US6979415B1
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Luminescent nanomaterials powders having predetermined morphology and method of making
Assignee: General Electric Co
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Filing: 2004-03-31
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Granted: 2005-12-27
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Expires: 2024-03-31
Abstract
Abstract A method of making a luminescent nanomaterial having a plurality of nanoparticles. The luminescent nanomaterial includes at least one lanthanide group metal phosphate and at least one lanthanide series dopant, wherein each of the plurality of nanoparticles has a predetermined morphology. The luminescent nanomaterial has a high quantum efficiency and a high absorption value. The method yields a variety of morphologies and sizes of the plurality of nanoparticles. The particles size of the luminescent material varies from tens of nanometers to a few hundred of nanometers.
Inventors
- 👤 Kalaga Murali Krishna
- 👤 Mohan Manoharan
- 👤 Geetha Karavoor
- 👤 Shweta Saraswat
- 👤 Sergio Paulo Martins Loureiro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:41
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/77; C09K11/7766; C09K11/7777; B; B82; B82Y; B82Y20/00; B82Y30/00
Claims Analysis
Total Claims: 64
Claim 1
Independent Claim
55 words
A luminescent nanomaterial, said luminescent nanomaterial comprising a plurality of nanoparticles, comprising at least one lanthanide group metal phosphate and at least one lanthanide series dopant, wherein each of said plurality of nanoparticles has a predetermined morphology, and wherein said luminescent nanomaterial has a quantum efficiency in a range from about 80% to about 100%.
Claim 2
Dependent Claim
55 words
A luminescent nanomaterial, said luminescent nanomaterial comprising a plurality of nanoparticles, comprising at least one lanthanide group metal phosphate and at least one lanthanide series dopant, wherein each of said plurality of nanoparticles has a predetermined morphology, and wherein said luminescent nanomaterial has a quantum efficiency in a range from about 80% to about 100%.
Claim 3
Dependent Claim
25 words
The luminescent nanomaterial according to claim 1 , wherein said luminescent nanomaterial has a quantum efficiency in a range from about 80% to about 90%.
Claim 4
Dependent Claim
25 words
The luminescent nanomaterial according to claim 1 , wherein said luminescent nanomaterial has a quantum efficiency in a range from about 90% to about 100%.
Claim 5
Dependent Claim
20 words
The luminescent nanomaterial according to claim 1 , wherein said luminescent nanomaterial has a quantum efficiency of at least 100%.
Claim 6
Dependent Claim
20 words
The luminescent nanomaterial according to claim 1 , wherein said luminescent nanomaterial has an absorption value of at least 80%.
Claim 7
Dependent Claim
24 words
The luminescent nanomaterial according to claim 1 , wherein said lanthanide group metal phosphate comprises at least one of gadolinium phosphate and lanthanum phosphate.
Claim 8
Dependent Claim
27 words
The luminescent nanomaterial according to claim 1 , wherein said lanthanide group metal phosphate is one of lanthanum phosphate, gadolinium phosphate, gadolinium lanthanum phosphate, and combinations thereof.
Claim 9
Dependent Claim
26 words
The luminescent nanomaterial according to claim 1 , wherein said at least one lanthanide series dopant comprises at least one of cerium, terbium, or combinations thereof.
Claim 10
Dependent Claim
31 words
The luminescent nanomaterial according to claim 1 , wherein each of said plurality of nanoparticles has at least one dimension in a range from about 5 nm to about 500 nm.
Claim 11
Dependent Claim
31 words
The luminescent nanomaterial according to claim 9 , wherein each of said plurality of nanoparticles has at least one dimension in a range from about 10 nm to about 200 nm.
Claim 12
Dependent Claim
31 words
The luminescent nanomaterial according to claim 9 , wherein each of said plurality of nanoparticles has at least one dimension in a range from about 50 nm to about 100 nm.
Claim 13
Dependent Claim
30 words
The luminescent nanomaterial according to claim 1 , wherein said predetermined morphology comprises at least one of a spheroidal morphology, an elongated platelet morphology, a rod-like morphology, or combinations thereof.
Claim 14
Dependent Claim
142 words
A luminescent nanomaterial, said luminescent nanomaterial comprising a plurality of nanoparticles, comprising at least one lanthanide group metal phosphate and at least one lanthanide series dopant, wherein each of said plurality of nanoparticles has a predetermined morphology, wherein said predetermined morphology comprises one of a spheroidal morphology an elongated platelet morphology, a rod-like morphology, or combinations thereof, wherein said luminescent nanomaterial has a quantum efficiency in a range from about 80% to about 100%, wherein said plurality of nanoparticles is formed by: a) forming a homogenized precursor solution of at least one lanthanide group metal precursor and at least one lanthanide series dopant precursor; b) adding a phosphate source and a fuel to said precursor solution; c) removing water from said precursor solution to leave a reaction concentrate; and d) igniting said reaction concentrate to form a powder comprising said luminescent nanomaterial.
Claim 15
Dependent Claim
142 words
A luminescent nanomaterial, said luminescent nanomaterial comprising a plurality of nanoparticles, comprising at least one lanthanide group metal phosphate and at least one lanthanide series dopant, wherein each of said plurality of nanoparticles has a predetermined morphology, wherein said predetermined morphology comprises one of a spheroidal morphology an elongated platelet morphology, a rod-like morphology, or combinations thereof, wherein said luminescent nanomaterial has a quantum efficiency in a range from about 80% to about 100%, wherein said plurality of nanoparticles is formed by: a) forming a homogenized precursor solution of at least one lanthanide group metal precursor and at least one lanthanide series dopant precursor; b) adding a phosphate source and a fuel to said precursor solution; c) removing water from said precursor solution to leave a reaction concentrate; and d) igniting said reaction concentrate to form a powder comprising said luminescent nanomaterial.
Claim 16
Dependent Claim
25 words
The luminescent nanomaterial according to claim 13 , wherein said luminescent nanomaterial has a quantum efficiency in a range from about 80% to about 90%.
Claim 17
Dependent Claim
25 words
The luminescent nanomaterial according to claim 13 , wherein said luminescent nanomaterial has a quantum efficiency in a range from about 90% to about 100%.
Claim 18
Dependent Claim
20 words
The luminescent nanomaterial according to claim 13 , wherein said luminescent nanomaterial has a quantum efficiency of at least 100%.
Claim 19
Dependent Claim
20 words
The luminescent nanomaterial according to claim 13 , wherein said luminescent nanomaterial has an absorption value of at least 80%.
Claim 20
Dependent Claim
24 words
The luminescent nanomaterial according to claim 13 , wherein said lanthanide group metal phosphate comprises at least one of gadolinium phosphate and lanthanum phosphate.
Claim 21
Dependent Claim
27 words
The luminescent nanomaterial according to claim 13 , wherein said lanthanide group metal phosphate is one of lanthanum phosphate, gadolinium phosphate, gadolinium lanthanum phosphate, and combinations thereof.
Claim 22
Dependent Claim
24 words
The luminescent nanomaterial according to claim 13 , wherein said at least one lanthanide series dopant comprises one of cerium, terbium, or combinations thereof.
Claim 23
Dependent Claim
31 words
The luminescent nanomaterial according to claim 13 , wherein each of said plurality of nanoparticles has at least one dimension in a range from about 5 nm to about 500 nm.
Claim 24
Dependent Claim
30 words
The luminescent nanomaterial according to 21 , wherein each of said plurality of nanoparticles has at least one dimension in a range from about 10 nm to about 200 nm.
Claim 25
Dependent Claim
30 words
The luminescent nanomaterial according to 21 , wherein each of said plurality of nanoparticles has at least one dimension in a range from about 10 nm to about 200 nm.
Claim 26
Dependent Claim
31 words
The luminescent nanomaterial according to claim 21 , wherein each of said plurality of nanoparticles has at least one dimension in a range from about 50 nm to about 100 nm.
Claim 27
Dependent Claim
124 words
A luminescent nanomaterial, wherein said luminescent nanomaterial has a quantum efficiency in a range from about 80% to about 100%, said luminescent nanomaterial comprising a plurality of nanoparticles, comprises comprising at least one lanthanide group metal phosphate and at least one lanthanide series dopant, wherein each of said plurality of nanoparticles has a predetermined morphology, and wherein said plurality of nanoparticles is formed by: a) forming a homogenized precursor solution of at least one lanthanide group metal precursor and at least one lanthanide series dopant precursor; b) adding a phosphate source and a fuel to said precursor solution; c) removing water from said precursor solution to leave a reaction concentrate; and d) igniting said reaction concentrate to form a powder comprising said luminescent nanomaterial.
Claim 28
Dependent Claim
124 words
A luminescent nanomaterial, wherein said luminescent nanomaterial has a quantum efficiency in a range from about 80% to about 100%, said luminescent nanomaterial comprising a plurality of nanoparticles, comprises comprising at least one lanthanide group metal phosphate and at least one lanthanide series dopant, wherein each of said plurality of nanoparticles has a predetermined morphology, and wherein said plurality of nanoparticles is formed by: a) forming a homogenized precursor solution of at least one lanthanide group metal precursor and at least one lanthanide series dopant precursor; b) adding a phosphate source and a fuel to said precursor solution; c) removing water from said precursor solution to leave a reaction concentrate; and d) igniting said reaction concentrate to form a powder comprising said luminescent nanomaterial.
Claim 29
Dependent Claim
25 words
The luminescent nanomaterial according to claim 24 , wherein said luminescent nanomaterial has a quantum efficiency in a range from about 80% to about 90%.
Claim 30
Dependent Claim
25 words
The luminescent nanomaterial according to claim 24 , wherein said luminescent nanomaterial has a quantum efficiency in a range from about 90% to about 100%.
Claim 31
Dependent Claim
20 words
The luminescent nanomaterial according to claim 24 , wherein said luminescent nanomaterial has a quantum efficiency of at least 100%.
Claim 32
Dependent Claim
20 words
The luminescent nanomaterial according to claim 24 , wherein said luminescent nanomaterial has an absorption value of at least 80%.
Claim 33
Dependent Claim
24 words
The luminescent nanomaterial according to claim 24 , wherein said lanthanide group metal phosphate comprises at least one of gadolinium phosphate and lanthanum phosphate.
Claim 34
Dependent Claim
27 words
The luminescent nanomaterial according to claim 24 , wherein said lanthanide group metal phosphate is one of lanthanum phosphate, gadolinium phosphate, gadolinium lanthanum phosphate, and combinations thereof.
Claim 35
Dependent Claim
26 words
The luminescent nanomaterial according to claim 24 , wherein said at least one lanthanide series dopant comprises at least one of cerium, terbium, or combinations thereof.
Claim 36
Dependent Claim
31 words
The luminescent nanomaterial according to claim 24 , wherein each of said plurality of nanoparticles has at least one dimension in a range from about 5 nm to about 500 nm.
Claim 37
Dependent Claim
31 words
The luminescent nanomaterial according to claim 32 , wherein each of said plurality of nanoparticles has at least one dimension in a range from about 50 nm to about 100 nm.
Claim 38
Dependent Claim
31 words
The luminescent nanomaterial according to claim 32 , wherein each of said plurality of nanoparticles has at least one dimension in a range from about 50 nm to about 100 nm.
Claim 39
Independent Claim
124 words
A method of making a luminescent nanomaterial comprising a plurality of nanoparticles comprising at least one lanthanide group metal phosphate and at least one lanthanide series dopant, wherein said plurality of nanoparticles has a predetermined morphology, the method comprising the steps of: a) providing at least one lanthanide group metal precursor and at least one lanthanide series dopant precursor; b) forming a homogenized precursor solution comprising said at least one lanthanide group metal precursor and said at least one lanthanide series dopant precursor; c) adding a phosphate source and a fuel to said homogenized precursor solution; d) removing water from said homogenized precursor solution to leave a reaction concentrate; and e) igniting said reaction concentrate to form a powder comprising said plurality of nanoparticles.
Claim 40
Independent Claim
124 words
A method of making a luminescent nanomaterial comprising a plurality of nanoparticles comprising at least one lanthanide group metal phosphate and at least one lanthanide series dopant, wherein said plurality of nanoparticles has a predetermined morphology, the method comprising the steps of: a) providing at least one lanthanide group metal precursor and at least one lanthanide series dopant precursor; b) forming a homogenized precursor solution comprising said at least one lanthanide group metal precursor and said at least one lanthanide series dopant precursor; c) adding a phosphate source and a fuel to said homogenized precursor solution; d) removing water from said homogenized precursor solution to leave a reaction concentrate; and e) igniting said reaction concentrate to form a powder comprising said plurality of nanoparticles.
Claim 41
Dependent Claim
39 words
The method according to claim 35 , wherein each of said lanthanide group metal precursor and said lanthanide series dopant precursor comprises at least one of an oxide, an acetate, and a carbonate precursor of a lanthanide group metal.
Claim 42
Dependent Claim
61 words
The method according to claim 36 , wherein the step of forming a homogenized precursor solution of at least one lanthanide metal group precursor comprises: a) reacting the at least one lanthanide metal group precursor and the at least one lanthanide series dopant precursor with a nitrate source to form a lanthanide nitrate; and b) dissolving the lanthanide nitrate in water.
Claim 43
Dependent Claim
21 words
The method according to claim 37 , wherein the nitrate source comprises at least one of nitric acid and ammonium nitrate.
Claim 44
Dependent Claim
29 words
The method according to claim 35 , wherein said lanthanide group metal precursor and said lanthanide series dopant precursor each comprise a nitrate precursor of a lanthanide group metal.
Claim 45
Dependent Claim
35 words
The method according to claim 35 , wherein said homogenized precursor solution is formed by dissolving said at least one lanthanide group metal precursors and said at least one lanthanide series dopant precursor in water.
Claim 46
Dependent Claim
24 words
The method according to claim 35 , wherein said homogenized precursor solution has a pH in a range from about 0.5 to about 5.
Claim 47
Dependent Claim
20 words
The method according to claim 41 , wherein said pH is in a range from about 1 to about 3.5.
Claim 48
Dependent Claim
24 words
The method according to claim 35 , wherein said phosphate source comprises at least one of di-ammonium hydrogen phosphate, phosphoric acid, and boron phosphate.
Claim 49
Dependent Claim
14 words
The method according to claim 35 , wherein said fuel is a carbon source.
Claim 50
Dependent Claim
13 words
The method according to claim 44 , wherein said carbon source is urea.
Claim 51
Dependent Claim
13 words
The method according to claim 44 , wherein said carbon source is glycine.
Claim 52
Dependent Claim
13 words
The method according to claim 44 , wherein said carbon source is hydrazine.
Claim 53
Dependent Claim
33 words
The method according to claim 37 , wherein said fuel and said lanthanide nitrate are present in said homogenized precursor solution, in a ratio in a range from about 1:2 to about 2:1.
Claim 54
Dependent Claim
18 words
The method according to claim 35 , wherein said homogenized precursor solution is ignited by a microwave oven.
Claim 55
Dependent Claim
17 words
The method according to claim 35 , wherein said homogenized precursor solution is ignited by a furnace.
Claim 56
Dependent Claim
39 words
The method according to claim 35 , wherein said homogenized precursor solution is ignited by a hot plate, heated to a predetermined temperature, wherein said predetermined temperature is in a range from about 200° C. to about 500° C.
Claim 57
Dependent Claim
24 words
The method according to claim 51 , wherein said predetermined temperature of is in a range from about 200° C. to about 300° C.
Claim 58
Dependent Claim
15 words
The method according to claim 35 , further comprising the step of homogenizing said powder.
Claim 59
Dependent Claim
32 words
The method according to claim 35 , further comprising the step of homogenizing said powder, wherein the step of homogenizing said powder comprises at least one of grinding and milling said powder.
Claim 60
Dependent Claim
52 words
The method according to claim 35 further comprising the step of stabilizing said powder, wherein the step of stabilizing comprises heating said powder to a predetermined temperature in a controlled atmosphere for a period of time, wherein said predetermined temperature is in a range from about 600° C. to about 1200° C.
Claim 61
Dependent Claim
23 words
The method according to claim 55 , wherein said predetermined temperature is in a range from about 800° C. to about 1000° C.
Claim 62
Dependent Claim
23 words
The method according to claim 55 , wherein said controlled atmosphere comprises at least one of air, nitrogen, hydrogen, and or combinations thereof.
Claim 63
Dependent Claim
23 words
The method according to claim 55 , wherein said period of time is in a range from about 1 hour to 12 hours.
Claim 64
Dependent Claim
24 words
The heat treatment according to claim 58 , wherein said period of time is in a range from about 1 hour to 6 hours.
References Cited (Backward Citations)
EP0395775A1
Cited
US5580490A
Cited
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