Patent US1486006A successfully refreshed from Google Patents.
Patent US5518808A successfully refreshed from Google Patents.
US5518808A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Luminescent materials prepared by coating luminescent compositions onto substrate particles
Assignee: Clarkson University
•
Filing: 1993-11-05
•
Granted: 1996-05-21
•
Expires: 2013-11-05
Abstract
Abstract The present invention relates to a novel cost efficient luminescent composition comprising particles of a core material which have been coated with a luminescent material that is distributed in the form of a chemically homogeneous layer. The average diameter of the core particle is in the range of from about 0.5 to 20 microns, and the coating corresponds to between about 2 and 30 wt % of the total composition. The composition can be employed to form a luminescent film or layer within a plasma display panel.
Inventors
- 👤 Salvatore A. Bruno
- 👤 Donald K. Swanson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 08:03
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/02; C09K11/025; C09K11/08; C09K11/77; C09K11/7766; C09K11/7774; C09K11/7783; C09K11/7784; C09K11/7787; C09K11/7794; H; H01; H01J; H01J11/00; H01J11/10; H01J11/14; H01J11/20; H01J11/34; H01J11/42; Y; Y10; Y10S; Y10S428/00; Y10S428/917; Y10T; Y10T428/00; Y10T428/25; Y10T428/258; Y10T428/259; Y10T428/26; Y10T428/266; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2996; Y10T428/2998
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
86 words
In a flat plasma display panel wherein the improvement comprises a fluorescent film comprising a luminescent powder composition comprising particles with an inert core and at least one luminescent coating on said inert core, the coating comprising about 2 through about 30 weight percent of the powder composition, wherein the core comprises at least one member from the group consisting of barium sulphate, calcium sulphate, magnesium oxide, and calcium fluoride, and the average diameter of the core particles ranges from about 0.5 to about 10 microns.
Claim 2
Dependent Claim
86 words
In a flat plasma display panel wherein the improvement comprises a fluorescent film comprising a luminescent powder composition comprising particles with an inert core and at least one luminescent coating on said inert core, the coating comprising about 2 through about 30 weight percent of the powder composition, wherein the core comprises at least one member from the group consisting of barium sulphate, calcium sulphate, magnesium oxide, and calcium fluoride, and the average diameter of the core particles ranges from about 0.5 to about 10 microns.
Claim 3
Dependent Claim
54 words
The powder composition of claim 1 wherein the inert core comprises barium sulfate and the luminescent coating comprises at least one member from the group consisting of Zn 2 SiO 4 :Mn, (Y 2 O 3 :Eu), BaMg 2 Al 16 O 27 , MgAl 11 O 19 (Ce,Tb) and (Y,Gd) BO 3 :Eu.
Claim 4
Dependent Claim
54 words
The powder composition of claim 1 wherein the inert core comprises barium sulfate and the luminescent coating comprises at least two members from the group consisting of Zn 2 SiO 4 :Mn, (Y 2 O 3 :Eu), BaMg 2 Al 16 O 27 , MgAl 11 O 19 (Ce,Tb) and (Y,Gd) BO 3 :Eu.
Claim 5
Dependent Claim
87 words
The plasma display panel of claim 1 wherein the luminescent coating comprises at least one member selected from the group consisting of (Y 2 O 3 :Eu), (Y 2 O 2 S:Eu), (YVO 4 :Eu), (Zn 2 SiO 4 :Mn), (BaMg 2 Al 16 O 27 :Eu), (SrB 4 O 7 :Eu), (CeO.sub..65 TbO.sub..35):MgAl 11 O 19 , (ZnS:Cu), (ZnS:Ag), (MgWO 4 ), barium titanium phosphate, Sn and Eu activated alkaline earth ortho and pyrophosphates, Sb and/or Mn activated calcium halophosphates, and (La,Ce,Tb)(PO 4 ) 3 :(Ce,Tb).
Claim 6
Dependent Claim
31 words
The plasma display panel of claim 1 wherein the inert core comprises at least one member selected from the group consisting of barium sulfate, magnesium oxide, calcium fluoride, and calcium sulfate.
Claim 7
Dependent Claim
34 words
The plasma display panel of claim 1 wherein the coating comprises 5 to 20 wt % of the powder composition and the average diameter of the inert core ranges from 1.0 to 10 microns.
Claim 8
Dependent Claim
27 words
The plasma display panel of claim 1 wherein the surface of the inert core includes a barrier coating between the inert core and the luminescent powder coating.
Claim 9
Dependent Claim
38 words
The plasma display panel of claim 1 wherein about 90 wt % of the inert core have a diameter which ranges from at least about 0.1 D to 10.0 D, wherein D is the weight average particle diameter.
Claim 10
Dependent Claim
14 words
The plasma display panel of claim 1 wherein the inert core comprises barium sulfate.
Claim 11
Dependent Claim
17 words
The plasma display panel of claim 9 wherein the luminescent coating comprises (Y 2 O 3 :Eu).
Claim 12
Dependent Claim
101 words
A paste composition comprising a luminescent powder composition comprising particles with an inert core and at least two successive luminescent coatings on said inert core, the coatings comprising about 2 through about 30 weight percent of the luminescent powder composition, wherein the average diameter of the core particles ranges from about 0.5 to about 10 microns; and an amount of an organic vehicle that is effective to disperse said luminescent powder composition wherein the inert core comprises at least one member selected from the group consisting of an alkaline earth sulfate, alkaline earth phosphate, mixed metal oxides, and alkaline earth fluoride.
Claim 13
Dependent Claim
101 words
A paste composition comprising a luminescent powder composition comprising particles with an inert core and at least two successive luminescent coatings on said inert core, the coatings comprising about 2 through about 30 weight percent of the luminescent powder composition, wherein the average diameter of the core particles ranges from about 0.5 to about 10 microns; and an amount of an organic vehicle that is effective to disperse said luminescent powder composition wherein the inert core comprises at least one member selected from the group consisting of an alkaline earth sulfate, alkaline earth phosphate, mixed metal oxides, and alkaline earth fluoride.
Claim 14
Dependent Claim
89 words
The paste composition of claim 11 wherein the luminescent coatings comprise at least one member selected from the group consisting of (Y 2 O 3 :Eu), (Y 2 O 2 S:Eu), (YVO 4 :Eu), (Zn 2 SiO 4 :Mn), (BaMg 2 Al 16 O 27 :Eu), (SrB 4 O 7 :Eu), (CeO. 65 TbO. 35 ):MgAl 11 O 19 , (ZnS:Cu), (ZnS:Ag), (MgWO 4 ), barium titanium phosphate, Sn and Eu activated alkaline earth ortho and pyrophosphates, Sb and/or Mn activated calcium halophosphates, and (La,Ce,Th)(PO 4 ) 3 :(Ce,Tb).
Claim 15
Dependent Claim
30 words
The paste composition of claim 11 wherein the inert core comprises at least one member selected from the group consisting of barium sulfate, magnesium oxide, calcium fluoride, and calcium sulfate.
Claim 16
Dependent Claim
33 words
The paste composition of claim 11 wherein the coatings comprise 5 to 20 weight percent of the luminescent composition and the average diameter of the core particles ranges from 1.0 to 10 microns.
Claim 17
Dependent Claim
25 words
The paste composition of claim 11 wherein the surface of the inert core includes a barrier coating between the inert core and the luminescent coatings.
Claim 18
Dependent Claim
37 words
The paste composition of claim 11 wherein about 90% by weight of the inert core have a diameter which ranges from at least about 0.1 D to 10.0 D, wherein D is the weight average particle diameter.
Claim 19
Dependent Claim
13 words
The paste composition of claim 11 wherein the inert core comprises barium sulfate.
Claim 20
Dependent Claim
16 words
The paste composition of claim 17 wherein the luminescent coatings comprise (Y 2 O 3 :Eu).
Claim 21
Dependent Claim
11 words
A plasma display panel containing the paste composition of claim 11.
References Cited (Backward Citations)
US4037172A
Cited
US3275466A
Cited
GB1168074A
Cited
US3522071A
Cited
DE2052700A1
Cited
US3676177A
Cited
US3625659A
Cited
DE2200039A1
Cited
JPS4843931A
Cited
JPS4934204A
Cited
JPS4967890A
Cited
JPS4967891A
Cited
US3984587A
Cited
JPS50139681A
Cited
DE2620821A1
Cited
JPS5229478A
Cited
DE2904018A1
Cited
JPS54107483A
Cited
US4396528A
Cited
DE2850081A1
Cited
JPS5638631A
Cited
DE3012055A1
Cited
GB2082618A
Cited
JPS57143354A
Cited
JPS61181889A
Cited
JPS61258892A
Cited
US4624861A
Cited
JPS6422987A
Cited
EP0338934A1
Cited
US5082811A
Cited
US5145743A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-05-21 | 1999-11-20 | 2000-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-05-21 | 2003-11-20 | 2004-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-05-21 | 2007-11-20 | 2008-05-21 | $7700.00 | Window Closed / Lapsed |