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  • C09K11/7737—Phosphates
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  • C09K11/7766—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
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  • C09K11/77—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing rare earth metals
  • C09K11/7783—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals one of which being europium
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  • C09K11/77—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing rare earth metals
  • C09K11/7783—Luminescent materials, e.g. electroluminescent or chemiluminescent containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals one of which being europium
  • C09K11/7797—Borates
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
  • H01J11/00—Gas-filled discharge tubes with alternating current induction of the discharge, e.g. alternating current plasma display panels [AC-PDP]; Gas-filled discharge tubes without any main electrode inside the vessel; Gas-filled discharge tubes with at least one main electrode outside the vessel
  • H01J11/10—AC-PDPs with at least one main electrode being out of contact with the plasma
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
  • H01J61/00—Gas-discharge or vapour-discharge lamps
  • H01J61/02—Details
  • H01J61/38—Devices for influencing the colour or wavelength of the light
  • H01J61/42—Devices for influencing the colour or wavelength of the light by transforming the wavelength of the light by luminescence
  • H01J61/44—Devices characterised by the luminescent material
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  • H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
  • H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
  • H10H20/80—Constructional details
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  • H10H20/80—Constructional details
  • H10H20/85—Packages
  • H10H20/851—Wavelength conversion means
  • H10H20/8511—Wavelength conversion means characterised by their material, e.g. binder
  • H10H20/8512—Wavelength conversion materials
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  • H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
  • H10W72/00—Interconnections or connectors in packages
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  • H10W72/015—Manufacture or treatment of bond wires
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  • H10W90/00—Package configurations
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  • H10W90/751—Package configurations characterised by the relative positions of pads or connectors relative to package parts of bond wires
  • H10W90/756—Package configurations characterised by the relative positions of pads or connectors relative to package parts of bond wires between a chip and a stacked lead frame, conducting package substrate or heat sink

Definitions

• the present invention relates to a UV-excited or visible-light-excited phosphor used for various light-emitting devices, a method for manufacturing the same, and a light-emitting device using the phosphor and a method for manufacturing the same.
• Ultraviolet-excited phosphors emit visible light (so-called light emission) by irradiating ultraviolet rays of various wavelengths.
• rare gas discharge wavelength: mainly 147nm, 172nm
• mercury wavelength: mainly 254nm
• black light wavelength: mainly 360nm
• UV LED wavelength: mainly 380nm
• rare gas discharge power is used for plasma display panels
• mercury is used for cold cathode discharge lamps and fluorescent lamps used for backlights
• ultraviolet LEDs LEDs that emit ultraviolet light
• Phosphors emit light with ultraviolet rays having various wavelengths, and the emission characteristics are unique to the phosphors.
• red-emitting Y O: Eu used in cold cathode discharge lamps and fluorescent lamps
• Patent Document 1 and Patent Document 2 describe ultraviolet-excited phosphors used for plasma display panels, rare gas discharge lamps, and the like.
• the phosphors described in these patent documents are intended to improve the light emission intensity and the light emission maintenance ratio by improving the composition.
• Patent Document 1 describes an ultraviolet-excited phosphor having a luminance maintenance rate of 97% after 1000 hours of continuous light emission operation.
• Patent Document 1 JP 2002-348571
• Patent Document 2 JP 2004-203980 A
• An object of the present invention is to provide a phosphor having improved lifetime characteristics represented by a luminance maintenance ratio by continuous operation for a long time, a method for manufacturing the phosphor, a light emitting device using the phosphor, and a method for manufacturing the phosphor. It is aimed.
• the phosphor according to one embodiment of the present invention is a phosphor that is excited by ultraviolet rays or visible light, and has an xy coordinate as an emission color when the phosphor is excited at a wavelength in a range of 100 nm to 500 nm.
• the difference between the maximum and minimum values of the x coordinate and the difference between the maximum and minimum values of the y coordinate is 0.020 or less, respectively.
• a method for producing a phosphor according to another embodiment of the present invention includes a phosphor in a range of 100 nm to 500 nm. Exciting at the wavelength of the surroundings, measuring the emission color by each wavelength, and when expressing the emission color in the xy coordinate system, the difference between the maximum value and minimum value of the x coordinate and the maximum value and minimum value of the y coordinate And a step of selecting phosphors each having a difference of 0.020 or less.
• a light emitting device includes an excitation source that emits ultraviolet light or visible light, and a light emitting unit that emits visible light when excited by the ultraviolet light or visible light emitted from the excitation source.
• the emission color when excited with a wavelength in the range of 100 nm to 500 nm is expressed in the xy coordinate system, the difference between the maximum value and minimum value of the X coordinate and the difference between the maximum value and minimum value of the y coordinate are And a light emitting portion containing at least a phosphor of 0.020 or less.
• a method for manufacturing a light-emitting device includes a step of exciting a phosphor with a wavelength in a range of 100 nm to 5 OOnm and measuring a color emitted by each wavelength; selecting a phosphor having a difference between the maximum value and minimum value of the X coordinate and the difference between the maximum value and minimum value of the y coordinate when expressed in the xy coordinate system is 0.020 or less, and at least the selection And a step of producing a light emitting portion that emits visible light when excited with ultraviolet light or visible light emitted from an excitation source.
• FIG. 1 is a cross-sectional view showing a configuration of an LED lamp according to an embodiment of a light-emitting device of the present invention.
• FIG. 2 is a partial cross-sectional view showing a configuration of a fluorescent lamp according to another embodiment of the light emitting device of the present invention.
• LED lamp 1. LED lamp, 2. LED chip, 3. Lead terminal, 4. Substrate, 5. Bonding wire, 6. Resin frame, 7. Reflection Layer, 8. transparent resin, 9. phosphor, 11. • fluorescent lamp, 12. glass bulb, 13. fluorescent film, 14. stem part.
• the phosphor according to the embodiment of the present invention is composed of a phosphor material that is excited by ultraviolet rays or visible light.
• the composition is not particularly limited as long as it is an ultraviolet excitation type or visible light excitation type phosphor.
• the emission color is not particularly limited, and may be any of red light emission, blue light emission, and green light emission.
• Eu activated rare earth oxide phosphor Eu activated rare earth oxysulfide phosphor, Eu activated rare earth borate phosphor, Eu activated aluminate phosphor, Eu activated halophosphate phosphor Mn activated zinc silicate phosphor, Eu and Mn activated aluminate phosphor, Eu activated alkaline earth silicate phosphor, Tb activated rare earth silicate phosphor, Tb activated rare earth borate phosphor, Various phosphors such as a Tb-activated rare earth phosphate phosphor can be applied.
• the activator is appropriately selected according to the emission color.
• the phosphor may be either an ultraviolet excitation type or a visible light excitation type, but is particularly effective for an ultraviolet excitation type phosphor in which various wavelengths are used as an excitation source.
• the phosphor of this embodiment has a maximum value and a minimum value of the X coordinate when the emission color (emission color by each wavelength) when excited at a wavelength in the range of 100 nm to 500 nm is expressed in the xy coordinate system.
• the difference and the difference between the maximum value and the minimum value of the y-coordinate satisfy 0 ⁇ 020 or less. According to such a phosphor, an excellent luminance maintenance rate can be obtained.
• the phosphor emits light when excited at a specific wavelength according to its composition. Therefore, in the past, the emission color was inspected only at the excitation wavelength. However, it was not always possible to extract phosphors with good characteristics by inspection only at specific wavelengths. For example, in an ultraviolet-excited phosphor, phosphor particles absorb the irradiated ultraviolet light, energy conversion occurs in the particles, and visible light having a wavelength corresponding to the energy level of the added activator is emitted. When the wavelength of ultraviolet rays is different, the excitation band in the phosphor to be absorbed and the ultraviolet absorption position in the particles, specifically the distance from the surface, are different, and finally the light emitted from the activator is affected.
• a phosphor with good lifetime characteristics in a light emitting device has a small variation in emission color when irradiated with ultraviolet rays of various wavelengths, and a phosphor with poor lifetime characteristics emits ultraviolet rays of various wavelengths. It was found that there was a large variation in emission color. In other words, even if the phosphor excitation band or the ultraviolet absorption position in the phosphor particles changes, the phosphor does not affect the emission color, that is, the phosphor has a structure with a stable crystal and few defects, and has a lifetime characteristic. It is considered good.
• the phosphor excitation band or the ultraviolet absorption position in the phosphor particles is changed, the phosphor that has an effect on the emission characteristics, that is, the emission color, has a structure with unstable crystals and many defects, and has a lifetime characteristic. It is considered bad.
• the phosphor is composed of various compounds such as metal oxides, aluminates, borates and the like. Each phosphor is prepared so as to have a desired composition ratio. Conventional phosphors have mainly been formulated so as to achieve the target composition ratio. However, even if the composition ratios of the actual phosphors are the same, it has been found that there are variations at the atomic level such as the lattice constant. That is, it was found that the crystal state is unstable and there are many defects.
• the lattice constant varies means that when the phosphor particles are observed in a single particle unit, for example, there is a difference in the lattice constant between the surface and the inside of the phosphor particles. Further, when the phosphor particles are compared with each other, even if the composition ratio is the same, it means that the phosphors having different lattice constants are mixed. When the phosphor in such a state is irradiated with excitation light of a predetermined wavelength, the excitation state in each phosphor is different based on the difference in the lattice constants (difference in the absorption state of the excitation light). I found it to happen.
• a specific wavelength range (specifically, 100 ⁇
• the emission color is measured in the range of m to 500 nm), and the difference between the maximum and minimum x-coordinates of the emission color and the difference between the maximum and minimum y-coordinates at each wavelength is important.
• the emission color is measured in a wide wavelength range from lOOnm to 500nm, and the difference between the maximum and minimum values of the x coordinate and the difference between the maximum and minimum values of the y coordinate is 0.0020 or less, respectively. In this case, an excellent luminance maintenance rate can be obtained.
• the wavelength used for the phosphor characteristic evaluation is 100 ⁇
• the wavelength of m to 500 nm is selected is that the wavelength of ultraviolet rays and visible light includes this range.
• a phosphor that is excited by ultraviolet light or visible light includes all excitation wavelengths, and therefore uses a wavelength in the range of 100 nm to 500 nm.
• the phosphor of this embodiment is produced, for example, as follows. First, the phosphor is excited while changing the wavelength in the range of 100 nm to 5 OOnm, and the emission color of the phosphor is measured by a method according to the CIE chromaticity coordinates. Obtain the luminescent color of the phosphor at each wavelength as the xy coordinate value.
• the regular wavelength is selected in units of 50 nm so that it is 100 nm, 150 nm, 200 nm, 500 nm, etc.
• the measurement wavelength can be selected in a narrower range, but the lifetime characteristics of the phosphor can be sufficiently evaluated by selecting the measurement wavelength in units of 50 nm from the range of 100 nm to 500 nm.
• the phosphor manufacturing method described above it is possible to obtain a phosphor exhibiting a good luminance maintenance rate regardless of the phosphor composition. Furthermore, the lifetime characteristics when a phosphor is applied to a light-emitting device in the past is a force that was not known until it was incorporated into the light-emitting device. Can also be inspected. This greatly contributes not only to extending the life of light-emitting devices but also to improving reliability. In addition, the measurement of the luminescent color of the phosphor (phosphor detection) may be performed for each phosphor, or about 0.:! To 5 kg may be performed collectively.
• the phosphor of this embodiment can be obtained based on the selection step described above. Furthermore, in producing the phosphor of this embodiment, it is also effective to apply the following manufacturing process to suppress variations in the crystal structure of the phosphor. That is, various factors such as the non-uniformity of the raw material powder and the variation in the blending process can be cited as causes of the crystal structure variation such as the lattice constant of the phosphor. For example, purity and particle size of raw material powder, firing temperature during preparation In addition, the firing time has been conventionally controlled. However, this proved to be insufficient.
• the phosphor of this embodiment it is preferable to uniformize the way heat is transferred in the crucible in order to suppress the above-described variation.
• Specific examples include good thermal conductivity, the use of a crucible, and the amount of raw material powder filled in the crucible being 1/2 or less of the crucible volume.
• Examples of crucibles having good thermal conductivity include crucibles made of refractory metals such as tungsten, molybdenum and tantalum or alloys thereof.
• the raw material powder to be filled in the crucible to 1/2 or less of the crucible volume, the heat transfer on the inner wall side and the center side of the crucible can be made uniform, and the occurrence of uneven firing is suppressed. That power S.
• the phosphor according to the embodiment of the present invention is suitable for the phosphor constituting the light emitting portion of the light emitting device.
• the phosphor of this embodiment and other phosphors (the present invention) It is also possible to use in combination with a phosphor outside this range.
• the lifetime characteristics of the light-emitting device can be improved if the phosphor powder of this embodiment is contained in 70% by mass or more of the total phosphors. .
• a light emitting device includes an excitation source that emits ultraviolet light or visible light, and a light emitting unit that emits visible light when excited by ultraviolet light or visible light emitted from the excitation source.
• a light emitting section is constituted by the phosphor of this embodiment or a phosphor group in which it is combined with other phosphors.
• Specific examples of such a light emitting device include a fluorescent lamp, Examples include cold cathode discharge lamps, plasma displays, and LED lamps. LED lamps are driven by light-emitting semiconductor elements such as LED chips and laser diodes (semiconductor lasers). Therefore, the LED lamp can be rephrased as a semiconductor lamp.
• FIG. 1 is a sectional view showing a configuration of an embodiment in which the light emitting device of the present invention is applied to an LED lamp.
• a light emitting device (LED lamp) 1 shown in the figure has an LED chip 2 as an excitation source.
• the excitation source of the light emitting device 1 is not limited to the LED chip 2, but may be a laser diode (semiconductor laser) or the like.
• the LED chip 2 is mounted on a substrate 4 having a pair of lead terminals 3a 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 3b through the bonding wire 5.
• the LED lamp 1 for example, a light source that emits ultraviolet light is used as an excitation source. Therefore, the LED chip 2 that emits ultraviolet light is used as the excitation source.
• an ultraviolet light emitting type LED chip 2 typically has an emission wavelength in the range of 360 to 420 nm.
• the ultraviolet light emitting LED chip 2 is exemplified by a LED chip having a light emitting layer made of a nitride compound semiconductor layer. Note that the emission wavelength of the LED chip 2 is not limited as long as the desired emission color can be obtained based on the combination with the phosphor. Accordingly, the LED chip is not necessarily limited to an LED chip having an emission wavelength in the range of 360 to 420 nm.
• light emitting semiconductor elements laser diodes, etc.
• other than LED chips can be used as excitation sources.
• a cylindrical resin frame 6 is provided on the substrate 4, and a reflection layer 7 is formed on the inner wall surface 6 a thereof.
• a transparent resin 8 is filled in the resin frame 6, and the LED chip 2 is carried in the transparent resin 8.
• the LED chip 2 is covered with a transparent resin 8.
• the transparent resin 8 in which the LED chip 2 is embedded contains an ultraviolet-excited phosphor 9.
• the phosphor 9 dispersed in the transparent resin 8 emits visible light when excited by light emitted from the LED chip 2, for example, ultraviolet light.
• the transparent resin 8 containing the phosphor 9 functions as a light emitting part, and is disposed in front of the LED chip 2 in the light emitting direction.
• a silicone resin or an epoxy resin is used for the transparent resin 8.
• the phosphor 9 constituting such a light emitting part the phosphor or phosphor group of the above-described embodiment is used. Phosphor and phosphor of the embodiment described above Since the group has excellent lifetime characteristics (luminance maintenance ratio), the lifetime of the light emitting device can be extended. In particular, when a continuous operation is performed for a long time, for example, 3000 hours or more, or even 5000 hours or more, it is possible to suppress a decrease in luminance of the light emitting device (LED lamp 1). In other words, it is suitable for a light-emitting device that is always lit.
• the type and combination of the phosphors 9 dispersed in the transparent resin 8 are appropriately selected according to the emission color of the target LED lamp 1, and are not particularly limited. .
• the LED lamp 1 is used as a white light emitting LED lamp (white white LED lamp)
• a mixture of a blue light emitting phosphor, a green light emitting phosphor and a red light emitting phosphor is used.
• it is possible to use one or a combination of two or more phosphors such as a blue light-emitting phosphor, a green light-emitting phosphor, and a red light-emitting phosphor.
• FIG. 2 is a diagram showing a configuration of an embodiment in which the light emitting device of the present invention is applied to a fluorescent lamp.
• a fluorescent lamp 11 shown in the figure includes a glass bulb 12.
• a fluorescent film 13 is formed on the inner surface side of the glass bulb 12.
• the phosphor film 13 contains the phosphor or phosphor group of the above-described embodiment. That is, on the inner surface of the glass bulb 12, a phosphor film 13 containing the phosphor or phosphor group of the above-described embodiment is deposited as a phosphor for a fluorescent lamp such as a three-wavelength phosphor. .
• the fluorescent film 13 constitutes a light emitting part.
• Stem portions 14 are sealed at both ends of the glass bulb 12 as electrode sealing portions.
• a predetermined amount of mercury and a rare gas having a predetermined pressure are sealed as a discharge gas, and a fluorescent lamp 11 is constituted by these.
• the fluorescent lamp 11 mainly obtains visible light by applying a predetermined voltage to electrodes at both ends to generate a positive column discharge and exciting the fluorescent film 12 with ultraviolet rays generated by the discharge. That is, mercury sealed in the glass bulb 12 serves as an excitation source for the fluorescent film 13.
• the lifetime of the fluorescent lamp 11 can be extended.
• a decrease in luminance of the fluorescent lamp 11 can be suppressed.
• PDP plasma display
• a cold cathode discharge lamp and the like.
• Luminance maintenance rate is as follows: Luminance L at initial emission, L after 1000 hours of continuous lighting
• Example 1 1 (Ba, Sr) MgAl, 0 0, 7 : Eu fluorescent lamp 95 91
• Example 3 (Ba, Sr) MgAl, 0 O, 7 : Eu PDP 90 88
• Example 4 (Ba ⁇ MgAl ⁇ O, 7 : Eu white LED 98 95
• the light emitting devices according to the respective examples have excellent luminance maintenance rates after 1000 hours and 5000 hours.
• the brightness of the light emitting device according to the comparative example is greatly reduced.
• a phosphor having an X-coordinate difference (A) and a y-coordinate difference (B) of 0.020 or less despite having the same composition as the comparative example has excellent characteristics. Is shown.
• the manufacturing method (inspection method) of the present invention it is possible to extract only phosphors with good characteristics.
• a phosphor (I) having an X coordinate difference (A) and a y coordinate difference (B) of both 0 ⁇ 020 or less and a phosphor (II) having both values of 0.025 were prepared.
• Phosphor (I) and phosphor (II) were mixed in the proportions (mass%) shown in Table 4 and applied to the light emitting devices. Then, according to the method described above, L / L
• any sample is (Ba Sr) MgAl O : Using Eu phosphor,
• the phosphor of the present invention and a light-emitting device using the phosphor have excellent lifetime characteristics. Moreover, according to the production method of the present invention, a phosphor and a light emitting device having excellent lifetime characteristics can be provided with good reproducibility. Therefore, the present invention is useful for various light emitting devices.

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• 2005
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