TW200534504A - 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 ligard field of the crystal.

Description

200534504 V. Description of the invention (1) [Technical field to which the invention belongs] The present invention relates to a white light emitting device and a manufacturing method thereof. The invention uses a light emitting light source and a powder with fluorescent characteristics to produce high brightness white light. A light source that emits ultraviolet light is used as the excitation light source to excite the first powder to emit blue-green light and excite the second powder to emit orange light. The blue-green light and the orange light can use the complementary color principle to generate white light. [Prior technology] Light \ Blue to white Sense White light is a multi-color mixed light that can be perceived by the human eye as white and includes mixed light of more than two wavelengths. For example, when the human eye is stimulated by red and green light at the same time, or when it is stimulated by blue and yellow light at the same time, it is treated as white light. Therefore, a white light emitting device can be manufactured according to this principle. The conventional white light emitting device has various manufacturing methods, and a simple method is to use a diode ^: 苐 diode made of InGaAlP, GaN, and GaN to control the current through the light emitting diode to emit red light and blue light. . Because these three crystal grains are placed in the same light bulb (lafflp), the green light and the emitted light can be mixed to produce white light. The first method is to use GaN and GaP as the two light emitters, and also control the current passing through the light emitting diodes to emit the light to produce white light. At present, the luminous efficiency of these two methods can reach 2 green light 1 m / W. However, these two methods have some disadvantages, that is, if one of these simultaneous use of color light emitting diodes fails, you will not get positive = same light. And because their forward biases are different, it requires more than one set of control electronics, which is often costly, which is a disadvantage in practical applications. ‘欸 使 The third is Nich.

200534504 V. Description of the invention (2) Chemical) The light efficiency of yttrium aluminum garnet issued by the present (only one set of light is required plus the matched product to present light, and its mixed light source is not only the light source, but also the light source will be extremely high. The efficiency of using the multi-purpose excitation wavelength is also a disadvantage of the type of material. It is only necessary to propose a source. The second spectral wave will be uniform after the wave, which is only suitable for polar bodies. The absorption of light can be obtained as much as possible, causing the inventor to break through the use of only one. The indium gallium nitride blue light-emitting diode with human hair-emitting fluorescent powder can also be a white light source. (Up to 20 lm / W) Although it is slightly lower than the previous two methods, / a polar chip can be used, which greatly reduces the manufacturing cost. Fluorescent powder modulation technology has matured, so there are currently ^ and the third method Both use the principle of complementary colors to produce white-length distributions that are less contiguous than real sunlight. Therefore, the appearance of color in the visible spectral range (400 nm ~ 700 nm) results in lower color saturation. The white produced by these methods is used as simple Lighting applications. At present, ultraviolet light has been developed to excite conventional fluorescent powders that can produce white light, which is not bright (that is, to replace fluorescent lamps or light bulbs), and this ultraviolet light ^ saves electricity. Conventional white light sources are produced during the production process. Generally, three or more fluorescent powders are used. For the powder to emit fluorescence at the same time, one of the prerequisites is that the phosphor can be absorbed by these fluorescent powders, and the yield coefficient of each phosphor cannot be too different, together with the quantum proximity of light energy conversion. It is better, so that it is easy to mix the three primary color phosphors to white light. The above factors greatly limit the difficulty of selecting fluorescent materials for the applicable labor materials. Special submersible research and scientific application, in order to reduce the difficulty of production in view of the limitations of the conventional technologies mentioned above, two types of fluorescent powder and a light-emitting diode are used as excitation light and white-light emitting devices.

Page 9 200534504 V. Description of the invention (3) [Summary of the invention] According to the present invention, it can emit ultraviolet light to excite the main powder, which can receive purple light. The two kinds of emitted light and color principle are used to stimulate the above-mentioned fluorescent light The first fluorescent powder 17, wherein the metal light having a sub-radius of 0 < χ $ is blue-green light. Fluorescent powder with red light (: [Embodiment] The traditional fluorescent powder with light as the activation center, the color of fluorescent light. However, the same, in order to improve this method and the method of 'light powder', it can be clearly understood One of the first two human body powders that emits light outside the light wavelength, instead of this body, a method for manufacturing a white light emitting device, which provides a photodiode and a first fluorescent powder that can be subjected to ultraviolet radiation from 470nm to 500nm. The blue-green light and a second fluorescent light are excited to generate an appropriate ratio of orange powder with a main wavelength of 570 nm to 600 nm, so that the ultraviolet light emitted by the two fluorescent powder polar bodies can be mixed to achieve optical quality. The mixed white light vision. All are powders that can be directly excited by ultraviolet light, and the chemical formula is preferably (Ba ^ -yEuxSry) MgAl 1Q0 〇 $ 1. The first fluorescent powder has a different ion to change its luminescence. The wavelength of the fluorescent powder, the second fluorescent powder emitted is a kind of orange light or orange. Its chemical formula is preferably αα, Ειι, ΜηχΡΟ ^ There are many ways to change the color to add or dope two different ions at the same time. , You can get one that can issue two at the same time Adjust the ratio of these fluorescent centers to obtain different colors, and the excitation wavelengths required for most foreign ions are inexhaustible. The feasibility is not as high as expected. The above disadvantages provide a white light emission. Device The white light emitting device includes a light emitting source and two second glorious fathers. The light emitted by the light emitting source is excited to generate a main wave.

Page 10 200534504 V. Description of the invention (4) One blue-green fluorescent light with a long range of 47 Onm to 50 Onm; and a second fluorescent powder, which can be excited by the light emitted by the light source to generate the main Wavelength ^ One of orange fluorescent light with a range of 570n m to 600n m; the blue-green fluorescent light can be mixed with the orange fluorescent light to form white light. In order to make the blue phosphor of the first fluorescent powder (B ah ^ xSry) Mg A 1 1G0 a in the present invention shift blue, the light is mainly adjusted by using the metal ion radius of the host crystal to change the force of the lattice field. color. Eu2 ions whose 4f orbital domain is split into 〒δ / and ψ 5d orbital domain by spin-orbital coupling are affected by crystal field

Split. As shown in the first figure, metal ion doping with a smaller ionic radius = wide range " £ 1 ^ 1 ^) 1 ^ 8110001 will reduce the electron repulsive force, and 5 (1 orbital domain split, will shrink , And the energy difference from the lowest energy level of 5d to 4f after Eu 2 excitation is also increased, and the light emission wavelength is blue shifted. In the present invention, the traditional structure is replaced by Sr 2 ions (Bah-yEuxSry At = l1G. 17 ^ · Ba 2 ions in the powder, for substituted solid two, for the substitutional solid solution, the important factor affecting the heterodi = sub-doping / degree is the structure of the product and the main reactant The p and properties of the BaMgAl 1G〇. SrMgAl worm structure are symmetrical in the space group :: 3 / mmC ', and the Ba2 and Sr 2 ions in these crystals are both D3h pairs. The yarn can predict that the Sr2 ions in BaMgAliG〇 扃Excellent solubility in the body.

For ^: 2 ions, Sr 2 ions have a larger electron cloud expansion effect, which will cause red shift in the ^ 'length. Therefore, Ba2 + is gradually replaced with Sr 2 ions

The peaks of the 4f-5d transition of Eu2 ions will move from 450,000 (y = 0.00) to 480 nm (y = 0.85). · The second fluorescent powder (Ca, Eu,) (]? 〇4) / 1 of the present invention is acceptable.

200534504 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 nm to 500 nm) and orange light (570 nm to 600 nm). ), And then mix the mixing ratio of the two fluorescent powders to obtain a high-brightness white light-emitting diode. The following is an example of the present invention to illustrate the manufacturing process: A fluorescent powder with a formula of (BainEuxSrJMgAl 丨 ..., such as (Ba〇.425Eu〇.15Sr 〇.425) MgAl 10〇17 ^) can be used for the synthesis method. Solid-state reaction method, chemical synthesis method, such as citrate gel method, co-precipitation method, etc. A formula of (〇3, £ 11 ^ 11) (? 〇4) 3 (: 1) is synthesized, The synthesis method can use the solid-evil reaction method, chemical synthesis method such as the salt-like salt gel method, co-precipitation method, etc. As shown in the second figure, one of the above formulas is measured using ultraviolet light with a wavelength of 396 nm as the excitation source. (SrO, 85EuG.15) MgAl phosphor powder emission spectrum. From the spectrum, it can be known that (Sr usEuo.dMgAl phosphor powder can produce blue-green fluorescence. The emission spectrum data will be issued by the International Illumination Commission in 1931 The formula of the Chromaticity diagram (Commission Internationale de Γ Eclairage, CIE) is converted into the chromaticity coordinates represented by this phosphor in the third figure. As shown in the fourth figure. The excitation spectrum shows that (Ca, Eu, Mr0 (P04) β 1 fluorescent powder can be Excited by external light, and can emit orange light with a peak of 590. The emission spectrum data is based on the chromaticity coordinate chart (composed by the Commission Internationale de Γ Eclairage (CIE) in 1931) ( The formula of the Chromaticity diagram) is changed to the chromaticity coordinates represented by this phosphor in the fifth figure.

Page 12 200534504 V. Explanation of the invention (6) In the chromaticity coordinate diagram, draw a line connecting the two chromaticity coordinate points corresponding to the two fluorescent powders with a dashed line. It is found that the theoretical chromaticity mixed connection can pass the chromaticity diagram. The white area in the middle, which is based on the principle of color and light mixing, as shown in the sixth figure, when the optic nerve is simultaneously affected by the color represented by point A (SrG 85Eug 15) MgAl powder (in this example, blue-green) and point B, The color (in this example, orange) can produce a 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 wavelength (in this example, 36 nm) is used as an excitation light source, and is appropriately packaged. After that, a white light emitting device with good light emitting characteristics can be obtained by applying an appropriate current. In summary, the present invention is a rare product of invention creation, and has industrial applicability, novelty, and progress. It fully meets the requirements of the invention patent application. The application is submitted in accordance with the law. Zhunli to protect the rights of the inventor. However, the above is only the preferred and feasible embodiment of the present invention, which does not limit the patent scope of the present invention. Therefore, any equivalent structural changes made by using the description and illustrated contents of the present invention are similarly included in the present invention. Within the scope of the invention, Chen Ming was together.

200534504 Brief description of the diagram [Simplified description of the diagram] The first diagram is a schematic diagram of the division of the 5d domain of the divalent Eu ion by the lattice field. The second figure is the excitation and emission spectrum of (B a i _x-yE x xry) MgAl1Q017 (X 2 0.15; y = 0 ~ 0 · 8 5) sample. The third figure is a chromaticity coordinate diagram of (B a bu x-yE uxSry) MgAl1G017 (X 2 0.15; y = 0 ~ 0_ 8 5) sample. The fourth picture is an orange fluorescent powder (〇8 ^ 11, ^ 111) (? 04) 3 (: 1). The fifth picture is an orange fluorescent powder (〇8 ^ 11 ^ 11) (? 04) 3 (: 1. Chromaticity coordinates. The sixth figure shows the chromaticity coordinates of the two fluorescent powders respectively calculated from the emission spectra. The dotted line connected by the dots can pass the chromaticity. Coordinate plot of white light block.

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Claims (1)

200534504 6. Scope of patent application 1. A white light emitting device, comprising: a light emitting diode capable of emitting ultraviolet light; a first fluorescent powder, which is excited by the ultraviolet light emitted by the light emitting diode and is generated Blue-green fluorescence with a main wavelength range of 470 nm to 500 nm, and its chemical formula is (BamEuxSrPMgAl 10〇17, where 0 < x $ 1, OS 1; and a second fluorescent powder, which is subject to the light emission The ultraviolet light emitted by the diode is excited to generate orange fluorescent light with a main wavelength range of 5 7 0 nm to 6 0 nm. Its chemical formula is (Ca, Eu, Mn) (P04) 3C1; where the blue The green fluorescent light can be mixed with the orange fluorescent light into white light. 2. For example, the white light emitting device of the first scope of the patent application, wherein the ultraviolet light source is also generated by an electron beam or a plasma. 3. If the first scope of the patent application is applied In the white light emitting device, the first fluorescent powder and the second fluorescent powder are mixed, and the ultraviolet light source is used as an excitation light source, and the white light emitting device can be obtained by applying an electric current after being packaged. 4 · Rushen The white light emitting device of the first patent scope, The first battalion light powder is a metal powder with a different ion radius instead of a fluorescent powder that changes its light emission wavelength. 5 · / A kind of white light emitting device manufacturing method includes the following steps: providing / ultraviolet light source; synthesizing a first phosphor Light powder, which can be excited by the light emitted by the ultraviolet light source to produce a blue-green glory with a main wavelength range of 470 to 500 nm; Page 15 200534504 6. The scope of the patent application is to synthesize a second fluorescent powder that can be excited by the light emitted by the ultraviolet light source to generate an orange fluorescent light with a main wavelength range of 570 nm to 600 nm. And mixing the first fluorescent powder and the second fluorescent powder in a predetermined ratio. 6. The method for manufacturing a white light emitting device according to item 5 of the application, wherein the ultraviolet light source can be generated by a light emitting diode, an electron beam or a plasma. 7. The method for manufacturing a white light emitting device according to item 5 of the 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. 8. The method for manufacturing a white light emitting device according to item 5 of the scope of patent application, wherein the first fluorescent powder is a fluorescent powder having a different ionic radius instead of changing a light emitting wavelength. Page 16