TWI244772B - Apparatus for white led and method for the same - Google Patents

Abstract

The present invention discloses an apparatus and method for manufacturing a white light emitting diode (LED) using the powder with characteristics of fluorescence to achieve a high-luminosity white LED. The LED emitting the ultraviolet is a use for an excitation source, which is exciting a first powder with blue-green light, and a second powder with orange light. After that, a white light is produced by blending the blue-green and orange light with the principle of complementarity. For achieving the high-luminosity white LED, the invention adopts a suitable LED to be the excitation source with a suitable blending proportion. On the other hand, the implementation of the fluorescent powder with blue-green light can be modulated using a metal ion in host lattice to change the ligand field of the crystal.

Description

1244772 Luxury No. 5. Description of the invention (1) [The invention belongs to the invention that a light source cooperates with ultraviolet light to emit blue-green light, which stimulates the orange light to be corrected.

[Previously, white rarely included the thorny light of the light, so the method used in this method is divided into the three lights plus white light. One of the methods is to apply the first technique.] When you want to stimulate one, use the original white system to control the grains to mix the two methods. At present, this is not the same, so the above is the same. 9310292 Technical Field] Regarding a white light emitting device and a manufacturing method thereof, it is necessary to produce a high-brightness white light from a powder having a fluorescent property. The light source can be used as an excitation light source to excite the first powder to emit a second powder to emit orange light. The blue-green light uses the complementary color principle to produce white light. 〃 Multi-color mixed light that can be perceived by the human eye as a mixed light of the highest wavelength of white light. For example, when the human eye is stimulated by red, β, green or blue and yellow light at the same time, it can sense S as white, and a white light emitting device can be produced. There are various methods for making light-emitting devices, which are briefly described below: The first-three light-emitting diodes made of InGaAlP, GaN, and GaN emit red, green, and blue light through the current of the light-emitting diode. In the same light bulb (丨 amp), the lens will emit white light. The method uses two light-emitting diodes made of GaN and Gap. The light-emitting diode emits blue and yellow-green light to generate a luminous efficiency of 2.1 m / ¥. But these two points, that is, these different light-colored light-emitting diodes used at the same time will not be able to get normal white light. And because of its forward direction, multiple sets of control circuits are needed, resulting in higher costs, which are all favorable factors. It was only in 1996 that Nichia

Page 8 1244772 _ 皇 I 虎 93110292 Che Yueyue Amend ___ V. Description of the invention (2)

(Chemical) has developed an indium gallium nitride blue light-emitting diode with yellow light emission. The Jishao Garnet-type fluorescent powder can also become a white light source. Although the luminous efficiency of this method (up to 20 lm / W) is slightly lower than the previous two methods, it only needs one set of light-emitting monopolar chips, and the fluorescent powder modulation technology with a large amount has become two. With the third method, the continuity of the complementary color distribution is not as good as that of the actual solar spectral range (40 nm to 700 nm). The color saturation is low. The lighting applications produced by these methods have been developed. Fluorescent powder can produce white light, unlit lamp or light bulb), and the white light source used for this ultraviolet light is produced in order to increase the above fluorescent powder. And if one of the prerequisites to use the same is the selected radiation, and the quantum efficiency of each phosphor for this wavelength of light and light energy conversion can also be matched with the ratio of the three primary color fluorescent powders to obtain a suitable fluorescent The type of material caused the inventors to select the intensive research and match the shortcomings' Break through the limitations of the above-mentioned conventional technology is to use only two types of fluorescent powder combination-a technology to make a white light emitting device. In order to reduce manufacturing costs, coupled with the well-established technologies, there are currently products available. The first principle is to produce white light, which has a spectral wavelength of light, so the color light will be visible after mixing). The color unevenness appears, resulting in the & white light source is only suitable as a simple external light emitting diode. It is used in lighting (that is, it replaces solar diodes and has more power saving characteristics. To learn its color rendering, it is generally to use three or more fluorescent powders to make it emit fluorescence, and the light can be absorbed by these fluorescent powders. The absorption coefficients should not differ too much, and it is better to be close to each other, so that it is easy to get white light. The above factors are greatly limited ^ Difficulties in using fluorescent materials. Appropriate use of the science and technology, to reduce the difficulty of production , Just mention the light-emitting diode as the excitation light source

1244772 Case No. 5. Description of the invention (3) [Summary of the invention] According to the present invention, the light emitted by the ultraviolet light generates a white light with a main wavelength that can be excited by ultraviolet light. O < xS 1,0 metal substitution in light powder changes light. And the second powder, its chemistry [Embodiment] Traditional light is the activation center, light powder, and light. However, the feasibility of most of the methods is to improve the method, in which the body is capable of receiving the white light emitting device of the 93110292, in which a light-emitting diode and a first fluorescent powder are provided which are capable of receiving ultraviolet light. The blue-green light and a second fluorescent powder whose excitation is 47 ηπ1 to 500 nm generate orange light with a main wavelength of 570 nm to 600 nm. Blending—Appropriate proportions can mix the light emitted by two fluorescent powders with the ultraviolet light to achieve the principle of optical color mixing and stimulate people. All powders are powders that can be directly excited by ultraviolet light. Among them, The chemical formula is preferably (Bal_ ”Euxsry) MgA110 ~, which. The first fluorescent powder is a fluorescent powder having a light emitting wavelength with a different ion radius, and the light fluorescent powder emitted by the first fluorescent powder is a kind that can emit light. Orange f ▲ bucket, > & 〆 $ / first or orange-red fluorescent driver K series is (C a, Eu, Mn) (P 〇 4) 3 c 1. There are many ways to change the color tone at the same time Adding or doping two kinds of ions can get two kinds of active centers that can emit two at the same time, and the ratio of these activation centers can be adjusted at the first time; θ = fluorescence of the fluorescently divided foreign ions. The excitation wavelength required is 5 colors. It is not as high as expected. The same, so the above-mentioned disadvantages, the present invention provides a light-emitting / white-light emitting device including a light-emitting light: white light; light =; the light emitted by the light-emitting light source is excited, and ^ _ produces a main wave

Page 10, 1244772, Case No. 93110292, Amendment 5 、 Explanation of Invention (4) " ^-one blue-green fluorescent light with a length ranging from 470nm to 500nm; and a second glory body, which can be subject to the light emission The light emitted by the light source is excited to generate orange fluorescent light having a main wave hand Z of 570nm to 600nm; the blue-green fluorescent light can be mixed with the orange light to form white light. In order to make the blue wavelength shift of the main wavelength of the first fluorescent powder (B & χ Eu Sr) M g A 1! Q 0〗 7 in the present invention, the metal ion radius of the host lattice is mainly used to change the lattice field. The magnitude of the force is used to adjust the light color. The Eu2 + ion's 4f domain is split into 2FS / 2 and 2F? / 2 by the spin-orbital co-upHng; the 5d domain is split by the action of the crystal field. As shown in the first image of the knife, the doping of metal ions with a smaller ion radius into (Bai X yEu) MgAUu will result in a decrease in the repulsive force of the electron, and the 5d domain split will also shrink, and the lowest 5d domain after Eu2 + excitation The energy difference of the energy level back to 4f also increases, resulting in a blue shift in the emission wavelength. θ In the present invention, Sr2 + ions are used to replace Ba2 + ions in the η-color fluorescent powder of (Bai x yEUxSry) MgAl οn. For the substitutional solid solution (substitutional solid solution), the most important factor that affects the concentration of the ion-doped impurity is the difference between the structure of the product and the main reactant. The birth rate is BaMgAUn and 3 The space group symmetry of the 11 () 〇17 crystal structure is / mmc, and the tBa2 + ions and 2+ ions of these crystals are symmetrical. It can be predicted that 81 'ions in 68 ^ 1 crystals will be avoided in 11 () 〇17 crystals. With excellent solubility. Compared with Ba2 + ions, Sr2 + ions have a larger electron cloud expansion effect, which will cause a red shift in the emission wavelength. Therefore, as the 讦 2+ ion gradually replaces the ion, the peak of the 4f-5d transition of the EW ion will move from 45nm (y = 〇〇〇) to 48〇nn (y = 0.85). The second fluorescence of the present invention Light powder ^^ ribs such as ^ ⑼ ^ thought it could be

Page 11 1244772 _Case No. 93110292_Year Month and Day___ V. Description of the invention (5) Orange powder. The first and second fluorescent powders can be simultaneously excited by ultraviolet light of a selected wavelength to emit blue-green light (470 run to 500 nm) and orange light (570 to 600 nm), and then By mixing the mixing ratio of the two fluorescent powders, a high-brightness white light-emitting diode can be obtained. The following is an example of the present invention to illustrate the manufacturing process: Synthesis of a fluorescent powder with the formula (Bapx-yEUxSrpMgAUn, such as (Ba〇425 EuQ i5Sr〇usjMgAUn 'The synthesis method can use solid state reaction method, chemical synthesis method, Such as the citrate gel method, co-precipitation method, etc. A fluorescent powder with a formula of (〇8, £ 11,1111) (? 04) 3 () 1 can be synthesized. The synthesis method can use the solid state reaction method, Chemical synthesis methods, such as citrate gel method, co-precipitation method, etc. As shown in the second figure, one of the above formulas (Sr0.85EuG.15) MgAl1G017 fluorescence was measured using ultraviolet light with a wavelength of 39 6 nm as the excitation source. Powder emission spectrum. From the spectrum, it can be seen that the (SrG 85EuG 15) MgAl1G017 fluorescent powder can produce blue-green fluorescent light. The data of the emission spectrum is published by the Commission Internationale de 1 'Eel airage (CIE) in 1931. The formula of the developed Chromaticity diagram is converted into the chromaticity coordinates represented by this phosphor in the third diagram. As shown in the fourth diagram. The (Ca, Eu, Mn) (P04:) 3 C 1 fluorescent powder Excited by ultraviolet light, and can emit orange light with a peak of 590 nm. The emission spectrum data is based on the chromaticity coordinate chart prepared by the International Lighting Commission (Commission Internationale de 1 Ec1ai rage, CIE) in 1931 ( The formula of Chromaticity diagram) is converted into the chromaticity coordinates represented by this phosphor in the fifth figure.

Page 121244772 Case No. 93110292 Λ_η Revision V. Description of the Invention (6) ^^ In the chromaticity coordinate diagram, draw a line connecting the corresponding chromaticity coordinate points of the two fluorescent powders with a dashed line, and find that the theoretical chromatic light mixing The connection can pass the white area in the chromaticity coordinate chart, which is based on the principle of mixing light and color. As shown in the sixth figure, when the optic nerve is simultaneously received by the point A (SrQ85EuGi5) MgAliG0i7, the color field represented by the fluorescent powder. For example, blue-green) and the color represented by point B (in this example, orange) can produce white vision. Therefore, the two fluorescent powders obtained by the method of the present invention are mixed in an appropriate ratio, and an ultraviolet light emitting diode capable of emitting an appropriate wave (3 96 nm) is used as an excitation light source. With appropriate current, you can get a white light hair with good luminous properties. The meaning and production: using L hair is a rare thing to know about inventions and creations, and it requires advancement, which is fully in line with the rights of inventors who apply for obstacles to invention patents. . — Wei Ci ’s early patent in this case, to ensure that the above is only a better limit of the present invention, the scope of the patent of the present invention, so for example, the use of this hairpin; == this is the equivalent of structural changes, including the same reason to include The content of Yu Taiyue's book and illustrations is Chen Ming. Within the scope of the present invention, joint case number 93110292

1244772 Schematic illustration [Schematic description] The first diagram is a stereogram showing the 5d domain of a divalent Eu ion by the crystal field. μ The second graph is the excitation and emission spectra of (BaixyEUxSry) MgAl1 () 017 (X = 〇15; y = 〇 ~ 〇 8 5) samples. · The third graph is (called "£ 1 ^ 1 ^) Xinba 11〇0017 () (= 〇15; YA = 〇〜〇 8 5) Chromaticity coordinates of the sample. · Excitation and emission of orange fluorescent powder (Ca, Eu, Mn) (P〇4) 3C1 = five pictures are orange fluorescent powder (Ca, Eu, Mn) (P〇4) 3C1 The sixth figure of the chromaticity coordinate indicates that the two types of fluorescence coordinates calculated from the emission spectra are dotted lines connected by dots, which can pass through the white light of the chromaticity coordinate chart, block 0

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Claims (1)

1244772 --- 1 No. 93110292__Year Month Date ___ 6. Application for patent scope1. A white light emitting device, including a light emitting diode that emits ultraviolet light; a first fluorescent powder, subject to the The ultraviolet light emitted by the light-emitting diode is excited to generate a blue-green fluorescent light having a main wavelength range of 470 nm to 500 nm. Its chemical formula is (BaifyEUxSry) MgAl1 () 017, where 0 < χ $ 1,0 'y $ 1; and a second fluorescent powder, which is excited by the ultraviolet light emitted by the light-emitting diode, and generates an orange fluorescent light having a main wavelength ranging from 57 nm to 60 nm, and its chemical formula is (Ca , Eu, Mn) (P04) 3C1; wherein the blue-green fluorescent light and the orange fluorescent light can be mixed into white light. 2. The white light emitting device according to item 1 of the patent application scope, wherein the ultraviolet light source can also be generated by an electron beam or a plasma. 3. If the white light emitting device according to item 1 of the patent application scope, wherein the first fluorescent powder and the second fluorescent powder are mixed, and the ultraviolet light source is used as an excitation light source, and then the current is obtained after packaging, White light emitting device. 4. A method for manufacturing a white light emitting device, comprising the following steps: providing an ultraviolet light source; synthesizing a first fluorescent powder which can be excited by light emitted by the ultraviolet light source, and generates a main wavelength range of 47 () to 5 〇〇11111 one of the blue-green fluorescent light 'its chemical formula is (Bai_x y EUxSry) MgAl1 () 017, where 0 < x $ 1, 〇 ^ y ^ 1; ~ A second fluorescent powder is synthesized, which can be affected by the The light emitted by the ultraviolet light source is excited to generate an orange fluorescent light having a main wavelength range of 57 Onm to 60 Onm; Page 15 1244772 _Case No. 93Π0292_ Year Month Amendment_ VI. Patent application scope and mixing the first fluorescent powder and the second fluorescent powder in a predetermined ratio. 5. The method for manufacturing a white light emitting device according to item 4 of the application, wherein the ultraviolet light source can be generated by a light emitting diode, an electron beam or a plasma. 6. The method for manufacturing a white light emitting device according to item 4 of the patent application, wherein the method for synthesizing the first fluorescent powder and the second fluorescent powder may be a citric acid precipitation method and a co-precipitation method. Page 16