dependent Claim
28 words
The method defined by claim 4 wherein said predetermined spectral lines comprise at least one line each from the manifold of lines associated with 5D1 and 5D0 transitions.
Claim 5
Dependent Claim
19 words
The method defined by claim 3 wherein the intensity peak heights of the predetermined emissions are detected and compared.
Claim 6
Independent Claim
97 words
A method for determining the emission color of a phosphor selected from the group consisting of Y2O2S:Eu, La2O2S:Eu, GD2O2S:Eu and Ln2O2S:Eu and solid solutions of these, comprising: exciting the phosphor with ultra-violet irradiation to cause light emission; detecting the intensity peak height of predetermined spectral lines in the emission spectrum of the excited phosphor, said lines comprising at least one each associated with the 5D0 and 5D1 manifolds; and comparing the relative intensity peak height of the detected lines associated with the 5D0 and 5D1 manifolds to derive an indication of the emission color of the phosphor.
Claim 7
Dependent Claim
21 words
The method defined by claim 7 wherein said predetermined spectral lines are proximate in the emission spectrum of the said phosphor.
Claim 8
Independent Claim
81 words
A method for determining the emission color of europium-activated yttrium oxysulfide phosphor, comprising: exciting the phosphor with ultra-violet irradiation to cause light emission; detecting the peak intensities of predetermined spectral lines in the emission spectrum of the excited phosphor, said lines comprising at least one Each associated with the 5D0 and 5D1 manifolds; and comparing the relative intensity peak heights of the detected lines in the 5D0 and 5D1 manifolds to derive an indication of the emission color of the phosphor.
Claim 9
Dependent Claim
23 words
The method defined by claim 9 wherein said predetermined spectral lines are proximate in the emission spectrum and have corresponding intensity peak heights.
Claim 10
Dependent Claim
22 words
The method defined by claim 10 wherein said emission lines are associated with the 5D0 -> 7F0 and 5D1 -> 7F3 transitions.
Claim 11
Dependent Claim
30 words
The method defined by claim 11 wherein said predetermined emission lines comprise the 5D0 -> 7F0 line and one of the multiple lines associated with the 5D1 -> 7F3 transitions.
Claim 12
Independent Claim
62 words
A method for determining the concentration of the activator in a rare earth-activated rare earth oxide or oxysulfide phosphor, comprising: exciting the phosphor to cause light emission; detecting the intensities of predetermined spectral lines in the emission spectrum of the excited phosphor; and comparing the relative intensities of the detected lines to derive an indication of the activator concentration in the phosphor.
Claim 13
Dependent Claim
33 words
The method defined by claim 13 wherein said phosphor is selected from the group of phosphors consisting of europium-activated yttrium oxysulfide, gadolinium, lanthanum oxysulfide and solid solutions of one or more of these.
Claim 14
Dependent Claim
28 words
The method defined by claim 14 wherein said predetermined spectral lines comprise at least one line each from the family of lines associated with 5D1 and 5D0 transitions.
Claim 15
Dependent Claim
19 words
The method defined by claim 13 wherein the intensity peak heights of the predetermined lines are detected and compared.
Claim 16
Independent Claim
97 words
A method for determining the europium concentration in a phosphor selected from the group consisting of Y2O2S:Eu, La2O2S: Eu, Gd2O2S:Eu and Lu2O2S:Eu and solid solutions thereof, comprising: exciting the phosphor with ultra-violet irradiation to cause light emission; detecting the intensity peak height of predetermined spectral lines in the emission spectrum of the excited phosphor, said lines comprising at least one each associated with the 5D0 and 5D1 manifolds; and comparing the relative intensity peak height of the detected lines associated with the 5D0 and 5D1 manifolds to derive an indication of the europium concentration in the phosphor.
Claim 17
Dependent Claim
21 words
The method defined by claim 17 wherein said predetermined spectral lines are proximate in the emission spectrum of the said phosphor.
Claim 18
Dependent Claim
30 words
The method defined by claim 17 wherein said predetermined emission lines comprise the 5D0 -> 7F0 line and one of the multiple lines associated with the 5D1 -> 7F3 transitions.
Claim 19
Independent Claim
81 words
A method for determining the europium concentration of europium-activated yttrium oxysulfide phosphor, comprising: exciting the phosphor with ultra-violet irradiation to cause light emission; detecting the peak intensities of predetermined spectral lines in the emission spectrum of the excited phosphor, said lines comprising at least one each associated with the transitions 5D0 and 5D1; and comparing the relative intensity peak height of the detected lines in the 5D0 and 5D1 transitions to derive an indication of the europium concentration in the phosphor.
Claim 20
Dependent Claim
23 words
The method defined by claim 20 wherein said predetermined spectral lines are proximate in the emission spectrum and have corresponding intensity peak heights.
Claim 21
Dependent Claim
22 words
The method defined by claim 21 wherein said emission lines are associated with the 5D0 -> 7F0 and 5D1 -> 7F3 transitions.
References Cited (Backward Citations)
US3617743A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |