LIGHT EMITTING DEVICE WITH BA2MGSI2O7:EU2+, BA2SIO4:EU2+, OR (SRXCAY BA1-X-Y)(A1ZGA1-Z)2SR:EU2+PHOSPHORS
First Claim
1. A lamp comprising:
- a light emitting element which emits blue light; and
a phosphor composition disposed in relation to the light emitting element such that the phosphor composition receives and absorbs the blue light having a first spectrum from the light emitting element and emits light having a second spectrum, the phosphor composition comprising at least one of Ba2MgSi2O7;
Eu2+;
Ba2SiO4;
Eu2+; and
(Sr,Ca,Ba)(Al,Ga)2S4;
Eu2+.
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Accused Products
Abstract
A lamp comprises a light emitting element such as a light emitting diode or a laser diode which emits blue light, and a phosphor composition which absorbs the blue light having a first spectrum from the light emitting element and emits light having a second spectrum. The phosphor composition comprises at least one of Ba2MgSi2O7:Eu2+; Ba2SiO4:Eu2+; and (Sr,Ca,Ba)(Al,Ga)2S4:Eu2+. The invention also relates to a light emitting element which emits blue light, and a phosphor composition which absorbs the blue light from the light emitting element having a first spectrum and emits light having a second spectrum, wherein the spectral luminous efficacy of light emitted by the lamp is at least 550 lumens per watt. The high spectral luminous efficacy of the output spectrum efficiently converts the power input to the lamp into lumens to provide a high brightness. For example the device luminous efficacy of the lamp can be 35-45 lumens output per watt of input electric power or more.
273 Citations
26 Claims
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1. A lamp comprising:
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a light emitting element which emits blue light; and
a phosphor composition disposed in relation to the light emitting element such that the phosphor composition receives and absorbs the blue light having a first spectrum from the light emitting element and emits light having a second spectrum, the phosphor composition comprising at least one of Ba2MgSi2O7;
Eu2+;
Ba2SiO4;
Eu2+; and
(Sr,Ca,Ba)(Al,Ga)2S4;
Eu2+.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A lamp comprising:
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a light emitting element which emits blue light; and
a phosphor composition which absorbs the blue light from the light emitting element having a first spectrum and emits light having a second spectrum, wherein the spectral luminous efficacy of light emitted by the lamp is at least 550 lumens per watt of radiant power. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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18. A lamp comprising:
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a light emitting element which emits blue light; and
a phosphor composition which absorbs the blue light from the light emitting element having a first spectrum and emits light having a second spectrum, wherein the spectral luminous efficacy of light emitted by the lamp is at least 550 lumens per watt of radiant power and wherein the phosphor composition comprises at least one of;
Ba2MgSi2O7;
Eu2+;
Ba2SiO4;
Eu2+; and
(Sr,Ca,Ba)(Al,Ga)2S4;
Eu2+.
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19. A lamp comprising:
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a light emitting element which emits blue light; and
a phosphor composition which absorbs the blue light from the light emitting element having a first spectrum and emits light having a second spectrum, wherein the device luminous efficacy of the lamp is at least 35 lumens per watt of input electric power. - View Dependent Claims (20)
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21. A method of producing light comprising the steps of:
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generating blue light with a light emitting device;
directing the blue light to a phosphor composition which absorbs the blue light, the phosphor composition comprising at least one of;
Ba2MgSi2O7;
Eu ;
Ba2SiO4;
Eu2+; and
(Sr,Ca,Ba)(Al,Ga)2S4;
Eu2+; and
converting the blue light with the phosphor composition to light having a different spectrum. - View Dependent Claims (22, 23)
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24. A method of producing light comprising the steps of:
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generating blue light with a light emitting device; and
absorbing the blue light with a phosphor composition which emits light of a different spectrum such that the light emitted by the light emitting device and phosphor composition together has a spectral luminous efficacy of at least 550 lumens per watt of radiant power.
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25. A lamp comprising:
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a light emitting element which emits blue light, and a phosphor composition which absorbs the blue light having a first spectrum from the light emitting element and emits light having a second spectrum, the phosphor composition comprising Ba2MgSi2O7;
Eu2+.
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26. A lamp comprising:
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a light emitting element which emits blue light; and
a phosphor composition which absorbs the blue light having a first spectrum from the light emitting element and emits light having a second spectrum, the phosphor composition comprising Ba2SiO4;
Eu2+.
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Specification