Classifications

• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
  • C03C17/34—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions
  • C03C17/3411—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions with at least two coatings of inorganic materials
  • C03C17/3417—Surface treatment of glass, not in the form of fibres or filaments, by coating with at least two coatings having different compositions with at least two coatings of inorganic materials all coatings being oxide coatings
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
  • C03C17/22—Surface treatment of glass, not in the form of fibres or filaments, by coating with other inorganic material
  • C03C17/23—Oxides
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
  • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
  • G02B1/11—Anti-reflection coatings
  • G02B1/113—Anti-reflection coatings using inorganic layer materials only
  • G02B1/115—Multilayers
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C2217/00—Coatings on glass
  • C03C2217/20—Materials for coating a single layer on glass
  • C03C2217/21—Oxides
  • C03C2217/212—TiO2
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C2217/00—Coatings on glass
  • C03C2217/20—Materials for coating a single layer on glass
  • C03C2217/21—Oxides
  • C03C2217/213—SiO2
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C2217/00—Coatings on glass
  • C03C2217/20—Materials for coating a single layer on glass
  • C03C2217/21—Oxides
  • C03C2217/218—V2O5, Nb2O5, Ta2O5
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C2217/00—Coatings on glass
  • C03C2217/20—Materials for coating a single layer on glass
  • C03C2217/21—Oxides
  • C03C2217/228—Other specific oxides
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C2217/00—Coatings on glass
  • C03C2217/70—Properties of coatings
  • C03C2217/73—Anti-reflective coatings with specific characteristics
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C2217/00—Coatings on glass
  • C03C2217/70—Properties of coatings
  • C03C2217/73—Anti-reflective coatings with specific characteristics
  • C03C2217/734—Anti-reflective coatings with specific characteristics comprising an alternation of high and low refractive indexes
• • C—CHEMISTRY; METALLURGY
  • C03—GLASS; MINERAL OR SLAG WOOL
  • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
  • C03C2218/00—Methods for coating glass
  • C03C2218/10—Deposition methods
  • C03C2218/15—Deposition methods from the vapour phase
  • C03C2218/154—Deposition methods from the vapour phase by sputtering

Definitions

• the present disclosure relates to a coated article including coating(s) on a substrate (e.g., glass substrate).
• a coated article can have improved antireflective properties upon heat treatment.
• This presently disclosed subject matter relates to a coated article including an antireflective (AR) coating(s) on a substrate (e.g., glass substrate).
• the coating can be designed to reduce color change of the overall coated article, from the perspective of a viewer, upon heat treatment (e.g., thermal tempering), and/or to improve other optical characteristic(s) such as one or more of: providing substantially neutral coloration, reducing color variability and/or thermal stability, reducing haze, providing lower visible reflection, and/or reducing effects of aging (e.g., reflectance more stable over time, as coated (AC) and/or as heat treated (HT)).
• AR antireflective
• One or more such coating(s) can be provided on a given substrate, such as a single such AR coating on a single side of a glass substrate, or a pair of such AR coatings on opposite sides of a glass substrate.
• Such coated articles can be used in the context of monolithic windows, storefront windows, museum glass showcases, picture frame glass, retail display case windows, tabletops, insulating glass (IG) window units, laminated windows, and/or other suitable applications.
• IG insulating glass
• Coated articles having AR coatings are known in the art. Such coated articles are often subjected to heat treatment such as thermal tempering. Unfortunately, such coated articles have substantially different appearances with respect to color before and after heat treatment, respectively (high reflective AE* values). In other words, the heat treatment causes significant change in reflective coloration of the coated article. This is undesirable because non-heat-treated and heat-treated coated articles will have significantly different appearances from the perspective of a viewer.
• U.S. Patent No. 11,112,538 discloses an antireflective (AR) coating on a glass substrate, where the coating can include the following layers moving from the glass substrate outwardly:
• Zirconium silicon oxide 30-400 A 40-200 A 50-150 A
• the presently disclosed subject matter provides for a coated article including a first antireflective (AR) coating supported by a glass substrate, wherein the first coating comprises, moving away from the glass substrate: a dielectric first high index layer; a dielectric first low index layer; a dielectric second high index layer; a dielectric second low index layer; a dielectric third high index layer; a dielectric first medium index layer; a dielectric third low index layer; and an overcoat layer; wherein the first coating contains no IR reflecting layer based on silver and/or gold; wherein, from the perspective of a viewer of the coated article, the first coating is configured so that the coated article has a film side reflective AE* value of no greater than 3.0 upon heat treatment of at least about 580 degrees C.
• AR antireflective
• the third high index layer is located between and directly contacting the second low index layer and the first medium index layer.
• the first coating is configured so that the coated article has a film side reflective AE* value of no greater than 2.5. In certain embodiments, the first coating is configured so that the coated article has a film side reflective AE* value of no greater than 2.0.
• the first coating is configured so that the coated article has a glass side reflective AE* value of no greater than 2.5. In certain embodiments, the first coating is configured so that the coated article has a glass side reflective AE* value of no greater than 2.0.
• the first coating on the glass substrate has a visible reflectance of no greater than 5%. In certain embodiments, first coating on the glass substrate has a visible reflectance of no greater than 1%.
• the coated article has a visible transmission of at least 70%. In certain embodiments, the coated article has a visible transmission of at least 90%.
• the AR coating is provided on only one side of the glass substrate, so that no AR coating is provided on the side of the glass substrate opposite said AR coating.
• all layers of the first coating are transparent dielectric layers.
• the coated article is heat treated, and has a haze value no greater than 0.50.
• the coated article is thermally tempered.
• the first coating is configmed so that the coated article has fdm side reflective a* value of from -4 to 0, and a film side reflective b* value of from -10 to -5, before and/or after any optional heat treatment.
• the first coating is configmed so that the coated article has film side reflective a* value of from -3 to -1, and a film side reflective b* value of from -9 to -6, before and/or after any optional heat treatment.
• the first, second, and third high index layers each have a refractive index (n) of at least 2. 15, and the first, second, and third low index layers each have a refractive index (n) of no greater than 1.7.
• the dielectric second low index layer comprises an oxide of silicon.
• the dielectric third high index layer comprises an oxide of niobium.
• the first, second, and third low index layers each comprise an oxide of silicon.
• the first high index layer comprises an oxide of titanium.
• the second and third high index layers each comprise an oxide of niobium.
• the medium index layer comprises an oxide of silicon and an oxide of niobium.
• the overcoat layer comprises oxide of Zr and Si.
• the first low index layer of the first coating is at least twice as thick as the second low index layer of the first coating.
• the third low index layer of the first coating is at least twice as thick as the second low index layer of the first coating.
• the second and third high index layers are substantially the same thickness, plus/minus 15%.
• a second coating on is a side of the glass substrate opposite the first coating, wherein the second coating comprises, moving away from the glass substrate: a dielectric first high index layer; a dielectric first low index layer; a dielectric second high index layer; a dielectric second low index layer comprising an oxide of silicon; a dielectric third high index layer comprising an oxide of niobium; a dielectric first medium index layer, wherein the third high index layer comprising the oxide of niobium is located between and directly contacting the second low index layer comprising the oxide of silicon and the first medium index layer; a dielectric third low index layer; and an overcoat layer.
• the presently disclosed subject matter also provides for a coated article including a first antireflective (AR) coating supported by a glass substrate, wherein the first coating comprises, moving away from the glass substrate: a dielectric first high index layer; a dielectric first low index layer; a dielectric second high index layer; a dielectric second low index layer comprising an oxide of silicon; a dielectric third high index layer an oxide of niobium; a dielectric first medium index layer, wherein the third high index layer is located between and directly contacting the second low index layer and the first medium index layer; a dielectric third low index layer; and an overcoat layer; wherein the first coating contains no IR reflecting layer based on silver and/or gold; wherein, from the perspective of a viewer of the coated article, the first coating is configmed so that the coated article has a film side reflective AE* value of no greater than 3.0 upon heat treatment of at least about 580 degrees C.
• AR antireflective
• the presently disclosed subject matter also provides for a coated article including first and second antireflective (AR) coatings supported by a glass substrate, wherein the first and second AR coatings are provided on opposite sides of the glass substrate and each comprises, moving away from the glass substrate: a dielectric first high index layer; a dielectric first low index layer; a dielectric second high index layer; a dielectric second low index layer comprising an oxide of silicon; a dielectric third high index layer comprising an oxide of niobium; a dielectric first medium index layer, wherein the third high index layer comprising the oxide of niobium is located between and directly contacting the second low index layer comprising the oxide of silicon and the first medium index layer; a dielectric third low index layer; and an overcoat layer; wherein the first and second coatings contains no IR reflecting layer based on silver and/or gold; wherein, from the perspective of a viewer of the coated article, the first and second AR coatings are configured so that the coated article has a film side reflective AE* value
• the presently disclosed subject matter also provides a method of making a transparent coated glass product having a coated article comprising a first coating on a glass substrate wherein the first coating comprises from the glass substrate moving outwardly: a dielectric first high index layer; a dielectric first low index layer; a dielectric second high index layer; a dielectric second low index layer comprising an oxide of silicon; a dielectric third high index layer comprising an oxide of niobium; a dielectric fust medium index layer, wherein the third high index layer comprising the oxide of niobium is located between and directly contacting the second low index layer comprising the oxide of silicon and the fust medium index layer; a dielectric third low index layer; and an overcoat layer; wherein the first coating contains no IR reflecting layer based on silver and/or gold; and heat treating the coated article at a temperature of at least 580 degrees C so that the heat treating causes, from the perspective of a viewer of the coated article, the coated article to realize a film side reflective AE* value
• Fig. 1 is a cross sectional view of a monolithic coated article (heat treated or not heat treated) according to an example embodiment of the disclosed subject matter.
• FIG. 2 is a cross sectional view of a monolithic coated article (heat treated or not heat treated) according to another example embodiment of this presently disclosed subject matter.
• references to “embodiment,” “an embodiment,” “example embodiment,” “in various embodiments,” etc. indicate that the embodiment(s) described can include a particular feature, structure, or characteristic, but every embodiment might not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described. After reading the description, it will be apparent to one skilled in the relevant art(s) how to implement the disclosure in alternative embodiments.
• oxide and “nitride” as used herein include various stoichiometries.
• silicon oxide includes stoichiometric SiCF. as well as non-stoichiometric silicon oxide.
• titanium oxide includes stoichiometric TiCF. as well as non-stoichiometric titanium oxide.
• Example embodiments of this disclosed subject matter relate to a coated article including a glass substrate 1, where a coating 10 is provided on the glass substrate 1.
• a coating 10 is provided on the glass substrate 1.
• One antireflective (AR) coating 10, or a pair of AR coatings 10, 20, can be provided on the glass substrate 1.
• Other coatings can also be provided, such as low-E coating(s).
• the coating 10 (and/or 20) can be designed to reduce color change of the overall coated article upon heat treatment (HT), from the perspective of a viewer at least at a normal viewing angle, so as to realize low reflective AE* value(s) upon HT (e.g., thermal tempering).
• HT heat treatment
• the coating 10 can be configured so that the coated article realizes one or more of: improved thermal stability so as to realize low reflective AE* value(s) of no greater than 3.0 (more preferably no greater than 2.5, even more preferably no greater than 2.0, and most preferably no greater than about 1.5) upon HT, reduced haze values upon HT, substantially neutral coloration to a viewer, reduced color variability, low visible reflection, and/or reduced effects of aging (e.g., low reflectance changes upon aging, and/or visible reflectance more stable over time as coated (AC) and/or as heat treated (HT)).
• improved thermal stability so as to realize low reflective AE* value(s) of no greater than 3.0 (more preferably no greater than 2.5, even more preferably no greater than 2.0, and most preferably no greater than about 1.5) upon HT, reduced haze values upon HT, substantially neutral coloration to a viewer, reduced color variability, low visible reflection, and/or reduced effects of aging (e.g., low reflectance changes upon aging, and/or visible reflect
• One or more such coating(s) can be provided on a given substrate, such as a single such AR coating 10 on a single side of a glass substrate 1 as shown in Fig. 1, or a pair of such AR coatings 10, 20 on opposite sides of a glass substrate 1 as shown in Fig. 2.
• Such coated articles e.g., see Figs. 1 and 2) can be used in the context of monolithic windows, storefront windows, museum glass showcases, picture frame glass, retail display case windows, tabletops, insulating glass (IG) window units, laminated windows, and/or other suitable applications.
• the coating(s) can be provided directly, or indirectly, on the glass substrate.
• the coating(s) can be antireflective (AR) coatings in certain example embodiments. From the perspective of the viewer, visible color change due to HT (e.g., thermal tempering) can be reduced or minimized, so that nonheat-treated versions and heat treated versions of the coated article appear similar to the viewer.
• AR antireflective
• niobium oxide based such as NbO x based
• an adjacent high index layer e.g., niobium oxide based, such as NbO x based
• improved haze values e.g., improved thermal stability upon heat treatment (HT) (i.e., lower reflective AE* value(s)), substantially neutral coloration to a viewer, reduced color variability, low visible reflection, and/or reduced effects of aging (e.g., low reflectance changes upon aging, and/or visible reflectance more stable over time as coated (AC) and/or as heat treated (HT)).
• HT thermal stability upon heat treatment
• substantially neutral coloration to a viewer
• reduced color variability e.g., low reflectance changes upon aging, and/or visible reflectance more stable over time as coated (AC) and/or as heat treated (HT)
• AC coated
• HT heat treated
• the layer stack of the coating (10 and/or 20) can include two co-sputtered layers 7, 7’, 9, 9’ for improved durability.
• the center low index layer (e.g, SiO x ) 5, 5’ has been found with NbO x 6, 6’ to reduce haze, and to reduce color shift upon HT so as to provide improved thermal stability and thus lower reflective AE* value(s).
• the TiO x undercoat 2, 2’ can be provided for added thermal stability.
• SiO x 3, 5, 8 provides for a dense micro structure, leading to lower aging effects.
• the coatings 10 and 20 can be provided directly, or indirectly, on the glass substrate 1.
• the coatings 10 and 20 are designed to reduce color change of the overall coated article, from the perspective of a viewer, upon heat treatment (e.g., thermal tempering).
• the coatings 10 and 20 can be antireflective (AR) coatings in certain example embodiments. Contrary to U.S. Patent No. 11,112,538 where two different coatings need to be applied on both/opposite sides of the glass substrate, certain example embodiments of this case provide for a coated article that can achieve desirably low AE* value(s) either by (a) using an AR coating (e.g., 10) on only one side of the glass substrate 1 as shown in Fig.
• AR antireflective
• the first and/or second coatings 10 and 20 are designed so that the coated article realizes substantially neutral color, from the perspective of a viewer, both before and after HT.
• the first and second coatings 10 and 20 can have the same, or different, layer stacks in different embodiments of this disclosed subject matter.
• Typical AR coatings themselves mostly have non-neutral reflective coloration such as blue, purple or pink coloration, and thus cannot themselves achieve reflective neutral coloration. Moreover, the non-neutral coloration of typical AR coatings becomes worse after HT such as thermal tempering.
• example embodiments of this disclosed subject matter relate to an anti-reflective coating article which can achieve reflective neutral visible coloration, both before and after heat treatment such as thermal tempering, which is advantageous for the reasons discussed herein.
• Coated articles can optionally be “heat treated” (HT) in certain example embodiments of this disclosed subject matter, and are preferably designed to be heat treatable.
• the terms “heat treatment”, “heat treated” and “heat treating” as used herein mean heating the article to a temperature sufficient to achieve thermal tempering, heat bending, and/or heat strengthening of the glass inclusive article.
• This definition includes, for example, heating a coated article in an oven or furnace at a temperature of least about 580 degrees C, more preferably at least about 600 degrees C, for a sufficient period to allow tempering, bending, and/or heat strengthening.
• the HT can be for at least about 4 or 5 minutes.
• the coated article may or may not be heat treated in different embodiments of this disclosed subject matter.
• the value AE* is known in the art, and is important in determining whether or not upon heat treatment (HT) there is matchability, or substantial matchability, in the context of this disclosed subject matter. Color herein is described by reference to the a*, b* values. For purposes of example, the term Aa* is simply indicative of how much color value a* changes due to heat treatment. The term AE* is well understood in the art and is reported, along with various techniques for determining it, in ASTM 2244-93 as well as being reported in Hunter et. al., The Measurement of Appearance, 2 nd Ed. Cptr. 9, page 162 et seq.
• AE* (and AE) is a way of adequately expressing the change (or lack thereof) in reflectance and/or transmittance (and thus color appearance, as well) in an article after or due to HT.
• AE can be calculated by the “ab” technique, or by the Hunter technique (designated by employing a subscript “H”).
• AE* corresponds to the CIE LAB Scale L*, a*, b*.
• CIE LAB 1976 known as the L*, a*, b* scale can be used, wherein:
• Figure 1 is a cross sectional view of a coated article according to an example embodiment of this disclosed subject matter.
• Glass substrate 1 e.g., clear, green, bronze, grey, blue, or blue-green glass for instance
• Glass substrate 1 can be from about 1.0 to 12.0 mm thick, more preferably from about 4-8 mm thick, with an example glass substrate thickness being about 6 mm thick.
• All layers shown in Fig. 1 (and Fig. 2) are transparent dielectric layers, and all can be deposited via sputter-deposition or any other suitable technique.
• Multi-layer AR coatings offer broad antireflection regions in the spectrum, and can for example be based on AR principles of quarter-half-quarter, where moving outwardly from the glass the coatings can each include a quarter wave medium index layer, a half wave high index layer, a quarter wave low index layer, and then air.
• a thin hydrophobic layer can be provided over the AR coating(s) in certain example instances, and/or one could add a thin layer between high and low index layers to improve interfacial adhesion in certain example embodiments.
• a single AR coating 10 is provided in the Fig. 1 embodiment. In the Fig.
• a low-E coating (not shown) can be provided on the side of the glass substrate 1 opposite coating 10, and such a coated article can be used in monolithic or IG window unit applications for example.
• Example low-E coatings are described, for purposes of example, in U.S. Patent No. 11,236,014, 11,168,023, and 10,882,997, the disclosures of which are hereby incorporated herein by reference in their entireties.
• another substantially the same AR coating can be provided in a symmetrical manner as shown by AR coating 20 in Fig 2.
• antireflective (AR) coating 10 is provided on one side of glass substrate 1, and another AR coating 20 is provided on the other side of glass substrate 1.
• the coatings 10 and 20 can be the same, or similar, in certain example embodiments.
• the materials of the respective layers of coatings 10 and 20 can be of the same materials, but layer thicknesses between the two coatings can vary.
• coatings 10 and 20 do not contain any infrared (IR) reflecting layer based on silver or gold.
• AR coating 10 includes sputter-deposited layers 2, 3, 4, 5, 6, 7, 8, and 9 whereas AR coating 20 includes corresponding sputter-deposited layers 2’, 3’, 4’, 5’, 6’, 7’, 8’, and 9’.
• Corresponding layers in coatings 10/20 can be of like material and/or like thickness.
• layers 2, 2’, 4, 4’, 6 and 6’ are high index layers having a refractive index (n) of at least about 2. 15, more preferably of at least about 2.20, and most preferably of at least about 2.25.
• High index layers 2, 2’, 4, 4’, 6 and 6’ can each be of or including high index transparent dielectric material such as titanium oxide (e.g., TiO x , where x is from 1.5 to 2.0, more preferably from 1.8 to 2.0, with an example being TiCL) or niobium oxide (e.g., NbO x where 1.4 to 2.1, more preferably from 1.5 to 2.0, with examples being Nb ⁇ O and NbCh).
• titanium oxide e.g., TiO x , where x is from 1.5 to 2.0, more preferably from 1.8 to 2.0, with an example being TiCL
• niobium oxide e.g., NbO x where x is from 1.4 to 2.1, more preferably from 1.5 to 2.0, with examples being Nb ⁇ O
• Layers 3, 3’, 5, 5’, 8, and 8’ are low index layers having a refractive index (n) of less than about 1.8, more preferably less than about 1.7, and most preferably less than about 1.6.
• Low index layers 3, 3’, 5, 5’, 8, and 8’ can each be of or including low index transparent dielectric material such as silicon oxide (e.g., SiOz) or any other suitable low index material.
• the silicon oxide (e.g., SiCL) of any of layers 3, 3’, 5 and/or 5’ can be doped with other materials such as aluminum (Al) and/or nitrogen (N) in certain example embodiments of this disclosed subject matter.
• any of layers 3, 3’, 5, 5’, 8, and/or 8’ can be of or including silicon oxide (e.g., SiO?) and can include from about 0-8% (more preferably from 1-5%) Al and/or from about 0-10% (more preferably from about 1-5%) N.
• the titanium oxide and/or niobium oxide of the high index layers 2, 2’, 4, 4’, 6 and 6’ can also be doped with other materials in certain example embodiments.
• layers 2 and 3 (or 2’ and 3’), for example, to be replaced with a medium index layer (e.g., NbSiO x ) having a refractive index (n) of from 1.70 to 2.10, more preferably from 1.75 to 2.0, and even more preferably from 1.75 to 1.95.
• Medium index layers 7, 7’, 9, and 9’ each have a refractive index (n) of from 1.70 to 2.10, more preferably from 1.75 to 2.0, and even more preferably from 1.75 to 1.95.
• medium index layers 7 and 7’ can be of a medium index material such as a combination of niobium oxide and silicon oxide (also known as niobium silicon oxide), or another material such as a combination of titanium oxide and silicon oxide (also known as titanium silicon oxide), or any other suitable medium index material.
• medium index layers 9, and 9’ can be of a medium index material such as a combination of zirconium oxide and silicon oxide (also known as zirconium silicon oxide), or any other suitable medium index material. And the zirconium in layers 9, 9’ helps improve durability of the respective coatings 10 and 20. It is also noted that stack sequences from either the Fig. 1 or Fig.
• each of the layers can include other materials such as dopants. It will be appreciated of course that other layers can also be provided, or certain layers can be omitted, and different materials can be used, in certain alternative embodiments of this disclosed subject matter.
• other layer(s) can also be provided in other locations of the coatings.
• the coatings 10 and 20 or layers thereof is/are “on” or “supported by” substrate 1 (directly or indirectly), other layer(s) can be provided therebetween.
• a layer or coating is considered “on” the substrate 1 even when other layer(s) can be provided therebetween (i.e., the terms “on” and “supported by” as used herein are not limited to directly contacting).
• niobium oxide based such as NbO x based
• NbO x based adjacent high index layer
• improved haze values e.g., improved thermal stability upon heat treatment (HT) (i.e., lower reflective AE* value(s))
• substantially neutral coloration e.g., reduced color variability, low visible reflection, and/or reduced effects of aging (e.g., low reflectance changes upon aging, and/or visible reflectance more stable over time as coated (AC) and/or as heat treated (HT)).
• HT thermal stability upon heat treatment
• substantially neutral coloration e.g., lower reflective AE* value(s)
• reduced color variability e.g., low reflectance changes upon aging, and/or visible reflectance more stable over time as coated (AC) and/or as heat treated (HT)
• AC coated
• HT heat treated
• Co-sputtered layers 7, 7’, 9, 9’ can be provided for improved durability.
• the center low index layer (e.g, SiO x ) 5, 5’ has been found with NbO x 6, 6’ to reduce haze, and to reduce color shift upon HT so as to provide improved thermal stability and thus lower reflective AE* value(s).
• the TiO x undercoat 2, 2’ can be provided for added thermal stability.
• One or more of SiO x inclusive layers 3, 5, 8 can be provided for a dense microstructure, leading to lower aging effects.
• the first low index layer 3 can be at least twice as thick as the second low index layer 5 (more preferably at least three times as thick); and/or the third low index layer 8 can be at least twice as thick as the second low index layer 5 (more preferably at least three times as thick, or at least four times as thick).
• the second and third high index layers 4 and 6 can be substantially the same thickness, namely the same thickness plus/minus about 15%.
• example thicknesses in angstroms
• materials for the respective layers 2-9 of the coating 10 on the glass substrate 1 are as follows in certain example embodiments for achieving desired visible transmission, low visible reflection, fairly neutral reflective coloration, low haze, and thermal stability upon optional HT (layers are listed in order moving away from the glass substrate 1).
• Table 1 below provides example materials and thicknesses for AR coating 10 and/or 20, before and/or after optional HT. Similar materials/ thicknesses can of course be provide for layers 2’ -9’ of coating 20.
• coated articles according to the Fig. 1 and/or Fig. 2 embodiment(s) can have color/optical characteristics as follows in Table 2 according to Illuminant C, 2 degree observer. And Table 3 provides example data after HT. It is noted that TY and T ViS stand for visible transmission through the Fig. 1 coated article in Table 2, RY stands for visible reflectance of the coated article from the point of view of the intended viewer, and that the a* and b* values under RY stand for the respective CIE visible reflectance colorations of the overall coated article from the point of view of the intended viewer and indicate neutral reflective coloration of the overall coated article.
• TY and T ViS stand for visible transmission through the Fig. 1 coated article in Table 2
• RY stands for visible reflectance of the coated article from the point of view of the intended viewer
• the a* and b* values under RY stand for the respective CIE visible reflectance colorations of the overall coated article from the point of view of the intended viewer and indicate neutral reflective coloration of the overall coated article.
• Subscript “g” indicates from the glass side of the coated article (e.g., Fig. 1 embodiment), and subscript “f ’ indicates from the film/coating side of the coated article.
• the a*, b* values under RfY relate to “film” side reflective coloration values, and the a*, b* values under R g Y relate to glass side reflective coloration values.
• the AE* values in Table 3, indicating thermal stability, are at the normal viewing angle, or at about an 8 degree viewing angle.
• Table 2 Optical Characteristics (Fig. 1 and/or 2 coated article; as-coated & pre-HT)
• Table 3 Optical Characteristics (Fig. 1 and/or 2 coated article; after optional HT)
• Example 1 according to an example embodiment of this disclosed subject matter is compared below to Comparative Example (CE) 1.
• Each as shown in Fig. 2 of the instant application, has the same coating on both sides of the glass substrate 1 so as to represent symmetrical coatings.
• each has an AR coating, where the Example 1 coating shown below was provided in a symmetrical manner on both sides of the glass substrate 1 for Example 1 as shown in Fig. 2 of the instant application, and the coating of CE 1 on both sides of the glass substrate is based on the coating from Table 11 of U.S. Patent No. U.S. Patent No. 11,112,538.
• Example 1 Measured monolithically, both before and after thermal tempering (HT), with a Perkin Elmer device, the coatings on the glass substrate of Example 1 and Comparative Example 1 (CE 1) had the following optical characteristics. These measurements were taken with the same coating on both sides of the glass substrate, for example as shown in Fig. 2 for Example 1. Note that all coatings had visible transmission well over 70%, before and after HT at a temperature of at least 580 degrees C (e.g., thermal tempering, heat strengthening, and/or heat bending). The data for Example 1 is in the two right-most columns, whereas data for CE 1 is in the second and third columns from the left edge of the table.
• HT thermal tempering
• CE 1 Comparative Example 1
• Example 1 with the addition of layers 5 and 6 to the coating as shown in Figs. 1-2, had unexpectedly and surprisingly improved values with respect to haze and thermal stability (AE*), compared to Comparative Example 1 (CE 1).
• AE* haze and thermal stability
• Comparative Example 1 had an undesirably high AE* value of 6.9.
• Example 1 had a desirably low haze value of 0.4, whereas Comparative Example 1 had an undesirably high haze value of 0.9.
• Example 1 had slightly better (lower) film side reflection (RfY) compared to CE 1.
• RfY film side reflection

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