Phosphor, production method thereof and light emitting instrument
A light emitting element includes a light-emitting source for emitting light at a wavelength of 330 to 500 nm and a constituent phosphor. The constituent phosphor includes a compound including M, A, Al, O, and N, where M is at least one kind of element selected from Mn, Ce, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, and Yb, and A is at least one kind of element selected from C, Si, Ge, Sn, B, Ga, In, Mg, Ca, Sr, Ba, Sc, Y, La, Gd, Lu, Ti, Zr, Hf, Ta, and W.
1. A lighting instrument, comprising:
a light-emitting source for emitting light at a wavelength of 330 to 500 nm; and
a constituent phosphor,
wherein the constituent phosphor includes a compound including
a metallic element M, where M is at least one kind of element selected from the group consisting of Mn, Ce, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, and Yb;
Al;
O;
N; and
an element A, where A is Si and/or B, and
wherein the compound is an AlN-based crystal having a wurtzite AlN crystal structure or a crystal structure selected from the group consisting of 2Hδ, 27R, 21R, 12H, 15R, and 8H.
2. The lighting instrument of claim 1 , wherein
the light-emitting source is an LED or an LD for emitting light at a wavelength between 330 and 420 nm,
the constituent phosphor further includes a green-aimed phosphor having an emission peak at a wavelength between 520 nm and 550 nm by pump light between 330 and 420 nm and a red-aimed phosphor having an emission peak at a wavelength between 600 nm and 700 nm by pump light between 330 and 420 nm in a manner that the constituent phosphor emits white light mixedly including blue light by the compound, green light by the green-aimed phosphor, and red light by the red-aimed phosphor.
3. The lighting instrument of claim 1 , wherein
the light-emitting source is an LED or an LD for emitting light at a wavelength between 330 and 420 nm and
the constituent phosphor further includes a green-aimed phosphor having an emission peak at a wavelength between 520 nm and 550 nm by pump light between 330 and 420 nm, a yellow-aimed phosphor having an emission peak at a wavelength between 550 nm and 600 nm by pump light between 330 and 420 nm, and a red-aimed phosphor having an emission peak at a wavelength between 600 nm and 700 nm by pump light between 330 and 420 nm in a manner that the constituent phosphor emits white light mixedly including blue light by the compound, green light by the green-aimed phosphor, yellow light by the yellow-aimed phosphor, and red light by the red-aimed phosphor.
4. The lighting instrument of claim 2 , wherein the green-aimed phosphor is β-sialon activated with Eu.
5. The lighting instrument of claim 2 , wherein the red-aimed phosphor is CaAlSiN 3 activated with Eu or a CaAlSiN 3 solid-solution crystal activated with Eu.
6. The lighting instrument of claim 3 , wherein the yellow-aimed phosphor is Ca-α-sialon activated with Eu.
7. The lighting instrument of claim 1 , wherein the compound exhibits a 2θ value in measurement by X-ray diffraction adopting a Cu—Kα line such that the 20 value has diffraction peaks derived from the AlN-based crystal at least in ranges between 32 degrees inclusive and 35 degrees inclusive and between 58 degrees inclusive and 62 degrees inclusive, respectively.
8. The lighting instrument of claim 7 , wherein
the diffraction peak between 32 degrees inclusive and 35 degrees inclusive is derived from a (100) face of the AlN-based crystal and
the diffraction peak between 58 degrees inclusive and 62 degrees inclusive is derived from a (110) face of the AlN-based crystal.
9. The lighting instrument of claim 1 , wherein the compound is represented by a composition formula M a Al b A c N d O e , where a+b+c+d+e=1, satisfying the following conditions:
0.00001≦a≦0.1 (i),
0.4≦b≦0.55 (ii),
0.001≦c≦0.1 (iii),
0.4≦d≦0.55 (iv), and
0.001≦e≦0.1 (v).
10. The lighting instrument of claim 1 , wherein
the compound includes at least Si as the element A, and at least Eu as the metallic element M where Eu is divalent and
the compound has an emission peak wavelength within a range between 450 nm inclusive and 520 nm inclusive.
11. The lighting instrument of claim 1 , wherein
the compound includes at least Mn as the metallic element M and
the compound has an emission peak wavelength within a range between 560 nm inclusive and 650 nm inclusive.
12. The lighting instrument of claim 1 , wherein
the constituent phosphor further includes a crystal phase or an amorphous phase different from the AlN-based crystal and
the AlN-based crystal is included at a content of 10 mass % or more.
13. The lighting instrument of claim 12 , wherein the crystal phase or the amorphous phase different from the AlN-based crystal is an inorganic substance having electroconductivity.
14. The lighting instrument of claim 13 , wherein the inorganic substance having electroconductivity is oxide, oxynitride, nitride, or a mixture thereof including one kind or two or more kinds of element selected from the group consisting of Zn, Ga, In, and Sn.
15. The lighting instrument of claim 1 , wherein the AlN-based crystal is a solid-solution crystal including Si and/or B therein.
16. The lighting instrument of claim 1 , wherein the light-emitting source for emitting light at a wavelength of 330 to 500 nm is an excitation source.