Oxynitride fluorescent material and light-emitting device
AssigneeNational Institute for Materials Science
InventorNaoto Hirosaki
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Abstract
The invention has for its object the provision of an oxynitride fluorescent material has higher emission luminance than conventional rare earth element-activated sialon fluorescent materials. To this end, an oxynitride fluorescent material is designed in such a way as comprising a JEM phase as a mother crystal and a luminescence center element M1. For instance, the luminescence center element M1 is at least one kind of an element selected from Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu. And the JEM phase is expressed as a general formula MA1(Si6-zAlz) N10-zOz (where M indicates a metal element, 0.1≦z≦3).
Claims26
An oxynitride fluorescent material, comprising a JEM phase as a mother crystal and a luminescence center element M1,
- wherein the luminescence center element M1 is Eu, or Eu and at least one element selected from Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu,
- wherein the JEM phase includes at least La, and
- wherein a fluorescence spectrum has a maximum emission wavelength of 510 nm to 550 nm inclusive and an excitation spectrum has a maximum excitation wavelength of 300 nm to 480 nm inclusive.
An oxynitride fluorescent material, comprising a JEM phase as a mother crystal and a luminescence center element M1,
- wherein the luminescence center element M1 is Tb, or Tb and at least one element selected from Ce, Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb and Lu,
- wherein the JEM phase includes at least La, and
- wherein a fluorescence spectrum has a maximum emission wavelength of 480 nm to 560 nm inclusive and an excitation spectrum has a maximum excitation wavelength of 200 nm to 300 nm inclusive.
An image display comprising an excitation source and a fluorescent material, wherein the fluorescent material at least includes an oxynitride fluorescent material comprising a JEM phase as a mother crystal and a luminescence center element M1.
An oxynitride fluorescent material, comprising a JEM phase as a mother crystal and a luminescence center element M1,
- wherein the luminescence center element M1 is Eu, or Eu and at least one element selected from Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu,
- wherein the JEM phase is expressed as a general formula MA1(Si6-zAlz) N10-zOz where M indicates a metal element, and 0.1≦z≦3,
- wherein the metal element M is La, or La and at least one element selected from Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, and
- wherein a fluorescence spectrum has a maximum emission wavelength of 510 nm to 550 nm inclusive and an excitation spectrum has a maximum excitation wavelength of 300 nm to 480 nm inclusive.
An oxynitride fluorescent material, comprising a JEM phase as a mother crystal and a luminescence center element M1,
- wherein the luminescence center element M1 is Tb, or Tb and at least one element selected from Ce, Pr, Nd, Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb and Lu,
- wherein the JEM phase is expressed as a general formula MA1(Si6-zAlz) N10-zOz where M indicates a metal element, and 0.1≦z≦3,
- wherein the metal element M is La, or La and at least one element selected from Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu, and
- wherein a fluorescence spectrum has a maximum emission wavelength of 480 nm to 560 nm inclusive and an excitation spectrum has a maximum excitation wavelength of 200 nm to 300 nm inclusive.
Dependencies are inferred from the claim text.