Phosphor and including the same, light emitting apparatus, illuminating apparatus and image display
AssigneeMitsubishi Chemical Corporation
InventorsTakatoshi Seto, Naoto Kijima, Masahiko Yoshino, Masayoshi Mikami, Motoyuki Shigeiwa, Hiroyuki Imura
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Abstract
An object of the present invention is to provide a high-efficiency red light emitting phosphor and white light emitting phosphor for using in a display or lighting which high-efficiently emits light in combination with a light source which emits light in the region from near-ultraviolet light to visible light. The present invention relates to a phosphor having a crystal phase having a specified chemical composition.
Claims26
A phosphor comprising a crystal phase having any one chemical composition of the following formulas [1] to [3]:
- Eua0Mnb0M10c0M20d0M30Oe0Z0f0 [1]
- wherein M10 is a divalent element containing 85 mol % or more of at least one element selected from the group consisting of Ba, Ca and Sr, in which the ratio (molar ratio) of Ca to the sum of Ba and Ca is from 0.1 to 0.9;
- M20 represents at least one element selected from the group consisting of a monovalent, trivalent and pentavalent elements;
- M30 represents a group of tetravalent elements containing Si and Ge in a total amount of 90 mol % or more;
- Z0 is at least one element selected from the group consisting of a minus monovalent and minus divalent elements, H and N;
- and a0 is a number satisfying 0.001a0≦0.6, b0 is a number satisfying 0≦b0≦0.7, c0 and d0 are numbers satisfying 0≦d0/(c0+d0)0.2, a0, b0 c0 and d0 are numbers satisfying 1.8≦(a0+b0+c0+d0)≦2.2, and e0 and f0 are numbers satisfying 0≦f0/(e0+f0)≦0.035 and 3.6≦(e0+f0)≦4.4:
- Eua1Mnb1MgclM11d1M21Oe1Z1f1 [2 ]
- wherein M11 represents at least one element selected from the group consisting of a monovalent element, a divalent element except Eu, Mn and Mg, a trivalent element and a pentavalent element, in which the proportion of the divalent element is 80 mol % or more, the proportion of the sum of Ba, Ca and Sr is 40mol % or more, and the ratio (molar ratio) of Ca to the sum of Ba and Ca is from 0.2 to 0.9;
- M21 represents a group of tetravalent elements containing Si and Ge in a total amount of 90 mol % or more;
- Z1 is at least one element selected from the group consisting of a minus monovalent and minus divalent elements, H and N;
- and a1 is a number satisfying 0.001≦a1≦0.8, b1 is a number satisfying 0<b1≦0.8, c1 and d1 are numbers satisfying 0<c1/(c1+d1)≦0.2, a1 b1 c1 and d1 are numbers satisfying 1.8≦(a1+b1+c1+d1)≦2.2, and c1 and f1 are numbers satisfying 0≦f1/(e1+f1)≦0.035 and 3.6≦(e1+f1)≦4.4:
- Eua2Mnb2Mgc2M12d2M22Oe2Z2f2 [3]
- wherein M12 represents at least one element selected from the group consisting of a monovalent element, a divalent element except Eu, Mn and Mg, a trivalent element and a pentavalent element, in which the proportion of the divalent element is 80 mol % or more, the proportion of the sum of Ba, Ca and Sr is 40mol % or more, and the ratio (molar ratio) of Ca to the sum of Ba and Ca is less than 0.2;
- M22 represents a group of tetravalent elements containing Si and Ge in a total amount of 90 mol % or more;
- Z2 is at least one element selected from the group consisting of a minus monovalent and minus divalent elements, H and N;
- and a2 is a number satisfying 0.0003≦a2≦0.8, b2 is a number satisfying 0<b2≦0.8, c2 and d2 are numbers satisfying 0<c2/(c2+d2)≦0.2 or 0.3≦c2/(c2+d2)≦0.8, a2, b2 c2 and d2 are numbers satisfying 1.8≦(a2+b2+c2+d2)≦2.2, and e2 and f2 are numbers satisfying 0≦f2/(e2+f2)≦0.035 and 3.6≦(e2+f2)≦4.4, wherein the phosphor emits red or white light.
The phosphor according to 1, wherein 0.03≦b1≦0.8 and the phosphor emits red light.
A phosphor comprising a crystal phase of an alkali earth silicate containing at least one element selected from the group consisting of Ba, Sr, Ca and Mg, wherein said crystal phase is a crystal phase satisfying the following conditions:
- In X-ray diffraction measurement using a CuKα as an X-ray source, a diffraction peak is observed within the range (R0) of the diffraction angle (2θ) from 21.30° to 22.50°, and when this diffraction peak is taken as a reference diffraction peak (P0) and 5 diffraction angle ranges derived from the Bragg angle (θs) of P0 are taken as R1, R2, R3, R4 and R5, wherein
- R1:
- 2×arc sin{ sin(θ0)/(0.720×1.010)}to 2×arc sin{ sin(θ0)/(0.720×0.990)},
- R2:
- 2×arc sin{ sin(θ0)/(0.698×1.010)} to 2×arc sin { sin(θ0)/(0.698×0.990)},
- R3:
- 2×arc sin { sin(θ0)/(0.592×1.010)} to 2×arc sin { sin(θ0)/(0.592×0.990)},
- R4:
- 2×arc sin{ sin(θ0)/(0.572×1.010)} to 2×arcsin {sin(θ0)/(0.572×0.990)}, and
- R5:
- 2×arcsin {sin(θ0)/(0.500×1.010)}to 2×arc sin { sin(θ0)/(0.500×0.990)},
- at least one diffraction peak exists in these 5 ranges, with the proviso that P0 has an intensity of 20% or more by the diffraction peak height ratio, based on the strongest diffraction peak of said 6 or more crystal phase-derived diffraction peaks, and the other peaks has an intensity of 9% or more by the diffraction peak height ratio, wherein when two or more diffraction peaks exist in one angle range, a peak higher in intensity is selected, wherein the phosphor emits red or white light.
Dependencies are inferred from the claim text.