Coated article having antireflective coating

Abstract

A coated article comprising a substrate having an antireflective (AR) coating disposed on a first surface of the substrate is disclosed herein. In some embodiments, a second AR coating is disposed on a second surface of the substrate opposite the first surface. An insulated gas unit (IGU) including the coated article is disclosed herein.

Description

BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT COATED ARTICLE HAVING ANTIREFLECTIVE COATING Field of the Disclosure

[0001] The present disclosure is related to antireflective (AR) coatings and coated articles including the same. Background of the Disclosure

[0002] Coated articles having AR coatings are known in the art. To achieve sufficient optical quality, such as low visible reflectivity and / or neutral coloration, these coatings require multiple high index dielectric layers, such as NbOxand / or TiOxlayers, and other costly materials, such as SiOx. These coated articles are typically heat-treated coated articles, for example, such as in U.S. Patent No.11, 112, 538 or U.S. Patent Application No.17 / 674,082, which are incorporated herein by reference in their entirety. Heat treatment adds additional costs and manufacturing time. Further, insulated glass units (IGUs), for example triple glazing units, do not use coatings on surface #3 or #4 because the cost of the IGU would be prohibitive. There is a need in the art for a coated article having an AR coating that can achieve low visible reflectivity and / or neutral coloration at lower cost and manufacturing time. Brief Summary of Disclosure

[0003] Coated articles are disclosed herein. In an exemplary embodiment of the present disclosure, a coated article comprises a substrate having an antireflective (AR) coating disposed on a first surface of the substrate, wherein a second surface of the substrate opposite the first surface does not have an AR coating disposed thereon, and wherein the AR coating comprises, moving away from a first surface of the first glass substrate, a first low index dielectric layer comprising an oxynitride of silicon, a first high index dielectric layer comprising an oxide of niobium, and a second low index dielectric layer comprising an oxynitride of silicon.

[0004] In some embodiments, the AR coating comprises, moving away from a first surface of the first glass substrate a titanium oxide layer; a first silicon oxynitride layer; a niobium oxide layer; a niobium silicon oxide layer; a second silicon oxide layer; and a silicon zirconium oxide layer or a zirconium oxide layer, wherein the AR coating includes only one niobium oxide layer, and ACTIVE 513648775.1 1BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT wherein the substrate is a float glass or a low iron glass.

[0005] In an exemplary embodiment of the present disclosure, a coated article comprises a substrate; a first antireflective (AR) coating disposed on a first side of the substrate; and a second AR coating disposed on a second side of the substrate, the second side opposite the first side, wherein the first and second AR coating each comprise, moving away from a first surface of the first glass substrate, a first low index dielectric layer comprising an oxynitride of silicon; a first high index dielectric layer comprising an oxide of niobium; and a second low index dielectric layer comprising an oxynitride of silicon, and wherein, from the perspective of the viewer of the coated article, the first and second AR coatings both have a positive, a neutral, or negative a* reflective value.

[0006] In some embodiments, the first and second AR coating each comprise, moving away from a first surface of the first glass substrate, a titanium oxide layer; a first silicon oxynitride layer; a niobium oxide layer; a niobium silicon oxide layer; a second silicon oxide layer; and a silicon zirconium oxide layer or a zirconium oxide layer, wherein the AR coating includes only one niobium oxide layer, wherein the substrate is a float glass or a low iron glass, and wherein, from the perspective of the viewer of the coated article, the first and second AR coatings both have a positive, a neutral, or negative a* reflective value.

[0007] In an exemplary embodiment of the present disclosure, an insulated glass unit (IGU) comprises the coated article of any of the preceding paragraphs; a second glass substrate; and a third glass substrate, wherein the coated article, the second glass substrate, and the third glass substrate are spaced apart.

[0008] The insulated glass unit (IGU) of the immediately preceding paragraph, wherein the coated article is disposed between the second glass substrate and the third glass substrate. Brief Summary of Drawings

[0009] To assist in understanding the present disclosure, reference is now made to the following description taken in conjunction with the accompanying drawings, in which:

[0010] Figure 1 depicts a schematic view of a coated article in accordance with some embodiments of the present disclosure.

[0011] Figure 2 depicts a schematic view of a coated article in accordance with some embodiments of the present disclosure. ACTIVE 513648775.1 2BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT

[0012] Figure 3 depicts a schematic view of a coated article in accordance with some embodiments of the present disclosure.

[0013] Figure 4 depicts a schematic view of an insulated glass unit in accordance with some embodiments of the present disclosure.

[0014] Figure 5 depicts a schematic view of an insulated glass unit in accordance with some embodiments of the present disclosure.

[0015] Figure 6 depicts a schematic view of an insulated glass unit in accordance with some embodiments of the present disclosure.

[0016] Figure 7 depicts a schematic view of an insulated glass unit in accordance with some embodiments of the present disclosure. Description

[0017] The present disclosure relates to a coated article including an antireflective (AR) coating(s) on a substrate (e.g., glass substrate). The coating may be designed to reduce color change of the overall coated article, from the perspective of a viewer, and / or to improve other optical characteristic(s) such as providing substantially neutral coloration and / or providing lower visible reflection. One or more such coating(s) may 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 may be used in the context of monolithic windows, storefront windows, museum glass showcases, picture frame glass, retail display case windows, table tops, insulating glass (IG) window units, laminated windows, and / or other suitable applications.

[0018] Figure 1 depicts a coated article 100 having an antireflective (AR) coating 102 in accordance with some embodiments of the present disclosure. The coated article 100 includes the AR coating 102 on a first surface 104 of a substrate 106. The second surface 108 of the substrate 106 may be uncoated, coated with a coating that is not an AR coating (e.g., a low-e coating or the like), or coated with an AR coating (discussed in accordance with FIG.2 below). Example low-E coatings are described, for purposes of example, in U.S. Pat. Nos. 11,236,014, 11,168,023, and 10,882,997, the disclosures of which are hereby incorporated herein by reference in their entireties. In the embodiment depicted in FIG.1, the second surface 108 of the substrate 106 is uncoated.

[0019] All layers of the AR coating 102 may be transparent dielectric layers and may be deposited ACTIVE 513648775.1 3BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT via sputter-deposition or any other suitable technique. Multi-layer AR coatings offer broad antireflection regions in the spectrum and may for example be based on AR principles of quarter- half-quarter, where moving outwardly from the glass the coatings may each include a quarter wave medium index layer, a half wave high index layer, a quarter wave low index layer, and then air. Moreover, a thin hydrophobic layer may 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.

[0020] It is noted that the terms “oxide” and “oxynitride” as used herein include various stoichiometries. For example, the term silicon oxide includes stoichiometric SiO2, as well as non- stoichiometric silicon oxide. As another example, the term titanium oxide includes stoichiometric TiO2, as well as non-stoichiometric titanium oxide.

[0021] Refractive index (n) as discussed herein are at a wavelength of 550 nm.

[0022] In certain example embodiments, it is possible for each of the layers to include other materials such as dopants. It will be appreciated that other layers may also be provided, or certain layers may be omitted, and different materials may be used, in certain alternative embodiments of the present disclosure.

[0023] Generally, other layer(s) may also be provided in other locations of the coatings. Thus, while the AR coating 102 or layers thereof is / are “on” or “supported by” substrate 106 (directly or indirectly), other layer(s) may be provided therebetween. Thus, for example, a layer or coating is considered “on” the substrate 106 even when other layer(s) may be provided therebetween (i.e., the terms “on” and “supported by” as used herein are not limited to directly contacting). However, there may be directly contacting layers, for example, as shown in the exemplary embodiments of FIG.1.

[0024] The substrate 106 may be a float glass, low iron glass, borosilicate glass, polyethylene terephthalate (PET), polycarbonate (PC), and the like. The substrate 106 may range in thickness from about 1.0 mm to about 12.0 mm. In some embodiments, the thickness may range from about 3.0 mm to about 8.0 mm. In some embodiments, the thickness may range from about 3.0 mm to about 4.0 mm. In some embodiments, the substrate 106 is float glass.

[0025] The anti-reflective coating 102 may include, moving away from the first surface 104 of the glass substrate 106, a high index dielectric layer 110 comprising an oxide of titanium, a first low index dielectric layer 112 comprising an oxynitride of silicon, a high index dielectric layer 114 ACTIVE 513648775.1 4BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT comprising an oxide of niobium, a medium index dielectric layer 116 comprising an oxide of niobium and silicon, a second low index dielectric layer 118 comprising an oxynitride of silicon, and an overcoat layer 120. In some embodiments, the overcoat layer 120 comprises an oxide of silicon (Si) and zirconium (Zr). In some embodiments, the AR coating 102 may range in thickness from about 165 nm to 235 nm. In some embodiments, the AR coating 102 has a thickness from about 190 nm to about 210 nm.

[0026] The high index dielectric layer 110 may have a refractive index (n) of at least about 2.35. In some embodiments, the refractive index may range from about 2.35 to about 2.6. The high index dielectric layer 110 may comprise an oxide of titanium. The oxide of titanium may have a formula of TiOx, where x ranges from about 1.5 to 2.0. In some embodiments, x may range from about 1.8 to 2.0. Exemplary oxides of titanium include TiO2. Alternatively, the high index dielectric layer 110 may be an oxide of niobium, such as NbOx, and more preferably, Nb2O5. The high index dielectric layer 110 may include other materials, such as dopants. Dopants may include Zr, Fe, C, N, Sn, and combinations thereof. The high index dielectric layer 110 may have a thickness ranging from about 5 nm to about 15 nm. In some embodiments, the high index dielectric layer 110 has a thickness of about 10 nm. In some embodiments, the high index dielectric layer 110 may be TiOx having a thickness ranging from about 8.8 nm to about 9.5 nm. In one embodiment, the high index dielectric layer 110 may be TiOx having a thickness of about 8.8 nm to 9.0 nm. In one embodiment, the high index dielectric layer 110 may be TiOx having a thickness of about 9.2 to about 9.4 nm.

[0027] The first and second low index layers 112, 118 may have a refractive index (n) of about 1.9 or less. In some embodiments, the refractive index may be less than about 1.7. In some embodiments, the refractive index may be less than about 1.6. The refractive index may range from about 1.5 to about 1.9. The first and second low index dielectric layers 112, 118 may comprise an oxynitride of silicon. The oxynitride of silicon may have a formula of SiOxNy, where x ranges from 0<x<2 and y ranges from 0<x<1. The first and second low index dielectric layers 112, 118 may include other materials, such as dopants. Dopants may include aluminum (Al), boron (B), Phosphorus (P), Titanium (Ti), and combinations thereof. The dopants may be present in amounts ranging up to about 10%. In some embodiments, the first and second low index layers 112, 118 may be SiOxNyhaving Al-doping of about 5% to about 10%. The first low index dielectric layer 112 may have a thickness ranging from about 20 nm to about 40 nm. In some ACTIVE 513648775.1 5BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT embodiments, the first low index dielectric layer 112 has a thickness of about 31 nm to about 32 nm. In some embodiments, the first low index dielectric layer 112 may have a thickness of about 34 nm to about 35 nm. In some embodiments, the first low index dielectric layer 112 comprises SiOxNy and has a thickness of about 31 nm to about 32 nm. In some embodiments, the first low index dielectric layer 112 comprises SiOxNy and has a thickness of about 34 nm to about 35 nm. In some embodiments, the second low index dielectric layer 118 may have a thickness ranging from about 40 nm to 60 nm. In some embodiments, the second low index dielectric layer 118 has a thickness of about 40 nm to about 55 nm. In some embodiments, the second low index dielectric layer 118 has a thickness of about 44 nm to about 52 nm. In some embodiments, the second low index dielectric layer 118 has a thickness of about 40 nm to about 42 nm. In some embodiments, the second low index dielectric layer 118 comprises SiOxNy and has a thickness of about 44 nm to about 45 nm. In some embodiments, the second low index dielectric layer 118 comprises SiOxNy and has a thickness of about 51 nm to about 52 nm.

[0028] The high index dielectric layer 114 may have a refractive index (n) of at least about 2.35. In some embodiments, the refractive index may range from about 2.35 to about 2.6. The high index dielectric layer 114 may comprise an oxide of niobium. The oxide of niobium may have a formula of NbOx, where x ranges from about 1.4 to 2.1. In some embodiments, x may range from about 1.5 to 2.0. Exemplary oxides of niobium include Nb2O5, NbO2, NbO, and combinations thereof. Alternatively, the high index dielectric layer 114 may be an oxide of titanium, such as TiOx, and more preferably, TiO2. The high index dielectric layer 114 may include other materials, such as dopants. Dopants may include Li, K, Zn, Ca, Zr, and combinations thereof. In some embodiments, the high index dielectric layer 114 may have a thickness ranging from about 75 nm to about 95 nm. In some embodiments, the high index dielectric layer 114 has a thickness of about 84 nm to about 88 nm. In some embodiments, the high index dielectric layer 114 comprises NbOx and has a thickness ranging from about 75 nm to about 95 nm. In some embodiments, the high index dielectric layer 114 comprises NbOx and has a thickness of about 84 nm to about 88 nm. In some embodiments, the high index dielectric layer 114 comprises NbOx and has a thickness of about 89 nm to about 93 nm.

[0029] The medium index dielectric layer 116 may have a refractive index (n) of about 1.7 to about 2.10. In some embodiments, the refractive index may be about 1.75 to 2.10. In some embodiments, the refractive index may be about 1.75 to about 1.95. The medium index dielectric ACTIVE 513648775.1 6BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT layer 116 may comprise an oxide of niobium and silicon. The oxide of niobium and silicon may have a formula of NbSiOx, where x ranges from about 0 to about 4.5. Exemplary oxides of niobium and silicon may include NbSiO4. The medium index dielectric layer 116 may include other materials, such as dopants. In some embodiments, the medium index dielectric layer 116 may include NbSiOxhaving Al-doping of Silicon of about 5% to 10%. Alternatively, the high index dielectric layer 114 may be an oxide of titanium and silicon, such as TiSiOx. In some embodiments, the medium index dielectric layer 116 may have a thickness ranging from about 10 nm to about 30 nm. In some embodiments, the medium index dielectric layer 116 has a thickness of about 19 nm to about 21 nm. In some embodiments, the medium index dielectric layer 116 comprises NbSiOx and has a thickness ranging from about 10 nm to about 30 nm. In some embodiments, the medium index dielectric layer 116 comprises NbSiOx and has a thickness of about 19 nm to about 21 nm.

[0030] The overcoat layer 120 may have a refractive index (n) of about 1.6 to about 2.0. In some embodiments, the refractive index may be about 1.8. The overcoating layer 120 may include titanium oxide, silicon oxide, niobium oxide, niobium silicon oxide, silicon zirconium oxide, zirconium oxide, and combinations thereof. In some embodiments, the overcoat layer 120 may comprise an oxide of silicon and zirconium, or an oxide of zirconium. The oxide of silicon and zirconium may have a formula of SiZrOx where x ranges from 0<x≤4. Exemplary oxides of silicon and zirconium may include SiZrO4. The oxide of silicon and zirconium may have a formula of ZrOx where x ranges from 0<x≤2. Exemplary oxides of zirconium may include ZrO2. The overcoat layer 120 may include other materials, such as dopants. In some embodiments, the overcoating layer 120 may include SiZrOx having Al-doping of about 5% to 10%. In some embodiments, the overcoat layer 120 may have a thickness ranging from about 5 nm to about 15 nm. In some embodiments, the overcoat layer 120 has a thickness of about 9 nm to about 11 nm. In some embodiments, the overcoat layer 120 comprises SiZrOx and has a thickness of about 9 nm to about 11 nm.

[0031] The AR coating 102 may include other and additional layers. Moreover, the thicknesses of the layers disclosed here are exemplary. Other thickness may be envisioned. In some embodiments, the AR coating 102 includes one high index dielectric layer comprising an oxide of niobium, such as NbOx. For example, the AR coating 102 may include multiple high index dielectric layers as disclosed herein, where only one of the high index dielectric layers comprises ACTIVE 513648775.1 7BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT an oxide of niobium. The AR coating 102 may not include an infrared reflective (IRR) layer based on silver and / or gold. In some embodiments, the AR coating 102 is, moving away from the substrate 106, TiOxlayer / SiOxNylayer / NbOxlayer / NbSiOxlayer / SiOxN layery / SiZrOxlayer. In some embodiments, the AR coating 102 is, moving away from the substrate 106, TiOxlayer / SiOxNylayer / NbOxlayer / NbSiOxlayer / SiOxNylayer / ZrOxlayer.

[0032] Figure 2 depicts a coated article 200 in accordance with some embodiments of the present disclosure. The coated article 200 includes the substrate 106 and AR coating 102 on the first surface 104 of the substrate 106. The coated article 200 includes a second AR coating 202 on the second surface 108 of the substrate 106. The second AR coating 202 may be the same or different from the AR coating 102. In some embodiments, the second AR coating 202 is identical to the first AR coating 102 as shown in FIG. 2, where layers 110’, 112’, 114’, 116’, 118’, 120’ are identical, respectively, to layers 110, 112, 114, 116, 118, and 120. The double-sided AR coated article 200 may have, from the perspective of the viewer, a* reflective values for each of the AR coating 102, 202 that are both positive, neutral (e.g., 0), or negative. For example, in an embodiment where the substrate 106 is a float glass, the coated article 200, from the perspective of the viewer, may have a* reflective values for each AR coating 102, 202 that are neutral or negative. For example, in an embodiment where the substrate 106 is a low iron glass, the coated article 200 from the perspective of the viewer, may have a* reflective values for each AR coating 102, 202 that are both slightly positive (e.g., about +1 or less), both neutral, or both negative. In some embodiments, the substrate 106 is a float glass and the AR coatings 102, 202 are each, moving away from the substrate 106, TiOxlayer / SiOxNylayer / NbOxlayer / NbSiOxlayer / SiOxN layery / SiZrOxlayer. In some embodiments, the substrate 106 is a float glass and the AR coatings 102, 202 are each, moving away from the substrate 106, TiOxlayer / SiOxNylayer / NbOxlayer / NbSiOxlayer / SiOxNylayer / ZrOxlayer.

[0033] Figure 3 depicts a coated article 300 in accordance with some embodiments of the present disclosure. In some embodiments, and as shown in Fig. 3, the substrate 106 may include a first substrate 302, a second substrate 304, and an adhesive layer 306 disposed therebetween. The adhesive layer 306 may laminate the first substrate 302 to the second substrate 304. The first substrate 302 may include a first side 308 opposite to a side contacting the adhesive layer 306. The second substrate 304 may include a second side 310 opposite to a side contacting the adhesive layer 306. The AR coating 102 may be disposed on the first side 308 and the AR coating 202 may ACTIVE 513648775.1 8BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT be disposed on the second side 310.

[0034] The first and second substrates 302 and 304 may comprises the same or different materials. The first and second substrates 302, 304 may be, independently, a float glass, low iron glass, borosilicate glass, polyethylene terephthalate (PET), polycarbonate (PC), and the like. The substrates 302, 304 may range in thickness from about 1.0 mm to about 12.0 mm. In some embodiments, the thickness may range from about 3.0 mm to about 8.0 mm. In some embodiments, the thickness may range from about 3.0 mm to about 4.0 mm. In some embodiments, the substrates 302,304 are each 8 mm float glass.

[0035] The adhesive layer may range in thickness from about 0.3 mm to about 3 mm. In some embodiments, the adhesive layer may be about 1.0 to about 2 mm. In some embodiments, the adhesive layer may be about 1.5 mm. The adhesive layer may comprise polyvinylbutyral (PVB), or other transparent adhesive materials.

[0036] The coatings 100, 200, 300 achieve high visible transmission, low visible reflection, and / or fairly neutral reflective coloration

[0037] Coloration herein is described with reference to CIE LAB 1976 standards using illumination C with observer 2 degree, where L* is lightness units, a* is red-green units, and b* is yellow-blue units. In addition reflectance and transmission of the coated articles are described herein using Y from the CIE / XYZ system where Y / T is transmission, Y / Rfis film side reflectance [i.e., the coated side of the coated article] and Y / Rgis glass side reflectance [i.e., the uncoated side of the coated article] from the perspective of the viewer. Y / T, Y / Rf, and Y / Rfare dimensionless units and are measured near normal angle (i.e., 8 degree from normal direction) unless otherwise specified. T, Rfand Rgas described herein are transmission, film side reflectance, and glass side reflectance, respectively, measured over wavelengths of the visible spectrum, and have units of percentage (%), e.g., percentage of light at a given wavelength that is reflected relative to the total amount of light incident on the coated article.

[0038] The coated article 100, using a float glass for substrate 106, may have an Rf, measured over a wavelength range of 380 nm to 780 nm, ranging from about 4.0% to about 10.0%. Over a wavelength range of 450 nm to 675 nm, Rfabout 4.0% to about 6.5%. At wavelengths over 675 nm, the Rfmay be greater than about 4.5%. The Rgmay range from about 4.8% to about 10.0% over the wavelength range of 380 nm to 780. The coated article 100, using a float glass for substrate 106, may have T on the film side, measured over a wavelength range of 380 nm to 780 ACTIVE 513648775.1 9BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT nm ranging from about 82.0% to about 94.0%. Y / T may range from about 83.0 to about 95.0. In some embodiments, Y / T ranges from about 93.0 to about 94.0. Y / Rfmay range from about 4.0 to about 9.0. Y / Rgmay range from about 4.5 to about 8.5. Y / Rfmay be the same or substantially the same using low iron glass for substrate 106.

[0039] The coated article 100, using a float glass for substrate 106, may have a* reflective values near normal angle (i.e., 8 degrees from normal direction) on the film side ranging from about 0 to about -2. In some embodiments, a* reflective values near normal angle on the film side may range from about -1 to -2. The coated article 100 may have b* reflective values on the film side ranging from about 0 to -2.5. If the substrate 106 is a low iron glass, the a* and b* reflective values on the film side of coated article 100 may each increase about +0.5.

[0040] The coated article 100, using a float glass for substrate 106, may have a* transmissive values on the film side ranging from about -0.5 to about -1.5. The coated article 100 may have b* transmissive values on the film side ranging from about 0 to about 1. If the substrate 106 is a low iron glass, the a* transmissive values on the glass side of coated article 100 may each increase about +0.5 and Y / T may increase by about +1.

[0041] The coated article 100, using a float glass for substrate 106, may have a* reflective values on the glass side ranging from 1 to about -2. The coated article 100 may have b* reflective values on the glass side ranging from about 0 to about -3. If the substrate 106 is a low iron glass, the a* reflective values on the glass side of coated article 100 may each increase about +0.5. Regarding transmission on the glass side, a* transmissive values and b* transmissive values are substantially the same or the same as on the film side.

[0042] The coated articles 200, 300, using a float glass for substrates 106, 302, and 304, may have an Rf, measured over a wavelength range of 380 nm to 780 nm, ranging 0.2% to about 11.0%. Over a wavelength range of 450 nm to 675 nm, the Rfmay be between about 0.2 to about 2.0%. At wavelengths over 675 nm, the Rfmay be greater than about 2.0%. The coated article 200, 300, using a float glass for substrate 106, 302, 304, may have a T, measured over a wavelength range of 440 nm to 650 nm, ranging from about 95.0 % or more. Y / T may range from about 96.0 to about 98.0. In some embodiments, Y / T may be about 97.2. Y / Rfmay range from great than about 1.0 to less than about 1.5. In some embodiments, Y / Rfmay be about 1.1 to about 1.2. Y / Rfmay be the same or substantially the same using low iron glass for substrates 106, 302, and 304.

[0043] In double sided coated articles 200, 300, when the substrates 106, 302, 304 are float glass, ACTIVE 513648775.1 10BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT the a* reflective values near normal angle may range from about 0 to about -4. In some embodiments, the a* reflective values range from about -2 to -4. In some embodiments, the a* reflective value is about -2. The b* reflective values near normal angle may range from about 0 to about -5. In some embodiments, the b* reflective value is about -2.5. If the substrates 106, 302, 304 is a low iron glass, the a* and b* reflective values on the film side of coated article 100 may each increase about +1.

[0044] In some embodiments, the a* reflective values near normal angle may range from about - 5 to about -9. In some embodiments, the a* reflective values may range from about -7 to -9. In some embodiments, the a* reflective value is about -7. The b* reflective values near normal angle may range from about 5 to about 11. In some embodiments, the b* reflective value is about 8.

[0045] The coated article 200, 300, when the substrates 106, 302, 304 are float glass, may have a* reflective values at viewing angle of 45 degrees ranging from about -1 to about -6. The coated article 100 may have b* reflective values at viewing angle of 45 degrees ranging from about +2 to about +8. If the substrates 106, 302, 304 are low iron glass, the a* and b* reflective values at viewing angle of 45 degrees may each increase about 1.0. Y / Rfat a viewing angle of 45 degrees may range from about 2.5 to about 3.5. In some embodiments, Y / Rfmay be about 3.3.

[0046] The coated article 200, 300, when the substrates 106, 302, 304 are float glass, may have a* reflective values at viewing angle of 45 degrees ranging from about -5 to about -9. The coated article 100 may have b* reflective values at viewing angle of 45 degrees ranging from about +2 to about +8. In an embodiment when the substrates 106, 302, 304 are low iron glass, the a* and b* reflective values at viewing angle of 45 degrees may each increase about 1.0. Y / Rfat a viewing angle of 45 degrees may range from about 4 to about 5. In some embodiments, Y / Rfmay be about 4.5.

[0047] The coated article 200, 300, when the substrates 106, 302, 304 are float glass, may have a* reflective values at viewing angle of 60 degrees ranging from about +1 to about -2. The coated article 100 may have b* reflective values at viewing angle of 60 degrees ranging from about +2 to about -2. If the substrates 106, 302, 304 are low iron glass, the a* and b* reflective values at viewing angle of 60 degrees may each increase about 1.0. Y / Rfat a viewing angle of 60 degrees may range from about 9.0 to about 11.0. In some embodiments, Y / Rfmay be about 10.3.

[0048] The coated article 200, 300, when the substrates 106, 302, 304 are float glass, may have a* reflective values at viewing angle of 60 degrees ranging from about +1 to about -3. The coated ACTIVE 513648775.1 11BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT article 100 may have b* reflective values at viewing angle of 60 degrees ranging from about +2 to about -2. If the substrates 106, 302, 304 are low iron glass, the a* and b* reflective values at viewing angle of 60 degrees may each increase about 1.0. Y / Rfat a viewing angle of 60 degrees may range from about 10 to about 12. In some embodiments, Y / Rfmay be about 11.

[0049] The coated article 200, 300, when the substrates 106, 302, 304 are float glass, may have a* transmissive values ranging from about 2 to about 0. The coated article 100 may have b* transmissive values ranging from about -1 to about +1. If the substrates 106, 302, 304 are low iron glass, the a* and b* transmissive values may each increase about +1.0.

[0050] Any of the coated articles 100, 200, and 300 may be utilized in an insulated glass unit (IGU). FIG.4 depicts an IGU 400 in accordance with some embodiments of the present disclosure. The IGU 400 includes the substrate 106 having the AR coating 102 disposed on the first surface 104 thereof. The IGU 400 further includes a second substrate 402 and a third substrate 404. The substrate 106 may be disposed between the second substrate 402 and the third substrate 404, where the substrates are separated by spacers 406 therebetween. The second substrate 402 has a first surface 412 facing an exterior environment 413 and a second surface 414 facing the region 408. The first and second surfaces 412, 414 may be known in the art as surface #1 and surface #2, respectively. The third substrate 404 may have a first surface 416 facing the region 410 and a second surface 418 facing an interior environment 420. The first and second surfaces 416, 418 may be known in the art as surface #5 and surface #6, respectively. The substrate 106 has the first surface 104 facing the region 408 and the second surface 108 facing the region 410. The first and second surfaces 104, 108 may be known in the art as surface #3 and surface #4, respectively.

[0051] In the IGU 400, the AR coating 102 is disposed on the first surface 104 (surface #3). The IGU 400 is exemplary and other coatings may be provided on one or more of the remaining surfaces. In some embodiments, and depicted in FIG.400, the IGU 400 may comprise additional coatings 422, 424 on the first surface 416 (surface #5) and on the second surface 414 (surface #2), respectively. The additional coatings 422, 424 may be a low emissivity coating (low-e), an infrared reflective (IRR) coating, or an AR coating. In some embodiments both additional coatings 422, 424 are low-e coatings. In some embodiments, coating 422 is a low-e coating and coating 424 is an IRR coating. These embodiments are merely exemplary, and coatings may be located on other surfaces and / or additional surfaces. For example, a low-e coating may be located on surface #4, or #6 instead of surface #2. ACTIVE 513648775.1 12BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT

[0052] In some embodiments, the coating 422 is a low-e coating and the coating 424 is an IRR coating, where each coating 422, 424 includes one or more silver (Ag)-containing layers. The coatings 422, 424 may include up to 3 Ag-containing layers. In one embodiment, the coating 424 is an IRR coating having 3 Ag-containing layer and being on second surface 414 (surface #2) and the coating 422 is a low-e coating having 1 Ag-containing layer and be present on the first surface 416 (surface #5). Optionally, as shown in Fig.4, additional AR coatings 102 can provided on the first surface 412 (surface #1) and / or the second surface 418 (surface #6) to further improve transmittance in the IGU 400. In some embodiments, the AR coating 102 disposed on the first surface 104 (surface #3), and the additional AR coatings disposed on the first surface 412 (surface#1), and the second surface 418 (surface #6) may use the second combination of layer thickness as discussed below with respect to Fig.5.

[0053] FIG.5 depicts an IGU 500 in accordance with some embodiments of the present disclosure. The IGU 500 is substantially similar to the IGU 400, except further includes AR coating 202 on the second surface 108 (surface #4) of glass substrate 106. IGU 500 is exemplary and may be modified by a skilled artisan as discussed above with respect to IGU 400.

[0054] Without AR coatings 102, 202 on surfaces #3 and #4, surfaces #3 and #4 may contribute monolithically with about 4% of visible reflectance on each side (i.e., Y / R is about 4 for each of surface #3 and surface #4). Due to the lower transmission from the coatings (e.g., IRR and / or low- e) on surfaces #2 and #5, the AR coatings 102, 202 may increase the visible transmission by about 2.5% for IGU 400 (i.e., Y / T of about 2.5) and by about 5% for IGU 500 (i.e., Y / T of about 5).

[0055] In some embodiments, the coating 422 is a low-e coating and the coating 424 is an IRR coating, where each coating 422, 424 includes one or more silver (Ag)-containing layers. The coatings 422, 424 may include up to 3 Ag-containing layers. In one embodiment, the coating 424 is an IRR coating having 3 Ag-containing layer and being on second surface 414 (surface #2) and the coating 422 is a low-e coating having 1 Ag-containing layer and be present on the first surface 416 (surface #5). Optionally, as shown in Fig.4, additional AR coatings 202 may be provided on the first surface 412 (surface #1) and / or the second surface 418 (surface #6) to further improve transmittance in the IGU 500.

[0056] In some embodiments, the AR coatings 102, 202 on the first surface 104 (surface #3) and the second surface 108 (surface #4) may be different. For example, both AR coatings 102, 202 may have the combination of layers discussed above with respect to Figs.1 to 3, but the thicknesses ACTIVE 513648775.1 13BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT of the individual layers may be different. In some embodiments, the AR coating 102 may have a first combination of layer thicknesses of the following: the high index dielectric layer 110 having a thickness of about 8.8 nm to 9.0 nm, the first low index dielectric layer 112 having a thickness of about 34 nm to about 35 nm, the second high index dielectric layer 114 having a thickness of about 89 nm to 93 nm, the medium index dielectric layer 116 having a thickness of about 19 nm to 21 nm, the second low index dielectric layer 118 having a thickness ranging from about 44 nm to about 45 nm, and an overcoat layer 120 ranging in thickness from about 9 nm to 11 nm; and the AR coating 202 may have a second combination of layer thicknesses of the following: the high index dielectric layer 110 having a thickness of about 9.2 nm to 9.4 nm, the first low index dielectric layer 112 having a thickness of about 31 nm to about 32 nm, the second high index dielectric layer 114 having a thickness of about 84 nm to 88 nm, the medium index dielectric layer 116 having a thickness of about 19 nm to 21 nm, the second low index dielectric layer 118 having a thickness ranging from about 51 nm to about 52 nm, and an overcoat layer 120 ranging in thickness from about 9 nm to 11 nm. In some embodiments, the AR coating 102 may have the second combination of layer thicknesses and the AR coating 202 may have the first combination of layer thicknesses. In some embodiments, both the AR coatings 102, 202 may have the second combination of layer thicknesses, or one coating have the first combination of layer thicknesses and the other coating having the second combination of layer thicknesses, and have the following layer sequence: TiOxlayer / SiOxNylayer / NbOxlayer / NbSiOxlayer / SiOxN layery / SiZrOxlayer.

[0057] In some embodiments, the additional AR coatings 202 on the first surface 412 (surface #1) and / or the second surface 418 (surface #6) may use the second combination of layer thicknesses. In some embodiments, all of the AR coatings 102, 202 on surfaces #1, #3, #4, and #6 may use the second combination of layer thicknesses.

[0058] In some embodiments, and not depicted in FIGS. 4-5, the coating 424 may be a low-e coating have up to 3 Ag-containing layers, or 2 Ag-containing layers, or 3 Ag-containing layers. For example, such embodiments make be utilized in cold climates where it is desirable to allow light (e.g., IR radiation, thermal energy) from the exterior environment 413 to penetrate more deeply through the IGU 400, 500 for heating purposes.

[0059] While not wanting to be bound by theory, among the reasons to use the combination of layer thicknesses listed above is to moderate a blue shift when viewing the IGU 500 in a normal direction from the exterior environment 610. For example, when AR coatings 102, 202 are absent ACTIVE 513648775.1 14BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT on the first and second surfaces 104, 108 (i.e., surfaces #3, #4), the b* values may range from about -7.7 to -8.0 b* when viewing the IGU 500 in a normal direction from the exterior environment 610. For example, when both AR coatings 102, 202 have the first combination of layer thicknesses, there may be a blue shift of the b* values to about -9.5 to -10.0. For example, when the AR coating 102 uses the first combination of layer thicknesses and the AR coating 202 uses the second combination of layer thicknesses, or vice versa, or both AR coatings 102, 202 use the second combination of layer thicknesses, the b* values may be about -8.4 to about -8.7, which is a blue shift in comparison to when surfaces #3 and #4 do not have a coating thereon, but less of a blue shift that when both AR coatings 102, 202 use the first combination of layer thicknesses.

[0060] FIG.6 depicts an IGU 600 in accordance with some embodiments of the present disclosure. The IGU 600 includes the substrate 106 having the AR coatings 102, 202 disposed, respectively, on the first and second surfaces 104, 108 thereof. The IGU 600 further includes a second substrate 602, where the substrates 106, 602 are separated by spacers 604 therebetween. The second substrate 602 has a first surface 608 facing an exterior environment 610 and a second surface 612 facing the region 606. The first and second surfaces 608, 612 may be known in the art as surface #1 and surface #2, respectively. The first surface 108 of substrate 106 faces the region 606 and a second surface 108 faces an interior environment 614. The second surface 612 (surface #2) may have a coating layer 616 thereon. In some embodiments, the coating layer 616 may be an infrared reflective (IRR) layer. In some embodiments, the coating layer 616 may be an IRR layer and include up to 3 Ag-containing layers, or 2 Ag-containing layers, or 3 Ag-containing layers. In some embodiments, one of the AR coating 102 or the AR coating 202 may use the first combination of layer thicknesses, and the other of the AR coating 102 or the AR coating 202 may use the second combination of layer thicknesses. In some embodiments, both of the AR coatings 102, 202 may use the second combination of layer thicknesses. Optionally, an additional AR coating 202 may be provided on the first surface 608 (surface #1). In some embodiments the additional AR coating 202 on surface #1 may use the second combination of layer thicknesses.

[0061] FIG.7 depicts an IGU 700 in accordance with some embodiments of the present disclosure. The IGU 700 includes the substrate 106 having the AR coatings 102, 202 disposed, respectively, on the first and second surfaces 104, 108 thereof. The IGU 700 further includes a second substrate 702, where the substrates 106, 702 are separated by spacers 704 therebetween. The second substrate 702 has a first surface 708 facing the region 706 and a second surface 710 facing an ACTIVE 513648775.1 15BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT interior environment 712. The first and second surfaces 708, 710 may be known in the art as surface #3 and surface #4, respectively. The first surface 108 of substrate 106 faces an exterior environment 714 and a second surface 108 faces the region 706. The first surface 708 (surface #3) may have a coating layer 716 thereon. In some embodiments, the coating layer 716 may be a low- e coating. In some embodiments, the coating layer 616 may be a low-e coating layer and include up to 3 Ag-containing layers, or 2 Ag-containing layers, or 3 Ag-containing layers. In some embodiments, one of the AR coating 102 or the AR coating 202 may use the first combination of layer thicknesses, and the other of the AR coating 102 or the AR coating 202 may use the second combination of layer thicknesses. In some embodiments, both of the AR coatings 102, 202 may use the second combination of layer thicknesses. Optionally, an additional AR coating 202 may be provided on the second surface 710 (surface #4). In some embodiments the additional AR coating 202 on surface #4 may use the second combination of layer thicknesses.

[0062] In an exemplary embodiment of the present disclosure, a coated article comprises a substrate having an antireflective (AR) coating disposed on a first surface of the substrate, wherein a second surface of the substrate opposite the first surface does not have an AR coating disposed thereon, and wherein the AR coating comprises, moving away from a first surface of the first glass substrate, a first low index dielectric layer comprising an oxynitride of silicon, a first high index dielectric layer comprising an oxide of niobium, and a second low index dielectric layer comprising an oxynitride of silicon.

[0063] The coated article of the immediately preceding paragraph, wherein the AR coating has only one high index dielectric layer comprising an oxide of niobium.

[0064] The coated article of any of the two preceding paragraph, wherein the first AR coating comprises a second high index dielectric layer disposed between the substrate and the first low index dielectric layer.

[0065] The coated article of any of the three preceding paragraph, wherein the second high index dielectric layer comprises an oxide of titanium.

[0066] The coated article of any of the four preceding paragraph, wherein the AR coating comprises a medium index dielectric layer disposed above the second low index dielectric layer; and an overcoat layer disposed above the medium index dielectric layer.

[0067] The coated article of any of the five preceding paragraph, wherein the medium index dielectric layer comprises an oxide of silicon and an oxide of niobium. ACTIVE 513648775.1 16BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT

[0068] The coated article of any of the six preceding paragraph, wherein the overcoat layer comprises oxide of Zr and Si.

[0069] The coated article of any of the seven preceding paragraph, wherein the overcoat layer comprises an oxide of Zr.

[0070] The coated article of any of the eight preceding paragraph, wherein the AR coating contains no IR reflecting layer based on silver and / or gold.

[0071] The coated article of any of the nine preceding paragraph, wherein the coated article, when viewed from a perspective of the viewer, has a visible reflectance of no greater than 5.3% on the AR coating side of the substrate.

[0072] The coated article of any of the ten preceding paragraph, wherein the coated article has a visible transmission of at least 93%.

[0073] The coated article of any of the eleven preceding paragraph, wherein all layers of the AR coating are transparent dielectric layers.

[0074] The coated article of any of the twelve preceding paragraph, wherein the coated article is not heat treated.

[0075] The coated article of any of the thirteen preceding paragraph, wherein the substrate is a float glass or a low iron glass.

[0076] The coated article of any of the fourteen preceding paragraph, wherein the first high index dielectric layer has a refractive index (n) of at least 2.35 up to 550 nm wavelength, and the first and second low index dielectric layers each have a refractive index (n) of no greater than 1.8 for at least 550 nm wavelength.

[0077] The coated article of any of the fifteen preceding paragraph, where reflectance (Rf), measured over a wavelength range of 380 nm to 780 nm, ranges from about 4.0% to about 10.0%.

[0078] The coated article of any of the sixteen preceding paragraph, wherein Rf, measured over a wavelength range of 450 nm to 675 nm, ranges from about 4.0% to about 6.5%.

[0079] The coated article of any of the seventeen preceding paragraph, wherein Rf, measured at wavelengths over 675 nm, is greater than about 4.5%.

[0080] The coated article of any of the eighteen preceding paragraph, wherein reflectance (Rg), measured over a wavelength range of 380 nm to 780 nm, range from about 4.0% to about 10.0%.

[0081] The coated article of any of the nineteen preceding paragraph, where transmission (T), measured over a wavelength range of 380 nm to 780 nm, ranges from about 82.0% to about 94.0%. ACTIVE 513648775.1 17BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT

[0082] The coated article of any of the twenty preceding paragraph, wherein transmission (Y / T) ranges from about 83.0 to about 95.0.

[0083] The coated article of any of the twenty one preceding paragraph, wherein reflectance (Y / Rf) ranges from about 4.0 to about 9.0.

[0084] The coated article of any of the twenty two preceding paragraph, wherein reflectance (Y / Rg) ranges from about 4.5 to about 8.5.

[0085] The coated article of any of the twenty three preceding paragraph, wherein a* reflective value near normal angle on the coated side range from about 0 to about -2, preferably from about -1 to about -2.

[0086] The coated article of any of the twenty four preceding paragraph, wherein b* reflective values on the film side ranging from about 0 to -2.5.

[0087] The coated article of any of the twenty five preceding paragraph, wherein a* transmissive values on the coated side ranging from about -0.5 to about -1.5. The coated article of any of the twenty six preceding paragraph, wherein b* transmissive values on the coated side ranging from about 0 to about 1.

[0088] The coated article of any of the twenty seven preceding paragraph, wherein a* reflective values on the uncoated side ranging from 1 to about -2.

[0089] The coated article of any of the twenty eight preceding paragraph, wherein b* reflective values on the glass side ranging from about 0 to about -3.

[0090] The coated article of any of the twenty nine preceding paragraphs, wherein the first low index dielectric layer has a thickness of about 20 nm to about 40 nm, wherein the first high index dielectric layer has a thickness of about 75 nm to about 95 nm, wherein the second low index dielectric layer has a thickness of about 40 nm to about 55 nm, wherein the second high index dielectric layer has a thickness of about 5 nm to about 11 nm, wherein the medium index dielectric layer has a thickness of 10 nm to about 30 nm, and where the overcoat layer has a thickness of about 5 nm to about 11 nm.

[0091] The coated article of any of the thirty preceding paragraphs, wherein the second high index dielectric layer comprises an oxide of titanium, wherein the medium index dielectric layer comprises an oxide of niobium and silicon, and wherein the overcoat layer comprises an oxide of silicon and zirconium.

[0092] The coated article of any of the thirty one preceding paragraphs, wherein the first low index ACTIVE 513648775.1 18BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT dielectric layer has a thickness of about 34 nm to about 35 nm, wherein the first high index dielectric layer has a thickness of about 89 nm to about 93 nm, wherein the medium index dielectric layer is about 19 nm to about 21 nm, wherein the second low index dielectric layer has a thickness of about 44 nm to about 45 nm, wherein the second high index dielectric layer has a thickness of about 8.8 nm to about 9.0 nm, and where the overcoat layer has a thickness of about 9 nm to about 11 nm.

[0093] The coated article of any of the thirty two preceding paragraphs, wherein the first low index dielectric layer has a thickness of about 31 nm to about 32 nm, wherein the first high index dielectric layer has a thickness of about 84 nm to about 88 nm, wherein the medium index dielectric layer has thickness of about 19 nm to about 21 nn, wherein the second low index dielectric layer has a thickness of about 51 nm to about 52 nm, wherein the second high index dielectric layer has a thickness of about 9.2 nm to about 9.4 nm, and where the overcoat layer has a thickness of about 9 nm to about 11 nm.The coated article of any of the thirty three preceding paragraphs, wherein the AR coating comprises, moving away from a first surface of the first glass substrate a titanium oxide layer; a first silicon oxynitride layer; a niobium oxide layer; a niobium silicon oxide layer; a second silicon oxide layer; and a silicon zirconium oxide layer or a zirconium oxide layer, wherein the AR coating includes only one niobium oxide layer, and wherein the substrate is a float glass or a low iron glass.

[0094] The coated article of any of the thirty four preceding paragraphs, the titanium oxide layer ranges in thickness from about 5 nm to about 10 nm, the first silicon oxynitride layer ranges in thickness from about 20 nm to about 40 nm, the niobium oxide layer ranges in thickness from about 75 nm to about 95 nm, the niobium silicon oxide ranges in thickness from about 10 nm to about 30 nm, the second silicon oxynitride layer ranges in thickness from about 40 nm to about 55 nm, and the silicon zirconium oxide layer or zirconium oxide layer ranges in thickness from about 9 nm to about 11 nm.

[0095] The coated article of any of the thirty five preceding paragraphs, wherein the titanium oxide layer ranges in thickness from about 8.9 nm to about 9.0 nm, the first silicon oxynitride layer ranges in thickness from about 34 nm to about 35 nm, the niobium oxide layer ranges in thickness from about 89 nm to 93 nm, the niobium silicon oxide layer ranges in thickness from about 19 nm to about 21nm, and the second silicon oxynitride layer ranges in thickness from about 44 nm to about 45 nm. ACTIVE 513648775.1 19BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT

[0096] The coated article of any of the thirty six preceding paragraphs, wherein the titanium oxide layer ranges in thickness from about 9.2 nm to about 9.4 nm, the first silicon oxynitride layer ranges in thickness from about 31 nm to about 32 nm, the niobium oxide layer ranges in thickness from about 84 nm to about 88 nm, the niobium silicon oxide layer ranges in thickness from about 19 nm to about 21 nm, and the second silicon oxynitride layer ranges in thickness from about 51 nm to about 52.

[0097] In an exemplary embodiment of the present disclosure, a coated article comprises a substrate; a first antireflective (AR) coating disposed on a first side of the substrate; and a second AR coating disposed on a second side of the substrate, the second side opposite the first side, wherein the first and second AR coating each comprise, moving away from a first surface of the first glass substrate, a first low index dielectric layer comprising an oxynitride of silicon; a first high index dielectric layer comprising an oxide of niobium; and a second low index dielectric layer comprising an oxynitride of silicon, and wherein, from the perspective of the viewer of the coated article, the first and second AR coatings both have a positive, a neutral, or negative a* reflective value.

[0098] The coated article of the immediately preceding paragraph, wherein each of the first and second AR coatings has only one high index dielectric layer comprising an oxide of niobium.

[0099] The coated article of any of the two preceding paragraph, wherein each of the first and second AR coatings comprise a second high index dielectric layer disposed between the substrate and the first low index dielectric layer.

[0100] The coated article of any of the three preceding paragraph, wherein the second high index dielectric layer comprises an oxide of titanium.

[0101] The coated article of any of the four preceding paragraph, wherein each of the first and second AR coatings comprise a medium index dielectric layer disposed above the second low index dielectric layer; and an overcoat layer disposed above the medium index dielectric layer.

[0102] The coated article of any of the five preceding paragraph, wherein the medium index dielectric layer comprises an oxide of silicon and an oxide of niobium.

[0103] The coated article of any of the six preceding paragraph, wherein the overcoat layer comprises oxide of Zr and Si.

[0104] The coated article of any of the seven preceding paragraph, wherein the overcoat layer comprises an oxide of Zr. ACTIVE 513648775.1 20BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT

[0105] The coated article of any of the eight preceding paragraph, wherein the substrate is a float glass or a low iron glass.

[0106] The coated article of any of the nine preceding paragraph, wherein the substrate further comprises a first substrate having the first side; and a glass substrate having the second side.

[0107] The coated article of any of the ten preceding paragraph, further comprising an adhesive layer disposed between the first and second glass substrates.

[0108] The coated article of any of the eleven preceding paragraph, wherein the first and second substrates are a float glass or a low iron glass.

[0109] The coated article of any of the twelve preceding paragraph, wherein reflectance (Rf), measured over a wavelength range of 380 nm to 780 nm, ranges from about 0.2% to about 11.0%.

[0110] The coated article of any of the thirteen preceding paragraph, wherein Rf, measured over a wavelength range of 450 nm to 675 nm, ranges from about 0.2% to about 2.0%.

[0111] The coated article of any of the fourteen preceding paragraph, wherein Rf, measured at wavelengths over 675 nm, is greater than about 2.0%.

[0112] The coated article of any of the fifteen preceding paragraph, wherein transmission (T), measured over a wavelength range of 440 nm to 650 nm, ranges from about 95.0 % or more.

[0113] The coated article of any of the sixteen preceding paragraph, where transmission (Y / T) ranges from about 96.0 to about 98.0, preferably about 97.2.

[0114] The coated article of any of the seventeen preceding paragraph, wherein reflectance (Y / Rf) ranges from greater than about 1.0 to less than about 1.5, preferably about 1.1 to about 1.2.

[0115] The coated article of any of the eighteen preceding paragraph, wherein a* reflective values near normal angle may range from about 0 to about -4, preferably about -2 to -4.

[0116] The coated article of any of the nineteen preceding paragraph, wherein b* reflective values near normal angle may range from about 0 to about -5, preferably about -2 to about -4.

[0117] The coated article of any of the twenty preceding paragraph, wherein a* reflective values at viewing angle of 45 degrees range from about -1 to about -6.

[0118] The coated article of any of the twenty one preceding paragraph, wherein b* reflective values at viewing angle of 45 degrees range from about +2 to about +8.

[0119] The coated article of any of the twenty two preceding paragraph, wherein reflectance (Y / Rf) at a viewing angle of 45 degrees may range from about 2.5 to about 3.5, preferably about 3.3. ACTIVE 513648775.1 21BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT

[0120] The coated article of any of the twenty three preceding paragraph, wherein a* reflective values at viewing angle of 60 degrees range from about +1 to about -2.

[0121] The coated article of any of the twenty five preceding paragraph, wherein b* reflective values at viewing angle of 60 degrees ranges from about +2 to about -2.

[0122] The coated article of any of the twenty six preceding paragraph, wherein reflectance (Y / Rf) at a viewing angle of 60 degrees ranges from about 9.0 to about 11.0, preferably about 10.3.

[0123] The coated article of any of the twenty seven preceding paragraph, wherein a* transmissive values range from about -2 to about 0.

[0124] The coated article of any of the twenty eight preceding paragraph, wherein b* transmissive values range from about -1 to about +1.

[0125] The coated article of any of the twenty nine preceding paragraphs, wherein, in each of the first and second AR coatings wherein the first low index dielectric layer has a thickness of about 20 nm to about 40 nm, the first high index dielectric layer has a thickness of about 75 nm to about 95 nm, the second low index dielectric layer has a thickness of about 40 nm to about 55 nm, the second high index dielectric layer has a thickness of about 5 nm to about 10 nm, the medium index dielectric layer has a thickness of 10 nm to about 30 nm, and the overcoat layer has a thickness of about 5 nm to about 11 nm.

[0126] The coated article of any of the thirty preceding paragraphs, wherein, in each of the first and second AR coatings the second high index dielectric layer comprises an oxide of titanium, the medium index dielectric layer comprises an oxide of niobium and silicon, and the overcoat layer comprises an oxide of silicon and zirconium.

[0127] The coated article of thirty one preceding paragraphs, wherein, in the first AR coating the first low index dielectric layer has a thickness of about 34 nm to about 35 nm, the first high index dielectric layer has a thickness of about 89 nm to about 93 nm, the medium index dielectric layer is about 19 nm to about 21 nm, the second low index dielectric layer has a thickness of about 44 nm to about 45 nm, the second high index dielectric layer has a thickness of about 8.8 nm to about 9.0 nm, and the overcoat layer has a thickness of about 9 nm to about 11 nm.

[0128] The coated article of any of the thirty two, wherein, in the second AR coating the first low index dielectric layer has a thickness of about 31 nm to about 32 nm, the first high index dielectric layer has a thickness of about 84 nm to about 88 nm, the medium index dielectric layer is about 19 nm to about 21 nm, wherein the second low index dielectric layer has a thickness of about 51 ACTIVE 513648775.1 22BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT nm to about 52 nm, wherein the second high index dielectric layer has a thickness of about 9.2 nm to about 9.4 nm, and where the overcoat layer has a thickness of about 9 nm to about 11 nm.

[0129] The coated article of any of the thirty three, wherein, in the first and second AR coatings the first low index dielectric layer has a thickness of about 31.5 nm to about 35.5 nm, the first high index dielectric layer has a thickness of about 87 nm to about 91 nm, the medium index dielectric layer is about 19 nm to about 21 nm, wherein the second low index dielectric layer has a thickness of about 46 nm to about 50 nm, wherein the second high index dielectric layer has a thickness of about 8.9 nm to about 9.4 nm, and where the overcoat layer has a thickness of about 9 nm to about 11 nm.

[0130] The coated article of any of the thirty four preceding paragraph, wherein the first and second AR coating each comprise, moving away from a first surface of the first glass substrate, a titanium oxide layer; a first silicon oxynitride layer; a niobium oxide layer; a niobium silicon oxide layer; a second silicon oxide layer; and a silicon zirconium oxide layer or a zirconium oxide layer, wherein the AR coating includes only one niobium oxide layer, wherein the substrate is a float glass or a low iron glass, and wherein, from the perspective of the viewer of the coated article, the first and second AR coatings both have a positive, a neutral, or negative a* reflective value.

[0131] The coated article of any of the thirty five preceding paragraphs, wherein the titanium oxide layer ranges in thickness from about 5 nm to about 10 nm, the first silicon oxynitride layer ranges in thickness from about 20 nm to about 40 nm, the niobium oxide layer ranges in thickness from about 75 nm to about 95 nm, the niobium silicon oxide ranges in thickness from about 15 nm to about 25 nm, the second silicon oxynitride layer ranges in thickness from about 40 nm to about 55 nm, and the silicon zirconium oxide layer or zirconium oxide layer ranges in thickness from about 9 nm to about 11 nm.

[0132] The coated article of any of the thirty six preceding paragraphs, wherein, in the first AR coating the titanium oxide layer ranges in thickness from about 8.8 nm to about 9.0 nm, the first silicon oxynitride layer ranges in thickness from about 34 nm to about 35 nm, the niobium oxide layer ranges in thickness from about 89 nm to about 93 nm, the niobium silicon oxide layer ranges in thickness from about 19 nm to about 21 nm, the second silicon oxynitride layer ranges in thickness from about 44 nm to about 45 nm, and the silicon zirconium oxide layer or zirconium oxide layer ranges in thickness from about 9 nm to about 11 nm.

[0133] The coated article of any of the thirty seven preceding paragraphs, wherein, in the second ACTIVE 513648775.1 23BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT AR coating the titanium oxide layer ranges in thickness from about 9.2 nm to about 9.4 nm, the first silicon oxynitride layer ranges in thickness from about 31 nm to about 32 nm, the niobium oxide layer ranges in thickness from about 84 nm to about 88 nm, the niobium silicon oxide layer ranges in thickness from about 19 nm to about 21 nm, the second silicon oxynitride layer ranges in thickness from about 51 nm to about 52 nm, and the silicon zirconium oxide layer or zirconium oxide layer ranges in thickness from about 9 nm to about 11 nm.

[0134] The coated article of any of the thirty eight preceding paragraphs, wherein, in the first and second AR coatings the titanium oxide layer ranges in thickness from about 9.2 nm to about 9.4 nm, the first silicon oxynitride layer ranges in thickness from about 31 nm to about 32 nm, the niobium oxide layer ranges in thickness from about 84 nm to about 88 nm, the niobium silicon oxide layer ranges in thickness from about 19 nm to about 21 nm, the second silicon oxynitride layer ranges in thickness from about 51 nm to about 52 nm, and the silicon zirconium oxide layer or zirconium oxide layer ranges in thickness from about 9 nm to about 11 nm.

[0135] In an exemplary embodiment of the present disclosure, an insulated glass unit (IGU) comprises the coated article of any of the preceding seventy four paragraphs; a second glass substrate; and a third glass substrate, wherein the coated article, the second glass substrate, and the third glass substrate are spaced apart.

[0136] The insulated glass unit (IGU) of the immediately preceding paragraph, wherein the coated article is disposed between the second glass substrate and the third glass substrate.

[0137] The insulated glass unit (IGU) of any of the two preceding paragraphs, wherein the IGU further comprises a first coating disposed on a surface of the second substrate and facing the coated article; and a second coating disposed on a surface of the third substrate and facing the coated articles.

[0138] The insulated glass unit (IGU) of any of the three preceding paragraph, wherein the first and second coating are, independently, one of an infrared reflective coating or a low emissivity coating.

[0139] The IGU of any of the four preceding paragraphs, wherein the first and second coatings comprise up to 3 silver (Ag)-containing layers.

[0140] The IGU of any of the five preceding paragraphs, wherein the first coating comprises 3 Ag-containing layers and the second coating comprises 1 Ag-containing layer.

[0141] In an exemplary embodiment of the present disclosure, an insulated glass unit (IGU) ACTIVE 513648775.1 24BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT comprises the coated article of any of the seventy eight preceding paragraphs; and a second glass substrate, wherein the coated article and the second glass substrate are spaced apart.

[0142] The insulated glass unit (IGU) of any of the immediately preceding paragraph, wherein the IGU further comprises a coating disposed on a surface of the second substrate and facing the coated article.

[0143] The insulated glass unit (IGU) of any of the two preceding paragraph, wherein the coating is one of an infrared reflective coating or a low emissivity coating.

[0144] The IGU of any of the three preceding paragraphs, wherein the coating comprises up to 3 silver (Ag)-containing layers.

[0145] The scope of this disclosure encompasses all changes, substitutions, variations, alterations, and modifications to the example embodiments described or illustrated herein that a person having ordinary skill in the art would comprehend. The scope of this disclosure is not limited to the example embodiments described or illustrated herein. Moreover, although this disclosure describes and illustrates respective embodiments herein as including particular components, elements, feature, functions, operations, or steps, any of these embodiments may include any combination or permutation of any of the components, elements, features, functions, operations, or steps described or illustrated anywhere herein that a person having ordinary skill in the art would comprehend. Furthermore, reference in the appended statements to an apparatus or system or a component of an apparatus or system being adapted to, arranged to, capable of, configured to, enabled to, operable to, or operative to perform a particular function encompasses that apparatus, system, component, whether or not it or that particular function is activated, turned on, or unlocked, as long as that apparatus, system, or component is so adapted, arranged, capable, configured, enabled, operable, or operative. Additionally, although this disclosure describes or illustrates particular embodiments as providing particular advantages, particular embodiments may provide none, some, or all of these advantages. ACTIVE 513648775.1 25

Claims

BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT IN THE CLAIMS 1. A coated article, comprising: a substrate having an antireflective (AR) coating disposed on a first surface of the substrate, wherein a second surface of the substrate opposite the first surface does not have an AR coating disposed thereon, and wherein the AR coating comprises, moving away from a first surface of the first glass substrate: a first low index dielectric layer comprising an oxynitride of silicon; a first high index dielectric layer comprising an oxide of niobium; and a second low index dielectric layer comprising an oxynitride of silicon.

2. The coated article of claim 1, wherein the AR coating has only one high index dielectric layer comprising an oxide of niobium.

3. The coated article of claim 1, wherein the first AR coating comprises: a second high index dielectric layer disposed between the substrate and the first low index dielectric layer.

4. The coated article of claim 3, wherein the second high index dielectric layer comprises an oxide of titanium.

5. The coated article of claim 3, wherein the AR coating comprises: a medium index dielectric layer disposed above the second low index dielectric layer; and an overcoat layer disposed above the medium index dielectric layer.

6. The coated article of claim5, wherein the medium index dielectric layer comprises an oxide of silicon and an oxide of niobium.

7. The coated article of claim 5, wherein the overcoat layer comprises oxide of Zr and Si. ACTIVE 513648775.1 26BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT 8. The coated article of claim 5, wherein the overcoat layer comprises an oxide of Zr.

9. The coated article of claim 1, wherein the AR coating contains no IR reflecting layer based on silver and / or gold.

10. The coated article of claim 1, wherein the coated article, when viewed from a perspective of the viewer, has a visible reflectance of no greater than 5.3% on the AR coating side of the substrate.

11. The coated article of claim 1, wherein the coated article has a visible transmission of at least 93%.

12. The coated article of claim 1, wherein all layers of the AR coating are transparent dielectric layers.

13. The coated article of claim 1, wherein the coated article is not heat treated.

14. The coated article of claim 1, wherein the substrate is a float glass or a low iron glass.

15. The coated article of claim 1, wherein the first high index dielectric layer has a refractive index (n) of at least 2.35 up to 550 nm wavelength, and the first and second low index dielectric layers each have a refractive index (n) of no greater than 1.8 for at least 550 nm wavelength.

16. The coated article of claim 1, where reflectance (Rf), measured over a wavelength range of 380 nm to 780 nm, ranges from about 4.0% to about 10.0%.

17. The coated article of claim 16, wherein Rf, measured over a wavelength range of 450 nm to 675 nm, ranges from about 4.0% to about 6.5%. ACTIVE 513648775.1 27BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT 18. The coated article of claim 17, wherein Rf, measured at wavelengths over 675 nm, is greater than about 4.5%.

19. The coated article of claim 1, wherein reflectance (Rg), measured over a wavelength range of 380 nm to 780 nm, range from about 4.0% to about 10.0%.

20. The coated article of claim 1, where transmission (T), measured over a wavelength range of 380 nm to 780 nm, ranges from about 82.0% to about 94.0%.

21. The coated article of claim 1, wherein transmission (Y / T) ranges from about 83.0 to about 95.

0.

22. The coated article of claim 1, wherein reflectance (Y / Rf) ranges from about 4.0 to about 9.

0.

23. The coated article of claim 1, wherein reflectance (Y / Rg) ranges from about 4.5 to about 8.

5.

24. The coated article of claim 1, wherein a* reflective value near normal angle on the coated side range from about 0 to about -2, preferably from about -1 to about -2.

25. The coated article of claim 1, wherein b* reflective values on the film side ranging from about 0 to -2.

5.

26. The coated article of claim 1, wherein a* transmissive values on the coated side ranging from about -0.5 to about -1.

5.

27. The coated article of claim 1, wherein b* transmissive values on the coated side ranging from about 0 to about 1.

28. The coated article of claim 1, wherein a* reflective values on the uncoated side ACTIVE 513648775.1 28BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT ranging from +1 to about -2.

29. The coated article of claim 1, wherein b* reflective values on the glass side ranging from about 0 to about -3.

30. The coated article of claim 5, wherein the first low index dielectric layer has a thickness of about 20 nm to about 40 nm, wherein the first high index dielectric layer has a thickness of about 75 nm to about 95 nm, wherein the second low index dielectric layer has a thickness of about 40 nm to about 55 nm, wherein the second high index dielectric layer has a thickness of about 5 nm to about 11 nm, wherein the medium index dielectric layer has a thickness of 10 nm to about 30 nm, and where the overcoat layer has a thickness of about 5 nm to about 11 nm.

31. The coated article of claim 30, wherein the second high index dielectric layer comprises an oxide of titanium, wherein the medium index dielectric layer comprises an oxide of niobium and silicon, and wherein the overcoat layer comprises an oxide of silicon and zirconium.

32. The coated article of claim 31, wherein the first low index dielectric layer has a thickness of about 34 nm to about 35 nm, wherein the first high index dielectric layer has a thickness of about 89 nm to about 93 nm, wherein the medium index dielectric layer is about 19 nm to about 21 nm, wherein the second low index dielectric layer has a thickness of about 44 nm to about 45 nm, wherein the second high index dielectric layer has a thickness of about 8.8 nm to about 9.0 nm, and where the overcoat layer has a thickness of about 9 nm to about 11 nm.

33. The coated article of claim 31, wherein the first low index dielectric layer has a ACTIVE 513648775.1 29BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT thickness of about 31 nm to about 32 nm, wherein the first high index dielectric layer has a thickness of about 84 nm to about 88 nm, wherein the medium index dielectric layer has thickness of about 19 nm to about 21 nm, wherein the second low index dielectric layer has a thickness of about 51 nm to about 52 nm, wherein the second high index dielectric layer has a thickness of about 9.2 nm to about 9.4 nm, and where the overcoat layer has a thickness of about 9 nm to about 11 nm.

34. A coated article, comprising: a substrate having an antireflective (AR) coating disposed on a first surface of the substrate, wherein a second surface of the substrate opposite the first surface is uncoated, and wherein the AR coating comprises, moving away from a first surface of the first glass substrate: a titanium oxide layer; a first silicon oxynitride layer; a niobium oxide layer; a niobium silicon oxide layer; a second silicon oxynitride layer; and a silicon zirconium oxide layer or a zirconium oxide layer, wherein the AR coating includes only one niobium oxide layer, and wherein the substrate is a float glass or a low iron glass.

35. The coated article of claim 34, wherein: the titanium oxide layer ranges in thickness from about 5 nm to about 10 nm, the first silicon oxynitride layer ranges in thickness from about 20 nm to about 40 nm, the niobium oxide layer ranges in thickness from about 75 nm to about 95 nm, the niobium silicon oxide ranges in thickness from about 10 nm to about 30 nm, the second silicon oxynitride layer ranges in thickness from about 40nm to about 55 nm, and the silicon zirconium oxide layer or zirconium oxide layer ranges in thickness from about ACTIVE 513648775.1 30BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT 9 nm to about 11 nm.

36. The coated article of claim 35, wherein: the titanium oxide layer ranges in thickness from about 8.9 nm to about 9.0 nm, the first silicon oxynitride layer ranges in thickness from about 34 nm to about 35 nm, the niobium oxide layer ranges in thickness from about 89 nm to 93 nm, the niobium silicon oxide layer ranges in thickness from about 19 nm to about 21nm, and the second silicon oxynitride layer ranges in thickness from about 44 nm to about 45 nm.

37. The coated article of claim 35, wherein: the titanium oxide layer ranges in thickness from about 9.2 nm to about 9.4 nm, the first silicon oxynitride layer ranges in thickness from about 31 nm to about 32 nm, the niobium oxide layer ranges in thickness from about 84 nm to about 88 nm, the niobium silicon oxide layer ranges in thickness from about 19 nm to about 21 nm, and the second silicon oxynitride layer ranges in thickness from about 51 nm to about 52 nm.

38. A coated article, comprising: a substrate; a first antireflective (AR) coating disposed on a first side of the substrate; and a second AR coating disposed on a second side of the substrate, the second side opposite the first side, wherein the first and second AR coating each comprise, moving away from a first surface of the first glass substrate: a first low index dielectric layer comprising an oxynitride of silicon; a first high index dielectric layer comprising an oxide of niobium; and a second low index dielectric layer comprising an oxynitride of silicon, and wherein, from the perspective of the viewer of the coated article, the first and second AR coatings both have a positive, a neutral, or negative a* reflective value.

39. The coated article of claim 38, wherein each of the first and second AR coatings ACTIVE 513648775.1 31BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT has only one high index dielectric layer comprising an oxide of niobium.

40. The coated article of claim 38, wherein each of the first and second AR coatings comprise: a second high index dielectric layer disposed between the substrate and the first low index dielectric layer.

41. The coated article of claim 40, wherein the second high index dielectric layer comprises an oxide of titanium.

42. The coated article of claim 40, wherein each of the first and second AR coatings comprise: a medium index dielectric layer disposed above the dielectric second low index layer; and an overcoat layer disposed above the medium index dielectric layer.

43. The coated article of claim 42, wherein the medium index dielectric layer comprises an oxide of silicon and an oxide of niobium.

44. The coated article of claim 42, wherein the overcoat layer comprises oxide of Zr and Si.

45. The coated article of claim 42, wherein the overcoat layer comprises an oxide of Zr.

46. The coated article of claim 38, wherein the substrate is a float glass or a low iron glass.

47. The coated article of claim 38, wherein the substrate further comprises: a first substrate having the first side; and a glass substrate having the second side. ACTIVE 513648775.1 32BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT 48. The coated article of claim 47, further comprising: an adhesive layer disposed between the first and second glass substrates.

49. The coated article of claim 48, wherein the first and second substrates are a float glass or a low iron glass. 50 The coated article of claim 38, wherein reflectance (Rf), measured over a wavelength range of 380 nm to 780 nm, ranges from about 0.2% to about 11.0%.

51. The coated article of claim 50, wherein Rf, measured over a wavelength range of 450 nm to 675 nm, ranges from about 0.2% to about 2.0%.

52. The coated article of claim 50, wherein Rf, measured at wavelengths over 680 nm, is greater than about 2.0%.

53. The coated article of claim 38, wherein transmission (T), measured over a wavelength range of 440 nm to 650 nm, ranges from about 95.0 % or more.

54. The coated article of claim 38, where transmission (Y / T) ranges from about 96.0 to about 98.0, preferably about 97.

2.

55. The coated article of claim 38, wherein reflectance (Y / Rf) ranges from greater than about 1.0 to less than about 1.5, preferably about 1.1 to about 1.

2.

56. The coated article of claim 38, wherein a* reflective values near normal angle may range from about 0 to about -4, preferably about -2 to -4.

57. The coated article of claim 38, wherein b* reflective values near normal angle may range from about 0 to about -5, preferably about -2 to about -4.

58. The coated article of claim 38, wherein a* reflective values at viewing angle of 45 ACTIVE 513648775.1 33BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT degrees range from about -1 to about -6.

59. The coated article of claim 38, wherein b* reflective values at viewing angle of 45 degrees range from about +2 to about +8.

60. The coated article of claim 38, wherein reflectance (Y / Rf) at a viewing angle of 45 degrees may range from about 2.5 to about 3.5, preferably about 3.

3.

61. The coated article of claim 38, wherein a* reflective values at viewing angle of 60 degrees range from about +1 to about -2.

62. The coated article of claim 38, wherein b* reflective values at viewing angle of 60 degrees ranges from about +2 to about -2.

63. The coated article of claim 38, wherein reflectance (Y / Rf) at a viewing angle of 60 degrees ranges from about 9.0 to about 11.0, preferably about 10.

3.

64. The coated article of claim 38, wherein a* transmissive values range from about -2 to about 0.

65. The coated article of claim 38, wherein b* transmissive values range from about - 1 to about +1.

66. The coated article of claim 42, wherein, in each of the first and second AR coatings: wherein the first low index dielectric layer has a thickness of about 20 nm to about 40 nm, the first high index dielectric layer has a thickness of about 75 nm to about 95 nm, the second low index dielectric layer has a thickness of about 40 nm to about 55 nm, the second high index dielectric layer has a thickness of about 5 nm to about 10 nm, the medium index dielectric layer has a thickness of 10 nm to about 30 nm, and the overcoat layer has a thickness of about 5 nm to about 11 nm. ACTIVE 513648775.1 34BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT 67. The coated article of claim 66, wherein, in each of the first and second AR coatings: the second high index dielectric layer comprises an oxide of titanium, the medium index dielectric layer comprises an oxide of niobium and silicon, and the overcoat layer comprises an oxide of silicon and zirconium.

68. The coated article of claim 67, wherein, in the first AR coating: the first low index dielectric layer has a thickness of about 34 nm to about 35 nm, the first high index dielectric layer has a thickness of about 89 nm to about 93 nm, the medium index dielectric layer is about 19 nm to about 21 nm, the second low index dielectric layer has a thickness of about 44 nm to about 45 nm, the second high index dielectric layer has a thickness of about 8.8 nm to about 9.0 nm, and the overcoat layer has a thickness of about 9 nm to about 11 nm.

69. The coated article of claim 68, wherein, in the second AR coating: the first low index dielectric layer has a thickness of about 31 nm to about 32 nm, the first high index dielectric layer has a thickness of about 84 nm to about 88 nm, the medium index dielectric layer is about 19 nm to about 21 nm, wherein the second low index dielectric layer has a thickness of about 51 nm to about 52 nm, wherein the second high index dielectric layer has a thickness of about 9.2 nm to about 9.4 nm, and where the overcoat layer has a thickness of about 9 nm to about 11 nm.

70. The coated article of claim 67, wherein, in the first and second AR coatings: the first low index dielectric layer has a thickness of about 31.5 nm to about 35.5 nm, the first high index dielectric layer has a thickness of about 87 nm to about 91 nm, the medium index dielectric layer is about 19 nm to about 21 nm, wherein the second low index dielectric layer has a thickness of about 46 nm to about 50 nm, wherein the second high index dielectric layer has a thickness of about 8.9 nm to about 9.4 nm, ACTIVE 513648775.1 35BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT and where the overcoat layer has a thickness of about 9 nm to about 11 nm.

71. A coated article, comprising: a substrate; a first antireflective (AR) coating disposed on a first side of the substrate; and a second AR coating disposed on a second side of the substrate, the second side opposite the first side, wherein the first and second AR coating each comprise, moving away from a first surface of the first glass substrate: a titanium oxide layer; a first silicon oxynitride layer; a niobium oxide layer; a niobium silicon oxide layer; a second silicon oxide layer; and a silicon zirconium oxide layer or a zirconium oxide layer, wherein the AR coating includes only one niobium oxide layer, wherein the substrate is a float glass or a low iron glass, and wherein, from the perspective of the viewer of the coated article, the first and second AR coatings both have a positive, a neutral, or negative a* reflective value.

72. The coated article of claim 71, wherein: the titanium oxide layer ranges in thickness from about 5 nm to about 10 nm, the first silicon oxynitride layer ranges in thickness from about 20 nm to about 40 nm, the niobium oxide layer ranges in thickness from about 75 nm to about 95nm, the niobium silicon oxide ranges in thickness from about 15 nm to about 25 nm, the second silicon oxynitride layer ranges in thickness from about 40 nm to about 55nm, and the silicon zirconium oxide layer or zirconium oxide layer ranges in thickness from about 9 nm to about 11 nm.

73. The coated article of claim 72, wherein, in the first AR coating: ACTIVE 513648775.1 36BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT the titanium oxide layer ranges in thickness from about 8.8 nm to about 9.0 nm, the first silicon oxynitride layer ranges in thickness from about 34 nm to about 35 nm, the niobium oxide layer ranges in thickness from about 89 nm to about 93 nm, the niobium silicon oxide layer ranges in thickness from about 19 nm to about 21 nm, the second silicon oxynitride layer ranges in thickness from about 44 nm to about 45 nm, and the silicon zirconium oxide layer or zirconium oxide layer ranges in thickness from about 9 nm to about 11 nm.

74. The coated article of claim 73, wherein, in the second AR coating: the titanium oxide layer ranges in thickness from about 9.2 nm to about 9.4 nm, the first silicon oxynitride layer ranges in thickness from about 31 nm to about 32 nm, the niobium oxide layer ranges in thickness from about 84 nm to about 88 nm, the niobium silicon oxide layer ranges in thickness from about 19 nm to about 21 nm, the second silicon oxynitride layer ranges in thickness from about 51 nm to about 52 nm, and the silicon zirconium oxide layer or zirconium oxide layer ranges in thickness from about 9 nm to about 11 nm.

75. The coated article of claim 72, wherein, in the first and second AR coatings: the titanium oxide layer ranges in thickness from about 9.2 nm to about 9.4 nm, the first silicon oxynitride layer ranges in thickness from about 31 nm to about 32 nm, the niobium oxide layer ranges in thickness from about 84 nm to about 88 nm, the niobium silicon oxide layer ranges in thickness from about 19 nm to about 21 nm, the second silicon oxynitride layer ranges in thickness from about 51 nm to about 52 nm, and the silicon zirconium oxide layer or zirconium oxide layer ranges in thickness from about 9 nm to about 11 nm.

76. An insulated glass unit (IGU), comprising: the coated article of any of claims 1 to 75; ACTIVE 513648775.1 37BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT a second glass substrate; and a third glass substrate, wherein the coated article, the second glass substrate, and the third glass substrate are spaced apart.

77. The IGU of claim 76, wherein the coated article is disposed between the second glass substrate and the third glass substrate.

78. The IGU of claim 78, wherein the IGU further comprises: a first coating disposed on a surface of the second substrate and facing the coated article; and a second coating disposed on a surface of the third substrate and facing the coated article.

79. The IGU of claim 78, wherein the first and second coating are, independently, one of an infrared reflective coating or a low emissivity coating.

80. The IGU of claim 79, wherein the first and second coatings comprises up to 3 silver (Ag)-containing layers.

81. The IGU of claim 80, wherein the first coating comprises 3 Ag-containing layers and the second coating comprises 1 Ag-containing layer.

82. An insulated glass unit (IGU), comprising: the coated article of any of claims 1 to 75; and a second glass substrate, wherein the coated article and the second glass substrate are spaced apart.

83. The IGU of claim 82, wherein the IGU further comprises: a coating disposed on a surface of the second substrate and facing the coated article.

84. The IGU of claim 83, wherein the coating is one of an infrared reflective coating or ACTIVE 513648775.1 38BB Ref.: 072209.06576 Guardian Ref.: GRD-24013-US-PCT a low emissivity coating.

85. The IGU of claim 84, wherein the coating comprises up to 3 silver (Ag)-containing layers. ACTIVE 513648775.1 39

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