TW201000603A - Light emitting device comprising a ceramic material with line emitter activators and an interference filter - Google Patents

Abstract

The invention relates to an improved light emitting device comprising a ceramic with line-emitting activators in optical contact with an interference filter. This light emitting device has a greatly increased light efficiency towards a preferred light-emitting direction.

Description

201000603 VI. Description of the Invention: TECHNICAL FIELD OF THE INVENTION The present invention relates to a light-emitting device, particularly an LED. [Prior Art] The present invention relates to a light-emitting device, particularly an LED such as a light-filled light-emitting diode (pcLED). It also relates to the use of such pCLEDs in light sources for LCD backlighting, automotive lighting, projection and signaling purposes. Currently used pcLED is a white pcLED or a place for lighting purposes.

Haoyue's full conversion pcLED. The latter is applied as a green and red light source, where the color point is the result of additive color mixing of the blue radiation emitted by the semiconductor, which is not emitted by the phosphor and the green to red emission of the phosphor screen excited by the blue LED light. absorb. This is because it is difficult to completely suppress the leakage of blue radiation through the fluorescent screen without sacrificing the total radiation efficiency of the light source. For this purpose, ceramic materials have been proposed, for example, in WO 2007/039849, which is incorporated herein by reference. However, for some applications, the illumination of prior art LEDs cannot be considered satisfactory. Therefore, there is a need for a light-emitting device that can provide an increased luminous distribution of satisfaction. SUMMARY OF THE INVENTION One object of the present invention is to provide a light-emitting device that can be used in an eyebrow and that provides a satisfactory increased illumination distribution. Solution E: Measure &&gt; The illuminating device of the first aspect of the present invention is determined. </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> </ RTI> At least one of &amp; 3+, Tb3+, Ho3+, and Mn4+ of the activator that emits light. The term "main" in particular means that &gt;9%, preferably three 95% and preferably 299% of the material have an ideal structure and/or composition. It should be understood that (depending on the sputum) some additives such as binders or fluxes may be present in the ceramic material. The cerium additive may be incorporated, in whole or in part, into the final material #, which may therefore also be a composite of several chemically distinct species and in particular such species known in the art as fluxing and/or binders. . Suitable fluxes and/or binders include alkaline earth metal oxides or alkali metal oxides (e.g., Mg oxime) and fluorides, SiO 2 and the like. In the sense of the present invention, "ceramic material" means, in particular, or a composite material having a controlled amount of pores or no pores. The term "polycrystalline material" in the sense of the present invention means, in particular, and/or that the package 3 has a material density greater than 9 % by weight of the main component, which consists of 80% of the single crystal B lifetime. Each of the single crystals has a diameter greater than (1) $ microns and may have a different crystallographic orientation (crystall〇graphic 〇 seven prices such as (10)). These early crystal domains may be joined by an amorphous material or a glassy material or by an additional crystalline component. Human "5" "optical contact" in the sense of the present invention particularly means and / or package 3 right-hand device, wherein the distance between the interference filter and the luminescent layer is such that the interference-free pattern is formed in the interference filter Between the device and the luminescent layer. This reduces the physical size of the device and unwanted light leakage. ,—Drying into a 'lighting man' especially means and/or including an optical component, J378J3 201000603 consists of a plurality of layers having alternating high and low refractive indices. The use of such a illuminating device which has been shown to be widely applicable in the present invention has at least one of the following advantages: due to the H of the activator included on the side and the interference filter on the other side The synergistic effect between 'can be found to greatly increase the luminescence towards one of the preferred directions; allowing the ceramic material to be used over a wide temperature range;

No transmission offset was observed (as observed in many applications including wideband transmitters). According to a preferred embodiment of the invention, the degree of doping of the activated core in the ceramic material is (4) 1% (mole·moule) and $25% (mole: m is preferably n% (mole: Moer) and training (Mor: Moer), the best is: Moer) W ear: Moer). In this paper, the degree of doping of the activator, which is not expressed by Mohr, is compared with the pottery material expressed by Mohr. According to one of the present inventions, 丨^ 2-. — "Pregnant and good example, the at least one interference filter comprises a filter 11 having a plurality of sub-layers. The number of sub-layers is preferably For (10) and; ^30,

The Hi sublayer has an average thickness of (10) nanometers and side nanometers, preferably 100 nanometers and $3 nanometers. Preferably, the material of at least one of the interference layers is selected such that the at least one interference layer comprises - alternating layers having a refractive index difference. According to a preferred embodiment of the present invention, the at least one selected from the group consisting of Ti〇2/Si〇2, Si〇2/Zn〇2〇3/ZnO &gt; Hf02/Si〇2. Hf〇2/Al203 An interference filter includes, Al2〇3/Ti〇2, 'Y2〇3/Ti〇2, 137813 201000603

A material of Zr〇2/Ti〇2 or a mixture thereof. Alternatively and/or additionally, the at least one interference filter comprises a plurality of layers substantially made of a resin, which may optionally comprise nanoparticles having a high refractive index material (preferably comprising ubiquinone) 2 and do not know). According to a preferred embodiment of the present invention, the ceramic material comprises a material selected from the group consisting of: -Ln203:Er 'Ln is selected from the group consisting of sc, γ, Gd, Lu, and the like. a group of -Ln203:Ho; -Ln203:Tb; and _, Ml is selected from the group consisting of a mixture of u, κ, 仏 or the like, Μ1! is selected from the group consisting of Si, Ge, Dingbu ☆, a group of wealth and its mixture; or a mixture thereof. The ceramic material preferably comprises a material that is substantially made of the material. However, in some applications, minor amounts of additives may also be present in the bulk composition. Such additives include, inter alia, such species known in the art as fluxing agents. Suitable fluxing agents include alkaline earth metal oxides or alkali metal oxides and fluorides, SiGe2, and the like, and mixtures thereof. According to a preferred embodiment of the invention, the at least one ceramic material has a refractive index of 21.4 Å, preferably d.7, and preferably n, which has been shown to be advantageous for many applications within the invention. The surprising finding is that for many applications, the refractive index can be automatically changed with the composition of the ceramic material, so that the ceramic (four) material matches the other components of the illuminating device with a "Folding»37813 201000603 radiance" in many The situation is possible. According to a preferred embodiment of the present invention, the photothermal stability of the ceramic material is 280 after exposure of the ceramic material at 20 crc for 1000 hours at an optical power density of 10 W/cm 2 and an average light energy of 2.75 eV. % to y0〇%. The term "photothermal stability" in the sense of the present invention means, in particular, and/or. The inclusion of a specific absorption characteristic under simultaneous application of heat and high-intensity excitation, that is, a 100% photothermal stability indicates the fact of the material. It is not affected by the simultaneous S-shot and heating. (, ' According to a preferred embodiment of the present invention, after exposing the ceramic material to an underlying light energy density of 1 〇 w/cm 2 and an average light energy of 2.75 eV for 1000 hours, the ceramic The photothermal stability of the material is from 82.5% to $95%, preferably &gt; 85% to $97%. According to a preferred embodiment of the invention, the thermal conductivity of the ceramic material at room temperature is 20.005 Wcrr^iC1 Up to $0.75 Wcm·丨1C1. According to one embodiment of the invention, the ceramic material exhibits a normal incidence in air of 210% to 5°/ for light having a wavelength range of 650 nm to $800 nm on u. Transparency. For light with a wavelength range from 2550 nm to $1 nm, the normal incidence of incidence in air is preferably 3〇% to 3〇% for wavelengths ranging from 2650 nm to S800. The light of the nanometer is preferably &gt;3〇% to 5% and optimally &gt;40°/. to &lt;70%. The term "transparency" in the sense of the present invention means especially for in the air. Normal incidence, can not be absorbed by the material at one wavelength of incident light - 乂佳佳 > 20 / 〇, better 230%, best 240% and $ 85 Transmitted through 137813 201000603 over αα. For red and green ceramic materials, this wavelength is preferably within the range of Μ70 nm and $8〇〇Ny or y1〇Nano and $57〇N. The preferred embodiment of the present invention has a theoretical density of 395% and density. According to a preferred embodiment of the invention, the ceramic material has a theoretical density of 297°/. and a density of $100%. The density of less than 丨〇〇% according to the preferred embodiment of the invention described above is obtained by sintering the material into a stage in which holes are still present in the ceramic matrix. The density is in the range of &gt;98% and 99%. The total pore volume in the ceramic matrix is in the range of 20.2% to £2%. A preferred average pore size is in y〇〇n. Further, the present invention relates to a method for producing a material for use in the ceramic material of the light-emitting device according to the present invention, and the method includes a sintering step. In the sense of the invention, it means especially in the heat The densification of a precursor powder can be combined with the application of a one-way dust force or an equal pressure in a liquid state that does not reach the main component of the sintered crucible. According to an embodiment of the present invention, There is no additional pressure in the sintering step, and the owner is in a reducing atmosphere or an inert atmosphere. According to an embodiment of the invention, the method further comprises the steps of: pressurizing the (etc.) precursor material prior to sintering. To achieve a desired density of β〇% to g〇%, according to an embodiment of the invention, it reaches its ideal density of *37813 201000603 255% to $60%. This has been shown in practice to improve the sintering step of most of the materials described herein. A method for fabricating a material for a light-emitting device according to the present invention includes the following steps: (a) mixing the precursor material of the material; (b) selectively firing the precursors The material is preferably at a temperature of from 1 to S150 (TC to remove volatile materials; (c) selectively ground and washed; (d) - a first pressurizing step, preferably one at kN a one-way pressurization step using a suitable powder compacting tool having a mold of a desired shape (e.g., rod or pellet); and/or a cold isostatic pressing step, preferably from 23,000 to $3,500 bar (e) - a sintering step, which is carried out in the art (8) to no additional pressure; (f) a hot pressurization step, preferably a hot isostatic pressing step, preferably At / &gt; 100 bar to $2500 bar and preferably at 25 〇〇. (3 to S2000 ° C temperature; and / or a hot one-way pressurization step, preferably in &gt; 1 〇〇巴至^25 〇〇巴 and preferably at a temperature of from 2500 ° C to S 2000 ° C; (g) a post-annealing step (as appropriate) in an inert atmosphere or air at &gt; 500 ° C to Furthermore, the invention relates to a light-emitting device, in particular to an LED comprising a ceramic material according to the invention. A compound according to the invention and/or a ceramic material can be used in many systems and/or In the application 'One of the following or more: 137813 -9- 201000603 - office lighting system; home system; - store lighting system; - home lighting system; accent lighting system, - spotlighting system; - Theater lighting system; 'Fiber application system; 'Projection system; 'Self-illuminated display system; • Pixelated display system; &quot; Segmented display system; &quot; Warning sign system; - Medical lighting application system; - Indicator system; And - decorative lighting systems; - portable systems; 'automobile applications; - greenhouse lighting systems; ' advertising lighting systems. The above ingredients, and the claimed ingredients and the ingredients used in accordance with the invention according to the implementation, the size , shape, compound selection and technical concepts without any special exception restrictions, making it applicable The selection criteria are known in the art without limitation. 137813 201000603 [Embodiment] Additional details, features, features and advantages of the present invention are disclosed in the description of the present invention. Several embodiments and examples of the illumination device of the present invention.

EXAMPLE I Preparation according to one of the first examples of the invention, lED: Y2〇3: Ho was prepared by mixing and firing techniques. These oxides are mixed in the yeast and dried under the war. The heating was carried out at 00 C over a period of 3 hours. The gr concentration is 1 mol% (relative to γ). The synthesized powder was ball milled for 24 hours using a Zr〇2 ball in isopropanol as a liquid medium over a period of 24 hours. After drying, the material was heat treated for 8 hours in air. Alternatively, deposition techniques that result in much smaller primary phosphor particles can be used to avoid time consuming grinding steps. The prepared powder was sintered to a transparent ceramic change by a heat pressurization process of '150 TC for 4 hours in an Ar atmosphere.

This step can also be carried out by adding a flux such as LiF, which is preferably between 0.01 and 5%. A sample having a size of 1 χ 1 χ 0·5 mm 3 was cut from the ingot, and all sides thereof were polished and placed on an LED wafer having a size of lxl mm 2 and emitted at 44 Å. The thickness of the sample was chosen such that there was almost no blue light leakage (less than 2%). Turning on the LED causes green light. An interference filter (consisting of 20 alternating Si〇2 and Ti〇2 layers) was applied on top of the transparent ceramic phosphor layer, resulting in an increase in light intensity in the forward direction of more than a factor of 1.7. 137813 11 201000603 Comparative Example i: As a comparative example, an LED is prepared which comprises the same thickness and h〇3+ concentration as the example of the invention - Y2〇3:H〇 (particle size 2 microns to 8 micron) powder layer. However, the application of the led according to the comparative example I did not cause the efficiency to produce green light. Almost no blue and green light exits the powder layer in the forward direction, and most of the light is reflected back to the LED and is lost due to scattering in unwanted directions and absorption in the LED and fill layer.

Comparative Example II As another comparative example, in a manner similar to the example of the present invention, the phosphor material is composed of YAG:Ce (wideband emission). A sample of -1 X1X0.5 mms was applied to a blue-emitting coffee (transmitting 440 nm). Adjust the thickness and concentration to obtain blue light through the ceramic change: a transmission of about 2%. Turning on the LED causes yellow light. Above the top of the transparent ceramic phosphor layer = the light intensity in the forward direction is two:: and two: the optical enhancement of the inventive example 1 which makes the LED of the present invention for the moon in the forward direction This is especially useful. It is necessary and/or advantageous to increase the redundancy in the above, and it is also observed that the portion of the emission spectrum when the introduction of the interference irradiator is blue-shifted, approximately the effect of any (4) according to the present invention: water. It is another advantage of the present invention. Less than $, it is recognized

Inventive Example H 137813 -12· 201000603 LTiF6 doped with Mn4+ (5 mol%) is made by hydrogen in a hydrofluoric acid resistant vessel made of, for example, Teflon during heating and sintering. The oxide is prepared by dissolving in dilute hydrofluoric acid (3% to 5% by weight). The luminescent material is isolated by evaporation of the reaction mixture to receive a dry powder. The 6-G phosphor system was ground as described above. A ceramic layer is prepared by heat-pressing at a temperature of TC for 20 hours at 100 MPa for 24 hours.

The application of the transparent ceramic stone dance "body layer" on top of one of the interferences, resulting in an increase in light intensity in the forward direction of about 1.6. The specific combinations of the elements and features in the above detailed description are merely exemplary; and the teachings are to be interpreted as being interchangeable with other teachings herein and in the patents/applications incorporated by reference. Alternative. As understood by those skilled in the art, the spirit and scope of the claimed invention are not deviated from the following: 1 The person skilled in the art can think about the changes, modifications, and implementations of the contents described herein. Therefore, the previous p, +, and unrecognized gentlemen &amp; descriptions are for illustrative purposes only and are not intended to be limiting. The scope of the invention is defined by the term "moon clothing" and its equivalent. In addition, in this description and in the request

Afr ± PM. ^ Multiple test symbols are not restricted

The scope of the claimed invention. J 137813

Claims (1)

201000603 VII. Patent application scope: 1. 2. 3. A illuminating device consisting of 5 small ones and eight ones mainly composed of ceramic material and at least Gans: 'The dry (four) optical device is in optical contact with the ceramic (four) material, 'The Tao Jing material is included as a light for emission At least one of 活化3+, Tb+, H〇3+, and Mn4+ of the activator. The activity % (mole: mole) and &lt; 25% (mole: the light-emitting device of claim 1 , the doping degree of the chemical agent is 20.01 mol) in the ceramic material. For example, in the case of any one of the items 1 to 2, the apricot is provided, wherein the ceramic material comprises a material selected from the group consisting of: Ln2〇3: Er 'Ln Is selected from the group consisting of a mixture of Sc, γ, 、, &amp; and the like; Ln203: Ho; Ln203: Tb; M 2M F6: Mn 'Mi is selected from the group consisting of a mixture of u, κ, Na or the like, and M11 is selected from the group consisting of Si, Ge, Ti 'Zr, Hf, and the like; mixture. 4. The illuminating device of any one of claims 1 to 3, wherein the at least one ceramic material has a refractive index of 21.4. 5. The illuminating device according to any one of claims 1 to 4, wherein the ceramic material is exposed to 1000 at a light power density of 1 〇W/cm 2 and an average light energy of 2.75 eV. After a while, the photothermal stability of the ceramic material was &gt; 80% to 00%. The illuminating device of any one of claims 1 to 5, wherein the ceramic material has a thermal conductivity of 20.005 W crn^K-1 to $0.75 W cm-ifT1. 7. The illuminating device of any of claims 1 to 6, wherein the ceramic material has a density of 295% and 5101% of the theoretical density. 8. A system comprising a lighting device according to any one of claims 1 to 7, the system being used in one or more of the following applications: office lighting system; home system; store lighting system; home lighting System; key lighting system; spotlighting system; theater lighting system; fiber optic application system; projection system; self-illumination display system; pixelated display system; segment display system; warning standard system, medical lighting application system; Signs, systems, and decorative lighting systems; portable systems; automotive applications; 137813 201000603 greenhouse lighting systems; advertising lighting systems. 137813. 201000603 IV. Designation of representative drawings: (1) The representative representative of the case is: (none) (2) The symbol of the symbol of the representative figure is simple: 5. If there is a chemical formula in this case, please disclose the chemical formula that best shows the characteristics of the invention. : (none) 137813