WO2004056939A1 - 発光体およびこれを用いた光デバイス - Google Patents
発光体およびこれを用いた光デバイス Download PDFInfo
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- WO2004056939A1 WO2004056939A1 PCT/JP2003/016379 JP0316379W WO2004056939A1 WO 2004056939 A1 WO2004056939 A1 WO 2004056939A1 JP 0316379 W JP0316379 W JP 0316379W WO 2004056939 A1 WO2004056939 A1 WO 2004056939A1
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- light
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- luminous body
- elements selected
- fluorescence lifetime
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- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7783—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals one of which being europium
- C09K11/77924—Aluminosilicates
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- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
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- C09K11/62—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing gallium, indium or thallium
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- C09K11/64—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing aluminium
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- C09K11/66—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing germanium, tin or lead
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- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
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- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7783—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals one of which being europium
- C09K11/7792—Aluminates
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- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
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- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7783—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals one of which being europium
- C09K11/7793—Germanates
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
Definitions
- the present invention relates to a luminous body having a long fluorescence lifetime and an optical device using the same, for example, a luminous body used for manufacturing optoelectronic solid components and compact energy saving lamps, and an optical device using the same.
- the present invention discloses a luminous body for a fluorescent lamp, which can be excited in both the short-wavelength ultraviolet spectrum region and the short-wavelength ultraviolet spectrum region and emits light in the visible spectrum region.
- a fluorescent lamp which can be excited in both the short-wavelength ultraviolet spectrum region and the short-wavelength ultraviolet spectrum region and emits light in the visible spectrum region.
- they are only known to date for use in fluorescent lamps and compact energy-saving lamps only.
- WO 9 8/1 2 7 5 7, WO 0 2/9 3 1 16 and U.S. Pat. No. 6,252,254 are increasingly used as color conversion materials for producing white light Discloses inorganic materials. However, they must correspond to the YAG light emission system mainly composed of yttrium aluminum garnet. In this illuminant type, the white light generated is a low color rendering type. For example, in the case of a combination of a blue LED and this yellow light illuminant, the color rendering index Ra is 70 to 77, The drawback is that it is color rendering type IIa.
- WO 00/33389 is that Yusuke also good characteristics of stimulated at a color wavelength of less than 500 nm, Ba 2 S i 0 4 having a maximum light emission at a color wavelength of 505 nm: describes the Eu 2+ luminous body system .
- WO 00/33390 discloses an illuminant mixture for an LED that produces a color temperature of 3000-6500 K with a simultaneous color rendering index Ra 83-87.
- the illuminant can be used as a mixture for producing colored light and Z or white light.
- All conventional illuminants used in LEDs have the disadvantage that they have poor temperature characteristics and poor temperature stability. This significantly reduces the effectiveness of the illuminant when operating the LED with increasing temperature.
- a shift in the energy distribution of light emission occurs, and a light color change occurs.
- a further disadvantage for certain applications is that the known phosphors used for LEDs, such as Ce-activated YAG phosphors made of barium magnesium aluminate and Eu-activated BAM phosphors, have a short fluorescence lifetime.
- Typical fluorescence lifetimes mainly for Ce and Eu activated illuminants, are a few microseconds. It can be maximal and have a fluorescence lifetime of a few milliseconds, which can be obtained, for example, by additional doping with manganese. It is an object of the present invention to provide a luminophore with improved temperature stability and an associated long fluorescence lifetime.
- an object of the present invention is to provide an optical device having excellent characteristics such as high light quality, power saving, and high luminance. Disclosure of the invention
- lanthanum La
- cerium Ce
- braseodymium Pr
- neodymium Nd
- samarium Sm
- gadolinium G d
- terbium Tb
- dysprosium Dy
- Ho holmium
- Er erbium
- Tm thulium
- Yb ytterbium
- Lu bismuth
- Bi tin
- An optical device having a wavelength converter including a luminous body that emits excitation light when excited based on light emitted from an LED element,
- the wavelength conversion section includes lanthanum (La), cerium (Ce), brassicae gym (Pr), neodymium (Nd), samarium (Sm), gadolinium (Gd), terbium ( Tb), Dysprosium (Dy), Holmium (Ho), Elpium (Er), Thulium (Tm), Ytterbium (Yb), Lutetium (Lu), Bismuth (Bi), Tin (Sn), Antimony (Sb) ) And similar substances are provided, comprising an illuminant comprising, as a further luminescence center, for improving the temperature stability, one or more coactivators selected from the group consisting of:
- a power supply unit for mounting the LED element and supplying power to the LED element; a light-transmitting sealing unit that integrally seals the LED element and the power supply unit; Excitation light is emitted based on the excitation light and emits excitation light.
- Excitation light is emitted based on the excitation light and emits excitation light.
- Sn antimony
- Sb antimony
- similar substances are characterized by having a wavelength conversion section including a luminous body containing as a further luminescence center for improving temperature stability one or more co-activators selected from the group. Is provided.
- LED lamps A light guide unit for guiding light emitted from the LED lamp
- lanthanum La
- cerium Ce
- Pr praseodymium
- Nd samarium
- Sm gadolinium
- Tb terbium
- Dy dysprosium
- Ho holmium
- Er erbium
- Tm thulium
- Tm ytterbium
- Lu lutetium
- Bi bismuth
- a wavelength conversion unit including a luminous body containing one or more co-activators selected from (S n), antimony (S b) and similar substances as a further luminescent center for improving temperature stability;
- FIG. 1 is a characteristic diagram showing a relationship between a relative intensity and a heating temperature according to the luminous body of the present invention.
- FIG. 2 is a characteristic diagram showing a relationship between a relative intensity and a light emitting spectrum according to the light emitting body of the present invention.
- FIG. 3 is a characteristic diagram showing the relative intensity of the light source when the excitation energy is switched off.
- FIG. 4 is a sectional view showing a light emitting device according to the first embodiment.
- FIG. 5 is a layer configuration diagram of the LED element according to the first embodiment.
- FIG. 6 is a layer configuration diagram showing another configuration of the LED element according to the first embodiment.
- FIG. 7 shows a light emitting device according to the second embodiment.
- (B) is a partially enlarged view of the LED element.
- FIG. 8 is a sectional view showing a light emitting device according to the third embodiment.
- FIG. 9 is a sectional view showing a light emitting device according to the fourth embodiment.
- FIG. 10 is a sectional view showing a light emitting device according to the fifth embodiment.
- FIG. 11 is a sectional view showing a light emitting device according to the sixth embodiment.
- FIG. 12 is a sectional view showing a liquid crystal backlight device as an optical device according to a seventh embodiment.
- Table 1 additionally shows some of the phosphors according to the invention having a long fluorescence lifetime, together with their relative emission concentrations at different temperatures.
- Raw materials in oxidized form or from materials that can be converted to oxides are mixed at the stoichiometric ratios indicated and, depending on the reaction conditions, in a corundum crucible in a reducing atmosphere of a nitrogen / hydrogen mixture. Calcinate for 4 hours at C. The final product is washed with water, dried and sieved. The resulting phosphor compound shows a maximum emission at a color wavelength of 487 nm and has a long fluorescence lifetime.
- the resulting mixture is calcined in a corundum crucible at 1245 ° C for 3 hours in a reducing atmosphere of a nitrogen-hydrogen mixture.
- the resulting calcined cake is crushed, washed with water, dried and sieved.
- the resulting phosphor compound shows a maximum emission at a color wavelength of 589 nm and has a long fluorescence lifetime.
- the raw materials are weighed at the stoichiometric ratio and mixed uniformly for several hours.
- the resulting mixture is placed in an oven at room temperature and calcined at 1220 ° C for 4 hours in a reducing atmosphere of a mixture of nitrogen and hydrogen.
- the calcined product obtained is ground, washed with water, dried and sieved.
- the resulting phosphor compound shows a maximum emission at a color wavelength of 509 nm and has a long fluorescence lifetime.
- the indicated ingredients are mixed in the above stoichiometric ratio.
- the resulting mixture is precalcined under reducing conditions at a temperature of 122 ° C.
- a second calcining process is performed at 1220 ° C in a reducing atmosphere of a nitrogen / hydrogen mixture. Secondary calcination for 2 hours gives a homogeneous final product, which is then washed with water, dried and sieved.
- the resulting phosphor compound shows a maximum emission at a color wavelength of 445 nm and has a long fluorescence lifetime.
- the raw materials are well mixed, they are subjected to a calcination process.
- the calcination process is carried out for 3 hours at 1225 ° C in a reducing atmosphere of a nitrogen / hydrogen mixture under the reaction conditions.
- the final product is ground, washed with water, dried and sieved.
- the resulting phosphor compound shows a maximum emission at a color wavelength of 543 nm and has a long fluorescence lifetime.
- the resulting mixture further containing A 1 F 3 as a flux is calcined at 1420 ° C. for 2 hours in a reducing atmosphere of a nitrogen / hydrogen mixture.
- the calcined product obtained is ground, washed several times with water, dried and sieved.
- the resulting phosphor compound shows a maximum emission at a color wavelength of 452 nm and has a long fluorescence lifetime.
- the relative emission intensity (relative intensity) of Mg 2 A 1 16 0 27 and 100K the relationship between the heating temperature in the range of ⁇ 900 K As shown in FIG.
- the relative intensity of the phosphor is greater than 0.8 in the temperature range from 200 K to about 600 K.
- Table 8 line 1 the composition (B a 0. 15 S r 0. 8 Eu 0 .. 5) 4 A 1 12. 5 G a i. 49996 Dy o. QQ. . 4 S 1 o. . 5 ⁇ 25. .
- An illuminant with 75 is described. Its raw material is a B AC_ ⁇ 3, S r C_ ⁇ 3, Eu 2 0 3, A 1 2 0 3, Ga 2 ⁇ 3, S I_ ⁇ 2 ⁇ beauty Dy 2 0 3.
- the raw materials are mixed in stoichiometric ratio with boric acid as flux and ammonium chloride and calcined at 1420 for 2 hours in a reducing atmosphere of nitrogen / hydrogen mixture. Crush the calcined cake and After mixing, the calcination process is repeated. The final product is ground, washed with water, dried and sieved. The obtained compound shows a maximum emission at a color wavelength of 523 nm and has a long fluorescence lifetime.
- FIG. 2 shows a rainbow emission spectrum of the light source 1 not shown.
- Light source 1 is a light emitter
- the relative emission intensity (relative intensity) of the color at an ultraviolet wavelength of 380 nm is 0.04, the relative emission intensity of blue at a wavelength of 490 nm is 0.034, and the relative emission of green at a wavelength of 508 nm.
- the intensity is 0.02
- the relative emission intensity of yellow at a wavelength of 560 nm is 0.024
- the relative emission intensity of red at a wavelength of 610 nm is 0.02.
- the light source Even after the excitation energy of the light source 1 is switched off, the light source still emits yellow light having a relative emission intensity (relative intensity) of 0.0375 having a maximum emission at a color wavelength of 580 nm shown in FIG.
- lanthanum La
- cerium Ce
- Pr praseodymium
- Nd neodymium
- Sm samarium
- Gadolinium Gd
- Tb terbium
- Dy dysprosium
- Ho holmium
- Er erbium
- Tm thulium
- Tm ytterbium
- Lu bismuth
- Sn tin
- the co-activator provides more center in the illuminant and, in the case of LEDs, allows for a lower energy loss process that occurs in the illuminant itself at higher measurement operating temperatures.
- additional coactivators of interest in the phosphor, additional and Z or new recombination centers are formed.
- This additional activation has the advantage of increasing the fluorescence lifetime by seconds or minutes, up to several hours. This allows light sources of increasing importance, especially in applications working in safe and healthy light, to adapt to the conforming behavior of the human eye. Mixtures of these illuminants are suitable for achieving various times of fluorescence lifetime. According to the present invention, this makes it possible to change the color of the LED when the excitation of the illuminant is switched off.
- a further advantage of these additional and new centers is that electrons are trapped from the excited state mainly by these centers, which in principle allow radiative recombination with luminescent ions. Secondly, these electrons are not trapped by the killer center, the center where the excitation energy is wastedly converted to heat and emission loss occurs.
- a luminous body containing silicate monogermanate and having improved temperature stability and fluorescence lifetime by doping europium is provided by an empirical formula
- M is one or more elements selected from the group consisting of calcium (Ca), strontium (Sr), barium (Ba), and zinc (Zn);
- M is one or more elements selected from the group consisting of magnesium (Mg), cadmium (Cd), manganese (Mn), and beryllium (Be);
- R is at least one selected from the group consisting of La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Bi, Sn, and Sb Element of
- X is an ion selected from the group consisting of fluorine (F), chlorine (C 1), and bromine (Br) forces for balancing electric charges;
- An illuminant comprising an additional dopant corresponding to
- M ' is one or more elements selected from the group consisting of Sr, Ba, Ca, Mg, and Zn;
- R is at least one selected from the group consisting of La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Bi, Sn, and Sb 0 ⁇ 1, 0 ⁇ x ⁇ 0.5, and 0 ⁇ y ⁇ 0.5)
- M ' is one or more elements selected from the group consisting of Ba, Sr and Ca;
- M is one or more elements selected from the group consisting of lithium (Li), sodium (Na), potassium (K) and rubidium (Rb);
- M "" is Mg, Mn,
- R is one or more elements selected from the group consisting of La, Ce, Pr, Nd, Sm, Gd, Tb, Ho, Er, Tm, Yb, Lu, Bi, Sn and Sb And and
- ⁇ ′ is one or more elements selected from the group consisting of Ca S r Ba and Mg,
- R is one or more elements selected from the group consisting of La Ce Pr Nd Sm Gd Tb Dy Ho E r Tm Yb Lu B i Sn and Sb;
- the doping is performed with an additional dopant represented by
- these illuminants for example,
- An illuminant mixture comprising one or more of the silicate mono- and germanate illuminants according to the present invention and / or an illuminant mixture comprising one or more of the mono-aluminate mono-gallate illuminants according to the present invention comprises an LED and a compact. It is also suitable as a layer for improving the temperature stability and fluorescent life of an energy saving lamp.
- a further advantage is that the thermal energy provided by the chip itself when operating the LED allows electrons to be free from these centers and emit light simultaneously. In each case, the heat generated is effectively converted. This can improve the temperature stability of the illuminant, and is therefore advantageous for use as a luminescent element and also for use in specific LEDs that generate colored light and Z or white light. When operating the LED at an operating temperature of about 60 to 120 ° C, the effectiveness is improved as compared to conventional light emitters. In addition, the illuminant exhibits a longer fluorescence lifetime than conventional LED illuminants which typically exhibit a fluorescence lifetime in the microsecond range.
- the silicate monogermanate luminescent material is at the same time very suitable for emission from the blue spectrum region, as long as the orange-red spectrum region of the visible spectrum depends on its composition.
- the silicate monogermanate phosphor has a long fluorescence lifetime and at the same time a blue and / or blue wavelength in the range of 300-500 nm in order to obtain white light with a high degree of effectiveness.
- it is selected to be used as a conversion material for an ultraviolet excitation light source.
- a further advantage is that the freeness of electrons from these centers gives rise to excited states in addition to those normally present, and operating the excitation source increases its effectiveness with increasing temperature.
- This principle can be applied to light emitters that emit blue to red spectral regions.
- the silicate monogermanate phosphor when used alone or in combination with the aluminate monogallate luminous system or other phosphors, it has a long fluorescence lifetime due to excitation by blue and / or ultraviolet LEDs Colored light or white light can be obtained.
- Both germanium in the silicate lattice and gallium in the aluminate lattice cause slight lattice expansion, and in both cases the emitted light shifts slightly, affecting the fluorescence lifetime.
- the light thus obtained has remarkable high fluorescence lifetime, high temperature stability and high light quality.
- an optical device using the above-described light emitter will be described in detail.
- FIG. 4 is a sectional view showing a light emitting device according to the first embodiment of the present invention.
- This light-emitting device 1 is a wavelength conversion type light-emitting device 1 in which an LED element is mounted on a lead, and leads 2 and 3 that are wiring conductors, and a cap portion 4 provided on the lead 2 for accommodating an LED element.
- the LED element 6 adhered to the bottom 5 of the cup part 4, the wire 7 made of Au for electrically connecting the electrodes (not shown) of the LED element 6 to the leads 2 and 3, the LED element 6 and the wire 7 And a light-transmitting sealing resin 8 for sealing the cup portion 4, a light-emitting body 9 mixed with the sealing resin 8, light-transmitting leads 2 and 3, an LED element 6, and a wire 7 And a shell-shaped sealing resin 10 for integrally sealing the sealing resin 10.
- the leads 2 and 3 are made of copper or a copper alloy having excellent heat conductivity and conductivity.
- the cup part 4 provided on the lead 3 has a light exit side of the inner wall for enhancing light emission to the outside of the cup. Has a slope by enlarging.
- the LED element 6 is a GaN-based LED element that emits blue light having a wavelength of 460 nm, and is fixed to the bottom part 5 of the cup part 4 with an adhesive having light reflectivity.
- the sealing resin 8 is a silicone resin mixed with the luminous body 9, and seals the LED element 6 by being potted and injected into the cup portion 4.
- the luminous body 9 includes, in addition to a commonly used activator, lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), samarium (Sm), gadolinium (Gd). ), Terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), lutetium (Lu), bismuth (Bi), tin (S) n)
- One or more co-activators selected from antimony (Sb) and similar substances.
- the encapsulating resin 8 contains an additional dopant corresponding to the following empirical formula with respect to the phosphor containing silicate-germanate and doped with europium.
- ⁇ ' is one or more elements selected from the group consisting of calcium (Ca), strontium (Sr), barium (Ba) and zinc (Zn);
- M is one or more elements selected from the group consisting of magnesium (Mg), cadmium (Cd), manganese (Mn) and beryllium (Be);
- R is one or more elements selected from the group consisting of La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Bi, Sn and Sb Is
- X is an ion selected from the group consisting of fluorine (F), chlorine (C 1), and bromine (Br) for balancing electric charges;
- the luminous body 9 containing is mixed.
- the sealing resin 10 is made of an epoxy resin, and has a hemispherical optical shape on the light emission side by a casting mold method using a mold for forming a shell shape.
- FIG. 5 is a layer configuration diagram of the LED element 6.
- the LED element 6 includes a sapphire substrate 61, an A1N buffer layer 62 formed on a sapphire substrate 61, and a Si-doped n-type GaN cladding layer formed on the A1N buffer layer 62.
- the LED element 6 has a double hetero structure having MQW 64 as a light emitting layer, and each layer may include A1 as appropriate.
- a method for manufacturing the light emitting device 1 will be described. First, a lead frame having leads 2 and 3 is formed by punching a copper plate serving as a lead frame by press working. Further, the cup part 4 is formed on the lead 3 when forming the lead frame. Next, the LED element 6 is bonded and fixed in the cup portion 4 with an adhesive. Next, the pad electrode 68 of the LED element 6 and the lead 2, and the n-side electrode 69 and the lead 3 are electrically connected by the wire 7. 'Next, the LED element 6 is sealed by potting and injecting the silicon resin mixed with the luminous body 9 in advance into the power supply unit 4.
- leads 2 and 3 in which the LED elements 6 are sealed are inserted into a resin molding die.
- a shell-shaped sealing resin 10 is formed around the leads 2 and 3 by injecting an epoxy resin into the mold.
- leads 2 and 3 are cut from the lead frame.
- the cup 4 is sealed with a sealing resin 8 mixed with a luminous body 9 containing a co-activator in addition to the commonly used activator, improving the temperature stability of the luminous body However, it is possible to suppress the shift of the energy distribution of light emission and to stabilize the light color of the light emitted from the LED element 6.
- co-activator can increase the fluorescence lifetime by a few seconds or minutes, up to a few hours, making it particularly suitable for applications working in safe and healthy light, and suitable for human eyes It is possible to adapt to the behavior.
- fluorescence lifetimes of various times can be realized, so that when the excitation of the luminous body is switched off, the color of light emitted from the light emitting device 1 can be changed.
- the luminous body 9 and another luminous body can be used as the other luminous body.
- the other luminous body for example, YAG can be used.
- the luminous body 9 containing the additional dopant described above is mixed with the sealing resin 8 with respect to the luminous body containing caesium-germanate and doped with europium.
- the other illuminant 9 is an additional phosphor corresponding to the following empirical formula for an illuminant containing aluminate monogallate and doped with europium.
- M ' is one or more elements selected from the group consisting of Sr, Ba, Ca, Mg, and Zn;
- R is at least one element selected from the group consisting of La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Bi, Sn and Sb.
- an additional dopant corresponding to the following empirical formula was added to a luminous body containing an aluminate and doped with europium.
- M is one or more elements selected from the group consisting of Ba, Sr, and Ca; M "is one or more elements selected from the group consisting of lithium (L i), sodium (Na), potassium (K), and rubidium (Rb);
- M "" is Mg Mn
- R is one or more elements selected from the group consisting of LaCePrNdSmGdTbHoErTmYbLuBiSn and Sb;
- an additional dopant corresponding to the following empirical formula was added to a luminous body containing alkaline earth metal aluminate monogallate and doped with europium.
- M ' is one or more elements selected from the group consisting of CaSrBa and Mg,
- R is La Ce Pr Nd Sm Gd Tb Dy Ho E r Tm
- One or more elements selected from the group consisting of Yb Lu B i S n and S b; and
- a light reflection layer may be provided on the sapphire substrate 61 side of the MQW 64 in order to enhance the light radiation to the outside of the LED element 6.
- an A1 layer can be provided as a light reflection layer on the sapphire substrate 61.
- FIG. 6 is a layer configuration diagram showing another configuration of the LED element 6.
- This LED element 6 has a configuration in which a GaN substrate 70 is used as a substrate and the A1N buffer layer described in FIG. 5 is omitted.
- An LED element 6 formed by crystal-growing a GaN-based semiconductor layer on such a GaN substrate 70 can also be used.
- an LED element 6 using a substrate made of a material such as Si, SiC, and A1GaN may be used as a light source.
- FIG. 7 shows a light emitting device according to a second embodiment of the present invention, wherein (a) is a longitudinal sectional view and (b) is a partially enlarged view of an LED element. Note that the same reference numerals are given to portions corresponding to the respective portions of the first embodiment.
- This light-emitting device 1 uses a flip-chip type LED element 11 as a light source, and electrically connects the LED element 11 with the Au bumps 12A and 12B as shown in FIG. 7 (a).
- the submount 13 made of Si and the submount 13 Ag paste 14 which is a conductive adhesive electrically connected to the cup portion 15a of the lead 15A, a lead 15B electrically connected to the submount portion 13 via a wire, It has an element accommodating portion 15C provided on the lead 15A, and a light reflecting surface 15b provided on the element accommodating portion 15C and having an inclination.
- the LED element 11 has a light-transmitting sapphire substrate 110, an A1N buffer layer 111, an n-type GaN cladding layer 112, and three I-layers.
- MQW113 formed by alternately arranging nGaN well layers and two GaN barrier layers, p-type GaN cladding layer 114, p-type GaN contact layer 115, and p-type GaN by etching N-side electrode formed on n-type GaN cladding layer 112 exposed by removing contact layer 115, p-type GaN cladding layer 114, MQW 113, and part of n-type GaN cladding layer 112 And a p-side electrode 117 formed on the p-type GaN contact layer 115, which is fixed to the submount 13 so that the substrate side is disposed on the opening side of the cup 15a. .
- the submount 13 includes an n-side electrode 130 provided on the surface of the n-type semiconductor layer 134 and a p-type semiconductor layer 131 provided on a part of the n-type semiconductor layer 134, as shown in FIG. 7 (b). an n-side electrode 132 having a p-side electrode 132 provided on the p-type semiconductor layer 131 and an n-side electrode 133 provided on the bottom side of the n-type semiconductor layer 134, that is, on the junction side with the cup portion 15a. 130 is connected to the p-side electrode 117 of the LED element 11 via the Au bump 12A.
- the p-side electrode 132 is connected to the n-side electrode 116 of the LED element 11 via the Au bump 12B, and the wire 7 is connected thereto.
- the sealing resin 8 is mixed with the luminous body 9 described in the first embodiment, and is injected by potting into the cup part 15a so as to cover and seal the LED element 11 and the submount part 13. ing.
- the submount 13 is fixed in the cup 15a with the Ag paste 14.
- the LED element 11 is mounted via the Au bumps 12A and 12B, and the LED element 11 is bonded to the submount 13 by ultrasonic bonding.
- the p-side electrode 132 and the lead 15B are electrically connected by a wire.
- a sealing resin 8 is injected into the cup portion 15a so as to cover the LED element 11 and the submount portion 13, and is sealed.
- the sealing resin 10 is molded into a shell shape for the leads 15A and 15B in which the cup portion 15a is sealed in this way.
- the light emitting device 1 of the second embodiment described above in addition to the preferable effects of the first embodiment, light based on the light emission of the MQW 113 can be emitted from the sapphire substrate side, The takeout property is improved. It is also possible to provide the submount 13 with a protection function against static electricity. In this case, the destruction of the LED element 11 due to static electricity can be prevented.
- FIG. 8 is a sectional view showing a light emitting device according to a third embodiment of the present invention.
- the light-emitting device 1 has a cap-shaped light-emitting layer 18 made of a resin material such as epoxy containing the light-emitting body 9 described in the first and second embodiments on the surface of a shell-shaped sealing resin 10.
- the light emitting body 9 is omitted from the sealing resin 8 for sealing the cup portion 15a.
- the luminous body 9 is not deposited around the LED element 11, so that The external radiation efficiency can be prevented from lowering due to the light absorption of the phosphor.
- the light efficiently guided to the surface of the sealing resin 10 can be wavelength-converted by the light-emitting layer 18 and externally radiated, and the wavelength conversion type light-emitting device 1 with high luminance can be obtained.
- FIG. 9 is a sectional view showing a light emitting device according to a fourth embodiment of the present invention. Note that the same reference numerals are given to portions corresponding to the respective portions of the first to third embodiments.
- This light-emitting device 1 is a surface-mount type wavelength-converting light-emitting device 1, which includes an LED element 11 and a light-emitting layer 18 that is excited based on light emitted from the LED element 11. It has a part 19, a main body 20 formed of a resin material such as acrylic, and a ceramic substrate 21 on which the LED element 11 is mounted.
- the wavelength conversion section 19 sandwiches the luminous body layer 18 composed of the luminous body 9 described in the first to third embodiments between two glass sheets composed of low melting point glass, and performs a heat treatment. It is integrated by applying. Specifically, the luminous body 9 is screen-printed on one surface of the first glass sheet, and the luminous body 9 is heated at 150 ° C. to remove the binder component to make a thin film. The first and second glass sheets are integrated by arranging a second glass sheet so as to sandwich the thinned luminescent layer 18 and performing heat treatment.
- the main body 20 has a light reflecting surface 15b inside, and has a light reflecting surface 15b for reflecting light emitted from the LED element 11 in the direction of the wavelength conversion unit 19, and has a light emitting surface.
- the wavelength conversion section 19 is formed so as to form the same plane as the surface.
- the space surrounded by the light reflecting surface 15b is filled with a silicone resin 16.
- the ceramic substrate 21 has wiring layers 21 A and 21 B which are copper foil patterns for bonding the LED elements 11 via Au bumps 12 A and 12 B on the surface. 21 A and 21 B are provided through the side surface of the ceramic substrate 21 to the back surface which is the bonding surface with the external circuit.
- the thin film light emitting layer 18 including the light emitting body 9 is sealed with glass. Therefore, the water resistance and moisture absorption resistance of the phosphor layer 18 are improved, and the light emitting device 1 having good wavelength conversion properties over a long period of time can be obtained.
- the luminous layer 18 is formed into a thin film based on screen printing and heat treatment, light absorption loss by the luminous layer 18 can be reduced, and a high-luminance wavelength conversion light-emitting device 1 can be realized. .
- the amount of the luminous body 9 used can be reduced by making the luminous body layer 18 thin, the cost of the light emitting device 1 can be reduced.
- FIG. 10 is a plan view showing a light emitting device according to a fifth embodiment of the present invention. Note that the same reference numerals are given to portions corresponding to the respective portions of the first to fourth embodiments.
- the light emitting device 1 includes a flip-chip type (0.3 ⁇ 0.3 mm) LED element 11, a submount section 13 made of A 1 N on which the LED element 11 is mounted, and a submount section 13. It seals the lead frames 22 A and 22 B to be joined, the £ 0 element 11 and the submount 13, and transmits the light emitted from the LED element 11 to the wavelength.
- the wavelength conversion section 19 is formed so as to have an optical shape for controlling light distribution of light emitted from the LED element 11, that is, has a dome shape.
- a light emitting layer 18 arranged at a predetermined interval.
- the submount 13 has wiring layers 21A and 21B made of copper foil on the surface, and fits into the steps 22a and 22b provided on the lead frames 22A and 22B. As a result, the wiring layers 21 A and 21 B are electrically connected to the lead frames 22 A and 22 B.
- the wavelength conversion section 19 forms an optical shape by hot-pressing the light-emitting body layer 18 sandwiched between the first and second glass sheets described in the fourth embodiment. . Further, the lead frames 22A and 22B are integrally sealed by heating the third glass sheet forming the glass sealing portion 23 at the same time as the heating press.
- the luminous body layer 18 is arranged with a space corresponding to the thickness of the glass sheet between the luminous body layer 18 and the LED element 11 with the deformation due to the heat treatment of the glass.
- the wavelength conversion section 19 has an optical shape, the LED element 11 Mixed light of the light emitted from the light source and the light whose wavelength has been converted by the light emitting layer 18 can be emitted to a desired range.
- the LED element 11 is sealed with glass to improve water resistance and moisture absorption, a high-intensity wavelength conversion light-emitting device 1 that is stable over a long period of time even under severe environmental conditions such as humid conditions. can get.
- FIG. 11 is a sectional view showing a light emitting device according to a sixth embodiment of the present invention. Note that the same reference numerals are given to portions corresponding to the respective portions of the first to fifth embodiments.
- This light emitting device 1 is different from the fifth embodiment in that lead layers 22 A and 22 B are replaced with wiring layers 24 A, 24 B, 25 A, and 25 B made of copper foil on both sides. Is used, the wiring layers 24 A and 25 A, and the wiring layer 24 B and 25 B are electrically connected by a through hole 26.
- the wiring layers 24A and 24B are electrically connected to flip-chip (l X lmm) LED elements 11 via Au bumps 12A and 12B.
- the wiring layers 24A and 24B are formed so as to have an area larger than the area to which the glass material constituting the wavelength converter 19 is bonded.
- the wavelength conversion section 19 is made of a copper foil provided on the surface of the ceramic substrate 21. Adhered to the wiring layers 24A and 24B, so that excellent adhesion between the wavelength converter 19 and the wiring layers 24A and 24B can be obtained based on the good adhesion between the glass material and the copper foil. . As a result, peeling of the wavelength conversion section 19 and moisture absorption inside the light emitting device 1 can be firmly prevented, and the wavelength conversion type light emitting device 1 having excellent reliability can be obtained.
- a light emitting device group formed collectively on the base substrate material can be easily cut out by cutting such as dicing and scribing.
- the light emitting device 1 is obtained.
- FIG. 12 is a sectional view showing a liquid crystal backlight device as an optical device according to a seventh embodiment of the present invention. Note that parts corresponding to the respective parts of the first to sixth embodiments are denoted by the same reference numerals.
- the liquid crystal backlight device 30 includes an LED lamp 31 serving as a light source, a light guide 32 for guiding light emitted from the LED lamp, and an LED lamp provided on the surface of the light guide 32. It has a luminous body layer 18 for wavelength-converting the light emitted from 31 and a liquid crystal panel 35 that is transmitted and illuminated from the back side based on the wavelength-converted light.
- the LED lamp 31 condenses blue light of wavelength 460 nm based on the light emission of the LED element composed of the GaN-based semiconductor layer in a shell-shaped resin sealing portion and radiates it to a predetermined irradiation range.
- the body 32 was reflected by the reflecting surface 32A, the bottom surface 32B, and the reflecting surface 32A, which reflected the light coming from the LED lamp 31 in a right angle direction, and was guided inside the light guide 32 by the reflecting surface 32A. It has an inclined surface 32 C on which light is incident, and a light reflecting layer 33 is provided on the bottom surface 32 B.
- the slope 32 C has La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, and Yb. , Lu, Bi, Sn, Sb.
- a luminous body layer 18 composed of a luminous body using one or more co-activators selected from a similar substance and a similar substance is provided in the form of a thin film.
- the liquid crystal panel 35 is formed by stacking, for example, a TFT (Thin Film Transistor) substrate, a liquid crystal layer, and a color filter substrate, and has a light transmissivity for transmitting light emitted from the light guide 32.
- a TFT Thin Film Transistor
- the radiated light of the LED lamp 31 is guided to the inclined surface 32C via the light guide 32, and the light emitting layer 18 provided on the inclined surface 32C forms the LED lamp 31.
- the emitted light is wavelength-converted into white light to illuminate the liquid crystal panel 35 by transmission.
- the light guided through the light guide 32 is used for the liquid crystal backlight device. Since the wavelength is converted by the luminous body layer 18 provided on the back side of the light device 30 for emission, good luminance can be obtained using blue light as a light source, and a transmitted illumination structure having a long fluorescent life can be realized. As a lighting device for a mobile phone or a device having a liquid crystal display unit, novel visibility can be provided.
- the fluorescent layer 18 has a long fluorescent life, power saving can be realized without deteriorating the light quality based on the combination with the light emission control of the LED lamp 31, and a device using a power source such as a battery is used. Can be used for a long time.
- the light emitted from the LED lamp 31 is reflected by the reflecting surface 32A to guide the light guide 32.
- the reflecting surface 32A may not be provided. it can.
- a light incident end surface perpendicular to the bottom surface 32B may be formed so that the light incident direction of the radiated light to the light guide 32 and the light guiding direction are the same. it can.
- the LED lamp 31 a lamp that emits ultraviolet light in addition to a lamp that emits blue light can be used. Industrial potential
- the present invention in addition to a commonly used activator, La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Due to the use of one or more co-activators selected from Lu, Bi, Sn, Sb and similar substances, The temperature stability of the illuminant is improved. Therefore, the shift of the energy distribution of light emission is less likely to occur, and the occurrence of light color change can be suppressed. Further, the fluorescence lifetime can be extended from the order of several microseconds to several seconds or several minutes.
Description
Claims
Priority Applications (5)
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JP2004562061A JP4102803B2 (ja) | 2002-12-20 | 2003-12-19 | 発光体およびこれを用いた光デバイス |
EP03780952A EP1577365A4 (en) | 2002-12-20 | 2003-12-19 | LUMINESCENT BODY AND OPTICAL DEVICE COMPRISING THE LUMINESCENT BODY |
US10/539,267 US7382033B2 (en) | 2002-12-20 | 2003-12-19 | Luminescent body and optical device including the same |
AU2003289463A AU2003289463A1 (en) | 2002-12-20 | 2003-12-19 | Luminescent body and optical device including the same |
CN2003801069358A CN1729268B (zh) | 2002-12-20 | 2003-12-19 | 发光体以及使用其的光学设备 |
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DE10259945A DE10259945A1 (de) | 2002-12-20 | 2002-12-20 | Leuchtstoffe mit verlängerter Fluoreszenzlebensdauer |
DE10259945.9 | 2002-12-20 |
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CN (3) | CN1729268B (ja) |
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- 2003-12-19 WO PCT/JP2003/016379 patent/WO2004056939A1/ja active Application Filing
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US7470926B2 (en) | 2004-09-09 | 2008-12-30 | Toyoda Gosei Co., Ltd | Solid-state optical device |
JP2006108621A (ja) * | 2004-09-09 | 2006-04-20 | Toyoda Gosei Co Ltd | 固体素子デバイス |
JP2006080317A (ja) * | 2004-09-09 | 2006-03-23 | Sumita Optical Glass Inc | 固体素子デバイス |
US7667223B2 (en) | 2004-09-09 | 2010-02-23 | Toyoda Gosei Co., Ltd. | Solid-state optical device |
JP2006111830A (ja) * | 2004-10-18 | 2006-04-27 | Toshiba Corp | 蛍光体,蛍光体の製造方法およびこれを用いた発光装置 |
JP2007242739A (ja) * | 2006-03-06 | 2007-09-20 | Sumitomo Metal Electronics Devices Inc | 発光素子収納用パッケージ |
JP2007258466A (ja) * | 2006-03-23 | 2007-10-04 | Sumita Optical Glass Inc | 照明装置及び発光装置 |
JP2009541521A (ja) * | 2006-06-21 | 2009-11-26 | テジュ エレクトロニック マテリアルズ カンパニー リミテッド | 白色発光ダイオード用ツリウム含有蛍光物質及びその製造方法 |
WO2007148880A1 (en) * | 2006-06-21 | 2007-12-27 | Daejoo Electronic Materials Co., Ltd. | Thulium-containing fluorescent substance for white light emitting diode and manufacturing method thereof |
US8119030B2 (en) | 2006-06-21 | 2012-02-21 | Daejoo Electronic Materials Co., Ltd. | Thulium-containing fluorescent substance for white light emitting diode and manufacturing method thereof |
US7875206B2 (en) | 2007-02-01 | 2011-01-25 | Kabushiki Kaisha Toshiba | Luminescent material |
US8062550B2 (en) | 2007-02-01 | 2011-11-22 | Kabushiki Kaisha Toshiba | Luminescent material |
JP2008258214A (ja) * | 2007-03-31 | 2008-10-23 | Sumitomo Metal Electronics Devices Inc | 発光素子実装用多層配線基板とその製造方法 |
JP2008193125A (ja) * | 2008-05-09 | 2008-08-21 | Toyoda Gosei Co Ltd | 発光装置の製造方法 |
JP2009135539A (ja) * | 2009-03-16 | 2009-06-18 | Toyoda Gosei Co Ltd | 固体素子デバイスの製造方法 |
WO2011078464A1 (en) * | 2009-12-21 | 2011-06-30 | Seoul Semiconductor Co., Ltd. | Strontium oxyorthosilicate phosphors having improved stability under a radiation load and resistance to atmospheric humidity |
US8173042B2 (en) | 2009-12-21 | 2012-05-08 | Seoul Semiconductor Co., Ltd. | Strontium oxyorthosilicate phosphors having improved stability under a radiation load and resistance to atmospheric humidity |
US8440106B2 (en) | 2009-12-21 | 2013-05-14 | Seoul Semiconductor Co., Ltd. | Strontium oxyorthosilicate phosphors having improved stability under a radiation load and resistance to atmospheric humidity |
US8963173B2 (en) | 2009-12-21 | 2015-02-24 | Seoul Semiconductor Co., Ltd. | Light emitting device having strontium oxyorthosilicate type phosphors |
Also Published As
Publication number | Publication date |
---|---|
CN101752492A (zh) | 2010-06-23 |
CN1729268B (zh) | 2012-12-19 |
JP4276255B2 (ja) | 2009-06-10 |
TWI331168B (ja) | 2010-10-01 |
JP4102803B2 (ja) | 2008-06-18 |
AU2003289463A1 (en) | 2004-07-14 |
US20060163683A1 (en) | 2006-07-27 |
KR100803852B1 (ko) | 2008-02-14 |
DE10259945A1 (de) | 2004-07-01 |
CN101220273B (zh) | 2012-05-30 |
JP2007169654A (ja) | 2007-07-05 |
US7382033B2 (en) | 2008-06-03 |
JPWO2004056939A1 (ja) | 2006-04-20 |
EP1577365A1 (en) | 2005-09-21 |
CN101220273A (zh) | 2008-07-16 |
EP1577365A4 (en) | 2009-04-01 |
CN101752492B (zh) | 2014-09-03 |
CN1729268A (zh) | 2006-02-01 |
KR20050109460A (ko) | 2005-11-21 |
TW200424286A (en) | 2004-11-16 |
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