Phosphor, method for producing same and light emitting element
AssigneeNational Institute for Materials Science
InventorNaoto Hirosaki
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Abstract
Provided is a phosphor which emits near-infrared light upon irradiation of visible light or ultraviolet light. A phosphor in an embodiment of the present invention includes an inorganic substance which contains at least an Eu element, an M[3] element (M[3] is at least one selected from the group consisting of Al, Y, La and Gd.), a Si element and nitrogen element, and also contains, if necessary, at least one element selected from the group consisting of M[1] element (M[1] is Li element.), an M[2] element (M[2] is at least one element selected from the group consisting of Mg, Ca, Ba and Sr.) and an oxygen element, while the phosphor has a maximum value of an emission peak at a wavelength in the range of 760 nm or more and 850 nm and less upon irradiation by an excitation source.
Claims19
A phosphor comprising an inorganic substance comprising an Eu element, an M[3] element (M[3] is at least one kind of element selected from a group consisting of Al, Y, La, and Gd), a Si element, a nitrogen element, and, if necessary, at least one kind of element selected from a group consisting of an M[1] element (M[1] is a Li element), an M[2] element (M[2] is at least one kind of element selected from a group consisting of Mg, Ca, Ba, and Sr), and an oxygen element,
- wherein the inorganic substance is represented by a composition of M[1]aEubM[2]cM[3]dSieOfNg (where a+b+c+d+e+f+g=1) wherein parameters a, b, c, d, e, f, and g are represented by values respectively satisfying:
- 0≤a≤0.01,
- 0.006≤b≤0.15,
- 0≤c≤0.15,
- 0.001≤d≤0.07,
- 0.3≤e≤0.35,
- 0≤f≤0.05, and
- 0.5≤g≤0.56;
- the phosphor emitting light having a local maximum value of a emission peak at a wavelength in a range of 760 nm or more and 850 nm or less upon irradiation by an excitation source.
Dependencies are inferred from the claim text.