EP0479300A1
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EP
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Phosphor-coating composition, and discharge lamp
Assignee: Nichia Corp
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Filing: 1991-10-02
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Granted: —
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Expires: 2011-10-02
Abstract
Abstract A phosphor-coating composition contains phosphor particles, particles of a rare earth compound, a binder, and a dispersing medium. The rare earth compound is present in an amount of 0.001 to 5% by weight in terms of the corresponding oxide.
Inventors
- 👤 Toshiaki C/O Nichia Kagaku Kogyo K.K. Tateiwa
- 👤 Kouichi C/O Nichia Kagaku Kogyo K.K. Okada
- 👤 Tetsuya C/O Nichia Kagaku Kogyo K.K. Sadamoto
- 👤 Yoshihito C/O Nichia Kagaku Kogyo K.K. Hario
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-03 17:58
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/02; C09K11/025; H; H01; H01J; H01J61/00; H01J61/02; H01J61/38; H01J61/42; H01J61/46
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
61 words
A phosphor-coating composition comprising: phosphor particles; particles of at least one rare earth compound in an amount of 0.001 to 5% by weight in terms of a corresponding rare earth oxide, based on the weight of the phosphor particles; at least one binder; and a medium dissolving the binder, and dispersing the phosphor particles and the rare earth compound particles therein.
Claim 2
Dependent Claim
61 words
A phosphor-coating composition comprising: phosphor particles; particles of at least one rare earth compound in an amount of 0.001 to 5% by weight in terms of a corresponding rare earth oxide, based on the weight of the phosphor particles; at least one binder; and a medium dissolving the binder, and dispersing the phosphor particles and the rare earth compound particles therein.
Claim 3
Dependent Claim
28 words
The composition according to claim 1, characterized in that said rare earth oxide is represented by R 2 0 3 , where R denotes a rare earth element.
Claim 4
Dependent Claim
32 words
The composition according to claim 1, characterized in that said rare earth compound is present in an amount of 0.2 to 1.5% by weight in terms of the corresponding rare earth oxide.
Claim 5
Dependent Claim
33 words
The composition according to claim 1, characterized in that said rare earth compound is selected from the group consisting of oxides, hydroxides, nitrates, sulfates, borates, halides, and acetates of the rare earth elements.
Claim 6
Dependent Claim
31 words
The composition according to claim 4, characterized in that said rare earth element is selected from the group consisting of scandium, yttrium, lanthanum, samarium, europium, gadolinium, dysprosium, holmium, thulium and lutetium.
Claim 7
Dependent Claim
47 words
The composition according to claim 5, characterized in that said rare earth compound is at least one member selected from the group consisting of yttrium oxide, lanthanum oxide, yttrium hydroxide, lanthanum hydroxide, yttrium nitrate, lanthanum nitrate, yttrium chloride, lanthanum chloride, dysprosium chloride, yttrium acetate, and lanthanum acetate.
Claim 8
Dependent Claim
21 words
The composition according to claim 1, characterized in that said phosphor particles have an average diameter of 3 to 8 tim.
Claim 9
Dependent Claim
25 words
The composition according to claim 1, characterized in that said particles of the rare earth compound have an average diameter of 0.1 to 1 tim.
Claim 10
Dependent Claim
15 words
The composition according to claim 1, characterized in that said medium is an organic medium.
Claim 11
Dependent Claim
13 words
The composition according to claim 1, characterized in that said medium is water.
Claim 12
Dependent Claim
24 words
A discharge lamp manufactured by applying the phosphor-coating composition of claim 1 to an inner surface of a bulb, and baking the applied composition.
References Cited (Backward Citations)
US4131821A
Cited
GB2082618A
Cited
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