WO2012124302A1 - 発光装置用蛍光体とその製造方法、及びそれを用いた発光装置 - Google Patents
発光装置用蛍光体とその製造方法、及びそれを用いた発光装置 Download PDFInfo
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- WO2012124302A1 WO2012124302A1 PCT/JP2012/001653 JP2012001653W WO2012124302A1 WO 2012124302 A1 WO2012124302 A1 WO 2012124302A1 JP 2012001653 W JP2012001653 W JP 2012001653W WO 2012124302 A1 WO2012124302 A1 WO 2012124302A1
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- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/4805—Shape
- H01L2224/4809—Loop shape
- H01L2224/48091—Arched
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L2224/85—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a wire connector
- H01L2224/85909—Post-treatment of the connector or wire bonding area
- H01L2224/8592—Applying permanent coating, e.g. protective coating
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
- H01L2924/181—Encapsulation
Definitions
- Embodiments of the present invention relate to a phosphor for a light emitting device, a manufacturing method thereof, and a light emitting device using the same.
- LEDs Light emitting devices using light emitting diodes
- lighting devices such as backlights for liquid crystal display devices, signal devices, switches, in-vehicle lamps, and general lighting.
- white light emitting LED lamps white LED lamps
- LEDs and phosphors are used in lighting fixtures that use incandescent bulbs, fluorescent lamps, etc., in addition to backlights for liquid crystal display devices and in-vehicle lamps. It attracts attention as an alternative and is being put to practical use as a white lighting fixture.
- an LED lamp combining a blue light emitting LED chip and a yellow phosphor, an LED lamp combining a blue light emitting LED chip, a green to yellow phosphor and a red phosphor, and an emission wavelength of 360 to 440 nm.
- an LED lamp or the like in which an LED chip emitting about ultraviolet to purple light and a mixture of blue, green to yellow, and red phosphors (BGR or BYR phosphor) are combined.
- Known green to yellow phosphors used in white LED lamps include europium (Eu) and manganese (Mn) activated alkaline earth silicate phosphors such as (Sr, Ba, Mg) 2 SiO 4 : Eu, Mn. It has been.
- White LED lamps that combine blue LED chips, green to yellow phosphors, and red phosphors have higher luminous efficiency and color rendering than white LED lamps that combine blue LED chips and yellow phosphors. Although it is excellent, it has a drawback of poor weather resistance. In particular, in a high temperature and high humidity environment, the brightness of the white LED lamp is significantly deteriorated. This is considered to be derived from Eu and Mn activated alkaline earth silicate phosphors used as green to yellow phosphors. Even in a white LED lamp in which an ultraviolet to purple LED chip and a BGR or BYR phosphor are combined, when Eu and Mn activated alkaline earth silicate phosphors are used as green to yellow phosphors, weather resistance This is a problem.
- Red phosphor La 2 O 2 is used as the S: Eu, europium Sm, etc. (Eu) and samarium (Sm) activated lanthanum oxysulfide phosphor is used as a green phosphor ZnS: Cu, copper such as Al (Cu ) And aluminum (Al) -activated zinc sulfide phosphor, ZnS used as a blue phosphor: Ag (Ag), silver (Ag), Al-activated zinc sulfide phosphor, etc. are also inferior in weather resistance. . Even when these phosphors are used, the luminance deterioration of the white LED lamp becomes a problem.
- alkaline earth silicate phosphors used as green to yellow phosphors, oxysulfides used as red phosphors There is a demand for enhancing the weather resistance of zinc sulfide phosphors used as lanthanum phosphors, green phosphors and blue phosphors.
- the problem to be solved by the present invention is to provide a phosphor for a light emitting device having excellent weather resistance, a method for producing the phosphor, and a light emitting device using such a phosphor.
- the phosphor for a light emitting device of the embodiment is a phosphor used for a light emitting device including an LED chip that emits ultraviolet to blue light as an excitation source of the phosphor, and is an alkaline earth silicate phosphor, lanthanum oxysulfide fluorescence And at least one surface treatment agent selected from a silane coupling agent and an acrylic emulsion provided so as to cover the surface of the phosphor particles. It is equipped with.
- the phosphor for the light emitting device is Formula: Luminance B / Luminance A ⁇ 100 (%) (In the formula, the luminance A is the initial luminance obtained by causing the phosphor to emit light at a temperature of 23 ° C.
- the luminance maintenance rate represented by is 98% or more.
- the phosphor for a light emitting device of this embodiment includes phosphor particles and a surface treatment agent provided so as to cover the surface thereof.
- the phosphor particles are at least one selected from alkaline earth silicate phosphors, lanthanum oxysulfide phosphors, and zinc sulfide phosphors.
- the surface treatment agent comprises at least one selected from a silane coupling agent and an acrylic emulsion.
- Alkaline earth silicate phosphors, lanthanum oxysulfide phosphors, and zinc sulfide phosphors are inferior in weather resistance when used alone.
- the phosphor for light emitting device of this embodiment improves the weather resistance by covering the surface of the phosphor particles as described above with a coating of at least one surface treatment agent selected from a silane coupling agent and an acrylic emulsion. It is a thing.
- specific configurations of the phosphor particles and the surface treatment agent will be described.
- an alkaline earth orthosilicate such as (Sr, Ba, Mg) 2 SiO 4 is mainly used (phosphor matrix), and europium (Eu) and manganese ( And phosphors having activated Mn).
- (Sr, Ba, Mg) 2 SiO 4 Eu and Mn-activated alkaline earth silicate phosphors such as Eu and Mn emit green to yellow light by absorbing ultraviolet to blue light emitted from the LED chip. It is a green to yellow light phosphor.
- Eu and Mn activated alkaline earth silicate phosphors can adjust the emission color based on the composition ratio of alkaline earth metals (Sr, Ba, Mg) of the phosphor matrix.
- the emission intensity in the yellow region is changed by substituting part of Sr with Ba in the range of 0.1 to 1.7 mol. can do. Further, by replacing a part of Sr with Mg in the range of 0.01 to 0.15 mol, the emission intensity in the blue region is further substituted with Mn in the range of 0.001 to 0.01 mol. The emission intensity in the red region can be changed.
- the emission spectrum in each wavelength region can be arbitrarily increased or decreased based on the composition ratio of alkaline earth metals (Sr, Ba, Mg) and manganese (Mn).
- the lower limit value of the content of each substitution element described above is set as a range in which an effective change amount of the emission spectrum is obtained, and if it is less than the lower limit value, the emission spectrum cannot be changed effectively.
- the upper limit value of the content of each substituted element is set in consideration of the concentration balance between each element, and a sufficient amount of change in the emission spectrum is obtained. As a result, the desired emission color cannot be obtained.
- the molar ratio of Mg is preferably larger than the molar ratio of Mn. When the molar ratio of Mn is larger than the molar ratio of Mg, the obtained phosphor powder (crystal powder) is colored and the brightness is lowered.
- Eu is an activator (main activator) that forms a luminescent center. Since Eu has a high transition probability, the luminous efficiency of the alkaline earth silicate phosphor can be increased by activating Eu to the alkaline earth silicate that is the phosphor matrix.
- Eu as the main activator is preferably contained by substituting a part of Sr in the range of 0.025 to 0.25 mol.
- the substitution amount (content ratio) of Sr with Eu is more preferably in the range of 0.05 to 0.2 mol. When the content ratio of Eu is out of the above range, the light emission luminance and the light emission chromaticity are lowered.
- Eu and Mn activated alkaline earth silicate phosphors are: General formula: (Sr 2-xyzu Ba x Mg y Eu z Mn u) SiO 4 ... (1) (Wherein x, y, z, and u are 0.1 ⁇ x ⁇ 1.7, 0.01 ⁇ y ⁇ 0.15, 0.025 ⁇ z ⁇ 0.25, 0.001 ⁇ u ⁇ 0. Is a number that satisfies .01) And a green to yellow light phosphor that absorbs ultraviolet or blue light emitted from the LED chip and emits green to yellow light.
- Examples of the lanthanum oxysulfide phosphor include phosphors mainly composed of lanthanum oxysulfide (La 2 O 2 S) (phosphor matrix) and activated by europium (Eu) and samarium (Sm). .
- Eu and Sm-activated lanthanum oxysulfide phosphors are red phosphors that absorb ultraviolet or blue light emitted from LED chips and emit red light.
- Eu is an activator for enhancing the luminous efficiency of lanthanum oxysulfide as a phosphor matrix, and is preferably contained by substituting part of La in a range of 0.074 to 0.29 mol. If the amount of substitution of La by Eu is less than the lower limit value, sufficient luminance cannot be obtained. On the other hand, when the substitution amount of La by Eu exceeds the upper limit value, the luminance decreases due to concentration quenching or the like.
- Sm has the effect of shifting the excitation spectrum of a phosphor based on lanthanum oxysulfide to the longer wavelength side.
- the absorption efficiency of long-wavelength ultraviolet to blue light with a wavelength of 395 to 405 nm is improved, and the light emission efficiency when excited with such light can be improved.
- Sm is preferably contained by substituting a part of La in a range of 0.001 to 0.006 mol. If the substitution amount of La by Sm is less than the lower limit value, sufficient luminance cannot be obtained. On the other hand, when the substitution amount of La by Sm exceeds the upper limit value, the luminance is decreased due to the impurity effect.
- a part of lanthanum (La) is at least one element selected from yttrium (Y) and gadolinium (Gd), specifically, any one of Y, Gd, and Y + Gd. May be substituted.
- Y and Gd have the effect of increasing the emission energy in the red region by being dissolved in the phosphor.
- the substitution amount by Y or Gd is preferably 30 mol% or less of La. .
- Eu and Sm activated lanthanum oxysulfide phosphors are: The general formula: (La 2-xy Eu x Sm y) O 2 S ... (2) (Wherein x and y are numbers satisfying 0.074 ⁇ x ⁇ 0.29 and 0.001 ⁇ y ⁇ 0.006) It is preferable that the phosphor be a red phosphor that emits red light by absorbing ultraviolet or blue light emitted from the LED chip.
- zinc sulfide phosphor zinc sulfide (ZnS) as a main component (phosphor matrix), a phosphor obtained by activating copper (Cu) and aluminum (Al) on the phosphor matrix, or silver (Ag) and aluminum ( Examples include phosphors activated with Al).
- Cu and Al-activated zinc sulfide phosphors are green phosphors that absorb ultraviolet or blue light emitted from the LED chip and emit green light.
- the Ag and Al-activated zinc sulfide phosphor is a blue phosphor that absorbs ultraviolet or blue light emitted from the LED chip and emits blue light.
- Cu is an activator (main activator) that forms an emission center, and by replacing a part of Zn in a range of 0.007 to 0.024 mol%. It is preferable to contain. If the substitution amount of Zn by Cu is less than the lower limit value or exceeds the upper limit value, the light emission luminance and the light emission chromaticity are lowered in any case.
- Al is an activator (co-activator) excited by ultraviolet or blue light, and the main activator emits light with the excitation energy of such a co-activator, whereby the emission brightness of the zinc sulfide phosphor. Can be increased.
- Al is preferably contained by substituting a part of Zn in a range of 0.012 to 0.04 mol%. If the substitution amount of Zn by Al is less than the lower limit value or exceeds the upper limit value, the light emission luminance and the light emission chromaticity are lowered in any case.
- Cu and Al activated zinc sulfide phosphors General formula: (Zn 1-xy Cu x Al y) S ... (3) (Wherein x and y are numbers satisfying 0.00007 ⁇ x ⁇ 0.00024 and 0.00012 ⁇ y ⁇ 0.0004) And a green phosphor that absorbs ultraviolet or blue light emitted from the LED chip and emits green light.
- Ag is an activator (main activator) that forms an emission center, and by replacing a part of Zn in the range of 0.034 to 0.06 mol%. It is preferable to contain.
- the substitution amount of Zn by Ag is less than the lower limit value or exceeds the upper limit value, the emission luminance and the emission chromaticity are lowered in any case.
- Al is an activator (co-activator) excited by ultraviolet or blue light, and the main activator emits light with the excitation energy of such a co-activator, whereby the emission brightness of the zinc sulfide phosphor. Can be increased.
- Al is preferably contained by substituting a part of Zn in a range of 0.04 to 0.07 mol%. If the substitution amount of Zn by Al is less than the lower limit value or exceeds the upper limit value, the light emission luminance and the light emission chromaticity are lowered in any case.
- the method for producing the alkaline earth silicate phosphor, the lanthanum oxysulfide phosphor, and the zinc sulfide phosphor described above is not particularly limited, and can be produced by various known production methods.
- a method for producing Eu and Mn activated alkaline earth silicate ((Sr, Ba, Ca) 2 SiO 4 : Eu, Mn) phosphors is shown below.
- the desired phosphor composition ((Sr 2-xyzu Ba x Mg y Eu z Mn u) SiO 4) Then, if necessary, ammonium chloride or the like is added as a flux, and these are mixed by a dry method.
- strontium oxide, barium oxide, magnesium oxide, and silicon dioxide are mixed at a predetermined ratio, and europium oxide as an activator and an appropriate amount of manganese oxide as a coactivator are added.
- a phosphor material is prepared by adding an appropriate amount of flux.
- carbonates such as strontium carbonate, barium carbonate, and magnesium carbonate may be used as a raw material.
- europium oxalate, europium carbonate, or the like may be used, and as the coactivator, manganese carbonate, manganese oxalate, or the like may be used.
- firing is performed in a reducing atmosphere (for example, an atmosphere of 3 to 10% hydrogen-remaining nitrogen).
- a reducing atmosphere for example, an atmosphere of 3 to 10% hydrogen-remaining nitrogen.
- the firing conditions are preferably 1100 to 1400 ° C. ⁇ 2 to 8 hours in order to control the crystal structure of the phosphor matrix ((Sr, Ba, Mg) 2 SiO 4 ). After firing, it is preferable to cool in the same atmosphere as the firing atmosphere.
- the obtained fired product is washed with ion-exchanged water or the like through a pulverization step, dried, and then subjected to sieving to remove coarse particles as necessary, whereby Eu and Mn activated alkalis are obtained.
- An earth silicate phosphor can be obtained.
- the phosphor material may be fired using a rotary heating furnace as shown below. That is, the above-described phosphor raw material is placed in an inclined manner with respect to the horizontal direction, and is put into a rotatable tubular heating furnace and continuously passed. Then, the phosphor material is rapidly heated to a predetermined firing temperature in the heating furnace, and the furnace is moved from the upper side to the lower side while rolling according to the rotation of the heating furnace. In this way, the phosphor material is heated and fired for a necessary and sufficient time. Thereafter, the fired product is continuously discharged from the heating furnace, and the discharged fired product is rapidly cooled.
- a rotary heating furnace as shown below. That is, the above-described phosphor raw material is placed in an inclined manner with respect to the horizontal direction, and is put into a rotatable tubular heating furnace and continuously passed. Then, the phosphor material is rapidly heated to a predetermined firing temperature in the heating furnace, and the furnace is moved from the upper side to the lower side while rolling according to the
- the inside of the tubular heating furnace and the cooling part of the fired product discharged from the heating furnace are kept in an oxygen-free state from which oxygen has been removed. It is desirable to maintain in an inert gas atmosphere such as nitrogen or a reducing gas atmosphere containing hydrogen.
- an inert gas atmosphere such as nitrogen or a reducing gas atmosphere containing hydrogen.
- a phosphor having excellent luminance characteristics can be obtained efficiently. Further, since aggregation of the phosphor particles can be suppressed, there is no need to further pulverize after firing. For this reason, deterioration of the phosphor due to repeated pulverization steps can be suppressed. Furthermore, since the phosphor raw material is heated and fired while rolling in the heating furnace, phosphor particles having a uniform particle size with a shape close to a sphere can be obtained. By these, it becomes possible to produce Eu and Mn activated alkaline earth silicate phosphors having excellent characteristics at low cost.
- the phosphor particles comprising at least one selected from the alkaline earth silicate phosphors, lanthanum oxysulfide phosphors, and zinc sulfide phosphors described above are poor in weather resistance by themselves. Therefore, the surface of the phosphor particles made of the phosphor is covered with at least one surface treatment agent selected from a silane coupling agent and an acrylic emulsion. Thereby, the weather resistance of the phosphor particles can be improved. That is, it is possible to suppress a decrease in emission luminance of the phosphor particles due to moisture or the like. In particular, it is possible to suppress deterioration and coloring of the phosphor particles in a high temperature and high humidity environment, and a decrease in light emission luminance associated therewith.
- the silane coupling agent as the surface treatment agent is preferably at least one selected from an epoxy group silane coupling agent and an amino group silane coupling agent.
- epoxy group-based silane coupling agent examples include 3-glycidoxypropylmethyldimethoxysilane, 3-glycidoxypropyltrimethoxysilane, 3-glycidoxypropylmethyldiethoxysilane, 3-glycidoxypropyltrimethoxysilane.
- An ethoxysilane etc. are mentioned.
- amino group-based silane coupling agents include N-2- (aminoethyl) -3-aminopropylmethyldimethoxysilane, N-2- (aminoethyl) -3-aminopropyltrimethoxysilane, N-2- (Aminoethyl) -3-aminopropyltriethoxysilane, 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane and the like.
- the acrylic emulsion as the surface treatment agent is preferably a weak alkaline acrylic emulsion, and more preferably has an acrylic / styrene composition.
- an acrylic emulsion coating By covering the surface of the phosphor particles with such an acrylic emulsion coating, the weather resistance of the phosphor particles under high temperature and high humidity is improved, and it is possible to effectively suppress a decrease in luminance over time.
- the acrylic emulsion itself is a non-light emitting component, if it is coated with an excessive amount, it causes a reduction in the light emission luminance of the phosphor particles. Therefore, the acrylic emulsion is preferably added in the range of 0.05 to 5% by mass with respect to the phosphor particles.
- the weather resistance of the phosphor particles can be improved.
- the luminance maintenance ratio represented by the following formula (5) can be 98% or more, and further 99% or more.
- the luminance A is an initial luminance obtained by causing the phosphor to emit light at a temperature of 23 ° C.
- the luminance B is after the phosphor is left to stand for 12 hours at a temperature of 60 ° C. and a humidity of 90%.
- the luminance maintenance rate at high temperature and high humidity of phosphor particles comprising at least one selected from alkaline earth silicate phosphors, lanthanum oxysulfide phosphors, and zinc sulfide phosphors at 98% or higher, It is possible to maintain the luminance of a light emitting device such as a white LED lamp or a single color LED lamp using the LED over a long period of time. That is, it is possible to provide a light emitting device that is excellent in emission luminance and excellent in the maintenance rate of such luminance.
- the surface treatment of the phosphor particles with a silane coupling agent or an acrylic emulsion is preferably performed as follows. First, a phosphor dispersion liquid containing phosphor particles made of at least one selected from alkaline earth silicate phosphors, lanthanum oxysulfide phosphors, and zinc sulfide phosphors is prepared.
- the phosphor dispersion liquid is preferably prepared by dispersing phosphor powder in an alcohol aqueous solution. In such a phosphor dispersion, at least one surface treatment agent selected from a silane coupling agent and an acrylic emulsion is added.
- the silane coupling agent When a silane coupling agent is used as the surface treatment agent, it is preferable to add the silane coupling agent in a range of 0.1 to 40% by mass with respect to the phosphor particles.
- the amount of the silane coupling agent input to the phosphor particles is less than 0.1% by mass, the coating amount by the silane coupling agent is insufficient, and the weather resistance improvement effect of the phosphor particles cannot be sufficiently obtained.
- the amount of the silane coupling agent added to the phosphor particles exceeds 40% by mass, the emission luminance of the phosphor particles is significantly reduced.
- the input amount of the silane coupling agent with respect to the phosphor particles is more preferably in the range of 2 to 25% by mass.
- the acrylic emulsion When an acrylic emulsion is used as the surface treatment agent, it is preferable to add the acrylic emulsion in a range of 0.05 to 5% by mass with respect to the phosphor particles.
- the amount of the acrylic emulsion charged to the phosphor particles is less than 0.05% by mass, the coating amount by the acrylic emulsion is insufficient, and the effect of improving the weather resistance of the phosphor particles cannot be sufficiently obtained.
- the amount of the acrylic emulsion charged into the phosphor particles exceeds 5% by mass, the emission luminance of the phosphor particles is significantly reduced. More preferably, the amount of the acrylic emulsion charged to the phosphor particles is in the range of 0.1 to 3% by mass.
- the phosphor dispersion liquid charged with the surface treatment agent is stirred and mixed.
- a silane coupling agent is used as the surface treatment agent
- the temperature of the phosphor dispersion liquid is preferably maintained at 25 to 70 ° C.
- the mixing time of the phosphor dispersion liquid is preferably 30 to 120 minutes.
- an acrylic emulsion is used as the surface treatment agent
- the temperature of the phosphor dispersion liquid is preferably maintained at 25 to 40 ° C.
- the mixing time of the phosphor dispersion liquid is preferably 30 to 120 minutes.
- the phosphor dispersion liquid after the mixing treatment is filtered to separate the phosphor particles treated with the surface treatment agent.
- the phosphor particles separated by filtration can be dried to obtain a phosphor for a light emitting device in which the surface of the phosphor particles is uniformly coated with a silane coupling agent or an acrylic emulsion.
- a coating film is formed in an amount corresponding to the input amount (preparation amount) of the silane coupling agent or acrylic emulsion. Therefore, it is possible to obtain a phosphor for a light-emitting device having good light emission luminance and excellent weather resistance.
- the light emitting device of the embodiment includes an LED chip that emits ultraviolet to blue light, and a phosphor layer that contains a phosphor that absorbs ultraviolet to blue light emitted from the LED chip and emits visible light.
- a white LED lamp in which a blue light emitting LED chip and a green to yellow phosphor and a red phosphor are combined, an ultraviolet to purple light emitting LED chip and a mixed phosphor of blue, green to yellow and red are used. Examples include a white LED lamp combined with (BGR or BYR phosphor).
- the light emitting device of the embodiment may be a monochromatic LED lamp.
- the phosphor layer contains at least the phosphor of the above-described embodiment. That is, the phosphor layer is composed of green or yellow light emitting Eu and Mn activated alkaline earth silicate phosphors, red light emitting Eu and Sm activated lanthanum oxysulfide phosphors, green light emitting Cu and Al activated zinc sulfide fluorescent materials. And at least one selected from blue-emitting Ag and Al-activated zinc sulfide phosphors.
- the phosphors other than these are appropriately selected based on the configuration of the LED lamp (the light emission color of the lamp, the light emission wavelength of the LED chip, the combination of the phosphors, etc.), and are not particularly limited.
- the light-emitting device of this embodiment exhibits excellent weather resistance based on the phosphor of the above-described embodiment, and is excellent in luminance maintenance rate in a high-temperature and high-humidity environment.
- the luminance maintenance rate represented by the following formula (6) can be 95% or more, and further can be 98% or more.
- Luminance C is the initial luminance when the light emitting device emits light under the conditions of a temperature of 23 ° C. and a humidity of 40%
- the luminance D is the luminance after the light emitting device emits light for 1000 hours at a temperature of 60 ° C. and a humidity of 90%. .
- FIG. 1 is a cross-sectional view showing the configuration of the LED lamp according to the first embodiment.
- the LED lamp 1 shown in the figure has an LED chip 2 as a phosphor excitation source.
- the LED chip 2 is mounted on a wiring board 4 having a pair of lead terminals 3A and 3B.
- the lower electrode of the LED chip 2 is electrically and mechanically connected to the lead terminal 3A.
- the upper electrode of the LED chip 2 is electrically connected to the lead terminal 3 ⁇ / b> B through the bonding wire 5.
- a cylindrical resin frame 6 is provided on the wiring board 4, and a reflection layer 7 is formed on the inner wall surface 6a thereof.
- a transparent resin 8 is filled in the resin frame 6, and the LED chip 2 is embedded in the transparent resin 8.
- the transparent resin 8 for example, a silicone resin or an epoxy resin is used.
- a phosphor 9 is dispersed in the transparent resin 8 in which the LED chip 2 is embedded.
- the transparent resin 8 and the phosphor 9 dispersed therein constitute a phosphor layer 10 that functions as a light emitting layer.
- the phosphor 9 dispersed in the transparent resin 8 emits visible light when excited by ultraviolet or blue light emitted from the LED chip 2.
- the electrical energy applied to the white LED lamp 1 is converted into ultraviolet or blue light by the LED chip 2, and the light is converted into longer wavelength light by the phosphor 9 dispersed in the transparent resin 8. Then, when the light emitted from the LED chip 2 and the light emitted from the phosphor 9 are mixed, or the light emitted from the plurality of kinds of phosphors 9 is mixed, desired white light or the like is emitted from the LED lamp 1. Released.
- FIG. 2 is a cross-sectional view showing the configuration of the LED lamp according to the second embodiment.
- the LED lamp 11 shown in the figure has an LED chip 12 as a phosphor excitation source.
- the LED chip 12 is mounted on the substrate 13.
- the substrate 13 has a wiring network (not shown) provided on its surface (and further inside if necessary), and these constitute a wiring substrate.
- first and second electrodes are provided based on a wiring network (not shown).
- the electrodes (not shown) of the LED chip 12 are electrically connected to a wiring network (including electrodes) (not shown) of the substrate 13.
- the LED chip 12 mounted on the substrate 13 is covered with a phosphor layer 14.
- the phosphor layer 14 includes a transparent resin layer 15 provided so as to cover the upper surface and side surfaces of the LED chip 12, and a phosphor 16 dispersed in the transparent resin layer 15.
- the phosphor layer 14 has a phosphor 16 that emits desired visible light when excited by light emitted from the LED chip 12.
- the electric energy applied to the LED lamp 11 is converted into light having a desired wavelength by the LED chip 12, and further converted into light having a longer wavelength by the phosphor 16 and emitted.
- FIG. 3 is a cross-sectional view showing a configuration of an LED lamp (LED bulb) according to the third embodiment.
- the LED lamp 21 shown in the figure is an LED bulb having an LED module 22 as a phosphor excitation source.
- the LED bulb 21 includes an LED module 22, a base portion 23 on which the LED module 22 is installed, a globe 24 attached on the base portion 23 so as to cover the LED module 22, and an insulating member at a lower end portion of the base portion 23. 25, a base 26 attached via 25, and a lighting circuit (not shown) provided in the base portion 23.
- the LED module 22 includes a plurality of LED chips 28 mounted on a substrate 27.
- a plurality of LED chips 28 are surface mounted on the substrate 27.
- the plurality of LED chips 28 are covered with a transparent resin 29 such as a silicone resin.
- a wiring network (not shown) is provided on the surface of the substrate 27 (and, if necessary, inside), and the electrodes (not shown) of the LED chip 28 are electrically connected to the wiring network of the substrate 27. ing.
- a wiring (not shown) is drawn out on the side surface or bottom surface of the LED module 22, and this wiring is electrically connected to a lighting circuit (not shown) provided in the base portion 23.
- the LED chip 28 is lit by a DC voltage applied through a lighting circuit.
- the globe 24 is made of a translucent member. For example, a glass globe 24 or a resin globe 24 having translucency is used.
- the globe 24 has a size equivalent to, for example, an incandescent bulb.
- a phosphor layer (phosphor film) 30 that absorbs ultraviolet or blue light emitted from the LED chip 28 and emits visible light is provided.
- the phosphor layer 30 is provided on the inner surface of the globe 24 so as to be separated from the LED chip 28.
- the electric energy applied to the LED bulb 21 is converted into ultraviolet-blue light by the LED chip 28, and further converted into light having a longer wavelength by the phosphor layer 30 and emitted.
- the phosphors constituting the phosphor layers 10, 14, and 30 are based on the emission colors of the LED lamps 1, 11, and 21 and the emission wavelengths of the LED chips 2, 12, and 28. Selected. For example, when an LED lamp that emits white light is formed using an LED chip that emits blue light having a peak wavelength of 445 to 455 nm, green to yellow phosphors and red phosphors are used. Examples of the green to yellow phosphors include Eu and Mn activated alkaline earth silicate phosphors and Cu and Al activated zinc sulfide phosphors of the embodiment. Examples of the red phosphor include the Eu and Sm activated lanthanum oxysulfide phosphors of the embodiment.
- a blue phosphor, a green to yellow phosphor, and a red phosphor are used.
- the blue phosphor include the Ag and Al activated zinc sulfide phosphors of the embodiment.
- the green to yellow phosphors include Eu and Mn activated alkaline earth silicate phosphors and Cu and Al activated zinc sulfide phosphors of the embodiment.
- the red phosphor include the Eu and Sm activated lanthanum oxysulfide phosphors of the embodiment.
- the LED lamps 1, 11, and 21 are not limited to white lamps, and may be single color lamps.
- the phosphor layer in the LED lamp of the embodiment contains at least one of the phosphors of the above-described embodiment, and may contain a phosphor other than the phosphor of the embodiment.
- Such phosphors include blue phosphors such as europium (Eu) activated alkaline earth chlorophosphate phosphors, europium (Eu) and manganese (Mn) activated alkaline earth aluminate phosphors, europium ( Examples thereof include green to yellow phosphors such as Eu) activated sialon phosphor, red phosphors such as europium (Eu) activated couun phosphor, and europium (Eu) activated sulfide phosphor.
- a phosphor having a luminescent color other than these, for example, a blue-green phosphor or a deep red phosphor may be included in the phosphor layer.
- the weight was measured based on the composition shown in Table 1.
- ammonium chloride was added as a flux to the phosphor material and mixed well.
- An appropriate amount of activated carbon was added to the obtained phosphor material, filled in an alumina crucible, and fired in a reducing atmosphere (3 to 10% hydrogen—balance nitrogen atmosphere) at 1200 ° C. for 5 hours.
- the obtained fired product was pulverized and sieved, and further fired under conditions of 1250 ° C. ⁇ 5 hours.
- the obtained fired product is pulverized, sieved, washed, dried, and sieved, whereby Eu and Mn-activated alkaline earth silicate ((Sr, Ba, Mg) 2 SiO 4 : Eu, Mn) A phosphor was obtained.
- the phosphor powders of Examples 1 to 10 thus obtained were dispersed in a mixture of water and ethyl alcohol to prepare a phosphor dispersion.
- a silane coupling agent manufactured by Shin-Etsu Silicone
- an acrylic emulsion manufactured by Toyo Ink Co., Ltd.
- the temperature of the phosphor dispersion was 35 ° C., and after stirring the silane coupling agent and acrylic emulsion, the mixture was stirred for 90 minutes. Subsequently, filtration, drying, and sieving were performed to prepare phosphor powders in which the surface of the phosphor particles was uniformly coated with a silane coupling agent or an acrylic emulsion.
- phosphor powder was weighed in a 50 ml beaker and left in a high-temperature and high-humidity bath in a high-temperature and high-humidity atmosphere (temperature 60 ° C., humidity 90%) for 12 hours to perform a forced weather resistance test.
- green to yellow LED lamps were produced as follows. First, phosphor powder was mixed with a mixed liquid of an epoxy resin and an acid anhydride curing agent, and this was dropped on a blue light emitting LED chip (0.4 mm square) using a dispenser, thereby curing the epoxy resin. Later, a hemispherical transparent epoxy resin cap was coated thereon to produce an LED lamp.
- an LED lamp using the phosphor powder subjected to the forced weather resistance test (brightness B measurement lamp / LED lamp B) and the forced weather resistance test were performed.
- An LED lamp (luminance A measurement lamp / LED lamp A) using phosphor powder that was not used was prepared. These LED lamps were allowed to emit light under the conditions of a temperature of 23 ° C. and a humidity of 40%, and the luminance B of the LED lamp B and the luminance A (initial luminance) of the LED lamp A were measured. Further, the luminance maintenance rate was obtained from the luminance B and the luminance A based on the above-described formula (5). Moreover, the presence or absence of the body color change of the fluorescent substance by a forced weather resistance test was investigated. These measurement results are shown in Table 4. This measurement was performed to evaluate the characteristics of the phosphor powder.
- LED lamps (brightness C and brightness D measurement lamps) were produced in the same manner as described above using the phosphor powders of the respective examples (phosphor powders not subjected to the forced weather resistance test).
- the LED lamp was caused to emit light at a temperature of 23 ° C. and a humidity of 40%, and the luminance C (initial luminance) was measured.
- the luminance D after the LED lamp was lit for 1000 hours in a high temperature and high humidity atmosphere (temperature 60 ° C., humidity 90%) was measured. Further, the luminance maintenance rate of the LED lamp was obtained from the luminance D and the luminance C based on the above-described formula (6). These measurement results are shown in Table 5. This measurement was performed to evaluate the characteristics of the LED lamp.
- the phosphor powders of Examples 1 to 10 have a slight luminance due to the surface treatment of the silane coupling agent or acrylic emulsion as compared with the phosphor powders of Comparative Examples 1 to 10. Although there is a difference, it can be seen that the luminance maintenance rate is high even after the forced weather resistance test under a high temperature and high humidity atmosphere (temperature 60 ° C., humidity 90%), and the weather resistance is excellent.
- the phosphors of the examples surface-treated with a silane coupling agent or an acrylic emulsion did not show any change in body color, but the surface treatment was not compared
- a phenomenon that the body color turned white was observed in part.
- a peak of strontium carbonate was confirmed in all cases. This is thought to be caused by the reaction of the moisture in the high-temperature and high-humidity atmosphere with Sr of the phosphor matrix. As the Sr ratio in the alkaline earth metal increases, the degree of whitening increases and the luminance is maintained. The rate also got worse.
- the phosphor powder is subjected to a high temperature and high humidity atmosphere (temperature 60 ° C., humidity 90%). Even when the forced weather resistance test is performed, it is possible to suppress a decrease in luminance. That is, it becomes possible to provide Eu and Mn activated alkaline earth silicate phosphors excellent in weather resistance.
- the composition having a higher Sr ratio in the alkaline earth metal has a greater deterioration under high temperature and high humidity. Therefore, surface treatment with a silane coupling agent or acrylic emulsion is particularly effective for Eu and Mn activated alkaline earth silicate phosphors containing Sr in a range of 1 to 1.7 mol.
- the green to yellow LED lamps according to Examples 1 to 10 were compared with the green to yellow LED lamps according to Comparative Examples 1 to 10 on the surface of the silane coupling agent or acrylic emulsion. There is almost no difference in the initial luminance due to the presence or absence of treatment, and the luminance maintenance rate is high even after a 1000-hour lighting test (weather resistance test) in a high temperature and high humidity atmosphere (temperature 60 ° C., humidity 90%). It can be seen that the weather resistance is excellent.
- the phosphor of Example 5 surface treatment with a silane coupling agent / green emission phosphor
- the phosphor of Example 6 surface treatment with a silane coupling agent
- the emission color from the LED lamp is white.
- Yellow-emitting phosphor and red-emitting CaAlSiN 3 : Eu phosphor.
- GYR phosphor Green LED lamp
- the phosphor of Example 7 surface treatment with acrylic emulsion / green light-emitting phosphor
- the phosphor of Example 8 surface treatment with acrylic emulsion / yellow
- the emission color from the LED lamp is white.
- Luminescent phosphor red-emitting CaAlSiN 3 : Eu phosphor
- GYR phosphor red-emitting phosphor
- luminance C initial luminance
- luminance D after the white LED lamp was lit for 1000 hours in a high temperature and high humidity atmosphere (temperature 60 ° C., humidity 90%) was measured.
- the luminance maintenance rate of the white LED lamp was obtained from the luminance D and the luminance C based on the above-described formula (6).
- the white LED lamps according to Examples 11 to 12 are different from the white LED lamps according to Comparative Examples 1 to 10 in the difference in initial luminance depending on the presence or absence of the surface treatment of the silane coupling agent or acrylic emulsion.
- the brightness maintenance rate is high even after a 1000 hour lighting test (weather resistance test) in a high temperature and high humidity atmosphere (temperature 60 ° C., humidity 90%), and the weather resistance is excellent. I understand.
- a red light emitting La 2 O 2 S: Eu, Sm phosphor, a green light emitting ZnS: Cu, Al phosphor, and a blue light emitting ZnS: Ag, Al phosphor are prepared, and these are prepared with water and ethyl alcohol.
- a phosphor dispersion liquid was prepared by dispersing in the liquid mixture.
- a silane coupling agent manufactured by Shin-Etsu Silicone
- an acrylic emulsion manufactured by Toyo Ink Co., Ltd.
- the temperature of the phosphor dispersion was 35 ° C., and after stirring the silane coupling agent and acrylic emulsion, the mixture was stirred for 90 minutes. Subsequently, filtration, drying, and sieving were performed to prepare phosphor powders in which the surface of the phosphor particles was uniformly coated with a silane coupling agent or an acrylic emulsion.
- a monochromatic LED lamp was produced in the same manner as in the above-described example. Using such a monochromatic LED lamp, the luminance A and the luminance B were measured in the same manner as in the above-described example.
- luminance D were measured similarly to the Example mentioned above using the monochromatic LED lamp using the fluorescent substance powder which has not performed the forced weather resistance test. From these measurement results, the luminance maintenance rate (B / A) of the phosphor powder and the luminance maintenance rate (D / C) of the LED lamp were determined. Tables 9 and 10 show the results and the presence or absence of changes in the body color of the phosphors by the forced weather resistance test.
- the phosphor powders of Examples 13 to 18 had a slight luminance due to the surface treatment of the silane coupling agent or acrylic emulsion as compared with the phosphor powders of Comparative Examples 13 to 18. Although there is a difference, it can be seen that the luminance maintenance rate is high even after the forced weather resistance test under a high temperature and high humidity atmosphere (temperature 60 ° C., humidity 90%), and the weather resistance is excellent.
- the LED lamps according to Examples 13 to 18 have almost no difference in initial luminance due to the presence or absence of surface treatment of the silane coupling agent or acrylic emulsion, compared with the LED lamps according to Comparative Examples 13 to 18.
- the luminance maintenance rate is high and the weather resistance is excellent. .
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Abstract
Description
式:輝度B/輝度A×100(%)
(式中、輝度Aは蛍光体を温度23℃、湿度40%の条件下で発光させた初期輝度であり、輝度Bは蛍光体を温度60℃、湿度90%の条件下で12時間放置した後に、温度23℃、湿度40%の条件下で発光させた輝度である。)
で表される輝度維持率が98%以上である。
一般式:(Sr2-x-y-z-uBaxMgyEuzMnu)SiO4 …(1)
(式中、x、y、z、及びuは0.1≦x≦1.7、0.01≦y≦0.15、0.025≦z≦0.25、0.001≦u≦0.01を満足する数である)
で表される組成を有し、LEDチップから出射された紫外乃至青色光を吸収して緑色乃至黄色光を発光する緑色乃至黄色光蛍光体であることが好ましい。
一般式:(La2-x-yEuxSmy)O2S …(2)
(式中、x及びyは0.074≦x≦0.29、0.001≦y≦0.006を満足する数である)
で表される組成を有し、LEDチップから出射された紫外乃至青色光を吸収して赤色光を発光する赤色蛍光体であることが好ましい。
一般式:(Zn1-x-yCuxAly)S …(3)
(式中、x及びyは0.00007≦x≦0.00024、0.00012≦y≦0.0004を満足する数である)
で表される組成を有し、LEDチップから出射された紫外乃至青色光を吸収して緑色光を発光する緑色蛍光体であることが好ましい。
一般式:(Zn1-x-yAgxAly)S …(4)
(式中、x及びyは0.00034≦x≦0.0006、0.0004≦y≦0.0007を満足する数である)
で表される組成を有し、LEDチップから出射された紫外乃至青色光を吸収して青色光を発光する青色蛍光体であることが好ましい。
式:輝度B/輝度A×100(%) …(5)
ここで、輝度Aは蛍光体を温度23℃、湿度40%の条件下で発光させた初期輝度であり、輝度Bは蛍光体を温度60℃、湿度90%の条件下で12時間放置した後に、温度23℃、湿度40%の条件下で発光させた輝度である。
式:輝度D/輝度C×100(%) …(6)
輝度Cは発光装置を温度23℃、湿度40%の条件下で発光させた初期輝度、輝度Dは発光装置を温度60℃、湿度90%の条件下で1000時間発光させた後の輝度である。
まず、Eu及びMn付活アルカリ土類珪酸塩蛍光体を作製し、この蛍光体粉末及びそれを用いた緑色乃至黄色発光の単色ランプの特性を評価した。
シランカップリング剤やアクリルエマルジョンによる表面処理を実施していない以外は、実施例1~10と同様にして同一組成のEu及びMn付活アルカリ土類珪酸塩((Sr,Ba,Mg)2SiO4:Eu,Mn)蛍光体を作製した。これらの蛍光体粉末を用いて、実施例と同様にして輝度Aと輝度Bの測定、さらに輝度Cと輝度Dの測定を実施した。これらの測定結果から蛍光体粉末の輝度維持率(B/A)とLEDランプの輝度維持率(D/C)を求めた。これらの結果と強制耐候性試験による蛍光体の体色変化の有無を表4及び表5に示す。なお、表4及び表5における実施例の初期輝度A、Cは、それぞれ同組成の蛍光体を用いた比較例の初期輝度A、Cを100%としたときの相対値で示す。
次に、Eu及びMn付活アルカリ土類珪酸塩蛍光体を用いて白色LEDランプを作製し、その特性を評価した。
シランカップリング剤やアクリルエマルジョンによる表面処理していない比較例5~6の蛍光体、及び比較例7~8の蛍光体を用いる以外は、実施例11~12と同様にして白色LEDランプを作製した。これらの白色LEDランプを用いて、実施例と同様にして輝度Cと輝度Dの測定を実施し、さらに白色LEDランプの輝度維持率(D/C)を求めた。これらの結果を表6に示す。なお、表6における実施例の初期輝度Cは、それぞれ同組成の蛍光体を用いた比較例の初期輝度Cを100%としたときの相対値で示す。
Eu及びSm付活酸硫化ランタン蛍光体とCu及びAl付活硫化亜鉛蛍光体とAg及びAl付活硫化亜鉛蛍光体の特性、及びそれらを用いた単色ランプの特性を評価した。
実施例13~18と同一組成を有し、シランカップリング剤やアクリルエマルジョンによる表面処理を実施していない蛍光体粉末を用いて、実施例と同様にして輝度Aと輝度Bの測定、さらに輝度Cと輝度Dの測定を実施した。これらの測定結果から蛍光体粉末の輝度維持率(B/A)とLEDランプの輝度維持率(D/C)を求めた。これらの結果と強制耐候性試験による蛍光体の体色変化の有無を表9及び表10に示す。なお、表9及び表10における実施例の初期輝度A、Cは、それぞれ同組成の蛍光体を用いた比較例の初期輝度A、Cを100%としたときの相対値で示す。
Claims (15)
- 蛍光体の励起源として紫外乃至青色光を出射するLEDチップを備える発光装置に用いられる蛍光体であって、
アルカリ土類珪酸塩蛍光体、酸硫化ランタン蛍光体、及び硫化亜鉛蛍光体から選ばれる少なくとも1種からなる蛍光体粒子と、前記蛍光体粒子の表面を覆うように設けられ、シランカップリング剤及びアクリルエマルジョンから選ばれる少なくとも1種の表面処理剤とを具備し、
式:輝度B/輝度A×100(%)
(式中、輝度Aは蛍光体を温度23℃、湿度40%の条件下で発光させた初期輝度であり、輝度Bは蛍光体を温度60℃、湿度90%の条件下で12時間放置した後に、温度23℃、湿度40%の条件下で発光させた輝度である。)
で表される輝度維持率が98%以上であることを特徴とする発光装置用蛍光体。 - 請求項1記載の発光装置用蛍光体において、
前記表面処理剤は、エポキシ基系シランカップリング剤及びアミノ基系シランカップリング剤から選ばれる少なくとも1種であることを特徴とする発光装置用蛍光体。 - 請求項2記載の発光装置用蛍光体において、
前記シランカップリング剤は、N-2-(アミノエチル)-3-アミノプロピルメチルジメトキシシラン、N-2-(アミノエチル)-3-アミノプロピルトリメトキシシラン、N-2-(アミノエチル)-3-アミノプロピルトリエトキシシラン、3-アミノプロピルトリメトキシシラン、3-アミノプロピルトリエトキシシラン、3-グリシドキシプロピルメチルジメトキシシラン、3-グリシドキシプロピルトリメトキシシラン、3-グリシドキシプロピルメチルジエトキシシラン、及び3-グリシドキシプロピルトリエトキシシランから選ばれる少なくとも1種であることを特徴とする発光装置用蛍光体。 - 請求項1記載の発光装置用蛍光体において、
前記表面処理剤は、弱アルカリ性のアクリルエマルジョンであることを特徴とする発光装置用蛍光体。 - 請求項1記載の発光装置用蛍光体において、
前記蛍光体粒子は、
一般式:(Sr2-x-y-z-uBaxMgyEuzMnu)SiO4
(式中、x、y、z、及びuは0.1≦x≦1.7、0.01≦y≦0.15、0.025≦z≦0.25、0.001≦u≦0.01を満足する数である)
で表される組成を有する、緑色乃至黄色発光のユーロピウム及びマンガン付活アルカリ土類珪酸塩蛍光体からなることを特徴とする発光装置用蛍光体。 - 請求項1記載の発光装置用蛍光体において、
前記蛍光体粒子は、
一般式:(La2-x-yEuxSmy)O2S
(式中、x及びyは0.074≦x≦0.29、0.001≦y≦0.006を満足する数である)
で表される組成を有する、赤色発光のユーロピウム及びサマリウム付活酸硫化ランタン蛍光体からなることを特徴とする発光装置用蛍光体。 - 請求項1記載の発光装置用蛍光体において、
前記蛍光体粒子は、
一般式:(Zn1-x-yCuxAly)S
(式中、x及びyは0.00007≦x≦0.00024、0.00012≦y≦0.0004を満足する数である)
で表される組成を有する、緑色発光の銅及びアルミニウム付活硫化亜鉛蛍光体からなることを特徴とする発光装置用蛍光体。 - 請求項1記載の発光装置用蛍光体において、
前記蛍光体粒子は、
一般式:(Zn1-x-yAgxAly)S
(式中、x及びyは0.00034≦x≦0.0006、0.0004≦y≦0.0007を満足する数である)
で表される組成を有する、青色発光の銀及びアルミニウム付活硫化亜鉛蛍光体からなることを特徴とする発光装置用蛍光体。 - 蛍光体の励起源として紫外乃至青色光を出射するLEDチップを備える発光装置に用いられる蛍光体の製造方法であって、
アルカリ土類珪酸塩蛍光体、酸硫化ランタン蛍光体、及び硫化亜鉛蛍光体から選ばれる少なくとも1種からなる蛍光体粒子を含む蛍光体分散液中に、シランカップリング剤及びアクリルエマルジョンから選ばれる少なくとも1種の表面処理剤を投入する工程と、
前記表面処理剤が投入された蛍光体分散液を撹拌して混合する工程と、
前記蛍光体分散液を濾過し、前記表面処理剤で処理された蛍光体粒子を分離する工程と、
前記分離された蛍光体粒子を乾燥させる工程と
を具備することを特徴とする発光装置用蛍光体の製造方法。 - 請求項9記載の発光装置用蛍光体の製造方法において、
前記シランカップリング剤を、前記蛍光体粒子に対して0.1質量%以上40質量%以下の範囲で投入することを特徴とする発光装置用蛍光体の製造方法。 - 請求項9記載の発光装置用蛍光体の製造方法において、
前記アクリルエマルジョンを、前記蛍光体粒子に対して0.05質量%以上5質量%以下の範囲で投入することを特徴とする発光装置用蛍光体の製造方法。 - 紫外乃至青色発光のLEDチップと、
前記LEDチップから出射された紫外乃至青色光を吸収して可視光を発光する蛍光体を含有する蛍光体層とを具備し、
前記蛍光体は、請求項1記載の発光装置用蛍光体を少なくとも含むことを特徴とする発光装置。 - 請求項12記載の発光装置において、
式:輝度D/輝度C×100(%)
(式中、輝度Cは発光装置を温度23℃、湿度40%の条件下で発光させた初期輝度であり、輝度Dは発光装置を温度60℃、湿度90%の条件下で1000時間発光させた後の輝度である。)
で表される輝度維持率が95%以上であることを特徴とする発光装置。 - 請求項12記載の発光装置において、
前記LEDチップはピーク波長が445nm以上455nm以下の範囲の青色光を出射し、
前記蛍光体層は、前記アルカリ土類珪酸塩蛍光体からなる蛍光体粒子を備える緑色乃至黄色蛍光体と、赤色蛍光体とを含有し、前記LEDチップから出射された前記青色光により励起されて緑色乃至黄色光と赤色光とを発光し、
前記LEDチップから出射された前記青色光と前記蛍光体層から発光される前記緑色乃至黄色光及び前記赤色光との混色により白色光を得ることを特徴とする発光装置。 - 請求項12記載の発光装置において、
前記LEDチップはピーク波長が360nm以上440nm以下の範囲の紫外乃至紫色光を出射し、
前記蛍光体層は青色蛍光体、緑色蛍光体、及び赤色蛍光体を含有し、前記LEDチップから出射された前記紫外乃至紫色光により励起されて白色光を発光することを特徴とする発光装置。
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JPWO2015046004A1 (ja) * | 2013-09-25 | 2017-03-09 | 信越化学工業株式会社 | 赤外蛍光体 |
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CN103328607B (zh) | 2015-05-20 |
US20140008690A1 (en) | 2014-01-09 |
CN103328607A (zh) | 2013-09-25 |
US9231150B2 (en) | 2016-01-05 |
KR20130091356A (ko) | 2013-08-16 |
JP5813096B2 (ja) | 2015-11-17 |
KR101528413B1 (ko) | 2015-06-11 |
JPWO2012124302A1 (ja) | 2014-07-17 |
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