Phosphor, light emitting apparatus and method of forming phosphor
AssigneeNational Taiwan University
InventorsChung-Hsin LU, Che-Yuan YANG
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Abstract
A phosphor having a formula of TxEySizNrTbaLbMc is provided, in which T is Mg, Ca, Sr or Ba; E is Mg, Ca, Ba, Ti, Cu, Zn, B, Al, In, Sn, Sb, Bi, Ga, Y, La or Lu; L is Li, Na or K; M is Ce, Pr, Nd, Pm, Sm, Gd, Dy, Ho, Er, Tm, Yb or Mn; and 1.4≦x≦2.6, 0≦y≦0.5, 4.3≦z≦5.6, 7.4≦r≦9, 0.01≦a≦0.5, 0≦b≦0.5, 0≦c≦0.5, in which Tb ion is used as a luminescence center, and valence of the Tb ion is lower than 3+, and the phosphor is excited by an excitation light and has an emission band with a full width at half maximum greater than 50 nm. A method of forming the phosphor is also provided.
Claims16
A phosphor having Formula (I):
- TxEySizNrTbaLbMc (I),
- wherein,
- T is Mg, Ca, Sr or Ba;
- E is Mg, Ca, Ba, Ti, Cu, Zn, B, Al, In, Sn, Sb, Bi, Ga, Y, La or Lu;
- L is Li, Na or K;
- M is Ce, Pr, Nd, Pm, Sm, Gd, Dy, Ho, Er, Tm, Yb or Mn;
- and
- 1.4≦x≦2.6, 0≦y≦0.5, 4.3≦z≦5.6, 7.4≦r≦9, 0.01≦a≦0.5, 0≦b≦0.5, 0≦c≦0.5,
- wherein Tb ion is used as a luminescence center, and valence of the Tb ion is lower than 3+, and the phosphor is excited by an excitation light and has an emission band with a full width at half maximum greater than 50 nm.
A method of forming a phosphor, the method comprising:
- mixing a Tb-containing compound, a Si-containing compound and a IIA metal-containing compound to form a mixture, and each of the Tb-containing compound, the Si-containing compound and the IIA metal-containing compound is nitride or oxide, and at least one of the Tb-containing compound, the Si-containing compound and the IIA metal-containing compound is nitride;
- and
- calcining the mixture in an atmosphere to form the phosphor comprising Tb ion, Si ion, IIA-metal ion and N ion, wherein the atmosphere comprises a carbon-containing compound and a gas selected from the group consisting of hydrogen, ammonia and a combination thereof, and the Tb ion of the phosphor has a valence lower than 3+.
Dependencies are inferred from the claim text.