Phosphors for LED lamps
AssigneeGeneral Electric Company
InventorsJames Edward Murphy, Satya Kishore Manepalli, Prasanth Nammalwar Kumar
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Abstract
A phosphor, a phosphor blend including the phosphor, a phosphor prepared by a process, and a lighting apparatus including the phosphor blend are disclosed. The phosphor has the formula (Ca1-p-qCepKq)xScy(Si1-rGar)zO12+δ or derived from a process followed using disclosed amounts of reactants. In the formula, (0<p≦0.06); 0≦q≦0.06; 0≦r≦0.2; and −0.1≦δ≦0.4. In one embodiment, 3<x≦3.1; 2≦y≦2.15; and 3≦z≦3.2. Similarly, in another embodiment, 3≦x≦3.1; 2<y≦2.15; and 2.8≦z≦3.2.
Claims24
A phosphor of formula (Ca1-p-qCepKq)xScy(Si1-rGar)zO12+δ, wherein
- 0<p≦0.06;
- 0≦q≦0.06;
- 0≦r≦0.2;
- −0.1≦δ≦0.4;
- and
- (i) 3<x≦3.1;
- 2≦y≦2.15;
- and 3≦z≦3.2, or
- (ii) 3≦x≦3.1;
- 2<y≦2.15;
- and 2.8≦z≦3.2.
A phosphor blend comprising:
- a phosphor of formula (Ca1-p-qCepKq)xScy(Si1-rGar), O12+δ, wherein
- 0<p≦0.06;
- 0≦q≦0.06;
- 0≦r≦0.2;
- −0.1≦δ≦0.4;
- and
- (i) 3<x≦3.1;
- 2≦y≦2.15;
- and 3≦z≦3.2, or
- (ii) 3≦x≦3.1;
- 2<y≦2.15;
- and 2.8≦z≦3.2.
A lighting apparatus capable of emitting white light, said lighting apparatus comprising:
- a semiconductor light source;
- and
- a phosphor blend radiationally coupled to the light source, the phosphor blend comprising:
- a phosphor of formula (Ca1-p-qCepKq)xScy(Si1-rGar)zO12+δ, wherein
- 0<p≦0.06;
- 0≦q≦0.06;
- 0≦r≦0.2;
- −0.1≦δ≦0.4;
- and
- (i) 3<x≦3.1;
- 2≦y≦2.15;
- and 3≦z≦3.2, or
- (ii) 3≦x≦3.1;
- 2<y≦2.15;
- and 2.8≦z≦3.2.
A phosphor derived from combining
- from about 2.91 moles to about 2.95 of calcium;
- from about 0.001 moles to about 0.2 moles of cerium,
- from about 1.8 moles to about 2.2 moles of scandium,
- from about 2.8 moles to about 3.2 moles of silicon to form a blend.
Dependencies are inferred from the claim text.