Yellow light-emitting halophosphate phosphors and light sources incorporating the same
AssigneeGeneral Electric Company
InventorsAlok Mani Srivastava, Holly Ann Comanzo, Anant Achyut Setlur
Life of this patent
Estimating the term…
Abstract
Halophosphate luminescent materials co-activated with europium and manganese ions and having the general formula of (Ca,Sr,Ba,Mg)5(PO4)3:Eu2+,Mn2+ are disclosed. The inclusion of manganese shifts the peak emission to longer wavelengths and, thus, is beneficial in generating a bright yellow-to-orange light. White-light sources are produced by disposing a halophosphate luminescent material, optionally with a blue light-emitting phosphor, in the vicinity of a near UV/blue LED. Blue light-emitting phosphors that may be used in embodiments of the present inventions are Sr4Al14O25:Eu2+, Sr6P6BO20:Eu2+, BaAl8O13:Eu2+, (Sr,Mg,Ca,Ba)5(PO4)3Cl:Eu2+, and Sr2Si3O6.2SrCl2:Eu2+.
Claims34
A luminescent material being activated by both europium and manganese and having a composition represent by (Ca1-x-y-p-qSrxBayMgzEupMnq)a(PO4)3D, wherein 0≦x≦1, 0≦y≦1, 0≦z≦1, 0<p≦0.3, 0<q≦0.3, 0<x+y+z+p+q≦1, 4.5≦a≦5, and D is selected from the group consisting of F, OH, and combinations thereof;
- said luminescent material being capable of absorbing electromagnetic radiation that has wavelengths in a range from about 315 nm to about 450 nm and being capable of emitting visible light.
A luminescent material being activated by both europium and manganese and having a composition represent by (Ca1-p-qEupMnq)a(PO4)3F, wherein 0<p≦0.3, 0<q≦0.3, and 4.5≦a≦5;
- said luminescent material being capable of absorbing electromagnetic radiation that has wavelengths in a range from about 315 nm to about 450 nm and being capable of emitting visible light.
A luminescent material being activated by both europium and manganese and having a composition represent by (Ca1-p-qEupMnq)a(PO4)3Cl, wherein 0<p≦0.3, 0<q≦0.3, and 4.5≦a<5;
- said luminescent material being capable of absorbing electromagnetic radiation that has wavelengths in a range from about 315 nm to about 450 nm and being capable of emitting visible light.
A light source comprising:
- at least one LED that is capable of emitting electromagnetic radiation having wavelengths in a range from near UV to blue;
- and
- at least one luminescent material selected from the group of luminescent materials having a general formula of (Ca1-x-y-p-qSrxBayMgzEupMnq)a(PO4)3D,
- wherein 0≦x≦1, 0≦y≦1, 0≦z≦1, 0<p≦0.3, 0<q≦0.3, 0<x+y+z+p+q≦1, 4.5≦a≦5, and D is selected from the group consisting of F, Cl, OH, and combinations thereof;
- said luminescent material being capable of absorbing said electromagnetic radiation emitted by said LED and emitting light having wavelengths in the visible spectrum.
A light source comprising:
- at least one LED that is capable of emitting electromagnetic radiation having wavelengths in a range from near UV to blue;
- and
- a luminescent material having a formula of (Ca1-p-qEupMnq)a(PO4)3F,
- wherein 0<p≦0.3, 0<q≦0.3, and 4.5≦a≦5;
- said luminescent material being capable of absorbing said electromagnetic radiation emitted by said LED and emitting light having wavelengths in the visible spectrum.
A light source comprising:
- at least one LED that is capable of emitting electromagnetic radiation having wavelengths in a range from near UV to blue;
- and
- a luminescent material having a formula of (Ca1-p-qEupMnq)a(PO4)3Cl,
- wherein 0<p≦0.3, 0<q≦0.3, and 4.5≦a≦5;
- said luminescent material being capable of absorbing said electromagnetic radiation emitted by said LED and emitting light having wavelengths in the visible spectrum.
A light source comprising:
- a plurality of LEDs, each being capable of emitting electromagnetic radiation having wavelengths in a range from near UV to blue;
- and at least one luminescent material selected from the group of luminescent materials having a general formula of (Ca1-x-y-p-qSrxBayMgzEupMnq)a(PO4)3D, wherein 0≦x≦1, 0≦y≦1, 0≦z≦1, 0<p≦0.3, 0<q≦0.3, 0<x+y+z+p+q≦1, 4.5≦a≦5, and D is selected from the group consisting of F, Cl, OH, and combinations thereof;
- said luminescent material being capable of absorbing said electromagnetic radiation emitted by said LED and emitting light having wavelengths in the visible spectrum.
A light source comprising:
- a plurality of LEDs, each being capable of emitting electromagnetic radiation having wavelengths in a range from near UV to blue;
- and
- a luminescent material having a formula of (Ca1-p-qEupMnq)a(PO4)3F,
- wherein 0<p≦0.3, 0<q≦0.3, and 4.5≦a≦5;
- said luminescent material being capable of absorbing said electromagnetic radiation emitted by said LED and emitting light having wavelengths in the visible spectrum.
A light source comprising:
- a plurality of LEDs, each being capable of emitting electromagnetic radiation having wavelengths in a range from near UV to blue;
- and
- a luminescent material having a formula of (Ca1-p-qEupMnq)5(PO4)3Cl,
- wherein 0<p≦0.3, 0<q≦0.3, and 4.5≦a≦5;
- said luminescent material being capable of absorbing said electromagnetic radiation emitted by said LED and emitting light having wavelengths in the visible spectrum.
A luminescent material being activated by both europium and manganese and having a composition represent by (Ca1-x-y-p-qSrxBayMgzEupMnq)a(PO4)3D, wherein 0≦x≦1, 0≦y≦1, 0<z≦1, 0<p≦0.3, 0<q≦0.3, 0<x+y+z+p+q≦1, 4.5≦a≦5, and D is selected from the group consisting of F, Cl, OH, and combinations thereof;
- said luminescent material being capable of absorbing electromagnetic radiation that has wavelengths in a range from about 315 nm to about 450 nm and being capable of emitting visible light.
Dependencies are inferred from the claim text.