Oxide phosphor and light-emitting device

Abstract

An oxide phosphor has a composition represented by the following formula (1): (Li 1-s M 1 s )(Mg 1-t M 2 t ) u (Ga 1-v M 3 v ) w O x :Gr y ,M 4 z (1) where in formula (1) M 1 at least one element selected from the group consisting of Na, K, Rb and Cs; M 2 at least one element selected from the group consisting of Ca, Sr, Ba and Zn is; M 3 at least one element, selected from the group consisting of Al and Sc, is; M 4 at least one element selected from the group consisting of Ni, Ce, Eu, Fe, Mn, Nd, Tm, Ho, Er and Yb, is; s, t, u, v, w and x 0 ≤ s ≤ 0.5, 0 ≤ t ≤ 1.0, 0.03 ≤ u ≤ 10, 0 ≤ v ≤ 1.0, 5.1 ≤ w ≤ 25, 0.005 ≤ u / w ≤ 0.4 and 8.2 ≤ x ≤ 48 satisfy; and if Li is taken as 1 or a sum of Li and M 1taken as 1, y and z 0.02 ≤ y ≤ 0.5, 0 ≤ z ≤ 0.3 and y > z, relative to Li or to the sum of Li and M 1 , fulfill.

Description

CROSS-REFERENCE TO RELATED REGISTRATION

[0001] This application claims priority over Japanese patent application No. 2024-148286, filed on August 30, 2024, the disclosure of which is hereby included in its entirety by reference. BACKGROUND Technical area

[0002] The present disclosure relates to an oxide phosphor and a light-emitting device. General state of the art

[0003] Light-emitting devices with emission intensities in a wavelength range from red to near-infrared are required for use, for example, in light sources for plant growth and cultivation. These devices are also required for use in infrared cameras, infrared communication technology, vein authentication (a type of biometric authentication), and instruments for the non-destructive measurement of sugar content in food products such as fruits and vegetables. There is also a need for light-emitting devices that emit light in the visible light wavelength range as well as in the red to near-infrared wavelength range.

[0004] An example of such a light-emitting device is a light-emitting device in which a light-emitting diode (LED) and a phosphor are combined.

[0005] Japanese patent publication No. 2020-528486 discloses a phosphor that can also be used in the light-emitting device described above, wherein the phosphor has a light emission peak wavelength in a wavelength range of 680 nm to 760 nm and a composition represented by CaYAlO4:Mn 4+ , exhibits. As a phosphor suitable for every application as described above, there may, for example, be a case where a phosphor is required that emits red to near-infrared light with a higher emission intensity. SUMMARY

[0006] One object of the present disclosure is to provide an oxide phosphor which, when irradiated with excitation light, emits light with a light emission peak wavelength in a wavelength range from red to near infrared, and a light-emitting device which includes the oxide phosphor.

[0007] A first consideration is an oxide phosphor with a composition represented by the following formula (1): (Li 1-s M 1 s )(Mg 1-t M 2 t ) u (Ga 1-v M 3 v ) w O x :Cr y ,M 4 z (1) where in formula (1) M 1 at least one element, selected from the group consisting of Na, K, Rb and Cs, is; M 2 at least one element, selected from the group consisting of Ca, Sr, Ba and Zn, is; M 3at least one element, selected from the group consisting of Al and Sc, is; M 4 at least one element selected from the group consisting of Ni, Ce, Eu, Fe, Mn, Nd, Tm, Ho, Er and Yb; s, t, u, v, w and x 0 ≤ s ≤ 0.5, 0 ≤ t ≤ 1.0, 0.03 ≤ u ≤ 10, 0 ≤ v ≤ 1.0, 5.1 ≤ w ≤ 25, 0.005 ≤ u / w ≤ 0.4 and 8.2 ≤ x ≤ 48; and if Li is taken as 1 or a sum of Li and M 1 taken as 1, y and z 0.02 ≤ y ≤ 0.5, 0 ≤ z ≤ 0.3 and y > z, relative to Li or to the sum of Li and M 1 , fulfill.

[0008] A second aspect is a light-emitting device that includes the oxide phosphor and a light-emitting element configured to emit light having a light emission peak wavelength in a range of 365 nm to 650 nm, and irradiates the oxide phosphor with the light.

[0009] According to one aspect of the present disclosure, an oxide phosphor which, when irradiated with excitation light, emits light with a light emission peak wavelength in a wavelength range from red to near-infrared of 700 nm to 1500 nm, and a light-emitting device which includes the oxide phosphor can be provided. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a schematic cross-sectional view illustrating an example of a first configurative example of a light-emitting device. Fig. Figure 2 is a schematic cross-sectional view illustrating another example of the first configurative example for the light-emitting device. Fig. Figure 3 is a schematic top view illustrating a second configurational example of a light-emitting device. Fig.Figure 4 is a schematic cross-sectional view illustrating the second configuration example for the light-emitting device. Fig. Figure 5 is a diagram illustrating emission spectra of oxide phosphors according to Examples 1 and 2 and emission spectra of oxide phosphors according to Comparative Examples 1 and 2. Fig. Figure 6 is a diagram illustrating emission spectra of oxide phosphors according to Examples 3 and 4. Fig. Figure 7 is a diagram illustrating emission spectra of oxide phosphors according to Examples 5 and 6. Fig. Figure 8 is a diagram illustrating emission spectra of oxide phosphors according to Examples 7 and 8. Fig. Figure 9 is a diagram illustrating an emission spectrum of an oxide phosphor according to Example 9. Fig.Figure 10 is a diagram illustrating emission spectra of oxide phosphors according to Examples 10 and 11. Fig. Figure 11 is a diagram illustrating emission spectra of oxide phosphors according to Examples 12 and 13. Fig. Figure 12 is a diagram illustrating emission spectra of oxide phosphors according to Examples 14 and 15. Fig. Figure 13 is a diagram illustrating emission spectra of oxide phosphors according to Examples 16 to 18. Fig. Figure 14 is a diagram illustrating emission spectra of oxide phosphors according to Examples 19 and 20. Fig. Figure 15 is a diagram illustrating emission spectra of oxide phosphors according to Examples 21 to 23 and emission spectra of oxide phosphors according to Comparative Examples 1 and 3. Fig.Figure 16 is a diagram illustrating emission spectra of oxide phosphors according to Examples 24 to 26. Fig. Figure 17 is a diagram illustrating emission spectra of oxide phosphors according to Examples 27 to 29. Fig. Figure 18 is a diagram illustrating emission spectra of oxide phosphors according to Examples 30 to 32. Fig. Figure 19 is a diagram illustrating an emission spectrum of an oxide phosphor according to Example 33. Fig. Figure 20 is a diagram illustrating emission spectra of oxide phosphors according to Examples 34 and 35. Fig. Figure 21 is a diagram illustrating emission spectra of oxide phosphors according to Examples 36 and 37. DETAILED DESCRIPTION

[0010] An oxide phosphor and a light-emitting device according to the present disclosure are described below. The embodiments illustrated below are examples of the implementation of a technical idea of ​​the present disclosure, and the present disclosure is not limited to the following oxide phosphor, the following light-emitting device, and the following method for producing the oxide phosphor. With respect to visible light, the relationship between the color name and the chromaticity coordinates, the relationship between the wavelength range of light and the color name of monochromatic light, and the like, conform to the JIS Z 8110 standard.

[0011] A light-emitting device that incorporates a phosphor must emit light within an optimal wavelength range, depending on the object being viewed and the conditions of use. For example, in medical settings and similar applications, the easy acquisition of in vivo information may be required. A living body contains absorbers of light, such as water, hemoglobin, and melanin. For instance, hemoglobin has a high absorption rate for light in the visible light wavelength range below 650 nm, but with a light-emitting device emitting light in the visible light wavelength range, light in this range does not readily penetrate a living body, and thus in vivo information is not easily acquired.If light can be shone into a living organism within a wavelength range where absorption and scattering are reduced, information from deeper regions can be accessed more easily. Therefore, there is a need for a light-emitting device capable of emitting light within a wavelength range known as a "biological window," where light can easily pass through a living organism. The "biological window" can be defined as a wavelength range from 650 nm to approximately 950 nm, a "first biological window," a wavelength range from approximately 1000 nm to approximately 1350 nm, and a wavelength range from approximately 1500 nm to approximately 1800 nm, or a "third biological window."If light can be applied within a wavelength range where absorption and scattering of light by tissue in a living body are reduced, information from deeper regions of the living body can be obtained more easily. For example, if an increase or decrease in the concentration of oxygen in the blood of a living body can be measured in relation to an increase or decrease in the absorption of light by hemoglobin binding to oxygen, information can be obtained in vivo easily by irradiation with light from the light-emitting device. Furthermore, if information from deeper regions of a living body is obtained by irradiation with light from a phosphor and a light-emitting element instead of irradiation with X-rays or the like, information can be obtained in vivo more safely.Therefore, it may be necessary for the phosphor used in the light-emitting device to have a light emission peak wavelength in a wavelength range from red to near-infrared. In some cases, the phosphor used in the light-emitting device must be one that emits light with a light emission peak wavelength in the range of 680 nm to 1500 nm, preferably from 700 nm to 1500 nm or 700 nm to 1400 nm, when excited by excitation light from the light-emitting element, emitting light with a light emission peak wavelength in the range of 365 nm to 650 nm. Recently, there has been a need for a light-emitting device that emits light in a wavelength range from red to near-infrared, which can make deeper areas in a living body more clearly visible and offers a high level of safety.In the light-emitting device, which includes the light-emitting element and the phosphor, if the phosphor has a high emission intensity and can emit high light power, the detection performance can be further increased and in vivo information can be easily obtained.

[0012] In the agricultural and food production sectors, there is a need for non-destructive sugar content measurement devices capable of measuring the sugar content of agricultural products, fruits, and vegetables without causing damage, as well as measuring instruments that can perform non-destructive taste tests on foods such as rice (for example, a "taste meter" (registered trademark)). Near-infrared spectroscopy is sometimes used as a method for non-destructively measuring the internal quality, such as sugar content, acidity, ripeness, or internal damage, of fruits and vegetables, and the surface layer quality, such as abnormal dryness occurring on the peel surface or peel surface layer near the peel surface of fruits and vegetables.Near-infrared spectroscopy involves irradiating a fruit or vegetable with light in the near-infrared wavelength range. The light transmitted through the fruit or vegetable, as well as the light reflected from it, is received, and the quality of the fruit or vegetable is measured by a decrease in the intensity of the light (absorption). A light source, such as a tungsten or xenon lamp, is used in a near-infrared spectroscopy analyzer to examine food products in these wavelength ranges. The general rules for near-infrared spectroscopy analysis in the JIS K0134 standard define near-infrared light as light in the wavelength range of 700 nm to 2500 nm.

[0013] Amidst environmental changes such as climate change, the ability to reliably supply plants, such as vegetables, and to increase plant productivity is highly desirable. Artificially managed plant factories can reliably supply the market with safe vegetables and are envisioned as a next-generation industry. Such a plant factory requires a light-emitting device that emits light to promote plant growth. Plant responses to light can be divided into photosynthesis and photomorphogenesis. Photosynthesis is a reaction in which water is broken down using light energy, producing oxygen and fixing carbon dioxide in an organic substance; it is a reaction essential for plant growth.Photomorphogenesis is a morphological reaction in which light is used as a signal to initiate seed germination, differentiation (germinating, leaf formation, etc.), movement (stomata opening / closing, chloroplast movement), light refraction, and the like. It is known that in photomorphogenetic reactions, light in a wavelength range of 690 nm to 800 nm influences the photoreceptors of plants. Therefore, it may be necessary for a light-emitting device used in a plant factory or similar setting to have a configuration capable of emitting light in a wavelength range that influences the photoreceptors (chlorophyll a, chlorophyll b, carotenoids, phytochrome, cryptochrome, and phototropin) of plants and promotes plant growth.

[0014] The near-infrared light-emitting phosphor described above must be a phosphor with a high emission intensity so that a light-emitting device can emit light suitable for the intended application and enable more accurate detection when a light-emitting element, such as a light-emitting diode (LED) or a laser diode (LD) emitting violet to blue light, is used as an excitation light source for the light-emitting device.

[0015] In some cases, a light-emitting device that emits light in a wavelength range of 365 nm or more and less than 700 nm may be required, along with light emission in a wavelength range from red to near-infrared. For example, in some cases, light emission in a wavelength range of visible light may be necessary not only to obtain internal information from a living body, fruit, or vegetable, but also to increase the visibility of an object.

[0016] The oxide phosphor has a composition represented by the following formula (1). (Li 1-s M 1 s )(Mg 1-t M 2 t ) u (Ga 1-v M 3 v ) w Ox:Cr y ,M 4 z (1)

[0017] (In formula (1) M 1at least one element, selected from the group consisting of Na, K, Rb and Cs; is M 2 at least one element, selected from the group consisting of Ca, Sr, Ba and Zn; is M 3 at least one element, selected from the group consisting of Al and Sc; is M 4 at least one element selected from the group consisting of Ni, Ce, Eu, Fe, Mn, Nd, Tm, Ho, Er and Yb; satisfy s, t, u, v, w and x 0 ≤ s ≤ 0.5, 0 ≤ t ≤ 1.0, 0.03 ≤ u ≤ 10, 0 ≤ v ≤ 1.0, 5.1 ≤ w ≤ 25, 0.005 ≤ u / w ≤ 0.4 and 8.2 ≤ x ≤ 48; and if Li is taken as 1 or a sum of Li and M 1 If y is taken as 1, then y and z satisfy 0.02 ≤ y ≤ 0.5, 0 ≤ z ≤ 0.3 and y > z, with respect to Li or the sum of Li and M. 1 .)

[0018] The oxide phosphor includes a composition in which an oxide phosphor with a composition represented by formula (1a) below and an oxide phosphor with a composition represented by formula (1b) below are combined such that the composition represented by formula (1b) below is in a range of 0.03 mol to 10 mol when the oxide phosphor with the composition represented by formula (1a) is taken as 1 mol. (Li 1-at M a1 at ) au (Ga 1-av M a2 av )50 aw :Cr ax ,Ni ay (1a)

[0019] In formula (1a) M a1 at least one element, selected from the group consisting of Na, K, Rb and Cs; is M a2at least one element, selected from the group consisting of Al and Sc; and satisfy at, au, av, aw, ax and ay 0 ≤ at ≤ 1.0, 0.7 ≤ au ≤ 1.6, 0 ≤ av < 1.0, 7.85 ≤ aw ≤ 11.5, 0.05 ≤ ax ≤ 1.2, 0 ≤ ay ≤ 0.5, 0.25 < ax + ay ≤ 1.2 and ax > ay. (Mg 1-bt M b1 bt ) bu (Ga 1-bv-bx-by M b2 bv )2O bw :Cr bx, M b3 by (1b)

[0020] In formula (1b) M b1 at least one element, selected from the group consisting of Ca, Sr, Ba and Zn; is M b2 at least one element, selected from the group consisting of Al and Sc; is M b3 at least one element selected from the group consisting of Ce, Eu, Mn, Nd, Tm, Ho, Er and Yb; and satisfy bt, bu, bv, bw, bx and by 0 ≤ bt ≤ 1.0, 0.7 ≤ bu ≤ 1.3, 0 ≤ bv ≤ 0.8, 3.7 ≤ bw ≤ 4.3, 0.02 ≤ bx < 0.3, 0 ≤ by ≤ 0.2 and bx > by.

[0021] In this description, the term "molar fraction" refers to the proportion of each element in 1 mol of the chemical composition of the phosphor, unless otherwise specified. In this description, a plurality of elements in a composition formula separated by commas (,) indicates that at least one of these elements is present in the composition. In this description, in a composition formula representing the composition of a phosphor, the information preceding the colon (:) represents the elements that constitute a host crystal and their molar fraction, while the information following the colon (:) represents an activating element.

[0022] The oxide phosphor with the composition represented by formula (1a) and the oxide phosphor with the composition represented by formula (1b) have the same cubic crystal structure but different space groups. The oxide phosphor with the composition represented by formula (1a) has a cubic crystal structure and the space group is P4132, P4332 (space group 213 or 212 of the International Tables for Crystallography). The oxide phosphor with the composition represented by formula (1b) has a cubic crystal structure and the space group is Fd3m (space group 227 of the International Tables for Crystallography). “Fd3m” can also be written with the symbol “-” over the number 3, as described below. Fd3m

[0023] The oxide phosphor with the composition represented by formula (1) has the composition in which the oxide phosphor with the composition represented below by formula (1b) is combined in a range of 0.03 mol to 10 mol, based on 1 mol of the oxide phosphor with the composition represented by formula (1a), and emits light with a higher emission intensity when irradiated with excitation light.It is assumed that the oxide phosphor with the composition represented by formula (1), in which the oxide phosphor with the composition represented by formula (1a) and the oxide phosphor with the composition represented by formula (1b) are combined in a range of 0.03 mol to 10 mol per 1 mol of the oxide phosphor with the composition represented by formula (1a), emits light with a higher emission intensity, since the lattice lengths in the crystal structure of the oxide phosphor differ between the Mg side and the Li side in the composition of the oxide phosphor, the coordination length around Cr, which is an activating element, changes, and Cr, which is an activating element, is present in a suitable manner in the crystal structure, thus enabling the emission of light with a higher emission intensity.It is also assumed that the compound serving as the starting material for Li contained in the composition represented by formula (1a) and the compound serving as the starting material for Mg contained in the composition represented by formula (1b) have different melting points, and when the starting materials are mixed to produce the oxide phosphor represented by formula (1), the compound with a low melting point acts as a flux on the compound with a high melting point to promote the growth of the oxide phosphor particles.The oxide phosphor with the composition represented by formula (1) preferably has a composition in which the oxide phosphor with the composition represented by formula (1b) is combined in a range of 0.03 mol to 5 mol, more preferably in a range of 0.05 mol to 4.5 mol, optionally 0.1 mol or more or 0.2 mol or more, based on 1 mol of the oxide phosphor with the composition represented by formula (1a).

[0024] In formula (1), the oxide phosphor with the composition shown in formula (1) contains Cr, which is an activating element. The oxide phosphor in formula (1) has a variable y, which represents the molar fraction of Cr as an activating element, fulfilling a range of 0.02 to 0.5 (0.02 ≤ y ≤ 0.5), preferably a range of 0.03 to 0.48 (0.03 ≤ y ≤ 0.48), more preferably a range of 0.05 to 0.47 (0.05 ≤ y ≤ 0.47), and even more preferably a range of 0.1 to 0.46 (0.1 ≤ y ≤ 0.46) when Li is taken as 1 or a sum of Li and M. 1 is taken as 1, relative to Li or the sum of Li and M 1. If the variable y, which represents the molar fraction of Cr as an activating element in formula (1), satisfies a range of 0.02 to 0.5 (0.02 ≤ y ≤ 0.5), the oxide phosphor can emit light with a higher emission intensity in a wavelength range from red to near-infrared when irradiated with excitation light.

[0025] The oxide phosphor with the composition represented by formula (1) emits, when irradiated with excitation light, preferably light with a light emission peak wavelength in a range of 700 nm to 1500 nm in the emission spectrum of the oxide phosphor, more preferably light with a light emission peak wavelength in a range of 705 nm to 1400 nm, even more preferably light with a light emission peak wavelength in a range of 710 nm to 1300 nm and particularly preferably light with a light emission peak wavelength in a range of 720 nm to 1250 nm.If the oxide phosphor emits light with a light emission peak wavelength in the emission spectrum range of 700 nm to 1500 nm when irradiated with excitation light, the oxide phosphor can be used in a light-emitting device for obtaining in vivo information, a light-emitting device for the non-destructive acquisition of information about agricultural products, fruits and vegetables and the like, or a light-emitting device for promoting the growth of plants, such as vegetables.

[0026] The oxide phosphor with the composition described by formula (1) preferably emits light with an emission spectrum having a peak wavelength and a full width at half maximum (FWHM) in the range of 150 nm to 280 nm when irradiated with excitation light, more preferably emits light in the range of 180 nm to 270 nm, and even more preferably in the range of 185 nm to 260 nm. In this description, a FWHM refers to a width between wavelengths whose respective emission intensities are 50% of the emission intensity at the peak wavelength, which represents the maximum emission intensity in the emission spectrum.Since light absorption and scattering occur in living organisms, in order to measure even small changes in the propagation behavior of light in blood within a living organism, light with a broad half-width of emission spectrum and a peak emission wavelength is preferably used. Furthermore, in the case of non-destructive measurement of information in agricultural products, fruits, and vegetables, light with a broad half-width of emission spectrum and a peak emission wavelength is also preferably used to irradiate the organism, so that the internal information of the agricultural products, fruits, and vegetables can be obtained.With regard to how the color of an object appears when illuminated with light (hereinafter also referred to as a "color rendering property"), the light preferably has an emission spectrum over a broad wavelength range, and with a wider half-width, light with good color rendering properties can be emitted. For example, even in a case of use in a place where work is carried out, such as a factory, the emission of light that does not disturb the spectral balance may be necessary so that a worker can easily perform the work.

[0027] The oxide phosphor with the composition represented by formula (1) contains an element M 1In formula (1), at least one element selected from the group consisting of Na, K, Rb, and Cs can be at least one element selected from the group consisting of Na, K, and Rb, or it can contain two or more elements. In formula (1), a variable s, which represents the molar fraction of element M, satisfies 1 represents a range from 0 to 0.5 (0 ≤ s ≤ 0.5), can satisfy a range from 0 to 0.3 (0 ≤ s ≤ 0.3) or the variable s can be 0 (s = 0).

[0028] The oxide phosphor can contain an element M 2 Formula (1) must contain at least one element selected from the group consisting of Ca, Sr and Ba, excluding Zn, and may also contain two or more elements. If the element M 2 In formula (1) at least one element, selected from the group consisting of Ca, Sr and Ba, is represented in formula (1) as a variable t and a variable u, which represents the molar fraction of element M 2Representing the variable t in a range from 0 to 1.0 (0 ≤ t ≤ 1.0), can satisfy a range from 0 to 0.5 (0 ≤ t ≤ 0.5), can satisfy a range from 0 to 0.3 (0 ≤ t ≤ 0.3), or can satisfy a range from 0.01 to 0.3 (0.01 ≤ t ≤ 0.3).

[0029] In the oxide phosphor, in the composition represented by formula (1), in a case where the element M 2 at least one element, selected from the group consisting of Ca, Sr and Ba, excluding Zn, is, as the variable t and the value u, the molar part of element M 2The variable t can satisfy a range from 0 to 0.2 (0 ≤ t ≤ 0.2), a range from 0 to 0.1 (0 ≤ t ≤ 0.1), a range from 0 to 0.05 (0 < t ≤ 0.05), or the value t = 0 (t = 0). In formula (1), the variable u represents the number of moles of the oxide phosphor with the composition represented by formula (1b), based on 1 mol of the oxide phosphor with the composition represented by formula (1a). In formula (1), in a case where the variable t represents the element M 2 where 0 is (t = 0), the variable u preferably has a range from 0.03 to 5 (0.03 ≤ u ≤ 5), more preferably has a range from 0.05 to 4.5 (0.05 ≤ u ≤ 4.5), and even more preferably has a range from 0.05 to 4 (0.05 ≤ u ≤ 4). In a case where the variable t represents the element M 2If in formula (1) 0 is (t = 0) and the variable u fulfills a range from 0.03 to 5 (0.03 ≤ u ≤ 5), the oxide phosphor with the composition represented by formula (1) can emit light with a higher emission intensity in a wavelength range from red to near infrared when irradiated with excitation light.

[0030] In the oxide phosphor with the composition represented by formula (1), when the number of moles of the oxide phosphor with the composition represented by formula (1b) changes, based on 1 mol of the oxide phosphor with the composition represented by formula (1a), a variable w, which represents the molar fraction of Ga, the molar fraction of an element M, also changes. 3 or the molar fraction of a sum of Ga and the element M 3represents. In the oxide phosphor with the composition represented by formula (1), the variable w, which represents the molar fraction of Ga, satisfies the molar fraction of element M. 3 or the molar fraction of the sum of Ga and the element M 3 The variable w in formula (1) can fulfill a range of 5.1 to 25 (5.1 ≤ w ≤ 25), a range of 5.1 to 15 (5.1 ≤ w ≤ 15), a range of 5.1 to 13 (5.1 ≤ w ≤ 13), and a range of 5.4 to 13 (5.4 ≤ w ≤ 13). If the variable w in formula (1) fulfills a range of 5.1 to 25 (5.1 ≤ w ≤ 25), the oxide phosphor with the composition represented by formula (1) can, when irradiated with excitation light, emit light with a higher emission intensity in a wavelength range from red to near-infrared.

[0031] The oxide phosphor contains the element M in the composition represented by formula (1). 3at least one element, selected from the group consisting of Al and Sc, and can be two elements. In the oxide phosphor, the element M 3 In formula (1) Al. In the oxide phosphor, in one variable v and the variable w, which is the molar fraction of element M, it is satisfied. 3 in formula (1) the variable v can have a range from 0 to 1.0 (0 ≤ v ≤ 1.0) or can satisfy a range from 0 to 0.8 (0 ≤ v ≤ 0.8) or can satisfy a range from 0 to 0.5 (0 ≤ v ≤ 0.5) or can satisfy a range from 0 to 0.3 (0 ≤ v ≤ 0.3) or the variable v can be 0 (v = 0).

[0032] In the oxide phosphor, the ratio u / w in formula (1) is satisfied, in which the variable u represents the molar fraction of Mg or the molar fraction of a sum of Mg and M 2 represents and the variable w represents the molar proportion of Ga or the molar proportion of the sum of Ga and M 3The ratio u / w of the variable u to the variable w in equation (1) can satisfy a range of 0.005 to 0.4 (0.005 ≤ u / w ≤ 0.4), or can satisfy a range of 0.008 to 0.35 (0.008 ≤ u / w ≤ 0.35), or can satisfy a range of 0.009 to 0.32 (0.009 ≤ u / w ≤ 0.32). If the ratio u / w of the variable u to the variable w in equation (1) satisfies a range of 0.005 to 0.4 (0.005 ≤ u / w ≤ 0.4), the oxide phosphor can emit light with a higher emission intensity in a wavelength range from red to near-infrared when irradiated with excitation light.

[0033] In the oxide phosphor, a variable x, representing the molar fraction of oxygen (O) in formula (1), can vary depending on the number of moles of the oxide phosphor with the composition shown in formula (1b), combined with 1 mol of the oxide phosphor with the composition shown in formula (1a). In the oxide phosphor, the variable x, representing the molar fraction of oxygen (O) in formula (1), covers a range from 8.2 to 48 (8.2 ≤ x ≤ 48). The oxide phosphor can be, if the variable x in formula (1) lies in a range from 8.2 to 48 (8.2 ≤ x ≤ 48), an oxide phosphor with the composition represented by formula (1) in which the oxide phosphor with the composition represented by formula (1b) is combined in a range from 0.05 mol to 10 mol, based on 1 mol of the oxide phosphor with the composition represented by formula (1a).

[0034] The oxide phosphor with the composition represented by formula (1) contains an element M 4 In formula (1), together with Cr, it is an activating element. In the oxide phosphor with the composition represented by formula (1), the element M 4 at least one element selected from the group consisting of Ni, Ce, Eu, Fe, Mn, Nd, Tm, Ho, Er and Yb. In the oxide phosphor with the composition represented by formula (1), the element M 4 Ni as an essential element and at least one element selected from the group consisting of Ce, Eu, Fe, Mn, Nd, Tm, Ho, Er and Yb. In the oxide phosphor with the composition represented by formula (1), the element M 4 Ni be.

[0035] In the oxide phosphor, a variable z, which represents the molar fraction of element M, fulfills a function. 4in formula (1) represents a range from 0 to 0.3 (0 ≤ z ≤ 0.3), can satisfy a range from 0 to 0.2 (0 ≤ z ≤ 0.2) or can satisfy a range from 0 to 0.1 (0 ≤ z ≤ 0.1) if Li is taken as 1 or the sum of Li and M 1 is taken as 1. In a case where the element M 4 Since the oxide phosphor does not contain Ni, it does not necessarily contain the element M. 4 and can satisfy z = 0 (z = 0). In the oxide phosphor, in a case where the element M 4 In formula (1) containing two or more elements, the variable z represents the total molar proportion of the two or more elements that are in the element M 4 are contained in the oxide phosphor. In formula (1) z, which represents the molar fraction of element M 4where Cr represents an activating element, a smaller number than the variable y, which represents the molar fraction of Cr as an activating element (y > z). In the oxide phosphor, the variables y and z in formula (1) preferably satisfy a range of 1.5 to 50 (1.5 ≤ y / z ≤ 50), can satisfy a range of 2.0 to 40 (2.0 ≤ y / z ≤ 40), and can satisfy a range of 2.5 to 30 (2.5 ≤ y / z ≤ 30).

[0036] In the oxide phosphor, in a case where the variable t is 0 (t = 0), the variable t and the variable u, which represents the molar fraction of element M, are satisfied. 2 In formula (1), the variable u preferably has a range from 0.05 to 4 (0.05 ≤ u ≤ 4) and the variable w preferably has a range from 5.4 to 13 (5.4 ≤ w ≤ 13). In a case where the variable t is the element M 2In formula (1) where 0 is (t = 0), if the variable u fulfills a range from 0.05 to 4 (0.05 ≤ u ≤ 4) and the variable w fulfills a range from 5.4 to 13 (5.4 ≤ w ≤ 13), the oxide phosphor with the composition represented by formula (1) can emit light with a higher emission intensity in a wavelength range from red to near-infrared when irradiated with excitation light.

[0037] In the oxide phosphor, the condition is met when the variable s represents the molar fraction of element M. 1 represents 0 is (s = 0) and the variable t is 0 (t = 0), as the variable t and the variable u, which represent the molar part of the element M 2In formula (1), the variable u preferably has a range of 0.2 to 4.5 (0.2 ≤ u ≤ 4.5) and the variable w preferably has a range of 5.4 to 13 (5.4 ≤ w ≤ 13). In a case where the variable s is 0 (s = 0) and the variable t is 0 (t = 0) in formula (1), if the variable u has a range of 0.2 to 4.5 (0.2 ≤ u ≤ 4.5) and the variable w has a range of 5.4 to 13 (5.4 ≤ w ≤ 13), the oxide phosphor with the composition represented by formula (1) can, when irradiated with excitation light, emit light with a higher emission intensity in a wavelength range from red to near-infrared.

[0038] In the oxide phosphor, in a case where the element M 4 Ni in formula (1) is the variable z, which represents the molar fraction of element M 4represents, preferably a range of 0.001 to 0.2 (0.001 ≤ z ≤ 0.2), and more preferably satisfies a range of 0.002 to 0.1 (0.002 ≤ z ≤ 0.1) when Li is taken as 1 or the sum of Li and M 1 is taken as 1. In the composition represented by formula (1), in a case where the element M is absorbed 4 Given that Ni is and the variable z fulfills a range of 0.001 to 0.2 (0.001 ≤ z ≤ 0.2), first Cr absorbs the energy of the excitation light and the energy absorbed by Cr is transferred to Ni, thus effectively exciting Ni, and the oxide phosphor can emit light with an emission spectrum having a light emission peak wavelength in a wavelength range from red to near-infrared and a wide half-width.

[0039] In the oxide phosphor, the variables t and u, which represent the molar fraction of element M, can be used. 2In formula (1), the variable t can have a range of 0.4 to 0.6 (0.4 ≤ t ≤ 0.6) and the variable u can have a range of 0.2 to 5 (0.2 ≤ u ≤ 5). The oxide phosphor with the composition represented by formula (1), containing the element M 2 The oxide phosphor contained in formula (1), if the variable t has a range of 0.4 to 0.6 (0.4 ≤ t ≤ 0.6) and the variable u has a range of 0.2 to 5 (0.2 ≤ u ≤ 5), can emit light with an emission spectrum and a light emission peak wavelength in the range of 820 nm to 860 nm when irradiated with excitation light. 2The oxide phosphor containing the element M emits light with an emission spectrum with a peak wavelength and a wide full width at half maximum (FWHM) in the range of 200 nm to 280 nm when the variable t is within a range of 0.4 to 0.6 (0.4 ≤ t ≤ 0.6) and the variable u is within a range of 0.2 to 5 (0.2 ≤ u ≤ 5). 2 The compound contained in formula (1), if the variable t has a range of 0.4 to 0.6 (0.4 ≤ t ≤ 0.6) and the variable u has a range of 0.2 to 5 (0.2 ≤ u ≤ 5), can emit light with a peak wavelength in the range of 830 nm to 850 nm when irradiated with excitation light. 2in formula (1), if the variable t satisfies a range of 0.4 to 0.6 (0.4 ≤ t ≤ 0.6) and the variable u satisfies a range of 0.2 to 5 (0.2 ≤ u ≤ 5), it can emit light which has a light emission peak wavelength within a desired range, which facilitates non-destructive acquisition of in vivo information or information about agricultural products, fruits and vegetables and has excellent color rendering properties.

[0040] The element M can be found in the oxide phosphor 2 Zn is contained in formula (1). In the oxide phosphor, in a case where the element M 2 in formula (1) Zn contains, as the variable t and the variable u, which represents the molar fraction of element M 2 represent the variable t satisfying a range from 0.4 to 0.6 (0.4 ≤ t ≤ 0.6) and the variable u satisfying a range from 0.2 to 5 (0.2 ≤ u ≤ 5).

[0041] The oxide phosphor contains the element M 2 In formula (1) Zn, the variable t satisfies 1.0 (t = 1.0) and Mg is not necessarily included. The oxide phosphor contains the element M 2 in formula (1) Zn and can contain at least one element selected from the group consisting of Ca, Sr and Ba.

[0042] The oxide phosphor contains the element M 2 In formula (1) Zn, the variable t satisfies 1.0 (t = 1.0) and Mg is not necessarily included. In a case where the element M 2 In formula (1) Zn is and the variable t 1.0 (t = 1.0) is satisfied, the oxide phosphor, when irradiated with excitation light, preferably emits light with an emission spectrum with a light emission wavelength in a range of 700 nm to 860 nm.

[0043] The light-emitting device includes the oxide phosphor with the composition shown in formula (1) and a light-emitting element having a light emission peak wavelength in the range of 365 nm to 650 nm, which irradiates the oxide phosphor with excitation light. The oxide phosphor is preferably enclosed in a wavelength conversion element, and the wavelength conversion element may contain a transparent material.

[0044] A semiconductor element can be used as the light-emitting element that illuminates the oxide phosphor with excitation light. For example, a nitride semiconductor can be selected as the material for a light-emitting element that emits green and blue light. The material for a semiconductor structure that forms the light-emitting element can be... X Al Y Ga 1-X-YN (0 ≤ X ≤ 1, 0 ≤ Y ≤ 1, X + Y ≤ 1) or the like can be used. For example, a gallium-aluminum-arsenic-based semiconductor or an aluminum-indium-gallium-phosphorus-based semiconductor can be selected as the material for a light-emitting element that emits red light. For example, an LED chip or an LD chip is preferably used as the light-emitting element.

[0045] The light-emitting element can have a light emission peak wavelength in the range of 365 nm to 650 nm, a light emission peak wavelength in the range of 365 nm to 500 nm, a light emission peak wavelength in the range of 370 nm to 490 nm, and a light emission peak wavelength in the range of 375 nm to 480 nm. In another embodiment, the light-emitting element can have a light emission peak wavelength in the range of more than 500 nm to 650 nm, a light emission peak wavelength in the range of 510 nm to 650 nm, or a light emission peak wavelength in the range of 520 nm to 650 nm.The use of a light-emitting element as a source of excitation light for the oxide phosphor makes it possible to obtain a light-emitting device that emits mixed-color light in a desired wavelength range. This mixed-color light comprises light from the light-emitting element and fluorescence from a phosphor, including the oxide phosphor. The full width at half maximum (FWHM) of the light emission peak in the emission spectrum of the light-emitting element can be, for example, 30 nm or less. The light-emitting element is preferably, for example, one that utilizes a nitride-based semiconductor.A stable light-emitting device that exhibits high efficiency and high linearity of power output with respect to power input and is stable against mechanical influence can be manufactured by using a light-emitting element in which a nitride-based semiconductor is used as a source of excitation light.

[0046] The light-emitting device essentially includes a first phosphor containing the oxide phosphor described above and may further include a phosphor with a different composition. In addition to the first phosphor, the light-emitting device preferably includes at least one phosphor selected from the group consisting of a second phosphor with a light emission peak wavelength of 455 nm or more and less than 495 nm, a third phosphor with a light emission peak wavelength of 495 nm or more and less than 610 nm, a fourth phosphor with a light emission peak wavelength of 610 nm or more and less than 700 nm, and a fifth phosphor with a light emission peak wavelength of 700 nm or more and 1600 nm in the emission spectrum of each of the phosphors.If the light-emitting device includes a light-emitting element and the first phosphor containing the oxide phosphor described above, and also includes at least one phosphor selected from the group consisting of the second phosphor, the third phosphor, the fourth phosphor, and the fifth phosphor, the light-emitting device can be used as a light source exhibiting an emission spectrum in a wavelength range that includes a portion from the visible to the near-infrared wavelength range. The light-emitting device has an emission spectrum similar to that of known tungsten lamps and xenon lamps and can be used as a light source that allows for a reduction in size compared to tungsten lamps and xenon lamps.Such a small light-emitting device can be mounted on a small mobile device, such as a smartphone or smartwatch, and can be used to treat health conditions or the like when information is obtained in vivo.

[0047] Such a light-emitting device can be used, for example, in a device for reflection spectroscopic measurement or in a lighting device that can measure non-destructively inside a living body, fruits and vegetables, or the like, and which requires light with good color rendering properties.

[0048] The second phosphor, which has a composition different from the first phosphor, which includes the oxide phosphor described above, preferably includes at least one type of phosphor selected from the group consisting of a phosphate phosphor having a composition represented by formula (2a) below, an aluminate phosphor having a composition represented by formula (2b) below, and an aluminate phosphor having a composition represented by formula (2c) below, and the second phosphor may include two or more types of these phosphors. (Ca, Sr, Ba, Mg) 10 (PO4)6(F, Cl, Br, I)2:Eu (2a) (Ba, Sr, Ca)MgAl 10 O 17 :Eu (2b) Sr4Al 14 O 25 :Eu (2c)

[0049] In the present description, a multitude of elements in a composition formula separated by commas (,) means that at least one of the elements is included in the composition.

[0050] The third phosphor preferably includes at least one type of phosphor selected from the group consisting of a silicate phosphor having a composition represented by formula (3a) below, an aluminate phosphor or gallate phosphor having a composition represented by formula (3b) below, a β-sialon phosphor having a composition represented by formula (3c) below, a cesium halide phosphor having a composition represented by formula (3d) below, and a nitride phosphor having a composition represented by formula (3e) below, and the third phosphor may include two or more types of these phosphors.If the third phosphor includes two or more types of phosphors, the two or more types of third phosphors are preferably phosphors with light emission peak wavelengths in different ranges within a range of 495 nm or more and less than 610 nm. (Ca, Sr, Ba)8MgSi4O 16 (F, Cl, Br)2:Eu (3a) (Lu, Y Gd, Tb)3(Al, Ga)5O 12 :Ce (3b) Si 6-z Al z O z N 8-z :Eu (0 < z ≤ 4,2) (3c) CsPb(F, Cl, Br)3 (3d) (La, Y, Gd)3Si6N 11 :Ce (3e)

[0051] The fourth phosphor preferably includes at least one type of phosphor selected from the group consisting of a nitride phosphor having a composition represented by formula (4a) below, a fluorogermanate phosphor having a composition represented by formula (4b) below, an oxynitride phosphor having a composition represented by formula (4c) below, a fluoride phosphor having a composition represented by formula (4d) below, a fluoride phosphor having a composition represented by formula (4e) below, a nitride phosphor having a composition represented by formula (4f) below and a nitride phosphor having a composition represented by formula (4g) below, and the fourth phosphor may include two or more types of these phosphors.If the fourth phosphor includes two or more types of phosphors, the two or more types of fourth phosphors are preferably phosphors with light emission peak wavelengths in different ranges within a range of 610 nm or more and less than 700 nm. (Sr, Ca)AlSiN3:Eu (4a) 3.5 MgO 0.5 MgF2 GeO2:Mn (4b) (Ca, Sr, Mg) k Si 12-(m+n) Al m+n O n N 16-n :Eu (4c)

[0052] (In formula (4c) k, m and n satisfy 0 < k ≤ 2.0, 2.0 ≤ m ≤ 6.0 and 0 ≤ n ≤ 2.0.) A 1 c1 [M 6 1-b1 Mn 4+ b1 F d1 ] (4d)

[0053] (In formula (4d) A contains 1 at least one ion, selected from the group consisting of K + , Li + , N / a + , Rb + , Cs + and NH4 + , and among these K+ preferred. M 6 contains at least one element selected from the group consisting of elements of group 4 and elements of group 14, and among these Si and Ge are preferred. Furthermore, b1 satisfies 0 < b1 < 0.2, and c1 is an absolute value of the electric charge of [M 6 1-b1 Mn 4+ b1 F d1 ]-Ions and satisfies d1 5 < d1 < 7.) A 2 c2 [M 7 1-b2 Mn 4+ b2 F d2 ] (4e)

[0054] (In formula (4e) A contains 2 at least one ion, selected from the group consisting of K + , Li + , N / a + , Rb + , Cs + and NH4 + , and among these K + preferred. M 7contains an element of group 13 and may further contain at least one element selected from the group consisting of elements of group 4 and elements of group 14. The element of group 13 is preferably Al, and the element of group 14 is preferably Si. Furthermore, b2 satisfies 0 < b2 < 0.2, where c2 is an absolute value of the electric charge of [M]. 7 1-b2 Mn 4+ b2 Fd2]- (Ba, Sr, Ca)2SisN8:Eu (4f) (Sr, Ca)Li(Al, Ga)3N4:Eu (4g)

[0055] The fifth phosphor preferably includes at least one phosphor selected from the group consisting of a gallate phosphor having a composition represented by formula (5a) below, an aluminate phosphor having a composition represented by formula (5b) below, a phosphor having a composition represented by formula (5c) below which differs in composition from the oxide phosphor above, a phosphor having a composition represented by formula (5d) below which differs in composition from the oxide phosphor above, a phosphor having a composition represented by formula (5e) below which differs in composition from the oxide phosphor above, and a phosphor having a composition represented by formula (5f) below.which differs in composition from the aforementioned oxide phosphor, a phosphor with a composition represented by formula (5g) below, which differs in composition from the aforementioned oxide phosphor, a phosphor with a composition represented by formula (5h) below, which differs in composition from the aforementioned oxide phosphor, a phosphor with a composition represented by formula (5i) below, which differs in composition from the aforementioned oxide phosphor, a phosphor with a composition represented by formula (5j) below, which differs in composition from the aforementioned oxide phosphor, a phosphor with a composition represented by formula (5k) below, which differs in composition from the aforementioned oxide phosphor,a phosphor with a composition represented by the following formula (5l), which differs in composition from the preceding oxide phosphor, a phosphor with a composition represented by the following formula (5m), which differs in composition from the preceding oxide phosphor, and a phosphor with a composition represented by the following formula (5n), which differs in composition from the preceding oxide phosphor, and may include two or more types of these phosphors. ZnGa2O4:Cr (5a) (Lu, Y, Gd, Tb)3(Al, Ga)5O 12 :Ce,Cr (5b) M 8 g M 9 h M 10 i M 11 50 j :Cr e ,M 12 f (5c)

[0056] (In formula (5c) M 8at least one element, selected from the group consisting of Li, Na, K, Rb and Cs; is M 9 at least one element, selected from the group consisting of Mg, Ca, Sr, Ba and Zn; is M 10 at least one element, selected from the group consisting of B, Al, Ga, In and rare earth elements; is M 11 at least one element, selected from the group consisting of Si, Ti, Ge, Zr, Sn, Hf and Pb; is M 12 at least one element selected from the group consisting of Eu, Ce, Tb, Pr, Nd, Sm, Yb, Ho, Er, Tm, Ni and Mn; and satisfy e, f, g, h, i and j 0 < e ≤ 0.2, 0 ≤ f ≤ 0.1, f < e, 0.7 ≤ g ≤ 1.3, 1.5 ≤ h ≤ 2.5, 0.7 ≤ i ≤ 1.3 and 12.9 ≤ j ≤ 15.1.) (Ga 1-u4 M 13 u4 )2(Ge 1-v4 M 14 v4 ) w4 O x4 :Cr y4 ,M 15 z4 (5d)

[0057] (In formula (5d) M 13at least one element, selected from the group consisting of Al, Sc and In; is M 14 at least one element, selected from the group consisting of Si, Ti, Zr, Sn and Hf; is M 15 at least one element selected from the group consisting of Ni, Eu, Fe, Mn, Nd, Tm, Ho, Er and Yb; and satisfy u4, v4, w4, x4, y4 or z4 0 ≤ u4 ≤ 1.0, 0 ≤ v4 ≤ 0.5, 1.0 ≤ w4 ≤ 3.0, 5 ≤ x4 ≤ 9, 0.005 ≤ y4 ≤ 1.0 or 0 ≤ z4 ≤ 0.5.) (Mg 1-s5 M 16 s5 )2(Al 1-t5 M 17 t5 ) u5 (Ge 1-v5 M 18 v5 ) w5 O x5 :Cr y5 ,M 19 z5 (5e)

[0058] (In formula (5e) M 16 at least one element, selected from the group consisting of Ca, Sr, Ba and Zn; is M 17 at least one element, selected from the group consisting of Ga, Sc and In; is M 18at least one element, selected from the group consisting of Si, Ti, Zr, Sn and Hf; is M 19 at least one element selected from the group consisting of Ni, Ce, Eu, Fe, Mn, Nd, Tm, Ho, Er and Yb; and satisfy s5, t5, u5, v5, w5, x5, y5 or z5 0 ≤ s5 ≤ 1.0, 0 ≤ t5 ≤ 1.0, 1.5 ≤ u5 ≤ 2.5, 0 ≤ v5 ≤ 0.5, 3.0 ≤ w5 ≤ 6.0, 11.0 ≤ x5 ≤ 17.0, 0.005 ≤ y5 ≤ 1.0 or 0 ≤ z5 ≤ 0.5.) M 20 x6 (Al 1-y6 M 21 y6 )z6O x6+3 / 2z6 :Cr v6 ,M 22 w6 (5f)

[0059] (In formula (5f) M 20 at least one element selected from the group consisting of alkaline earth metal elements; is M 21 at least one element, selected from the group consisting of elements of group 13, excluding Al; is M 22at least one element selected from the group consisting of Mn, Eu, Ce, Tb, Pr, Nd, Sm, Yb, Ho, Er and Tm; and satisfy v6, w6, x6, y6 and z6 0.004 ≤ v6 ≤ 0.8, 0 ≤ w6 ≤ 0.4, 0.004 ≤ v6 + w6 ≤ 0.8, 1.0 ≤ x6 ≤ 4.0, 0 ≤ y6 ≤ 0.7 and 4.0 ≤ z6 ≤ 1.50.) M 23 t7 M 24 u7 (Ge 1-v7 M 25 v7 )6O w7 :Cr x7 ,M 26 y7 (5g)

[0060] (In formula (5g) M 23 at least one element, selected from the group consisting of Li, Na, K, Rb and Cs; is M 24 at least one element, selected from the group consisting of Ca, Sr, Mg, Ba and Zn; is M 25 at least one element, selected from the group consisting of Si, Ti, Zr, Sn, Hf and Pb; is M 26at least one element selected from the group consisting of Eu, Ce, Tb, Pr, Nd, Sm, Yb, Ho, Er, Tm, Ni and Mn; and satisfy t7, u7, v7, w7, x7 and y7 1.5 ≤ t7 ≤ 2.5, 0.7 ≤ u7 <_ 1.3, 0 ≤ v7 ≤ 0.4, 12.9 ≤ w7 ≤ 15.1, 0 < x7 ≤ 0.2, 0 ≤ y7 ≤ 0.10 and y7 < x7.) (Li 1-u8 M 27 u8 )4(Ge 1-v8 M 28 v8 ) w8 O x8 :Cr y8 ,M 29 z8 5h)

[0061] (In formula (5h) M 27 at least one element, selected from the group consisting of Na, K, Rb and Cs; is M 28 at least one element, selected from the group consisting of Si, Ti, Zr, Sn and Hf; is M 29 at least one element selected from the group consisting of Ni, Eu, Fe, Mn, Nd, Tm, Ho, Er and Yb; and satisfy u8, v8, w8, x8, y8 or z8 0 ≤ u8 ≤ 0.3, 0 ≤ v8 ≤ 0.5, 3.5 ≤ w8 ≤ 15, 9 ≤ x8 < 32, 0.005 ≤ y8 ≤ 1.0 or 0 ≤ z8 ≤ 0.5.) (Li 1-u9 M 30u9 )2M 31 v9 M 32 w9 O x9 :Cr y9 ,M 33 z9 (5i)

[0062] (In formula (5i) M 30 at least one element, selected from the group consisting of Na, K, Rb and Cs; is M 31 at least one element, selected from the group consisting of Mg, Ca, Sr, Ba and Zn; is M 32 at least one element, selected from the group consisting of Si, Ge, Ti, Zr, Sn and Hf; is M 33 at least one element selected from the group consisting of Ni, Eu, Fe, Mn, Nd, Tm, Ho, Er and Yb; and satisfy u9, v9, w9, x9, y9 or z9 0 ≤ u9 ≤ 1.0, 0.8 ≤ v9 ≤ 3.0, 1.8 ≤ w9 ≤ 6, 5.4 ≤ x9 < 16, 0.005 ≤ y9 ≤ 1.0 or 0 ≤ z9 ≤ 0.5.) (Mg 1-p10 M 34 p10 ) q10 (Li 1-r10 M 35 r10 ) s10 (In 1-t10 M 36 t10 ) u10 (Ge 1-v10 M 37 v10 )w10 O x10 :Cr y10 ,M 38 z10 (5 years)

[0063] (In formula (5j) M 34 at least one element, selected from the group consisting of Ca, Sr, Ba and Zn; is M 35 at least one element, selected from the group consisting of Na, K, Rb and Cs; is M 36 at least one element, selected from the group consisting of Al, Ga and Sc; is M 37 at least one element, selected from the group consisting of Si, Ti, Zr, Sn and Hf; is M 38 at least one element selected from the group consisting of Ni, Ce, Eu, Fe, Mn, Nd, Tm, Ho, Er and Yb; and satisfy p10, q10, r10, s10, t10, u10, v10, w10, x10, y10 and z100 ≤ p10 ≤ 1.0, 0.1 ≤ q10 ≤ 0.9, 0 ≤ r10 ≤ 1.0, 0.05 ≤ s10 ≤ 0.45, 0 ≤ t10 ≤ 0.5, 0.05 ≤ u10 ≤ 0.45, 0 ≤ v10 ≤ 1.0, 0.8 ≤ w10 ≤ 1.3, 2.6 ≤ x10 ≤ 3.6, 0.02 ≤ y10 ≤ 0.5, 0 ≤ z10 ≤ 0.3 and 0.9 ≤ q10 + s10+ u10 ≤ 1.2.) (Li 1-q11 M 39q11 ) r11 (Mg 1-s11 M 40 s11 ) t11 (Ta 1-u11 - v11 Note u11 M 41 v11 ) w11 O x11 :Cr y11 ,M 42 z11 (5k)

[0064] (In formula (5k) M 39 at least one element, selected from the group consisting of Na, K, Rb and Cs; is M 40 at least one element, selected from the group consisting of Zn, Ca, Sr and Ba; is M 41 at least one element, selected from the group consisting of P, V, Sb and Bi; is M 42 at least one element selected from the group consisting of Ni, Ce, Eu, Fe, Mn, Nd, Tm, Ho, Er and Yb; and satisfy q11, r11, s11, t11, u11, v11, w11, x11, y11 and z11 0 ≤ q11 ≤ 0.5, 0.5 ≤ r11 ≤ 3.5, 0 ≤ s11 ≤ 0.5, 1.8 ≤ t11 ≤ 3.2, 0 ≤ u11 ≤ 1.0, 0 ≤ v11 ≤ 0.3, 0 ≤ u11 + v11 ≤ 1.0, 0.8 ≤ w11 ≤ 1.2, 5.1 ≤ x11 ≤ 6.9, 0.002 ≤ y11 ≤ 0.5 and 0 ≤ z11 ≤ 0.3.) (Ga 1-v12 M43 v12 )2O3:Cr x12 (5I)

[0065] (In formula (5I) M 13 at least one element selected from the group consisting of Al, In and rare earth elements; and satisfy v12 or x12 0 ≤ v12 ≤ 1.0 or 0.02 ≤ x12 ≤ 0.3.) (Li 1-t13 M 44 t13 ) u13 (Ga 1-v13 M 45 v13 )50 w13 :Cr x13 ,Ni y13 ,M 46 z13 (5m)

[0066] (In formula (5m) M 44 at least one element, selected from the group consisting of Na, K, Rb and Cs; is M 45 at least one element, selected from the group consisting of B, Al, In and rare earth elements; is M 46at least one element, selected from the group consisting of Si, Ge, Sn, Ti, Zr, Hf, Bi, V, Nd and Ta; and satisfy t13, u13, v13, w13, x13, y13 and z13 0 ≤ t13 ≤ 1.0, 0.7 ≤ u13 ≤ 1.6, 0 ≤ v13 < 1.0, 7.85 ≤ w13 ≤ 11.5, 0.05 ≤ x13 ≤ 1.2, 0 ≤ y13 ≤ 0.5, 0.25 < x13 + y13 ≤ 1.2, x13 > y13 and 0 ≤ z13 ≤ 0.5.) (Mg 1-t14 M 47 t14 ) u14 (Ga 1-v14-x14-y4 M 48 v14 )2O w14 :Cr x14 ,M 41 y 14 (5n)

[0067] (In formula (5n) M 47 at least one element, selected from the group consisting of Ca, Sr, Ba, Ni and Zn; is M 48 at least one element, selected from the group consisting of B, Al, In and Sc; is M 49at least one element selected from the group consisting of Eu, Ce, Tb, Pr, Nd, Sm, Yb, Ho, Er, Tm and Mn; and satisfy t14, u14, v14, w14, x14 or y14 0 ≤ t14 ≤ 0.8, 0.7 ≤ u14 ≤ 1.3, 0 ≤ v14 < 0.8, 3.7 ≤ w14 ≤ 4.3, 0.02 < x14 ≤ 0.3, 0 ≤ y14 ≤ 0.2 or x14 > y14.)

[0068] An example of the light-emitting device is described with reference to the drawings. Fig. Figure 1 is a schematic cross-sectional view illustrating an example of a first configurative example of a light-emitting device. Fig. Figure 2 is a schematic cross-sectional view illustrating another example of the first configurative example for the light-emitting device.

[0069] As in Fig.As illustrated in Figure 1, a light-emitting device 100 comprises a molded body 40 with a recessed portion, a light-emitting element 10 serving as an excitation light source, and a wavelength conversion element 50 covering the light-emitting element 10. The molded body 40 is formed by the integrated molding of a first supply line 20, a second supply line 30, and a resin portion 42 containing a thermoplastic or thermosetting resin. Within the molded body 40, at least the first supply line 20 and the second supply line 30 form a surface that defines a bottom surface of the recessed portion, and at least the resin portion 42 forms a surface that defines a side surface of the recessed portion. The light-emitting element 10 is mounted on the surface that defines the bottom surface of the recessed portion of the molded body 40.The light-emitting element 10 includes a pair of positive and negative electrodes, respectively, and these pairs are electrically connected to the first supply line 20 and the second supply line 30 via wires 60. The light-emitting element 10 is covered with the wavelength conversion element 50. The wavelength conversion element 50 preferably includes a phosphor 70, which converts the wavelength of the light emitted from the light-emitting element 10, and a translucent material. The phosphor 70 includes, as an essential component, a first phosphor 71, which includes an oxide phosphor. The oxide phosphor enclosed in the first phosphor 71 contains an oxide phosphor with the composition shown in formula (1). The phosphor 70 can include a phosphor with a composition different from that of the first phosphor 71. As shown in . Fig. As illustrated in Figure 2, the phosphor 70 preferably includes at least one type of phosphor selected from the group consisting of a second phosphor 72, a third phosphor 73, a fourth phosphor 74, and a fifth phosphor 75 described above, and may include two or more types of these phosphors. The phosphor 70 includes the first phosphor 71 as an essential component and may include the second phosphor 72, the third phosphor 73, the fourth phosphor 74, and the fifth phosphor 75. The wavelength conversion element 50 also serves as a component for protecting the light-emitting element 10, the wire 60, the phosphor 70, and the like from the external environment. The light-emitting device 100 receives an external energy supply via the first supply line 20 and the second supply line 30 and thereby emits light.

[0070] The Fig. 3 and Fig. Figure 4 illustrates a second configurational example of a light-emitting device. Fig. Figure 3 is a schematic top view illustrating a light-emitting device 200. Fig. Figure 4 is a schematic cross-sectional view along line III-III' of the light-emitting device 200, which is in Fig.Figure 3 illustrates this. The light-emitting device 200 includes a light-emitting element 10 with a light emission peak wavelength in the range of 365 nm to 650 nm and a wavelength conversion element 51. The wavelength conversion element 51 includes a wavelength conversion body 52, which includes a first phosphor 71 that is excited by light from the light-emitting element 10 to emit light, and a translucent body 53 arranged on a surface side of the emission of the wavelength conversion body 52. ​​The light-emitting element 10 is flip-chip mounted on a substrate 12 via a raised contact surface (bump) that is a conductive component 61. The wavelength conversion body 52 of the wavelength conversion element 51 is arranged on the light-emitting surface of the light-emitting element 10 via an adhesive layer 80.The lateral surfaces of the light-emitting element 10 and the wavelength conversion element 51 are covered with a light-reflecting cover component 90. The wavelength conversion body 52 is adapted to be excited by light from the light-emitting element 10 and essentially includes a first phosphor 71, which includes an oxide phosphor, which includes phosphor particles, a host crystal containing Ga and oxygen, an activating element, and first compound particles and / or second compound particles arranged on the surfaces of the phosphor particles.The oxide phosphor enclosed in the first phosphor 71 contains at least one type of phosphor particle selected from the group consisting of phosphor particles with the composition represented by formula (1), phosphor particles with the composition represented by formula (2), and phosphor particles with the composition represented by formula (3). The oxide phosphor enclosed in the first phosphor may include two or more types of oxide phosphors containing phosphor particles with different compositions. The wavelength conversion body 52 may include at least one type of phosphor selected from the group consisting of the second phosphor, the third phosphor, the fourth phosphor, and the fifth phosphor.The light-emitting element 10 receives energy from outside the light-emitting element 200 through the conductive components 61 and a conductive component formed on the substrate 12, causing the light-emitting device 200 to emit light. The light-emitting device 200 may include a semiconductor element 11, such as a protective element to safeguard the light-emitting element 10 from damage caused by the application of excessive voltage. The semiconductor element 11 may be mounted on the substrate 12 above the conductive component 61. The covering component 90 is arranged, for example, to cover the semiconductor element 11. Each of the components used in the light-emitting device is described below. For further details, reference may be made, for example, to the disclosure in Japanese Patent Publication No. 2014-112635 A.

[0071] Examples of the translucent material that, together with the phosphor, forms the wavelength conversion element include at least one material selected from the group consisting of resin, glass, and an inorganic substance. The resin may be at least one type selected from the group consisting of silicone resin, epoxy resin, phenolic resin, polycarbonate resin, acrylic resin, and modified resins thereof. Silicone resin and modified silicone resin are preferred due to their good heat and light resistance. In addition to the phosphors and the translucent material, the wavelength conversion element may contain a filler, a dye, and a light-scattering material, as necessary. Examples of fillers include silicon dioxide, barium titanate, titanium dioxide, and aluminum oxide.

[0072] A plate-shaped body made of a translucent material, such as glass or resin, can be used as the translucent body. Examples of glass include borosilicate glass and fused silica. Examples of resin include silicone resin and epoxy resin. If the wavelength conversion element includes a substrate, the substrate preferably consists of an insulating material that does not readily allow light from the light-emitting element or external light to pass through. Examples of substrate materials include ceramics, such as aluminum oxide and aluminum nitride, and resins, such as phenolic resin, epoxy resin, polyimide resin, bismaleimide triazine resin (BT resin), and polyphthalamide resin (PPA).When an adhesive layer is arranged between the light-emitting element and the wavelength conversion element, the adhesive forming the layer preferably consists of a material capable of optically coupling the light-emitting element and the wavelength conversion element. The material forming the adhesive layer is preferably at least one type of resin selected from the group consisting of epoxy resin, silicone resin, phenolic resin, and polyimide resin. The light-transmitting body is not necessarily arranged on the wavelength conversion element.

[0073] Examples of semiconductor elements provided as necessary in the light-emitting device include a transistor for regulating the light-emitting element and a protective element to reduce damage to or degradation of the light-emitting element's performance due to the application of excessive voltage. An example of a protective element is a Zener diode. If the light-emitting device includes a covering element, an insulating material is preferably used as the covering element material. More specific examples of covering element materials include phenolic resin, epoxy resin, bismaleimide triazine resin (BT resin), polyphthalamide resin (PPA), and silicone resin. A dye, phosphor, or filler may be added to the covering element as needed. A bump may be used as the conductive element in the light-emitting device.Au or an Au alloy can be used as the material for the bump, and eutectic solder (Au-Sn), Pb-Sn, lead-free solder or the like can be used as the other conductive component.

[0074] An example of a method for manufacturing a light-emitting device according to the first configurative example is described. For details, reference may be made, for example, to the disclosure of Japanese Patent Publication No. 2010-062272 A. The method for manufacturing the light-emitting device preferably includes a step of providing a molded body, a step of arranging a light-emitting element, a step of arranging a composite material forming a wavelength conversion element, and a step of forming a resin assembly. In a case where a collective molded body comprising a plurality of recessed parts is used as the molded body, a singulation step may be included after the resin assembly formation step to separate the resin assembly into the respective unit areas.

[0075] In the molding step, a variety of feed lines are integrated and molded, using a thermoset or thermoplastic resin to create a molded body that includes a recessed part with surfaces defining the sides and bottom of the recessed part. The molded body can be formed from a collective base component that includes a variety of recessed parts.

[0076] In the step of arranging the light-emitting element, the light-emitting element is positioned on the surface that defines the underside of the recessed part of the molded body, and the positive and negative electrodes of the light-emitting element are connected to the first lead and the second lead via wires.

[0077] In the step of arranging the composition to form the wavelength conversion element, the composition to form the wavelength conversion element is arranged in the recessed part of the molded body.

[0078] In the resin assembly step, the composition for forming the wavelength conversion element is cured in the recessed portion of the molded body to form the resin assembly, thus producing the light-emitting device. If a molded body is used that is composed of a collective base component including a plurality of recessed parts, after the resin assembly step, the collective base component including the plurality of recessed parts is separated into each resin assembly in each unit area in the singulation step, thus producing individual light-emitting devices. In this way, the light-emitting device, which is in Fig. 1 or Fig. 2 is illustrated, to be produced.

[0079] An example of a method for manufacturing a light-emitting device of the second configuration example is now described. For details, reference may be made, for example, to the disclosure of Japanese Patent Publication No. 2014-112635 A or Japanese Patent Publication No. 2017-117912 A. The method for manufacturing the light-emitting device preferably includes a step of arranging a light-emitting element, a step of arranging a semiconductor element as necessary, a step of forming a wavelength conversion element that includes a wavelength conversion body, a step of bonding the light-emitting element and the wavelength conversion element, and a step of forming a covering component.

[0080] For example, in the step of arranging the light-emitting element, the light-emitting element is placed on a substrate. The light-emitting element and the semiconductor element are, for example, flip-chip mounted on the substrate. Subsequently, in the step of forming the wavelength conversion element, which includes the wavelength conversion body, the wavelength conversion body can be obtained by forming a plate-shaped, film-shaped, or layer-shaped wavelength conversion body on the surface of a translucent body using a printing process, an adhesive process, a compression molding process, or an electrolytic deposition process.For example, in the printing process, a wavelength conversion element, which includes a wavelength conversion body, can be used by printing a composite material forming a wavelength conversion body that includes a phosphor and a resin serving as a binder or solvent, onto the surface of a translucent body. Subsequently, in the step of bonding the light-emitting element and the wavelength conversion element, the wavelength conversion element is bonded to the light-emitting element by an adhesive layer, with the wavelength conversion element facing the light-emitting surface of the light-emitting element. Finally, in the step of forming the covering component, the side faces of the light-emitting element and the wavelength conversion element are covered with the composite material for the covering component.The covering component reflects light emitted by the light-emitting element and is preferably shaped such that, if the light-emitting device further includes a semiconductor element, the semiconductor element is embedded in the covering component. In this way, the light-emitting device, which is in . Fig. 3 and Fig. 4 is illustrated, and can be produced.

[0081] A method for producing an oxide phosphor includes providing a starting material mixture containing a first compound containing Li, a second compound containing Mg, and / or a third compound containing the element M 2 contains, a fourth compound containing Ga, or a fifth compound containing the element M 3contains, and includes a sixth compound containing Cr, and heat-treating the starting material mixture at a temperature in the range of 1200 °C to 1700 °C in an atmosphere containing oxygen to produce an oxide phosphor.

[0082] The starting material mixture can consist of a second compound containing Mg, or a third compound containing the element M. 2 contains. The starting material mixture can consist of the fourth compound, which contains Ga, or the fifth compound, which contains the element M. 3 contains, included.

[0083] The starting material mixture can contain a seventh compound, which includes the element M 1 , as is necessary, contains, and an eighth compound that includes the element M 4 , as necessary, contains, includes.

[0084] In the starting material mixture, the second compound containing Mg and / or the third compound containing the element M 2 contains, preferably adjusted and mixed in such a way that, when the molar fraction of Li or the molar fraction of the sum of Li and M 1 When 1 in 1 mol of the composition of the oxide phosphor to be obtained is taken, the molar fraction u is the molar fraction of Mg, the molar fraction of the element M. 2 or the molar fraction of the sum of Mg and the element M 2 is in a range of 0.05 to 10 (0.05 ≤ u ≤ 10). In the starting material mixture, if the molar fraction of the sum of Mg and the element M 2 If is taken as 1, the starting material mixture can be obtained by determining the molar fraction t of element M. 2 It is set so that it lies in a range from 0 to 1.0 (0 ≤ t ≤ 1.0). If the molar fraction of the sum of Mg and the element M 2If taken as 1, then in a case where the molar fraction t of element M 2 If the initial material mixture exceeds 0, the third compound containing the element M 2 contains, contains. If the molar fraction of the sum of Mg and the element M 2 If taken as 1, then in a case where the molar fraction t of element M is... 2 If the starting material mixture is 1.0, the second compound containing Mg is not necessarily the same.

[0085] The starting material mixture contains the fourth compound, which contains Ga, and / or the fifth compound, which contains the element M. 3 contains, preferably adjusted and mixed in such a way that, when the molar fraction of Li or the molar fraction of the sum of Li and M 1 When taken as 1 in 1 mol of the composition of the oxide phosphor to be obtained, the molar fraction w is the molar fraction of Ga, the molar fraction of element M. 3or the molar fraction of the sum of Ga and the element M 3 is in the range of 5.1 to 25 (5.1 ≤ w ≤ 25). In the starting material mixture, if the molar fraction of the sum of Ga and the element M 3 If 1 is taken as the starting material mixture, it can be obtained by changing the molar fraction v of element M. 3 It is set so that it lies in a range from 0 to 1.0 (0 ≤ v ≤ 1.0). If the molar fraction of the sum of Ga and the element M 3 If taken as 1, then in a case where the molar fraction v of element M 3 If the initial material mixture exceeds 0, it contains a fifth compound, which is the element M. 3 contains, contains. If the entire molar fraction consists of Ga and the element M 3 If taken as 1, then in a case where the molar fraction t of element M is... 3 If the value is 1.0, the starting material mixture does not necessarily contain the fourth compound, which contains Ga.

[0086] The starting material mixture contains at least one compound selected from the group consisting of the second compound containing Mg and the third compound containing element M 2 contains, and at least one compound selected from the group consisting of the fourth compound containing Ga, and the fifth compound containing the element M 3 contains, preferably adjusted and mixed in such a way that, when the molar fraction of Li or the molar fraction of the sum of Li and M 1 When 1 in 1 mol of the composition of the oxide phosphor to be obtained is taken, the ratio (u / w) of the molar fraction u, which is the molar fraction of Mg, the molar fraction of the element M 2 or the molar fraction of the sum of Mg and the element M 2 is, to the molar fraction w, which is the molar fraction of Ga, the molar fraction of element M 3 or the molar fraction of the sum of Ga and the element M3 is in a range of 0.005 to 0.4 (0.005 ≤ u / w ≤ 0.4).

[0087] In the starting material mixture, the starting materials are preferably adjusted and mixed in such a way that, if the molar fraction of Li or the molar fraction of the sum of Li and M 1 As 1 in 1 mol of the composition of the oxide phosphor to be obtained is taken, the molar fraction y of Cr, based on the molar fraction of Li or the molar fraction of the sum of Li and M 1 , lies in a range of 0.02 to 0.5 (0.02 ≤ y ≤ 0.5).

[0088] In the starting material mixture, the seventh compound, which contains the element M, can be found 1 contains, adjusted and mixed in such a way that, when the molar fraction of the sum of Li and the element M 1 Taken as 1, the molar fraction s of element M 1in a range of 0 to 0.5 (0 ≤ s ≤ 0.5). If the molar fraction of the sum of Li and the element M 1 If taken as 1, then in a case where the molar fraction s of element M 1 If the initial material mixture exceeds 0, the seventh compound, which contains the element M, is formed. 1 contains, included.

[0089] The eighth compound, which contains the element M, can be found in the starting material mixture. 4 contains, adjusted and mixed in such a way as is required that, if the molar fraction of Li or the molar fraction of the sum of Li and the element M 1 When 1 in 1 mol of the composition of the oxide phosphor to be obtained is taken, the molar fraction z of element M 4 in a range of 0 to 0.3 (0 ≤ z ≤ 0.3), based on the molar fraction of Li or the molar fraction of the sum of Li and M 1 , lies. If the molar fraction z of element M 4If the initial material mixture exceeds 0, the eighth compound, which contains the element M, can be formed. 4 contains. The eighth compound, which contains the element M, can be found in the starting material mixture. 4 contains, adjusted and mixed in such a way as is required so that the molar fraction z of element M 4 smaller than the molar fraction y of Cr (y > z).

[0090] The first compound containing Li, the second compound containing Mg, and / or the third compound containing the element M 2 contains the fourth compound containing Ga, and / or the fifth compound containing the element M 3 contains, the sixth compound containing Cr, the possibly included seventh compound containing the element M 1 contains, and the eighth compound, if any, containing the element M 4The starting materials contained therein are preferably oxides, carbonates, chlorides or hydrates thereof.

[0091] The first compound containing Li, the second compound containing Mg, and / or the third compound containing the element M 2 contains the fourth compound containing Ga, and / or the fifth compound containing the element M 3 contains, the sixth compound containing Cr, the possibly included seventh compound containing the element M 1 contains, and the eighth compound, if any, containing the element M 4 The components, which serve as the starting materials, can be mixed using a mixer to obtain a mixture of starting materials. Besides a ball mill commonly used in industry, a vibratory mill, a roller mill, a jet mill, or similar equipment can be used as a mixer.

[0092] The starting material mixture can include a flux. If the starting material mixture includes a flux, the reaction between the starting materials is further promoted, and the solid-phase reaction proceeds more uniformly, thereby enabling the obtaining of a phosphor with a large particle size and improved light emission properties. If the temperature of the heat treatment to obtain the phosphor is essentially equivalent to the temperature at which the liquid phase of the compound used as the flux is formed, the reaction between the starting materials is promoted by the flux. A halide containing at least one element selected from the group consisting of rare-earth elements, alkaline earth metal elements, and alkali metal elements can be used as the flux. Of the halides, a fluoride can be used as the flux.If the element contained in the flux is the same element as at least one of the elements that make up the oxide phosphor, the flux can be added as part of the starting materials for the oxide phosphor with the target composition in such a way that the composition of the oxide phosphor becomes the target composition, or the flux can be added further after the starting materials have been mixed to form the target composition.

[0093] The starting material mixture can be placed in a crucible or boat made of carbon, such as graphite, or of a material such as boron nitride (BN), aluminum oxide (Al2O3), tungsten (W) or molybdenum (Mo) and then heat-treated in a furnace.

[0094] The heat treatment is preferably carried out in an atmosphere containing oxygen. The oxygen content of the atmosphere is not particularly limited. The oxygen content is preferably 5% by volume or more, more preferably 10% by volume or more, and even more preferably 15% by volume or more. The heat treatment is preferably carried out in an air atmosphere (oxygen content of 20% by volume or more). If the atmosphere contains no oxygen, i.e., the oxygen content is less than 1% by volume, in some cases it may not be possible to obtain an oxide phosphor with the desired composition.

[0095] The temperature for the heat treatment is in the range of 1200 °C to 1700 °C, preferably in the range of 1250 °C to 1650 °C, and more preferably in the range of 1300 °C to 1600 °C. If the temperature of the heat treatment is in the range of 1200 °C to 1700 °C, the decomposition due to the heat is inhibited, and an oxide phosphor with the target composition and a stable crystal structure is obtained.

[0096] In heat treatment, a holding time at a predetermined temperature can be provided. This holding time can be, for example, in a range of 0.5 to 48 hours, 1 to 40 hours, or 2 to 30 hours. Crystal growth can be promoted by setting the holding time within this range.

[0097] The pressure of the heat treatment atmosphere can be normal pressure (0.101 MPa), 0.101 MPa or higher, or a pressurized atmosphere in the range of 0.11 MPa to 200 MPa. In cases where the heat treatment temperature is high, the crystal structure of the heat-treated product is easily disrupted.

[0098] However, the decomposition of the crystal structure can be inhibited by carrying out the heat treatment in a pressurized atmosphere.

[0099] The duration of the heat treatment can be appropriately selected depending on the temperature and atmospheric pressure during the heat treatment and is preferably in the range of 0.5 to 20 hours. Even if the heat treatment is carried out in two or more steps, the duration of each step is preferably in the range of 0.5 to 20 hours. When the heat treatment duration is in the range of 0.5 to 20 hours, the decomposition of the resulting heat-treated product is inhibited, and a phosphor with a stable crystal structure and the desired emission intensity can be obtained. Furthermore, production costs can be reduced, and the production time can be shortened accordingly.The duration of the heat treatment is preferably in the range of 1 hour to 10 hours and even more preferably in the range of 1.5 hours to 9 hours.

[0100] The heat-treated product obtained through heat treatment can undergo further processing, such as comminution, dispersion, solid-liquid separation, or drying. Solid-liquid separation can be carried out using a method commonly employed in industrial applications, such as filtration, suction filtration, pressure filtration, centrifugation, or decantation. Drying can be performed using equipment commonly employed in industrial applications, such as a vacuum dryer, a hot air dryer, a conical dryer, or a rotary evaporator. Examples

[0101] The subject matter of this disclosure is specifically described below by means of examples. However, this disclosure is not limited to these examples. Example 1

[0102] Starting materials are weighed to produce 0.74 g Li2CO3, 0.16 g MgO, 10.1 g Ga2O3 and 0.31 g Cr2O3 (the target composition is LiMg). 0,2 Ga 5,4 O 8,8 :Cr 0,20 , and in the present description, in the target composition or the composition represented by formula (1), the molar fraction of an element whose numerical value for the molar fraction is not described is 1. Furthermore, the molar fraction of Cr or the molar fraction of element M is 4in the target composition or the composition represented by formula (1), the molar fraction is based on Li (if Li is taken as 1). The starting materials are then mixed for about 10 minutes using an agate mortar and pestle to produce a starting material mixture. The resulting starting material mixture is placed in an aluminum oxide crucible and heat-treated for 6 hours at 1500 °C in an air atmosphere (oxygen content 20 vol%) at atmospheric pressure (0.101 MPa).

[0103] After heat treatment, the heat-treated product is crushed to produce an oxide phosphor according to Example 1 with molar proportions equal to those of the target composition.

[0104] The oxide phosphor according to Example 1 and the oxide phosphors according to Examples 2 to 37 described below have the compositions listed in Table 1 and the composition represented by formula (1). In the oxide phosphor according to Example 1, in formula (1) the variable s is 0 (s = 0), the variable t is 0 (t = 0), the variable u is 0.2 (u = 0.2), the variable v is 0 (v = 0), the variable w is 5.4 (w = 5.4), the variable x is 8.8 (x = 8.8), the variable y is 0.20 (y = 0.20), and the variable z is 0 (z = 0). Example 2

[0105] An oxide phosphor according to Example 2 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 0.16 g MgO, 10.1 g Ga2O3 and 0.40 g Cr2O3 (the target composition is LiMg). 0,2 Ga 5,4 O 8,8 :Cr 0,26 ).

[0106] In the oxide phosphor according to Example 2, in formula (1) the variable s is 0 (s = 0), the variable t is 0 (t = 0), the variable u is 0.2 (u = 0.2), the variable v is 0 (v = 0), the variable w is 5.4 (w = 5.4), the variable x is 8.8 (x = 8.8), the variable y is 0.26 (y = 0.26) and the variable z is 0 (z = 0). Example 3

[0107] An oxide phosphor according to Example 3 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 0.28 g MgO, 10.7 g Ga2O3 and 0.31 g Cr2O3 (the target composition is LiM9). 0,35 Ga 5,7 O 9,4 :Cr 0,20 ).

[0108] In the oxide phosphor according to example 3, in formula (1) the variable s is 0 (s = 0), the variable t is 0 (t = 0), the variable u is 0.35 (u = 0.35), the variable v is 0 (v = 0), the variable w is 5.7 (w = 5.7), the variable x is 9.4 (x = 9.4), the variable y is 0.20 (y = 0.20) and the variable z is 0 (z = 0). Example 4

[0109] An oxide phosphor according to Example 4 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 0.28 g MgO, 10.7 g Ga2O3 and 0.40 g Cr2O3 (the target composition is LiMg). 0,35 Ga 5,7 O 9,4 :Cr 0,26 ).

[0110] In the oxide phosphor according to example 4, in formula (1) the variable s 0 (s = 0), the variable t 0 (t = 0), the variable u 0.35 (u = 0.35), the variable v 0 (v = 0), the variable w 5.7 (w = 5.7), the variable x 9.4 (x = 9.4), the variable y 0.26 (y = 0.26) and the variable z 0 (z = 0). Example 5

[0111] An oxide phosphor according to Example 5 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 0.41 g MgO, 11.2 g Ga2O3 and 0.31 g Cr2O3 (the target composition is LiMg). 0,5 Ga6O 10 :Cr 0,20 ).

[0112] In the oxide phosphor according to example 5, in formula (1) the variable s 0 (s = 0), the variable t 0 (t = 0), the variable u 0.5 (u = 0.5), the variable v 0 (v = 0), the variable w 6 (w = 6), the variable x 10 (x = 10), the variable y 0.20 (y = 0.20) and the variable z 0 (z = 0). Example 6

[0113] An oxide phosphor according to Example 6 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 0.41 g MgO, 11.2 g Ga2O3 and 0.40 g Cr2O3 (the target composition is LiMg). 0,5 Ga6O 10 :Cr 0,26 ).

[0114] In the oxide phosphor according to example 6, in formula (1) the variable s 0 (s = 0), the variable t 0 (t = 0), the variable u 0.5 (u = 0.5), the variable v 0 (v = 0), the variable w 6 (w = 6), the variable x 10 (x = 10), the variable y 0.26 (y = 0.26) and the variable z 0 (z = 0). Example 7

[0115] An oxide phosphor according to Example 7 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 0.62 g MgO, 12.1 g Ga2O3 and 0.31 g Cr2O3 (the target composition is LiMg). 0,75 Ga 6,5 O 11 :Cr 0,20 ).

[0116] In the oxide phosphor according to example 7, in formula (1) the variable s 0 (s = 0), the variable t 0 (t = 0), the variable u 0.75 (u = 0.75), the variable v 0 (v = 0), the variable w 6.5 (w = 6.5), the variable x 11 (x = 11), the variable y 0.20 (y = 0.20) and the variable z 0 (z = 0). Example 8

[0117] An oxide phosphor according to Example 8 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 0.62 g MgO, 12.1 g Ga2O3 and 0.40 g Cr2O3 (the target composition is LiMg). 0,75 Ga 6,5 O 11 :Cr 0,26 ).

[0118] In the oxide phosphor according to example 8, in formula (1) the variable s 0 (s = 0), the variable t 0 (t = 0), the variable u 0.75 (u = 0.75), the variable v 0 (v = 0), the variable w 6.5 (w = 6.5), the variable x 11 (x = 11), the variable y 0.26 (y = 0.26) and the variable z 0 (z = 0). Example 9

[0119] An oxide phosphor according to Example 9 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 0.81 g MgO, 13.1 g Ga2O3 and 0.06 g Cr2O3 (the target composition is LiMgGa7O). 12 :Cr 0,04 ).

[0120] In the oxide phosphor according to example 9, in formula (1) the variable s 0 (s = 0), the variable t 0 (t = 0), the variable u 1 (u = 1), the variable v 0 (v = 0), the variable w 7 (w = 7), the variable x 12 (x = 12), the variable y 0.04 (y = 0.04) and the variable z 0 (z = 0). Example 10

[0121] An oxide phosphor according to Example 10 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 0.81 g MgO, 13.1 g Ga2O3 and 0.20 g Cr2O3 (the target composition is LiMgGa7O). 12 :Cr 0,13 ).

[0122] In the oxide phosphor according to Example 10, in formula (1) the variable s 0 (s = 0), the variable t 0 (t = 0), the variable u 1 (u = 1), the variable v 0 (v = 0), the variable w 7 (w = 7), the variable x 12 (x = 12), the variable y 0.13 (y = 0.13) and the variable z 0 (z = 0). Example 11

[0123] An oxide phosphor according to Example 11 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 0.81 g MgO, 13.1 g Ga2O3 and 0.31 g Cr2O3 (the target composition is LiMgGa7O). 12 :Cr 0,20 ).

[0124] In the oxide phosphor according to Example 11, in formula (1) the variable s 0 (s = 0), the variable t 0 (t = 0), the variable u 1 (u = 1), the variable v 0 (v = 0), the variable w 7 (w = 7), the variable x 12 (x = 12), the variable y 0.20 (y = 0.20) and the variable z 0 (z = 0). Example 12

[0125] An oxide phosphor according to Example 12 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 0.81 g MgO, 13.1 g Ga2O3 and 0.40 g Cr2O3 (the target composition is LiMgGa7O). 12 :Cr 0,26 ).

[0126] In the oxide phosphor according to Example 12, in formula (1) the variable s 0 (s = 0), the variable t 0 (t = 0), the variable u 1 (u = 1), the variable v 0 (v = 0), the variable w 7 (w = 7), the variable x 12 (x = 12), the variable y 0.26 (y = 0.26) and the variable z 0 (z = 0). Example 13

[0127] An oxide phosphor according to Example 13 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 0.81 g MgO, 13.1 g Ga2O3 and 0.51 g Cr2O3 (the target composition is LiMgGa7O). 12 :Cr 0,33 ).

[0128] In the oxide phosphor according to Example 13, in formula (1) the variable s 0 (s = 0), the variable t 0 (t = 0), the variable u 1 (u = 1), the variable v 0 (v = 0), the variable w 7 (w = 7), the variable x 12 (x = 12), the variable y 0.33 (y = 0.33) and the variable z 0 (z = 0). Example 14

[0129] An oxide phosphor according to Example 14 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 0.81 g MgO, 13.1 g Ga2O3 and 0.62 g Cr2O3 (the target composition is LiMgGa7O). 12 :Cr 0,40 ).

[0130] In the oxide phosphor according to Example 14, in formula (1) the variable s 0 (s = 0), the variable t 0 (t = 0), the variable u 1 (u = 1), the variable v 0 (v = 0), the variable w 7 (w = 7), the variable x 12 (x = 12), the variable y 0.40 (y = 0.40) and the variable z 0 (z = 0). Example 15

[0131] An oxide phosphor according to Example 15 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 0.81 g MgO, 13.1 g Ga2O3 and 0.72 g Cr2O3 (the target composition is LiMgGa7O). 12 :Cr 0,46 ).

[0132] In the oxide phosphor according to Example 15, in formula (1) the variable s 0 (s = 0), the variable t 0 (t = 0), the variable u 1 (u = 1), the variable v 0 (v = 0), the variable w 7 (w = 7), the variable x 12 (x = 12), the variable y 0.46 (y = 0.46) and the variable z 0 (z = 0). Example 16

[0133] An oxide phosphor according to Example 16 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 1.2 g MgO, 15.0 g Ga2O3 and 0.31 g Cr2O3 (the target composition is LiMg). 1,5 Ga8O 14 :Cr 0,20 ).

[0134] In the oxide phosphor according to Example 16, in formula (1) the variable s 0 (s = 0), the variable t 0 (t = 0), the variable u 1.5 (u = 1.5), the variable v 0 (v = 0), the variable w 8 (w = 8), the variable x 14 (x = 14), the variable y 0.20 (y = 0.20) and the variable z 0 (z = 0). Example 17

[0135] An oxide phosphor according to Example 17 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 1.2 g MgO, 15.0 g Ga2O3 and 0.40 g Cr2O3 (the target composition is LiMg). 1,5 Ga8O 14 :Cr 0,26 ).

[0136] In the oxide phosphor according to Example 17, in formula (1) the variable s 0 (s = 0), the variable t 0 (t = 0), the variable u 1.5 (u = 1.5), the variable v 0 (v = 0), the variable w 8 (w = 8), the variable x 14 (x = 14), the variable y 0.26 (y = 0.26) and the variable z 0 (z = 0). Example 18

[0137] An oxide phosphor according to Example 18 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 1.6 g MgO, 16.8 g Ga2O3 and 0.20 g Cr2O3 (the target composition is LiMg2Ga9O). 16 :Cr 0,13 ).

[0138] In the oxide phosphor according to Example 18, in formula (1) the variable s 0 (s = 0), the variable t 0 (t = 0), the variable u 2 (u = 2), the variable v 0 (v = 0), the variable w 9 (w = 9), the variable x 16 (x = 16), the variable y 0.13 (y = 0.13) and the variable z 0 (z = 0). Example 19

[0139] An oxide phosphor according to Example 19 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 1.6 g MgO, 16.8 g Ga2O3 and 0.40 g Cr2O3 (the target composition is LiMg2Ga9O). 16 :Cr 0,26 ).

[0140] In the oxide phosphor according to Example 19, in formula (1) the variable s 0 (s = 0), the variable t 0 (t = 0), the variable u 2 (u = 2), the variable v 0 (v = 0), the variable w 9 (w = 9), the variable x 16 (x = 16), the variable y 0.26 (y = 0.26) and the variable z 0 (z = 0). Example 20

[0141] An oxide phosphor according to Example 20 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 3.2 g MgO, 24.3 g Ga2O3 and 0.20 g Cr2O3 (the target composition is LiMg4Ga 13 O 24 :Cr 0,13 ).

[0142] In the oxide phosphor according to Example 20, in formula (1) the variable s 0 (s = 0), the variable t 0 (t = 0), the variable u 4 (u = 4), the variable v 0 (v = 0), the variable w 13 (w = 13), the variable x 24 (x = 24), the variable y 0.13 (y = 0.13) and the variable z 0 (z = 0). Example 21

[0143] An oxide phosphor according to Example 21 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 1.6 g ZnO, 13.1 g Ga2O3 and 0.20 g Cr2O3 (the target composition is LiZnGa7O). 12 :Cr 0,13 ).

[0144] In the oxide phosphor according to Example 21, the variable s ≥ 0 (s = 0) in formula (1) is the element M 2 Zn, is the variable t 1 (t = 1), is the variable u 1 (u = 1), is the variable v 0 (v = 0), is the variable w 7 (w = 7), is the variable x 12 (x = 12), is the variable y 0,13 (y = 0,13) and is the variable z 0 (z = 0). Example 22

[0145] An oxide phosphor according to Example 22 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 1.6 g ZnO, 13.1 g Ga2O3 and 0.31 g Cr2O3 (the target composition is LiZnGa7O). 12 :Cr 0,20 ).

[0146] In the oxide phosphor according to Example 22, the variable s in formula (1) is 0 (s = 0), and the element M is 2 Zn, is the variable t 1 (t = 1), is the variable u 1 (u = 1), is the variable v 0 (v = 0), is the variable w 7 (w = 7), is the variable x 12 (x = 12), is the variable y 0,20 (y = 0,20) and is the variable z 0 (z = 0). Example 23

[0147] An oxide phosphor according to Example 23 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 1.6 g ZnO, 13.1 g Ga2O3 and 0.40 g Cr2O3 (the target composition is LiZnGa7O). 12 :Cr 0,26 ).

[0148] In the oxide phosphor according to Example 23, the variable s ≥ 0 (s = 0) in formula (1) is the element M 2 Zn, is the variable t 1 (t = 1), is the variable u 1 (u = 1), is the variable v 0 (v = 0), is the variable w 7 (w = 7), is the variable x 12 (x = 12), is the variable y 0.26 (y = 0.26) and is the variable z 0 (z = 0). Example 24

[0149] An oxide phosphor according to Example 24 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 3.2 g ZnO, 16.8 g Ga2O3 and 0.20 g Cr2O3 (the target composition is LiZn2Ga9O). 16 :Cr 0,13 ).

[0150] In the oxide phosphor according to Example 24, the variable s in formula (1) is 0 (s = 0), and the element M is 2 Zn, is the variable t 1 (t = 1), is the variable u 2 (u = 2), is the variable v 0 (v = 0), is the variable w 9 (w = 9), is the variable x 16 (x = 16), is the variable y 0,13 (y = 0,13) and is the variable z 0 (z = 0). Example 25

[0151] An oxide phosphor according to Example 25 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 3.2 g ZnO, 16.8 g Ga2O3 and 0.31 g Cr2O3 (the target composition is LiZn2Ga9O). 16 :Cr 0,20 ).

[0152] In the oxide phosphor according to Example 25, the variable s in formula (1) is 0 (s = 0), and the element M is 2 Zn, is the variable t 1 (t = 1), is the variable u 2 (u = 2), is the variable v 0 (v = 0), is the variable w 9 (w = 9), is the variable x 16 (x = 16), is the variable y 0,20 (y = 0,20) and is the variable z 0 (z = 0). Example 26

[0153] An oxide phosphor according to Example 26 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 3.2 g ZnO, 16.8 g Ga2O3 and 0.40 g Cr2O3 (the target composition is LiZn2Ga9O). 16 :Cr 0,26 ).

[0154] In the oxide phosphor according to Example 26, the variable s ≥ 0 (s = 0) in formula (1) is the element M 2 Zn, is the variable t 1 (t = 1), is the variable u 2 (u = 2), is the variable v 0 (v = 0), is the variable w 9 (w = 9), is the variable x 16 (x = 16), is the variable y 0.26 (y = 0.26) and is the variable z 0 (z = 0). Example 27

[0155] An oxide phosphor according to Example 27 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 6.5 g ZnO, 24.3 g Ga2O3 and 0.20 g Cr2O3 (the target composition is LiZn4Ga 13 O 24 :Cr 0,13 ).

[0156] In the oxide phosphor according to Example 27, the variable s ≥ 0 (s = 0) in formula (1) is the element M 2 Zn, is the variable t 1 (t = 1), is the variable u 4 (u = 4), is the variable v 0 (v = 0), is the variable w 13 (w = 13), is the variable x 24 (x = 24), is the variable y 0,13 (y = 0,13) and is the variable z 0 (z = 0). Example 28

[0157] An oxide phosphor according to Example 28 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 6.5 g ZnO, 24.3 g Ga2O3 and 0.31 g Cr2O3 (the target composition is LiZn4Ga 13 O 24 :Cr 0,20 ).

[0158] In the oxide phosphor according to Example 28, the variable s ≥ 0 (s = 0) in formula (1) is the element M 2 Zn, is the variable t 1 (t = 1), is the variable u 4 (u = 4), is the variable v 0 (v = 0), is the variable w 13 (w = 13), is the variable x 24 (x = 24), is the variable y 0,20 (y = 0,20) and is the variable z 0 (z = 0). Example 29

[0159] An oxide phosphor according to Example 29 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 6.5 g ZnO, 24.3 g Ga2O3 and 0.40 g Cr2O3 (the target composition is LiZn4Ga 13 O 24 :Cr 0,26 ).

[0160] In the oxide phosphor according to Example 29, the variable s ≥ 0 (s = 0) in formula (1) is the element M 2 Zn, is the variable t 1 (t = 1), is the variable u 4 (u = 4), is the variable v 0 (v = 0), is the variable w 13 (w = 13), is the variable x 24 (x = 24), is the variable y 0.26 (y = 0.26) and is the variable z 0 (z = 0). Example 30

[0161] An oxide phosphor according to Example 30 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 0.41 g MgO, 0.80 g ZnO, 13.1 g Ga2O3 and 0.31 g Cr2O3 (the target composition is LiMg 0,3 Zn 0,5 Ga7O 12 :Cr 0,20 ).

[0162] In the oxide phosphor according to Example 30, the variable s ≥ 0 (s = 0) in formula (1) is the element M 2 Zn, is the variable t 0.5 (t = 0.5), is the variable u 1 (u = 1), is the variable v 0 (v = 0), is the variable w 7 (w = 7), is the variable x 12 (x = 12), is the variable y 0.20 (y = 0.20) and is the variable z 0 (z = 0). Example 31

[0163] An oxide phosphor according to Example 31 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 0.81 g MgO, 1.6 g ZnO, 16.8 g Ga2O3 and 0.31 g Cr2O3 (the target composition is Li(Mg) 0,5 Zn 0,5 )2Ga9O 16 :Cr 0,20 ).

[0164] In the oxide phosphor according to Example 31, the variable s ≥ 0 (s = 0) in formula (1) is the element M 2 Zn, is the variable t 0.5 (t = 0.5), is the variable u 2 (u = 2), is the variable v 0 (v = 0), is the variable w 9 (w = 9), is the variable x 16 (x = 16), is the variable y 0.20 (y = 0.20) and is the variable z 0 (z = 0). Example 32

[0165] An oxide phosphor according to Example 32 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 1.6 g MgO, 3.2 g ZnO, 24.3 g Ga2O3 and 0.31 g Cr2O3 (the target composition is Li(Mg)3). 0,5 Zn 0,5 )4Ga 13 O 24 :Cr 0,20 ).

[0166] In the oxide phosphor according to Example 32, the variable s ≥ 0 (s = 0) in formula (1) is the element M 2 Zn, is the variable t 0.5 (t = 0.5), is the variable u 4 (u = 4), is the variable v 0 (v = 0), is the variable w 13 (w = 13), is the variable x 24 (x = 24), is the variable y 0.20 (y = 0.20) and is the variable z 0 (z = 0). Example 33

[0167] An oxide phosphor according to Example 33 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 0.81 g MgO, 13.1 g Ga2O3, 0.65 g Cr2O3 and 0.07 g NiO (the target composition is LiMgGa7O). 12 :Cr 0,42 , Ni 0,05 ).

[0168] In the oxide phosphor according to Example 33, in formula (1) the variable s 0 (s = 0), the variable t 0 (t = 0), the variable u 1 (u = 1), the variable v 0 (v = 0), the variable w 7 (w = 7), the variable x 12 (x = 12), the variable y 0.42 (y = 0.42), is the element M 4 Ni and is the variable z 0.05 (z = 0.05). Example 34

[0169] An oxide phosphor according to Example 34 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 0.08 g MgO, 9.7 g Ga2O3 and 0.31 g Cr2O3 (the target composition is LiMg). 0,1 Ga 5,2 O 8,4 :Cr 0,20 ).

[0170] In the oxide phosphor according to Example 34, in formula (1) the variable s 0 (s = 0), the variable t 0 (t = 0), the variable u 0.1 (u = 0.1), the variable v 0 (v = 0), the variable w 5.2 (w = 5.2), the variable x 8.4 (x = 8.4), the variable y 0.20 (y = 0.20) and the variable z 0 (z = 0). Example 35

[0171] An oxide phosphor according to Example 35 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 0.08 g MgO, 9.7 g Ga2O3 and 0.40 g Cr2O3 (the target composition is LiMg). 0,1 Gs 5,2 O 8,4 :Cr 0,26 ).

[0172] In the oxide phosphor according to Example 35, in formula (1) the variable s 0 (s = 0), the variable t 0 (t = 0), the variable u 0.1 (u = 0.1), the variable v 0 (v = 0), the variable w 5.2 (w = 5.2), the variable x 8.4 (x = 8.4), the variable y 0.26 (y = 0.26) and the variable z 0 (z = 0). Example 36

[0173] An oxide phosphor according to Example 36 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 0.04 g MgO, 9.5 g Ga2O3 and 0.31 g Cr2O3 (the target composition is LiMg). 0,05 Ga 5,1 O 8,2 :Cr 0,20 ).

[0174] In the oxide phosphor according to Example 36, in formula (1) the variable s is 0 (s = 0), the variable t is 0 (t = 0), the variable u is 0.05 (u = 0.05), the variable v is 0 (v = 0), the variable w is 5.1 (w = 5.1), the variable x is 8.2 (x = 8.2), the variable y is 0.20 (y = 0.20) and the variable z is 0 (z = 0). Example 37

[0175] An oxide phosphor according to Example 37 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 0.04 g MgO, 9.5 g Ga2O3 and 0.40 g Cr2O3 (the target composition is LiMg). 0,05 Ga 5,1 O 8,2 :Cr 0,26 ).

[0176] In the oxide phosphor according to Example 37, in formula (1) the variable s 0 (s = 0), the variable t 0 (t = 0), the variable u 0.05 (u = 0.05), the variable v 0 (v = 0), the variable w 5.1 (w = 5.1), the variable x 8.2 (x = 8.2), the variable y 0.26 (y = 0.26) and the variable z 0 (z = 0). Comparative example 1

[0177] An oxide phosphor according to Comparative Example 1 with molar proportions equal to those of the target composition is obtained in the same manner as in Example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 0.74 g Li2CO3, 9.4 g Ga2O3 and 0.26 g Cr2O3 (the target composition is LiGa5O8:Cr). 0,17 ).

[0178] The oxide phosphor according to comparative example 1 does not have the composition shown by formula (1) and does not contain Mg or the element M in its composition. 2 .

[0179] In the oxide phosphor according to comparative example 1, which has the composition represented by formula (1a), in formula (1a) there is a variable at 0 (at = 0), there is a variable au 1 (au = 1), there is a variable av 0 (av = 0), there is a variable aw 8 (aw = 8), there is a variable ax 0,17 (ax = 0,17) and there is a variable ay 0 (ay = 0). Comparative example 2

[0180] An oxide phosphor according to comparative example 2 with molar proportions equal to those of the target composition is obtained in the same manner as in example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 2.0 g MgO, 9.4 g Ga2O3 and 0.68 g Cr2O3 (the target composition is MgGa2O4:Cr). 0,18 ).

[0181] The oxide phosphor according to comparative example 2 does not have the composition shown by formula (1) and does not contain Li in its composition.

[0182] In the oxide phosphor according to comparative example 2, which has the composition represented by formula (1b), in formula (1b) bt 0 (bt = 0), bu 1 (bu = 1), bv 0 (bv = 0), bw 4 (bw = 4), bx 0.18 (bx = 0.18) and by 0 (by = 0). Comparative example 3

[0183] An oxide phosphor according to comparative example 3 with molar proportions equal to those of the target composition is obtained in the same manner as in example 1, except that a starting material mixture is prepared by weighing out starting materials to obtain 4.9 g ZnO, 11.2 g Ga2O3 and 0.18 g Cr2O3 (the target composition is ZnGa2O4:Cr). 0,04 ).

[0184] The oxide phosphor according to comparative example 3 does not have the composition shown by formula (1) and does not contain Li in its composition.

[0185] In the oxide phosphor according to comparative example 3, which has the composition represented by formula (1b), the element M is in formula (1b). b1 Zn, is bt 1 (bt = 1), is bu 1 (bu = 1), is bv 0 (bv = 0), is bw 4 (bw = 4), is bx 0.04 (bx = 0.04) and is by 0 (by = 0). Measurement of emission spectrum, light emission peak wavelength, full width at half maximum (FWHM) and relative emission intensity

[0186] The emission spectrum of each of the oxide phosphors from the examples and comparison examples was measured using a quantum efficiency measurement system (QE-2000, available from Otsuka Electronics Co., Ltd.). The peak emission wavelength of the excitation light of the light-emitting element, which is a semiconductor element used in the quantum efficiency measurement system, is 450 nm. From the resulting emission spectrum of each phosphor, the relative emission intensity, peak emission wavelength, and full width at half maximum (FWHM) were determined. That is, the peak emission wavelength (nm) in the emission spectrum of each phosphor and the FWHM (nm) of the emission spectrum at the peak emission wavelength were determined.For the oxide phosphors according to Examples 1 to 37 and the oxide phosphors according to Comparative Examples 2 and 3, the relative emission intensity (%) was determined by setting the emission intensity at the light emission peak wavelength of the oxide phosphor according to Comparative Example 1 to 100%. The results are shown in the table. Furthermore, the emission spectra of the oxide phosphors in the examples and comparative examples are illustrated in the corresponding drawings. Table 1 composition Light emission peak wavelength (nm) Half-width (nm) Relative emission intensity (%) Example 1 LiMg 0,2 Ga 5,4 O 8,8 : Cr 0,20 825 210 134 Example 2 LiMg 0,2 Ga 0,4 O 8,S: Cr 0,26 830 200 136 Example 3 LiMg 0,35 Ga 5,7 O 9,4: Cr 0,20 827 220 153 Example 4 LiMg 0,35 Ga 5,7 O 9,4: Cr 0,26 833 205 156 Example 5 LiMg 0,5 Ga6O 10 :Cr 0,20 825 205 156 Example 6 LiMg 0,5 Ga6O 10 :Cr 0,26 826 210 159 Example 7 LiMg 0,75 Ga 6,5 O 11 : Cr 0,20 828 220 149 Example 8 LiMg 0,75 Ga 6,5 O 11 : Cr 0,26 835 210 156 Example 9 LiMgGa7O 12 :Cr 0,04 720 35 131 Example 10 LiMgGa7O 12 :Cr 0,13 720 195 149 Example 11 LiMgGa7O 12 :Cr 0,20 826 210 135 Example 12 LiMgGa7O 12 :Cr 0,26 838 215 154 Example 13 LiMgGa7O 12 :Cr 0,33 859 210 149 Example 14 LiMgGa7O 12 :Cr 0,40 843 210 121 Example 15 LiMgGa7O 12 :Cr 0,46 883 195 80 Example 16 LiMg 1,5 Ga8O 14 :Cr 0,20 826 245 152 Example 17 LiMg 1,5 Ga8O 14 :Cr 0,26 845 225 141 Example 18 LiMg2Ga9O 16 :Cr 0,13 724 195 139 Example 19 LiMg2Ga9O 16 :Cr 0,26 846 210 133 Example 20 LiMg4Ga 13 O 24 :Cr 0,13 724 185 136 Example 21 LiZnGa7O 12 :Cr 0,13 834 225 131 Example 22 LiZnGa7O 12 :Cr 0,20 841 245 128 Example 23 LiZnGa7O 12 :Cr 0,26 844 210 125 Example 24 LiZn2Ga9O 16 :Cr 0,13 756 225 125 Example 25 LiZn2Ga9O 16 :Cr 0,20 838 250 112 Example 26 LiZn2Ga9O 16 :Cr 0,26 851 210 105 Example 27 LiZn4Ga 13 O 24 :Cr 0,13 707 195 102 Example 28 LiZn4Ga 13 O 24 :Cr 0,20 825 260 106 Example 29 LiZn4Ga 13 O 24 :Cr 0,26 854 215 98 Example 30 Li(Mg 0,5 Zn 0,5 )Ga7O 12 :Cr 0,20 835 240 117 Example 31 Li(Mg 0,5 Zn 0,5 )2Ga9O 16 :Cr 0,20 849 240 112 Example 32 Li(Mg 0,5 Zr 0,5 )4Ga 13 About 24 :Cr 0,20 847 260 105 Example 33 LiMgGa7O 12 :Cr 0,42 ,Ni 0,05 1248 185 87 Example 34 LiMg 0,1 Ga 5,2 O 8,4 : Cr 0,20 837 200 135 Example 35 LiMg 0,1 Ga 5,2 O 8,4 : Cr 0,26 830 200 143 Example 36 LiMg 0,05 Ga 5,1 O 8,2 : Cr 0,20 828 200 122 Example 37 LiMg 0,05 Ga 5,1 O 8,2 : Cr 0,26 831 195 116 Comparative example 1 LiGa5O8:Cr 0,17 720 130 100 Comparative example 2 MgGa2O4:Cr 0,18 884 185 109 Comparative example 3 ZnGa2O4:Cr 0,04 715 80 71

[0187] The oxide phosphors according to examples 1 to 37 have the composition shown by formula (1) and can emit light with a light emission peak wavelength in a wavelength range from red to near infrared of 700 nm to 1500 nm in the emission spectrum when irradiated with excitation light.

[0188] As in the emission spectrum of each of the oxide phosphors in the Fig. As illustrated in Figures 5 to 21, the oxide phosphors according to Examples 1 to 37 emit light when irradiated with excitation light with a light emission peak wavelength in a wavelength range from red to near infrared of 700 nm to 1500 nm.

[0189] The oxide phosphors according to examples 1 to 8 and 10 to 37 emit light when irradiated with excitation light with an emission spectrum having a light emission peak wavelength and a half-width in a range of 150 nm to 280 nm.

[0190] It is preferred that light with a wide half-width be incident to obtain in vivo information, such as small changes in the propagation behavior of light in the blood within a living organism, as well as internal information about agricultural products and fruits and vegetables. The oxide phosphors according to Examples 1 to 8 and 10 to 37 can emit light with excellent color rendering properties if the half-width is wide. In Example 9, in the composition represented by formula (1), the molar fraction of Cr as an activating element is 0.04, and since the molar fraction of Cr is small, the half-width is less than 150 nm.

[0191] The oxide phosphor according to comparative example 1 has the composition shown by formula (1a), and the oxide phosphors according to comparative examples 2 and 3 have the composition shown by formula (1b).

[0192] The oxide phosphors according to examples 1 to 14, 16 to 20 and 34 to 37 emit light with a higher emission intensity when irradiated with excitation light compared to the emission intensity obtained by dividing the sum of the emission intensity of the oxide phosphor according to comparative example 1 and the emission intensity of the oxide phosphor according to comparative example 2 by 2.

[0193] The oxide phosphors according to Examples 21 to 29 and 30 to 33 emit light with a higher emission intensity when irradiated with excitation light compared to the emission intensity obtained by dividing the sum of the emission intensity of the oxide phosphor according to Comparative Example 1 and the emission intensity of the oxide phosphor according to Comparative Example 3 by 2.

[0194] The oxide phosphors according to Examples 34 to 37 in the composition represented by formula (1) emit light with a higher emission intensity when irradiated with excitation light than the oxide phosphor according to Comparative Example 1 with the composition represented by formula (1a) and the oxide phosphors according to Comparative Examples 2 and 3 with the composition represented by formula (1b) even in a case in which 0.05 mol to 0.1 mol oxide phosphor with the composition represented by formula (1b), based on 1 mol oxide phosphor with the composition represented by formula (1a), is combined.

[0195] In the oxide phosphor according to Example 15, the molar fraction of Cr as an activating element is at least 0.46 in the composition represented by formula (1), and the emission intensity is lower than that of the oxide phosphor according to Comparative Example 1 due to concentration quenching.

[0196] The oxide phosphor according to Example 29 in the composition represented by formula (1) has Mg replaced by Zn, which is represented as the element M 2 This serves as a base and is combined with 4 mol of oxide phosphor with the composition shown in formula (1b), based on 1 mol of oxide phosphor with the composition shown in formula (1a). It is assumed that the lattice length in the crystal structure differs on the Li side, the Mg side, and the Zn side, and that distortion occurs in the crystal structure. Upon irradiation with excitation light, the full width at half maximum (FWHM) in the emission spectrum increases to exceed 150 nm, but the emission intensity is slightly lower than that of the oxide phosphor according to Comparative Example 1.

[0197] The oxide phosphor according to Example 33 in the composition represented by formula (1) has Ni as the element M 4, which, together with Cr, serves as an activating agent, and the light emission peak wavelength can be adjusted to a long wavelength of 1248 nm. However, the emission intensity is slightly lower than that of the oxide phosphor according to comparative example 1.

[0198] The oxide phosphor according to comparative example 1 has the composition shown by formula (1a), and the oxide phosphors according to comparative examples 2 and 3 have the composition shown by formula (1b). [Point of view 1]

[0199] An oxide phosphor with a composition represented by the following formula (1): (Li 1-s M 1 s )(Mg 1-t M 2 t ) u (Ga 1-v M 3 ) w O x :Cr y ,M 4 z (1) where in formula (1) M 1at least one element, selected from the group consisting of Na, K, Rb and Cs, is; M 2 at least one element, selected from the group consisting of Ca, Sr, Ba and Zn, is; M 3 at least one element, selected from the group consisting of Al and Sc, is; M 4 at least one element selected from the group consisting of Ni, Ce, Eu, Fe, Mn, Nd, Tm, Ho, Er and Yb; s, t, u, v, w and x 0 ≤ s ≤ 0.5, 0 ≤ t ≤ 1.0, 0.03 ≤ u ≤ 10, 0 ≤ v ≤ 1.0, 5.1 ≤ w ≤ 25, 0.005 ≤ u / w ≤ 0.4 and 8.2 ≤ x ≤ 48; and if Li is taken as 1 or a sum of Li and M 1 taken as 1, y and z 0.02 ≤ y ≤ 0.5, 0 ≤ z ≤ 0.3 and y > z, relative to Li or to the sum of Li and M 1 , fulfill. [Point of view 2]

[0200] The oxide phosphor according to point 1, wherein in formula (1), if Li is taken as 1 or the sum of Li and M 1taken as 1, y 0.03 ≤ y ≤ 0.48, based on Li or the sum of Li and M. 1 , fulfilled. [Point of view 3]

[0201] The oxide phosphor according to point 1 or 2, wherein in formula (1), if Li is taken as 1 or the sum of Li and M 1 taken as 1, y 0.1 ≤ y ≤ 0.46, based on Li or the sum of Li and M. 1 , fulfilled. [Point of view 4]

[0202] The oxide phosphor according to one of the points 1 to 3, wherein in formula (1) t and ut = 0 and 0.03 ≤ u ≤ 5. [Point of view 5]

[0203] The oxide phosphor according to one of the points 1 to 3, wherein in formula (1) t, u and wt = 0, 0.05 ≤ u ≤ 4 and 5.4 ≤ w ≤ 13. [Point of view 6]

[0204] The oxide phosphor according to one of the points 1 to 3, wherein in formula (1) s, t, u and ws = 0, t = 0, 0.2 ≤ u ≤ 4 and 5.4 ≤ w ≤ 13. [Point of view 7]

[0205] The oxide phosphor according to one of the points 1 to 3, wherein in formula (1) M 2 at least one element, selected from the group consisting of Ca, Sr and Ba, is and t 0.01 ≤ t ≤ 0.3 is satisfied. [Point of view 8]

[0206] The oxide phosphor according to one of the points 1 to 7, wherein The oxide phosphor emits light with a light emission peak wavelength in a range of 700 nm to 1500 nm in an emission spectrum when irradiated with excitation light. [Point of view 9]

[0207] The oxide phosphor according to one of the points 1 to 8, wherein The oxide phosphor emits light with a half-width in a range of 150 nm to 280 nm in an emission spectrum when irradiated with excitation light. [Point of view 10]

[0208] The oxide phosphor according to point 1, wherein in formula (1) M 4 equal to Ni and if Li is taken as 1, z 0.001 ≤ z ≤ 0.2 is satisfied. [Point of view 11]

[0209] The oxide phosphor according to one of the aspects 1 to 3 and the aspects 8 and 9 which depend on one of the aspects 1 to 3, wherein in formula (1) t and u 0.4 ≤ t ≤ 0.6 and 0.2 ≤ u ≤ 5. [Point of view 12]

[0210] The oxide phosphor according to point 11, wherein The oxide phosphor emits light with a light emission peak wavelength in a range of 820 nm to 860 nm in an emission spectrum when irradiated with excitation light. [Point of view 13]

[0211] The oxide phosphor according to point 11, wherein The oxide phosphor emits light with a half-width in a range of 200 nm to 280 nm in an emission spectrum when irradiated with excitation light. [Point of view 14]

[0212] The oxide phosphor according to one of the aspects 1 to 3 and the aspects 8 and 9 which depend on one of the aspects 1 to 3, wherein in formula (1) M 2 Zn contains and tt = 1.0 is satisfied. [Point of view 15]

[0213] The oxide phosphor according to one of the aspects 1 to 3 and the aspect 9 which depends on one of the aspects 1 to 3, wherein M 2 is equal to Zn and t in formula (1) t = 1.0 is satisfied, and the oxide phosphor has a light emission peak wavelength in a range of 700 nm to 860 nm in an emission spectrum. [Point of view 16]

[0214] A light-emitting device comprising: the oxide phosphor according to one of the points 1 to 15; and a light-emitting element configured to emit light with a light emission peak wavelength in a range of 365 nm to 650 nm.

[0215] The oxide phosphor according to the present disclosure can also be used in a medical light-emitting device for obtaining in vivo information, a light-emitting device mounted on a small mobile device, such as a smartphone or smartwatch, for the treatment of a health condition, a light-emitting device used in a medical device, a light-emitting device for an analyzer for the non-destructive measurement of internal information of pharmaceutical products or food and agricultural products, such as fruits, vegetables and rice, a light-emitting device for plant cultivation which influences the photoreceptors of plants, and a light-emitting device of a reflection spectroscopic measuring instrument used for measuring film thickness or the like. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 2024-148286

[0001] JP 2020-528486

[0005] JP 2010-062272 A

[0074] JP 2014-112635 A

[0079] JP 2017-117912 A

[0079]

Claims

[1] An oxide phosphor with a composition represented by the following formula (1): (Li 1-s M 1 s )(Mg 1-t M 2 t ) u (Ga 1-v M 3 v ) w O x :Cr y ,M 4 z (1) where in formula (1) M 1 at least one element selected from the group consisting of Na, K, Rb and Cs; M 2 at least one element selected from the group consisting of Ca, Sr, Ba and Zn is; M 3 at least one element, selected from the group consisting of Al and Sc, is; M 4 at least one element selected from the group consisting of Ni, Ce, Eu, Fe, Mn, Nd, Tm, Ho, Er and Yb; s, t, u, v, w and x 0 ≤ s ≤ 0.5, 0 ≤ t ≤ 1.0, 0.03 ≤ u ≤ 10, 0 ≤ v ≤ 1.0, 5.1 ≤ w ≤ 25, 0.005 ≤ u / w ≤ 0.4 and 8.2 ≤ x ≤ 48; and if Li is taken as 1 or a sum of Li and M 1taken as 1, y and z 0.02 ≤ y ≤ 0.5, 0 ≤ z ≤ 0.3 and y > z, relative to Li or to the sum of Li and M 1 , fulfill. [2] The oxide phosphor according to claim 1, wherein in formula (1) where Li is taken as 1 or the sum of Li and M 1 As 1 is taken, y 0.03 ≤ y ≤ 0.48, based on Li or the sum of Li and M. 1 , fulfilled. [3] The oxide phosphor according to claim 1 or 2, wherein in formula (1) where Li is taken as 1 or the sum of Li and M 1 taken as 1, y 0.1 ≤ y ≤ 0.46, based on Li or on the sum of Li and M 1 , fulfilled. [4] The oxide phosphor according to any one of claims 1 to 3, wherein in formula (1) t and ut = 0 and 0.03 ≤ u ≤ 5 are satisfied. [5] The oxide phosphor according to any one of claims 1 to 3, wherein in formula (1) t, u and wt = 0, 0.05 ≤ u ≤ 4 and 5.4 ≤ w ≤ 13 satisfy. [6] The oxide phosphor according to any one of claims 1 to 3, wherein in formula (1) s, t, u and ws = 0, t = 0, 0.2 ≤ u ≤ 4 and 5.4 ≤ w ≤ 13 satisfy. [7] The oxide phosphor according to any one of claims 1 to 3, wherein in formula (1) M 2 at least one element selected from the group consisting of Ca, Sr and Ba, is and t 0.01 ≤ t ≤ 0.3 is satisfied. [8] The oxide phosphor according to any one of claims 1 to 7, wherein the oxide phosphor emits light with a light emission peak wavelength in a range of 700 nm to 1500 nm in an emission spectrum when irradiated with excitation light. [9] The oxide phosphor according to any one of claims 1 to 8, wherein the oxide phosphor emits light with a half-width in a range of 150 nm to 280 nm in an emission spectrum when irradiated with excitation light. [10] The oxide phosphor according to claim 1, wherein in formula (1) M 4equal to Ni and if Li is taken as 1, z 0.001 ≤ z ≤ 0.2 is satisfied. [11] The oxide phosphor according to any one of claims 1 to 3 and claims 8 and 9 which depend on any one of claims 1 to 3, wherein in formula (1) t and u satisfy 0.4 ≤ t ≤ 0.6 and 0.2 ≤ u ≤ 5. [12] The oxide phosphor according to claim 11, wherein the oxide phosphor emits light with a light emission peak wavelength in a range of 820 nm to 860 nm in an emission spectrum when irradiated with excitation light. [13] The oxide phosphor according to claim 11, wherein the oxide phosphor emits light with a half-width in a range of 200 nm to 280 nm in an emission spectrum when irradiated with excitation light. [14] The oxide phosphor according to any one of claims 1 to 3 and claims 8 and 9 dependent on any one of claims 1 to 3, wherein in formula (1) M 2 Zn contains and tt = 1.0 is satisfied. [15] The oxide phosphor according to any one of claims 1 to 3 and claim 9, which is dependent on any one of claims 1 to 3, wherein M 2 is equal to Zn and t in formula (1) t = 1.0 is satisfied, and the oxide phosphor has a light emission peak wavelength in a range of 700 nm to 860 nm in an emission spectrum. [16] A light-emitting device comprising: the oxide phosphor according to any one of claims 1 to 15; and a light-emitting element configured to emit light with a light emission peak wavelength in a range of 365 nm to 650 nm.

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