TW201404865A - Phosphor, illuminating device and illuminating device - Google Patents

Abstract

The purpose of this invention is to provide a phosphor which is yellow light but also has a lot of red elements or green elements at the same time, and to provide a light emitting device and an illuminating device both having high color rendering properties by using the phosphor. This invention is a phosphor represented by a normal formula LuAlON: Ce, wherein N content is 0.010mass% or more to 5.0mass% or less, the molar ratio between Ce and Lu is Ce/Lu ≥ 0.05, and the molar ratio between Al and the total of O and N is Al/(O + N) > 5/13. The other invention is a light emitting device having the phosphor and a light emitting element. The other invention is an illuminating device having the light emitting device.

Description

Phosphor, illuminating device and illuminating device

The invention of the present invention relates to a phosphor, a light-emitting device and a lighting device.

Patent Document 1 discloses a light-emitting device which converts blue light (blue light-emitting diode or laser diode) and converts the blue light (wavelength: 420 nm to 470 nm) into a phosphor. The yellow light is coming to emit white light. Here, the fluorescent system is obtained by substituting a part of Y of YAG (yttrium aluminum garnet) with Lu, Sc, Gd, and La.

Patent Document 2 shows YAG as a phosphor that converts blue light into yellow light.

However, in the yellow light emitted by yttrium-activated YAG, since the red component (wavelength: 600 nm to 700 nm) and the green component (wavelength: 510 nm to 550 nm) are small, when combined with the blue light-emitting diode, it may not be obtained. The subject of high color rendering white light.

In Patent Document 3, in order to secure the red color component and the green component to improve the color rendering property, a phosphor that emits green or red light is used. However, when a different phosphor is mixed, the phosphor of one of the phosphors may be illuminated. The other phosphor absorbs and causes a problem of reduced luminous efficiency.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. Hei 10-190066

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2003-8082

[Patent Document 3] International Publication No. 06/093298

An object of the present invention is to provide a phosphor which is yellow light and has a large number of red components and green components, and a light-emitting device and an illumination device which have high color rendering properties using the phosphor.

As a result of a review conducted by the inventors of the present invention, it has been found that a phosphor having a luminescent color of yellow light and a plurality of red and green components can be obtained by a composition of a phosphor represented by the general formula LuAlON:Ce; By using this phosphor, a light-emitting device and a lighting device having high color rendering properties can be obtained, and thus the present invention has been completed.

The present invention is represented by the general formula LuAlON:Ce, N is 0.010% by mass or more and 5.0% by mass or less, the molar ratio of Ce to Lu is Ce/Lu≧0.05, and the molar ratio of Al to O and N is Al/ (O+N)>5/13 phosphor.

Other inventions are light-emitting devices having the above-described phosphor and light-emitting elements, and still other inventions are illumination devices using the light-emitting devices.

The phosphor of the present invention is efficiently excited by light of a wavelength range of 350 nm or more and 500 nm or less emitted by a blue light-emitting element, and the luminescent color is yellow, while the chromaticity X, the peak wavelength, and the half value are The value of the web is large and contains more red and green components. Therefore, by combining with the blue light-emitting element, a light-emitting device and an illumination device that realize high color rendering white can be obtained.

1‧‧‧Blue LED chip

2‧‧‧Fertior

3‧‧‧ lead

4‧‧‧Packaging resin

5‧‧‧ Container

6‧‧‧Electrical terminals

7‧‧‧Other conductive terminals

Fig. 1 is an explanatory view showing a light-emitting device of a seventh embodiment of the present invention in a schematic manner.

[Formation of the Invention]

Hereinafter, embodiments of the present invention will be described.

The fluorescent system of the present invention is represented by the general formula LuAlON:Ce, and contains a fluorescent element having a predetermined amount of nitrogen element and containing a large amount of cerium oxynitride. In terms of composition ratio, the system N is 0.010% by mass or more and 5.0% by mass or less, the molar ratio of Ce to Lu is Ce/Lu ≧ 0.05, and the molar ratio of Al to O and N is Al/(O+ N)>5/13 phosphor.

In the above formula, Lu is 镏, and part or all of 镏 may be replaced by one or more elements of the group consisting of Y, Sc, La, Gd, and Sm.

Ce is 铈, and some or all of 铈 may be replaced by one or more elements of the group consisting of Pr, Nd, Eu, Tb, Dy, Ho, Er, Tm, Yb, and Mn.

Al is aluminum, and some or all of aluminum may be any of Ga and In or Replace the two. O is oxygen and N is nitrogen.

By setting N to 0.010% by mass or more and 5.0% by mass or less, the molar ratio of Ce to Lu is Ce/Lu ≧ 0.05, and the molar ratio of Al to O and N is Al/(O+N)>5. In the phosphor of /13, the chromaticity X is remarkably increased, the peak wavelength is increased, the half value is increased, and the proportion of the fluorescent component of red (wavelength of 600 nm or more and 700 nm or less) is increased, and the wavelength is prolonged. This is mainly because when the molar ratio of Ce/Lu is increased and the nitrogen content is increased, the proportion of the red component (wavelength of 600 nm or more and 700 nm or less) of the luminescent color of the phosphor increases. Moreover, since the half value width becomes large, the ratio of the green component (wavelength 510 nm or more and 550 nm or less) in the luminescent color also increases. In this way, a phosphor containing a large amount of yellow light of a red component and a green component can be obtained.

The nitrogen atom in the phosphor of the present invention is present in the crystal lattice of the phosphor itself and/or between the crystal lattices. The nitrogen content in the obtained phosphor can be measured by an oxygen-nitrogen measuring machine (for example, EMGA-920 manufactured by Horiba, Ltd.). For the measurement method, oxygen can be used as an inert gas melting-non-dispersive infrared absorption method (NDIR), and nitrogen can be used as an inert gas melting-thermal conductivity method (TCD). As described above, the increase in the nitrogen content is related to an increase in the red component in the luminescent color of the phosphor, and if the nitrogen content is too large, the luminescent intensity tends to decrease.

In the phosphor of the present invention, the wavelength of the luminescence peak shifts to the long wavelength side as compared with the conventional phosphor of Patent Document 2, and in addition to the red component, the green component is also large, so that the yellow color is thicker. . Since the peak wavelength of the excitation spectrum is in the range of 350 to 500 nm, light in this wavelength range can be excited with good efficiency and emit yellow light, so Suitable for white LEDs with high color rendering.

The method for producing a phosphor of the present invention preferably comprises the following two steps: a mixing step of mixing a plurality of raw materials composed of a compound containing Lu, Al, O and Ce; and a calcining step of the raw materials after the mixing step The mixed powder is maintained at a metering pressure of 0.001 MPa or more and 100 MPa or less in a nitrogen gas atmosphere, and a temperature range of 1000 ° C or more and 2400 ° C or less.

As a raw material of the mixing step, it is preferred to use an oxide having a purity of 99% or more, a carbonate, a nitrate, a halide, an oxalate or the like which is pyrolyzed to form an oxide; an oxide having a purity of 99.9% or more; And a nitride having a purity of 99.9% or more. The nitride is AlN or azide, and preferably has a purity of 99.9% or more.

When mixing the starting materials, a ball mill, a V-type mixer, a stirring device, or the like can be used.

The firing step is preferably carried out in a temperature range of, for example, 1000 ° C to 2400 ° C and a pressure range of 0.001 MPa to 100 MPa, and is maintained for 1 hour or longer and 100 hours or shorter. The firing temperature is more preferably 1,500 ° C or more and 2200 ° C or less. The gas ambient pressure in the firing step is preferably 0.7 MPa or more and 70 MPa or less.

As a gas atmosphere for firing, a gas atmosphere containing a nitrogen element is used. The gas atmosphere containing a nitrogen element is specifically a gas atmosphere containing nitrogen and/or ammonia, and may contain an inert gas such as argon gas or helium gas. The content of nitrogen and/or ammonia is preferably 10% by volume or more, more preferably 50% by volume or more, still more preferably 100% by volume, and most preferably a nitrogen-containing gas atmosphere is composed of high-purity nitrogen (purity of 99.99% or more). And/or high purity ammonia (pure) The situation is composed of 99.99% or more.

When pre-baking is performed before firing, the pre-calcined gas atmosphere may be any of an inert gas atmosphere, an oxidizing gas atmosphere, a reducing gas atmosphere, and a nitrogen-containing gas atmosphere. As the inert gas of the inert gas atmosphere, there are nitrogen gas and argon gas. As the gas of the oxidizing gas atmosphere, there are air, oxygen, oxygen-containing nitrogen, and oxygen-containing argon. As the gas of the reducing gas atmosphere, there are hydrogen-containing nitrogen gas and hydrogen-containing argon gas. In order to promote the reaction, an appropriate amount of flux may be added to the gas.

Since the firing temperature is high temperature and the firing gas atmosphere is a gaseous environment containing nitrogen, the furnace for firing is preferably a metal resistance heating method or a graphite resistance heating method, and it is preferable to use carbon as a high temperature portion of the furnace. The electric furnace of the material.

The phosphor obtained by the above method can also be pulverized by using a pulverizing apparatus generally used in the industry such as a ball mill, a vibration mill, an attritor, or a jet mill. In order to improve the crystallinity of the obtained phosphor, it may be re-fired. Further, in order to promote crystal growth and carry out a synthesis reaction, it may be re-fired.

Further, as the post-treatment, washing, dispersion treatment, drying, classification, and the like may be performed after the above steps. Among them, it is preferred to provide a washing step using an acid. When pickling is performed, the phosphor is dispersed in a granular form in an acidic aqueous solution, and then washed with water. Specifically, there are one or more inorganic acids such as hydrochloric acid, sulfuric acid, and nitric acid, and hydrochloric acid is preferred. Unreacted materials, by-products, and fluxes can be dissolved and separately removed by pickling. Moreover, the obtained phosphor is as described later. When it is used by being dispersed in a light-transmitting resin, in order to improve moisture resistance and dispersibility, a well-known surface treatment can be performed as needed.

The phosphor of the present invention can be made into a light-emitting device by being combined with a light-emitting element. In the light-emitting device of the present invention, the phosphor of the present invention can be dispersed in a light-transmitting resin such as an epoxy resin, a polycarbonate or a ruthenium rubber, so that the resin-coated stem in which the phosphor is dispersed can be used. The light-emitting element (compound semiconductor) on the stem is molded and manufactured. In the light-emitting device of the present invention, in order to realize white light emission, a blue light-emitting nitride semiconductor is preferably used as the light-emitting element, and a compound semiconductor that emits ultraviolet light to blue light may be used.

Specifically, a light-emitting element composed of a nitride semiconductor that excites a phosphor and emits light having a wavelength of 350 nm to 500 nm is preferable. The nitride semiconductor can change the emission wavelength depending on the ratio of the constituent elements. For example, in the Ga-N system, the peak of the emission wavelength can be controlled between 320 nm and 450 nm, and in the In-Al-Ga-N system, it can be from 300 nm to 500 nm. Control the peak of the emission wavelength. As a light-emitting element composed of a nitride semiconductor, the light-emitting layer contains a compound represented by a composition formula of In _x Al _y Ga _1-xy N (0<x, 0<y, x+y<1), and has a heterogeneity. A light-emitting element of a constructed or double heterostructure.

The phosphor of the present invention can be used alone or in combination with other phosphors such as a red-emitting phosphor or a green-emitting phosphor to produce a light-emitting device having a higher whiteness.

Further, by applying the light-emitting device, it is possible to obtain an illumination device that emits white light of high color rendering.

[Example 1]

Embodiments of the invention will be described. As shown in Table 1, the fluorescent system of Example 1 is a phosphor represented by the general formula LuAlON:Ce, the nitrogen content is 0.066% by mass, the molar ratio of Ce to Lu is Ce/Lu=1.000, and Al is relative to The molar ratio of O and N is Al / (O + N) = 0.443.

<mixing step>

In the mixing step, 32.7% by mass of Lu ₂ O ₃ (manufactured by Wako Pure Chemical Industries, Ltd.), 28.3% by mass of CeO ₂ (manufactured by Wako Pure Chemical Industries, Ltd., and light grade), and 39.0% by mass were blended. Al ₂ O ₃ (TM-DAR grade manufactured by Daming Chemical Co., Ltd.), and 1 kg of a raw material mixture was obtained. The molar ratio of Lu, Ce, and Al added is Lu:Ce:Al=1.5:1.5:7.

The raw material mixture was mixed by a SUPERMIXER of KAWADA Co., Ltd., and all of them were passed through a nylon sieve having a pore size of 850 μm to obtain a raw material powder for phosphor synthesis.

<Burning step>

50 g of the raw material powder was filled in a cylindrical cylindrical boron nitride container (N-1 grade manufactured by Denki Kagaku Kogyo Co., Ltd.) having an inner size of 8 cm in diameter and 8 cm in height, and the container was placed in an internal size. It is an interior of a graphite case with an upper cover of 100 cm × 50 cm × height 13 cm. On the side of the graphite box, four holes are formed on the long side, and four holes of 20 mm in diameter are also opened on the short side. Further, a hole having a diameter of 50 mm was opened in the center of the bottom, and an exhaust pipe was provided below the hole, and the gas was exhausted from the exhaust pipe during the firing. The electric furnace of the carbon heater was subjected to heat treatment at 1,700 ° C for 15 hours in a pressurized nitrogen atmosphere of 0.7 MPa, and then the obtained powder was gradually cooled to room temperature. This fired product was pulverized in a mortar and passed through a sieve having a pore size of 250 μm to prepare a synthetic powder.

The external quantum efficiency, chromaticity X, peak wavelength, half-value width, color rendering index, and nitrogen content of the phosphor prepared in Example 1 The results are shown in Table 1.

The external quantum efficiency of Table 1 was measured by a spectrophotometer (MCPD-7000, manufactured by Otsuka Electronics Co., Ltd.). The concave sample cell is filled with a phosphor to smooth the surface of the sample cell, and an integrating sphere is mounted. Monochrome light obtained by splitting a light source (Xe lamp) into a wavelength of 455 nm is introduced into the integrating sphere using an optical fiber. The phosphor sample is irradiated with the monochromatic light as an excitation source, and the fluorescence spectrum of the sample is measured. The luminous efficiency was determined as follows. A standard reflection plate (Spectralon, manufactured by Labsphere Co., Ltd.) having a reflectance of 99% was placed in the sample portion, and the spectrum of the excitation light having a wavelength of 455 nm was measured. At this time, the number of photons (Qex) of the excitation light is calculated from the spectrum of the wavelength range of 450 nm to 465 nm. Next, a sample is placed in the sample portion, and the number of photons (Qref) of the excited reflected light and the number of photons of the fluorescent light (Qem) are calculated from the obtained spectral data. The number of photons that excite the reflected light is calculated in the same wavelength range as the number of photons of the excitation light, and the number of photons of the fluorescence is calculated in the range of 465 nm to 800 nm. The external quantum efficiency (=Qem/Qex×100), the absorptance (=(Qex-Qref)×100), and the internal quantum efficiency (=Qem/(Qex-Qref)×100) were obtained from the obtained three photon numbers.

In the examples, the acceptable external quantum efficiency was 40% or more.

The chromaticity X of Table 1 is a value of CIE 1931, which was measured by a spectrophotometer (MCPD-7000, manufactured by Otsuka Electronics Co., Ltd.). In the examples, the acceptable chromaticity X was 0.385 or more.

The peak wavelengths of Table 1 were measured by a spectrophotometer (MCPD-7000, manufactured by Otsuka Electronics Co., Ltd.). In the examples, the acceptable peak wavelength was 544.0 nm or more.

The half-valued amplitude of Table 1 is obtained by spectrophotometer Determined by MCPD-7000). In the examples, the acceptable half-value width is 103.0 nm or more.

The nitrogen content of Table 1 was measured by an oxygen-nitrogen measuring machine (EMGA-920, manufactured by HORIBA Co., Ltd.). In the examples, the acceptable nitrogen content was 0.010% by mass or more.

The color rendering index is measured by the following method. 10 g of the phosphor was added to 100 g of water together with 1.0 g of an epoxy decane coupling agent (KBE 402 manufactured by Shin-Etsu Silicone Co., Ltd.), and stirred for one night. Then, an appropriate amount of the phosphor after the filtered and dried decane coupling agent was mixed and mixed in 10 g of epoxy resin (NLD-SL-2101 manufactured by SANYU REC Co., Ltd.), and bonded to blue light having an emission wavelength of 460 nm. The color LED element was subjected to vacuum degassing, and the resin was heat-hardened at 110 ° C to obtain a surface mount type LED. A current of 10 mA was passed through the LED to measure the generated light, and the average color rendering number (Ra) was measured. In the examples, the acceptable color rendering index (Ra) was 70.0 or more.

As shown in Table 1, the external quantum efficiency, the chromaticity X, the peak wavelength, the half-value width, the nitrogen content, and the color rendering index (Ra) of Example 1 all showed excellent values.

[Embodiment 2]

In the raw material mixing step, 50.9% by mass of Lu ₂ O ₃ (manufactured by Wako Pure Chemical Industries, Ltd.), CeO ₂ (manufactured by Wako Pure Chemical Industries, Ltd., and light grade), 11.0% by mass, Al ₂ O ₃ ( Daming Chemical Co., Ltd. made TM-DAR grade) 38.1% by mass, and obtained 1 kg of raw material mixture. The molar ratio of Lu, Ce, and Al added was Lu:Ce:Al=2.4:0.6:7. The subsequent steps are the same as in the first embodiment. As shown in Table 1, it has excellent values in terms of external quantum efficiency, chromaticity X, peak wavelength, half-value width, nitrogen content, and color rendering index (Ra).

[Example 3]

In the raw material mixing step, Lu ₂ O ₃ (manufactured by Wako Pure Chemical Industries, Ltd.), 59.1% by mass, CeO ₂ (manufactured by Wako Pure Chemical Industries, Ltd., and light grade), 3.3 mass%, Al ₂ O ₃ ( Daming Chemical Co., Ltd. made TM-DAR grade) 37.6 mass%, and obtained 1 kg of raw material mixture. The molar ratio of Lu, Ce, and Al added was Lu:Ce:Al=2.82:0.18:7. The subsequent steps are the same as in the first embodiment. As shown in Table 1, it has excellent values in terms of external quantum efficiency, chromaticity X, peak wavelength, half-value width, nitrogen content, and color rendering index (Ra).

[Example 4]

In the raw material mixing step, 36.8% by mass of Lu ₂ O ₃ (manufactured by Wako Pure Chemical Industries, Ltd.), CeO ₂ (manufactured by Wako Pure Chemical Industries, Ltd., and light grade), 31.8 mass%, and Al ₂ O ₃ ( Daming Chemical Co., Ltd. made TM-DAR grade) 31.4% by mass, and obtained 1 kg of raw material mixture. The molar ratio of Lu, Ce, and Al added was Lu:Ce:Al=1.5:1.5:5. The subsequent steps are the same as in the first embodiment. As shown in Table 1, it has excellent values in terms of external quantum efficiency, chromaticity X, peak wavelength, half-value width, nitrogen content, and color rendering index (Ra).

[Example 5]

In the raw material mixing step, Lu ₂ O ₃ (manufactured by Wako Pure Chemical Industries, Ltd.), 57.1% by mass, CeO ₂ (manufactured by Wako Pure Chemical Industries, Ltd., and optical grade), 12.4% by mass, Al ₂ O ₃ ( Daming Chemical Co., Ltd. made TM-DAR grade) 30.5 mass%, and obtained 1 kg of raw material mixture. The molar ratio of Lu, Ce, and Al added was Lu:Ce:Al=2.4:0.6:5. The subsequent steps are the same as in the first embodiment. As shown in Table 1, it has excellent values in terms of external quantum efficiency, chromaticity X, peak wavelength, half-value width, nitrogen content, and color rendering index (Ra).

[Embodiment 6]

In the raw material mixing step, Lu ₂ O ₃ (manufactured by Wako Pure Chemical Industries, Ltd.) was blended with 66.2% by mass, CeO ₂ (manufactured by Wako Pure Chemical Industries, Ltd., and light grade), 3.7 mass%, and Al ₂ O ₃ ( Daming Chemical Co., Ltd. made TM-DAR grade) 30.1% by mass, and obtained 1 kg of raw material mixture. The molar ratio of Lu, Ce, and Al added was Lu:Ce:Al=2.82:0.18:5. The subsequent steps are the same as in the first embodiment. As shown in Table 1, it has excellent values in terms of external quantum efficiency, chromaticity X, peak wavelength, half-value width, nitrogen content, and color rendering index (Ra).

<Comparative Example 1>

In the raw material mixing step, Lu ₂ O ₃ (manufactured by Wako Pure Chemical Industries, Ltd.) was blended with 69.2% by mass, CeO ₂ (manufactured by Wako Pure Chemical Industries, Ltd., and light grade), 0.8% by mass, and Al ₂ O ₃ ( Daming Chemical Co., Ltd. made TM-DAR grade) 30.0 mass%, and obtained 1 kg of raw material mixture. The molar ratio of Lu, Ce, and Al added was Lu:Ce:Al=2.96:0.04:5. The subsequent steps are the same as in the first embodiment. As compared with the examples shown in Table 1, it was found that the chromaticity X was low, the peak wavelength and the half-value width became small values, and the intensity of the red component was lowered. The color rendering index (Ra) is also below 70.0. In addition, the nitrogen content is also less than in the examples.

<Comparative Example 2>

A phosphor was produced under the same conditions as in Example 1 except that the raw material mixing step was carried out in the raw material composition shown in Table 1. As compared with the examples shown in Table 1, it was found that the chromaticity X was low, the peak wavelength and the half-value width became small values, and the intensity of the red component was lowered. The color rendering index (Ra) is also below 70.0. In addition, the nitrogen content is also less than in the examples.

<Comparative Examples 5 to 7>

A phosphor was produced under the same conditions as in Example 1 except that the raw material mixing step was carried out in the raw material composition shown in Table 1. The comparative examples 5 to 7 in which the Al/(O+N) molar ratio is 5/13 or less are shown in Table 1, and the external quantum efficiency particularly shows a significantly lower value when compared with the examples. .

<Comparative Examples 3 and 4>

The raw material mixture was mixed by a SUPERMIXER of KAWADA Co., Ltd., and all of them were passed through a nylon sieve having a pore size of 850 μm to obtain a raw material powder for phosphor synthesis. In the baking step, 50 g of the raw material powder is filled in a cylindrical boron nitride container (N-1 grade manufactured by Denki Kagaku Kogyo Co., Ltd.) having a diameter of 8 cm × a height of 8 cm and the The container was placed inside a graphite box with an upper cover having an inner dimension of 100 cm x 50 cm x height 13 cm. On the side of the graphite box, four holes are formed on the long side, and four holes of 20 mm in diameter are also opened on the short side. The obtained powder was gradually cooled to room temperature by heat treatment at 1700 ° C for 15 hours in an electric furnace of a carbon heater under an absolute pressure in a vacuum atmosphere of 5.0 Pa. The subsequent steps are the same as in the first embodiment.

In Comparative Examples 3 and 4, as shown in Table 1, it was found that the chromaticity was low, the peak wavelength and the half-value width became small values, and the intensity of the red component was lowered. The nitrogen content is also significantly reduced compared to other manufacturing examples. The color rendering index (Ra) is also below 70.0.

In particular, when comparing Comparative Example 2 and Examples 1 to 3 of Table 1, it was found that by increasing cerium oxide, the nitrogen content was increased, the chromaticity X was increased, the peak wavelength and the half-value width were increased, and the red component was The strength increases.

[Embodiment 7]

The invention of the seventh embodiment is a light-emitting device having the above-described phosphor and light-emitting element 5. The configuration of the light-emitting device of Example 7 is shown in Fig. 1. The light-emitting device emits white light, and the blue LED chip 1 is connected to the conductive terminal 6 to be placed at the bottom of the container 5, and the blue LED chip 1 is connected to the other conductive terminals 7 by the leads 3, and then The phosphor 2 is configured to be heat-hardened with an epoxy resin as the encapsulating resin 4.

As a result of measuring the luminescence spectrum of the light generated by the current of 10 Ma flowing through the surface mount type LED, when the phosphors of Examples 1 to 6 were used as the phosphor, good color rendering as shown in Table 1 was exhibited. .

[Embodiment 8]

The invention of the eighth embodiment is an illumination device, and is a bulb-type illumination device having the illumination device of the seventh embodiment, although not shown. When the illuminating device used the phosphors of Examples 1 to 6 as the phosphor, good color rendering properties as shown in Table 1 were exhibited.

1‧‧‧Blue LED chip

2‧‧‧Fertior

3‧‧‧ lead

4‧‧‧Packaging resin

5‧‧‧ Container

6‧‧‧Electrical terminals

7‧‧‧Other conductive terminals

Claims (3)

A phosphor represented by the general formula LuAlON:Ce, N is 0.010% by mass or more and 5.0% by mass or less, a molar ratio of Ce to Lu is Ce/Lu≧0.05, and Al is relative to O and N. The ratio is Al/(O+N)>5/13. A light-emitting device having a phosphor as in the first aspect of the patent application. A lighting device having a light-emitting device according to item 2 of the patent application.