• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
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    • 专利摘要:
    LIGHT EXTRACTING SUBSTRATE FOR ORGANIC LIGHT EMITTING DIODE A light extracting substrate includes a glass substrate that has a first surface and a second surface. A first extraction region can be defined on and/or adjacent to the first surface. The first light extraction region includes nanoparticles. A second light extraction region can be defined over at least a portion of the second surface. The second light extraction region has a surface roughness of at least 10 nm.
    公开号:BR112013019679B1
    申请号:R112013019679-3
    申请日:2012-02-03
    公开日:2021-05-18
    发明作者:Songwei Lu
    申请人:Vitro Flat Glass Llc；
    IPC主号:
    专利说明:

    CROSS REFERENCE ON RELATED REQUEST
    [001] This application claims priority to US Provisional Application No. 61/440 588, filed February 8, 2011, hereby incorporated in its entirety by reference. BACKGROUND OF THE INVENTION Field of Invention
    [002] This invention relates generally to organic light-emitting diodes, solar or photovoltaic (PV) cells, daylight windows, and more specifically to a substrate that has increased light scattering for improved utilization of light. Technical Considerations
    [003] An organic light emitting diode (OLED) is a light emitting device that has an electroluminescent emitting layer that incorporates organic compounds. Organic compounds emit light in response to an electrical current. Typically, an emitting layer of organic semiconductor material is situated between two electrodes (an anode and a cathode). When electrical current passes between the anode and cathode, the organic material emits light. OLEDs are used in numerous applications, such as television screens, computer monitors, mobile phones, PDAs, watches, lighting and many other electronic devices.
    [004] OLEDs offer numerous advantages compared to conventional inorganic devices such as liquid crystal displays. For example, an OLED works without the need for a backlight. In low ambient light, such as in a dark room, an OLED display can achieve a higher contrast ratio than conventional liquid crystal displays. OLEDs are also thinner, lighter and more flexible than liquid crystal displays and other lighting devices. OLEDs also require less energy to function.
    [005] However, a disadvantage of OLED devices is that they typically emit less light per unit area than point light sources based on inorganic solid state. In a typical OLED lighting device, about 80% of the light emitted from the organic material is trapped inside the device due to the optical waveguide effect, in which light emitted from the organic emitting layer is reflected back from the interface of the emitting layer/organic conductive layer (anode), the interface of the conductive layer/substrate (anode) and the outer surface of the substrate. Only about 20% of the light emitted from the organic material escapes the optical waveguide effect and is emitted by the device. Therefore, it would be advantageous to provide a device and/or method for extracting more light from an OLED device than is possible with conventional methods.
    [006] Photovoltaic solar cells are in principle counterparts to light emitting diodes. Here, the semiconductor device absorbs light energy (photons) and converts that energy into electricity. Similar to OLEDs, the effectiveness of the photovoltaic device is relatively low. At the modular level, for example, only up to 20% of incident light is typically converted to electrical energy. In a class of photovoltaic devices, those consisting of thin-film PV cells, this effectiveness can be as low as 6-7%, depending on the semiconductor material and junction design. One way to increase the effectiveness of the photovoltaic device is to increase the fraction of sunlight that is absorbed near the junction of photovoltaic semiconductors. Thus, the present invention also finds use in the field of solar cells. SUMMARY OF THE INVENTION
    [007] A light extracting substrate comprises a glass substrate having a first surface and a second surface. The light extracting substrate comprises a first light extracting region and/or a second light extracting region. The first light extraction region, if present, is defined on and/or adjacent to the first surface. The first light extraction region can comprise nanoparticles embedded in the substrate at a distance from the first surface. The second light extraction region, if present, may be defined over at least a portion of the second surface. The second light extraction region can have a surface roughness of at least 10 nm.
    [008] A light extracting substrate comprises a glass substrate having a first surface and a second surface. A first light extraction region is defined on and/or adjacent to the first surface. The first light extraction region comprises nanoparticles embedded in the substrate at a distance from the first surface. A second light extraction region is defined over at least a portion of the second surface. The second light extraction region has a surface roughness of at least 10 nm.
    [009] A method for fabricating a light extracting substrate, such as a glass substrate having a first surface and a second surface, comprises forming a first light extracting region on and/or adjacent to the first surface. The first light extraction region is formed by heating the substrate to a temperature to soften the first surface and then directing or propelling the nanoparticles towards the first surface so that at least a portion of the nanoparticles penetrates the first surface. A second light extraction region is formed over at least a portion of the second surface. The second light extraction region can be, for example, a coating or a textured pattern. The second light extraction region has a surface roughness of at least 10 nm. BRIEF DESCRIPTION OF THE DRAWINGS
    [0010] Figure 1 is a side view, in section (not to scale), of an OLED device incorporating a substrate of the invention. DESCRIPTION OF PREFERRED MODALITIES
    [0011] As used herein, spatial or directional terms, such as "left", "right", "internal", "external", "above", "below" and the like, refer to the invention as shown in the figure of drawing. It should be understood, however, that the invention may take several alternative orientations and, therefore, such terms are not to be regarded as limiting. In addition, as used herein, all numbers expressing dimensions, physical characteristics, processing parameters, amounts of ingredients, reaction conditions, and the like, used in the report and claims, shall be understood to be modified in all instances by the term “approximately”. Therefore, unless otherwise indicated, the numerical values presented in the following report and in the claims may vary depending on the desired properties which the present invention seeks to obtain. At the very least, and not in an attempt to limit the application of the equivalents doctrine to the scope of the claims, each numerical value should at least be interpreted in light of the number of significant digits reported and by applying common rounding techniques. Furthermore, it should be understood that all ranges disclosed herein encompass the starting and ending range values and any and all sub-ranges grouped within them. For example, a stated range of “1 to 10” should be considered to include any and all sub-ranges between (and inclusive) the minimum value of 1 and the maximum value of 10; that is, all sub-ranges starting with a minimum value of 1 or more and a maximum value of 10 or less, such as 1 to 3.3, 4.7 to 7.5, 5.5 to 10 , and the like. In addition, all documents, such as, but not limited to, issued patents and patent applications, referred to herein are to be considered to be “incorporated by reference” in their entirety. Any reference to proportions, unless otherwise specified, is “in percent by weight”.
    [0012] For the purposes of the following discussion, the invention will be discussed with reference to a conventional OLED device. However, it should be understood that the invention is not restricted to use with OLED devices, but can be put into practice in other fields, such as, but not limited to, thin-film photovoltaic solar cells. For other uses, such as thin-film solar cells, the glass architecture described later in the report may have to be modified.
    [0013] Shown in Figure 1 is an OLED device 10 embodying the features of the invention. The OLED device 10 includes a cathode 12, an emitter layer 14 and an anode 18. However, unlike conventional OLED devices, the OLED device includes a substrate 20 that embodies the features of the invention.
    [0014] The structure and operation of a conventional OLED device will be well understood by those skilled in the art and therefore will not be described in detail. An exemplary OLED device is described in U.S. Patent No. 7,663,300. Cathode 12 can be any conventional OLED cathode. Examples of suitable cathodes include metals such as but not limited to barium and calcium. The cathode typically has a reduced operational function. Emitter layer 14 may be a conventional organic electroluminescent layer as known in the art. Examples of such materials include, but are not limited to, small molecules such as organometallic chelates (eg Alq3), fluorescent and phosphorescent dyes, and conjugated dendrimers. Examples of suitable materials include triphenylamine, perylene, rubrene and quinacridone. Alternatively, electroluminescent polymeric materials are also known. Examples of such conductive polymers include poly(p-phenylene vinylene) and polyfluorene. Phosphorescent materials can also be used. Examples of such materials include polymers such as poly(n-vinylcarbazole), in which an organometallic complex, such as an iridium complex, is added as a contaminant. Anode 18 can be a transparent, conductive material such as a metal oxide material such as, but not limited to, indium tin oxide (ITO) or aluminum coated zinc oxide (AZO). The anode typically has a high operational function.
    [0015] Unlike conventional OLED devices, the OLED device 10 is performed on a substrate 20 that embodies the features of the invention. Substrate 20 is a transparent substrate having a first surface 24 and a second surface 26. Examples of suitable materials for substrate 20 include, but are not limited to, glass, such as conventional soda lime silicate glass, as per example, float glass. Substrate 20 has high visible light transmission at a reference wavelength of 550 nanometers (nm) and a reference thickness of 3.2 nm. "High visible light transmission" means visible light transmission at 550 nm higher than or equal to 85%, such as higher than or equal to 87%, such as higher than or equal to 90%, such as higher than or equal to 91%, such as higher than or equal to 92%, such as higher than or equal to 93%, such as higher than or equal to 95%, at a reference thickness of 3.2 mm. Non-limiting examples of glass that can be used in the practice of the invention include, but are not limited to, Starphire®, Solarphire® PV and CLEAR™ glasses, all commercially available from PPG Industries, Inc. of Pittsburgh, Pennsylvania. The substrate 20 may have any desired thickness, such as in the range of 0.5mm to 10mm, such as 1mm to 10mm, such as 1mm to 4mm, such as 2mm to 3.2mm .
    [0016] The substrate 20 incorporates at least one of: (1) a first (e.g., an inner) layer or light extraction region 30; and/or (2) a second (e.g., outer) light extracting layer or region 32. The addition of light extracting regions to the substrate reduces the waveguide effect described above so that less light is reflected. back from the various interfaces, and less light is trapped inside the device. This allows more light to be emitted from the device. The first extraction region 30 is formed by nanoparticles embedded in the first surface 24 of substrate 20 or embedded in or embedded in the glass region adjacent to the first surface 24. Examples of suitable nanoparticles include, but are not limited to, oxide nanoparticles such as such as, but not limited to, alumina, titania, cerium oxide, zinc oxide, tin oxide, silica and zirconia. These oxide nanoparticles can be incorporated into substrate 20 at a depth in the range of 0 micron to 50 micron, such as 0 micron to 10 micron, such as 0 micron to 5 micron, such as 0 micron to 3 micron. The first surface 24 incorporating the first extraction region 30 may be smoother than the second surface 26. For example, the first surface 24 may have an average surface roughness (Rs) up to 100 nm, such as up to 50 nm, such as up to 20 nm, such as up to 10 nm, such as up to 5 nm, such as in the range of 1 nm to 10 nm, such as in the range of 1 nm to 50 nm, such as from 1 nm to 20 nm, such as from 1 nm to 10 nm, such as from 1 nm to 5 nm.
    [0017] The outer extraction region 32 can be formed by a coating, such as a metal oxide coating that has a rough outer surface. Examples of useful oxides for the outer extraction layer 32 include, but are not limited to, silica, alumina, zinc oxide, titania, zirconia, tin oxide, and mixtures thereof. The outer extraction layer 32 may have a surface average roughness (Rs) in the range from 5 nm to 500 nm, such as from 5 nm to 500 nm, such as from 50 nm to 500 nm, such as from 50 nm to 200 nm, such as from 100 nm to 200 nm and/or a root mean square roughness (Rq) in the range of 100 nm to 250 nm, such as from 150 nm to 200 nm. The coating may have a thickness in the range of 10 nm to 500 nm, such as 50 nm to 500 nm, such as 100 nm to 500 nm. The outer extraction layer 32 can be a single layer or optionally a multilayer coating.
    [0018] Alternatively, the outer extraction region 32 can be formed by texturing the second surface 26 of the glass rather than applying a separate coating layer. For example, the second surface 26 can be scored or cut to form a textured surface.
    [0019] The first extraction region 30 and the second extraction region 32 can provide the substrate 20 with haze in the range of 1% to 100%, such as 1% to 90%, such as 1% to 80%, such as as from 1% to 60%, such as from 1% to 50%, such as from 10% to 80%, such as from 10% to 40%, as measured by a conventional commercially available Haze-Gard Plus metering apparatus from BYK -Gardner.
    [0020] The operation of the OLED device 10 will now be described with specific reference to Figure 1.
    [0021] During operation, a voltage is applied across anode 18 and cathode 12. An electron current flows from cathode 12 to anode 18 through the emitting layer 14. The electrical current causes the emitting layer 14 to emit light . The substrate 20 of the invention provides increased light extraction compared to an OLED device without substrate 20. Electromagnetic radiation in the form of light waves emitted by emitting layer 14 travels through anode 18 into substrate 20 These light waves encounter the inner extraction layer 30 and become more dispersed, causing the light waves to travel more randomly across the substrate 20. When the light waves exit the substrate 20 at the second surface 26, the rough surface of the outer extraction layer 32 causes more dispersion of light waves. The combination of the scattering of the inner extraction layer 30 and the scattering of the extraction layer 32 increases the total light extraction for the OLED device 10 by decreasing the waveguide effect. While the above embodiment contemplates the presence of both the inner extraction layer 30 and the outer extraction layer 32, in other embodiments only one or the other of these layers needs to be present.
    [0022] An exemplary method for forming the substrate of the invention will now be described.
    [0023] In a float glass process, batched glass materials are melted in a furnace to form a glass casting. The glass casting is poured into a float chamber that has a molten metal bath, such as a molten tin bath. The molten glass spreads across the surface of the molten metal to form a glass ribbon. In one practice of the invention, a flame sputtering device or combustion deposition device is mounted in the float chamber above the glass ribbon. A suitable flame spraying device is commercially available from Beneq-O Vantaa, Finland. Another flame spraying device is described in WO 01/28941. In the flame spraying device, coating materials are atomized, subjected to combustion and then sprayed directly onto the hot float glass ribbon. Particles are formed on and/or diffused into the surface of the tape or penetrate the surface and are incorporated into the upper portion of the float glass tape. These particles, such as metal oxide nanoparticles, are present on the surface of the glass or are diffused into the glass and react with the glass matrix. This process can be carried out anywhere suitable in the float chamber, but it is believed to be more practical in places where the temperature of the float glass ribbon is in the range of 400°C to 1000°C, such as from 500°C to 900°C, such as from 500°C to 800°C, such as from 600°C to 800°C, such as from 700°C to 800°C. As the float tape leaves the float chamber, the glass has nanoparticles embedded in the surface of the glass sheet or embedded in the region of the glass adjacent to the top surface of the glass. These nanoparticles define the first extraction region 30. During the process of incorporating nanoparticles to the glass surface at an elevated temperature, the glass surface becomes uniform by softening at the elevated temperature. The glass can be heat treated or annealed in a conventional way.
    [0024] In a non-floating process, the substrate can be heated, such as in an oven, by a flame, or by another heat source, until the glass surface has softened. The nanoparticles can then be directed or propelled to the softened surface, such as by a conductive gas. As will be understood, substrate temperature is a factor in determining the extent of penetration of nanoparticles into the substrate. As will be understood, the lower the substrate viscosity, the greater the penetration of the nanoparticles. A suitable deposition process is described in U.S. Patent No. 7 851 016.
    [0025] After the inner extracting layer 30 has been formed (for example, after the glass has left the float chamber in the float glass process), the outer extracting layer 32 can be provided. For example, the outer extraction layer 32 can be formed by applying a coating, such as a metal oxide coating, on the surface of the glass opposite the surface that has the nanoparticles incorporated into it. This can be achieved in any conventional manner, such as by spray pyrolysis methods or conventional sol-gel methods, inside an annealing furnace, or at the annealing furnace outlet, where the temperature is in the range of 50° C to 600°C, such as from 100°C to 400°C, such as from 150°C to 350°C, such as from 200°C to 300°C. The resulting substrate thus incorporates both the first (i.e., inner) extraction layer 30 and the second (i.e., external) extraction layer 32. In the broad practice of the invention, however, it is necessary for only one of these extraction regions to be gift.
    [0026] As an additional step (either online or offline), a conductive metal oxide layer to form the anode can be applied in any conventional manner on the first surface 24 of the glass substrate 20. For example, a layer of indium tin oxide or aluminum coated zinc oxide can be applied by magnetron sputter vapor deposition, chemical vapor deposition or any other suitable method to form the anode. Anode 18 can be deposited before or after the deposition of the first extraction region 30 by an on-line process, or after the deposition of both the first extraction region 30 and the second extraction region 32. In addition, a coating stack Optional bottom layer (such as described in U.S. Publication Nos. 2010/0285290, 2010/0124642 or 2010/0124643) may be incorporated under anode 18 (i.e., between anode 18 and substrate 20) to increase the transmittance of the substrate 20 with the lower layer coating stack and the anode 18 and at least one of the inner extraction region 30 or the outer extraction region 32. The substrate 20 with the conductive anode 18 and at least one of the extraction region The inner 30 or outer extraction region 32 can then be supplied to an OLED manufacturer, who can then apply the emitting layer 14 and the cathode 12 to form an OLED incorporating the light extracting substrate 20.
    [0027] Examples of the invention will now be described. It should be understood, however, that the invention is not limited to these specific examples. EXAMPLES
    In the following Examples, the substrate (unless otherwise indicated) is Solarphire® glass, commercially available from PPG Industries Ohio, Inc., which has a thickness of 2 millimeters (mm). The haze and transmittance values are percentage values and were measured using a Haze-Gard Plus haze meter commercially available from BYK-Gardner, USA. Temperature values are in degrees Celsius (°C) and pressure values are in pounds per square inch (psi). EXAMPLE 1
    [0029] This Example shows a substrate with an outer extraction layer on one side. TEOS means tetraethyl orthosilicate; TPT stands for titanium isopropoxide; DI water means deionized water; and IPA means isopropyl alcohol.
    [0030] A first solution (shown in Table 1) and a second solution (shown in Table 2) were prepared. TPT was added to adjust the refractive index of the coating. TABLE 1 (SOLUTION 1)

    TABLE 2 (SOLUTION 2)

    [0031] These solutions were mixed in the proportions shown in Table 3 and Table 4 to form coating composition 1 (Table 3) and coating composition 2 (Table 4). TABLE 3 (COATING 1)
    TABLE 4 (COATING 2)

    [0032] The coating compositions were applied by spraying onto a surface of oven-heated glass substrates using a conventional spray coating device to form an outer extraction layer. As shown in Table 5, the resulting coatings provide the substrate with haze greater than 10 while maintaining greater than 90 percent transmittance. TABLE 5
    EXAMPLE 2
    [0033] This Example illustrates a substrate coated with an external extraction layer on one surface and an indium-tin oxide coating on an opposite surface. An indium tin oxide (ITO) coating was sputter deposited onto a first major surface of a glass substrate from an indium/tin cathode using a conventional magnetic sputter vapor deposition (MSVD) device. The ITO coating had a thickness of 300 nm. An external extraction layer was applied by conventional spray pyrolysis pyrolysis onto the second main surface of the glass substrate (opposite to the first main surface) using the coating compositions described above. Spray parameters and optical results are shown in Table 6. TABLE 6
    EXAMPLE 3
    [0034] (A) This Example illustrates a substrate with an external silane-based extraction layer. Coating composition H-Gard® HC 1080 (commercially available from PPG Industries Ohio, Inc.) was applied by spraying onto a surface of oven-heated glass substrates using a conventional spray coating device to form an outer extraction layer. . Spray parameters and optical measurements are shown in Table 7. The coated substrate had greater than 50 percent haze while maintaining greater than 87 percent transmittance. TABLE 7


    [0035] (B) An H-Gard® HC 1080 coating was applied by spraying to one side of a substrate as described above. A 300 nm indium tin oxide coating was sputter deposited on the opposite side of the substrate using an MSVD coater. Spray deposition parameters and measured optical data are shown in Table 8. The coated substrate had greater than 50 percent haze while maintaining greater than 81 percent transmittance. TABLE 8

    EXAMPLE 4
    [0036] This example illustrates a substrate that has an inner extraction layer (region). The inner extraction layer was formed using a conventional flame spray device, such as the commercially available nHalo flame spray coating device from Beneq Oy. The coating compositions were selected to form alumina or titania nanoparticles. Samples 28 to 31 below contain alumina nanoparticles. Samples 32 to 39 contain titania nanoparticles. The nanoparticles were present at a depth in the range of 0 nm to 10 nm from the surface of the glass. As a general rule, as the concentration of nanoparticles increases, haze increases and transmittance decreases. The haze and transmittance values were measured based on the samples listed in Table 9. TABLE 9

    EXAMPLE 5
    [0037] This Example relates to a coated substrate that has both an inner stripping layer and an outer stripping layer. An internal extraction region was formed by softening the first surface by heating and then directing the titania nanoparticles to the first surface so that at least a portion of the nanoparticles penetrated below the first surface. This was done using a flame spray device as described above. The resulting substrate with the inner extraction layer had a haze (percent) value of 55.6 and a transmittance of 74.4 percent. An outer extraction layer was formed on the second surface of the substrate by heating the substrate in an oven for eight minutes at 232.22°C and then spraying a Hi-Gard® HC 1080 coating composition (commercially available from PPG Industries Ohio , Inc.) onto the second surface using a conventional spray coating device as described above (at 40 psi for 10 seconds) to form the outer extraction layer on the second surface. The substrate with both the inner stripping layer and the outer stripping layer had a haze of 94.4 percent and a transmittance of 74.6%.
    [0038] Those skilled in the art will readily understand that modifications can be made to the invention without abandoning the concepts disclosed in the foregoing description. Therefore, the specific embodiments described in detail herein are illustrative only and are not limited to the scope of the invention, which is given the full scope of the appended claims and any and all equivalents thereto.
    权利要求:
    Claims (12)
    [0001]
    1. Light extracting substrate characterized in that it comprises: a homogeneous glass substrate (20) having a first surface (24) and a second surface (28) opposite the first surface (24); a first light extracting region (30) adjacent to the first surface (24), the first light extracting region (30) comprising nanoparticles embedded in the homogeneous glass substrate (20) at a depth of 0 to 50 microns, and in that the first surface (24) has an average surface roughness of up to 10 nm; and a second light extracting region (32) on the second surface (28), wherein the first light extracting region (30) and the second light extracting region (32) provide opacity in the range of 10% to 40%; and wherein the second light extraction region (32) has an average surface roughness in the range of 50 nanometers to 500 nanometers.
    [0002]
    2. Substrate according to claim 1, characterized in that the nanoparticles are selected from the group consisting of silver oxide, alumina, titania, cerium oxide, zinc oxide, tin oxide, silica, zirconia and their combinations .
    [0003]
    3. Substrate according to claim 1, characterized in that the second extraction region (32) comprises a coating.
    [0004]
    4. Substrate according to claim 3, characterized by the fact that the coating is selected from the group consisting of silica, alumina, zinc oxide, titania, zirconia, tin oxide, silicate coatings and their mixtures.
    [0005]
    5. Substrate according to claim 1, characterized in that the second extraction region (32) is formed by texturing the second surface (28).
    [0006]
    6. Substrate according to claim 1, characterized in that it further comprises an anode layer (18) deposited on the first surface (24).
    [0007]
    7. The substrate of claim 1, characterized in that a lower layer coating stack is deposited on the first surface (24) and an anode layer (18) is deposited on the lower layer coating stack, the lower layer coating stack increasing the transmittance of the glass substrate (20) with the anode layer (18) and with the first or second extraction region (24, 28).
    [0008]
    8. Substrate according to claim 6, characterized in that the anode (18) comprises indium tin oxide or zinc oxide doped with aluminum.
    [0009]
    9. Substrate according to claim 1, characterized by the fact that the first surface (24) is smoother than the second surface (28).
    [0010]
    10. Substrate according to claim 1, characterized by the fact that the depth is from 0 to 10 microns.
    [0011]
    11. Substrate according to claim 1, characterized by the fact that the homogeneous glass substrate (20) consists of conventional soda-lime type silicate glass.
    [0012]
    12. Substrate, according to claim 11, characterized by the fact that the conventional soda-lime type silicate glass is float glass.
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    法律状态:
    2017-10-24| B25A| Requested transfer of rights approved|Owner name: VITRO, S.A.B. DE C.V. (MX) |
    2018-12-18| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-10-22| B25A| Requested transfer of rights approved|Owner name: VITRO FLAT GLASS LLC (US) |
    2019-11-26| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-11-24| B06A| Patent application procedure suspended [chapter 6.1 patent gazette]|
    2021-03-16| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-05-18| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 03/02/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US201161440588P| true| 2011-02-08|2011-02-08|
    US61/440,588|2011-02-08|
    US13/364,898|2012-02-02|
    US13/364,898|US10581020B2|2011-02-08|2012-02-02|Light extracting substrate for organic light emitting diode|
    PCT/US2012/023705|WO2012109095A1|2011-02-08|2012-02-03|Light extracting substrate for organic light emitting diode|BR122020007335-7A| BR122020007335B1|2011-02-08|2012-02-03|METHOD TO PREPARE A LIGHT EXTRACTION SUBSTRATE|
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