UV-blocking glass compositions for photovoltaic cells and other terrestrial and space applications

Abstract

An ultraviolet light-blocking glass composition that includes: 60-78 mol% SiO2; 1-14 mol% Al2O3; 0-7 mol% MgO; 0-10 mol% CaO; and 0-16 mol% Na2O. The glass composition has a 50% transmission percentage at an ultraviolet wavelength (UV) in the range of 320 nm to 420 nm at a thickness of 50 μm. Further, the glass composition can exhibit an average transmittance of less than 50% over UV wavelengths in the range of 200 nm to 400 nm. In addition, the density of the glass composition can be from 2.35 g / cm3 to 2.60 g / cm3. The composition may also exhibit a coefficient of thermal expansion (CTE) of 3.25 to 8.40 ppm / °C, as measured from 0 °C to 300 °C.

Description

Atorney Docket No. SP24-009PCTUV-BLOCKING GLASS COMPOSITIONS FOR PHOTOVOLTAIC CELLS AND OTHER TERRESTRIAL AND SPACE APPLICATIONSCROSS REFERENCE TO RELATED APPLICATIONS

[0001] This application claims the benefit of priority under 35 U.S.C. § 119 of U.S. Provisional Application No. 63 / 688,369 filed August 29, 2024, the content of which is incorporated herein by reference in its entirety.FIELD OF THE DISCLOSURE

[0002] The present disclosure relates to glass compositions and articles with UV-blocking attributes, and more particularly, UV-blocking glass compositions and articles for use in various applications, including photovoltaic (PV) cells for terrestrial and space applications.BACKGROUND

[0003] Conventional PV modules have been successfully used in various power generation applications. Demand for PV modules remains high, and only appears to be increasing, given the significant reduction in power generation-related emissions associated with this technology as compared to existing methods, e.g., coal and natural gas. But challenges do remain for widespread adoption of PV modules for power generation, including conversion efficiency, cost, and reliability.

[0004] One significant challenge for conventional PV modules is long-term reliability, especially in climate extremes and desired lifetimes that exceed 30 years. The PV cells and structures within these modules work by converting photons of sunlight (e.g., primarily in the 400-700 nm wavelength regime; however, ultraviolet (UV) wavelengths are also present) into electricity directly by using semiconducting materials that exhibit a photovoltaic effect. Photon absorbance efficiency of these PV modules can be improved by outdoor use, e.g., with ground-, rooftop-, and wall-mounted PV module arrangements.

[0005] Nevertheless, these conventional PV modules installed outdoors can experience premature failures and unacceptable reductions in conversion efficiency over their lifetime. Notably, many conventional PV module technologies and components are susceptible to degradation from UV light. In particular, the photovoltaic (PV) structures and polymeric sealing materials employed in the PV modules can degrade from prolonged exposure to UV wavelengths, e.g., from the Sun.Atorney Docket No. SP24-009PCT

[0006] Accordingly, there is a need for UV-blocking glass compositions, which offer improved long-term reliability for PV cells under exposure to various climate conditions, including UV wavelengths from sunlight. There is also a need for UV-blocking glass compositions for use in other terrestrial and space applications subject to substantial UV light exposure, e.g., camera lens covers, PV cells employed in satellites and other space applications, displays for portable electronic devices, etc.SUMMARY

[0007] According to an aspect of the disclosure, an ultraviolet light-blocking glass composition is provided that includes: 60-78 mol% SiCh; 1-14 mol% AI2O3; 0-7 mol% MgO; 0-10 mol% CaO; and 0-16 mol% Na2O. Further, the glass composition has a 50% transmission percentage at an ultraviolet wavelength (UV) in the range of 320 nm to 420 nm at a thickness of 50 pm.

[0008] According to another aspect of the disclosure, an ultraviolet light-blocking glass composition is provided that includes: 60-78 mol% SiCh; 1-14 mol% AI2O3; 0-7 mol% MgO; 0-10 mol% CaO; and 0-16 mol% Na2O. The glass composition has a density from 2.35 g / cm3to 2.60 g / cm3. Further, the glass composition exhibits a coefficient of thermal expansion (CTE) of 5.0 to 8.5 ppm / °C, as measured from 0 °C to 300 °C.

[0009] According to a further aspect of the disclosure, an ultraviolet light-blocking glass composition is provided that includes: 60-78 mol% SiCh; 1-14 mol% AI2O3; 0-7 mol% MgO; 0-10 mol% CaO; 0-16 mol% Na2O; and one or both of 0.5-5 mol% TiO2 and 0.5-3 mol% CeO2. Further, the glass composition has a 50% transmission percentage at an ultraviolet wavelength (UV) in the range of 320 nm to 420 nm at a thickness of 50 pm.

[0010] Additional features and advantages will be set forth in the detailed description which follows, and in part will be readily apparent to those skilled in the art from that description or recognized by practicing the embodiments as described herein, including the detailed description which follows, the claims, as well as the appended drawings.

[0011] It is to be understood that both the foregoing general description and the following detailed description are merely exemplary, and are intended to provide an overview or framework to understanding the nature and character of the claims.Atorney Docket No. SP24-009PCTDETAILED DESCRIPTION

[0012] In the following detailed description, for purposes of explanation and not limitation, example embodiments disclosing specific details are set forth to provide a thorough understanding of various principles of the present disclosure. However, it will be apparent to one having ordinary skill in the art, having had the benefit of the present disclosure, that the present disclosure may be practiced in other embodiments that depart from the specific details disclosed herein. Moreover, descriptions of well-known devices, methods and materials may be omitted so as not to obscure the description of various principles of the present disclosure. Finally, wherever applicable, like reference numerals refer to like elements.

[0013] Ranges can be expressed herein as from “about” one particular value, and / or to “about” another particular value. When such a range is expressed, another embodiment includes from the one particular value and / or to the other particular value. Similarly, when values are expressed as approximations, by use of the antecedent “about,” it will be understood that the particular value forms another embodiment. It will be further understood that the endpoints of each of the ranges are significant both in relation to the other endpoint, and independently of the other endpoint.

[0014] Unless otherwise expressly stated, it is in no way intended that any method set forth herein be construed as requiring that its steps be performed in a specific order. Accordingly, where a method claim does not actually recite an order to be followed by its steps, or it is not otherwise specifically stated in the claims or descriptions that the steps are to be limited to a specific order, it is in no way intended that an order be inferred, in any respect. This holds for any possible non-express basis for interpretation, including: matters of logic with respect to arrangement of steps or operational flow; plain meaning derived from grammatical organization or punctuation; the number or type of embodiments described in the specification.

[0015] As used herein, the singular forms “a,” “an” and “the” include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to a “component” includes aspects having two or more such components, unless the context clearly indicates otherwise.

[0016] In the embodiments of the glass compositions described herein, the concentrations of constituent components (e.g., SiCh, AI2O3, and the like) are specified in mole percent (mol%) on an oxide basis, unless otherwise specified.

[0017] The terms “0 mol%” and “substantially free,” when used to describe the concentration and / or absence of a particular constituent component in a glass composition,Atorney Docket No. SP24-009PCT means that the constituent component is not intentionally added to the glass composition. However, the glass composition may contain traces of the constituent component as a contaminant or tramp in amounts of less than 0.01 mol%.

[0018] The terms “substantial,” “substantially,” and variations thereof as used herein are intended to note that a described feature is equal or approximately equal to a value or description. For example, a “substantially planar” surface is intended to denote a surface that is planar or approximately planar. Moreover, “substantially” is intended to denote that two values are equal or approximately equal. In some embodiments, “substantially” may denote values within about 10% of each other, such as within about 5% of each other, or within about 2% of each other.

[0019] Unless otherwise specified, all compositions are expressed in terms of mole percent (mol%). Coefficients of thermal expansion (CTE) are expressed in terms of ppm / °C and represent a value measured over a temperature range from about 0 °C to about 300 °C, from about 100 °C to about 300 °C, or from about 100 °C to about 500 °C, as specified.

[0020] As used herein, “transmission,” “transmittance,” “optical transmittance,” and “total transmittance” are used interchangeably in the disclosure and refer to external transmission or transmittance, which takes absorption, scattering and reflection into consideration. Fresnel reflection is not factored out of the transmission and transmittance values reported herein. In addition, any total transmittance values referenced over a particular wavelength range (e.g., visible spectrum from 400 nm to 700 nm, UV spectrum from 200 to 400 nm) are given as an average of the total transmittance values measured over the specified wavelength range.

[0021] The viscosity of the glass composition, as described herein, is measured according to ASTM C965-96.

[0022] The term “Vogel-Fulcher-Tamman (‘VFT’) relation,” as used herein, describes the temperature dependence of the viscosity and is represented by the following equation:where r^ is viscosity. To determine VFT A, VFT B, and VFT To, the viscosity of the glass composition is measured over a given temperature range. The raw data of viscosity versus temperature is then fit with the VFT equation by least-squares fitting to obtain A, B, and To. With these values, a viscosity point (e.g., 200 P Temperature, 35000 P Temperature, and 200000 P Temperature) at any temperature above softening point may be calculated.Atorney Docket No. SP24-009PCT

[0023] The term “melting point,” as used herein, refers to the temperature at which the viscosity of the glass composition is 200 poise as measured in accordance with ASTM C338.

[0024] The term “softening point,” as used herein, refers to the temperature at which the viscosity of the glass composition is IxlO7 6poise. The softening point is measured according to the parallel plate viscosity method which measures the viscosity of inorganic glass from 107to 109poise as a function of temperature, similar to ASTM C 135 IM.

[0025] The terms “annealing point” or “effective annealing temperature”, as used herein, refer to the temperature at which the viscosity of the glass composition is IxlO13 18poise. In embodiments, maintaining the glass composition at the effective annealing temperature of the glass composition ± 20 °C for a time greater than or equal to 15 minutes and less than or equal to 1 hour may relieve internal stresses present in accordance with ASTM C598.

[0026] The term “strain point,” as used herein, refers to the temperature at which the viscosity of the glass composition is IxlO1468poise as measured in accordance with ASTM C598.

[0027] Density, as described herein, is measured by the buoyancy method of ASTM C693- 93.

[0028] The term “liquidus viscosity,” as used herein, refers to the viscosity of the glass composition at the onset of devitrification (i.e., at the liquidus temperature as determined with the gradient furnace method according to ASTM C829-81).

[0029] The term “liquidus temperature,” as used herein, refers to the temperature at which the glass composition begins to devitrify as determined with the gradient furnace method according to ASTM C829-81.

[0030] The elastic modulus (also referred to as Young’s modulus) of the glass composition, as described herein, is provided in units of gigapascals (GPa) and is measured in accordance with ASTM C623. Shear modulus of the glass composition, as described herein, is provided in units of gigapascals (GPa). The shear modulus of the glass composition is measured in accordance with ASTM C623. Further, Poisson’s ratio is measured in accordance with ASTM C623.

[0031] Refractive index, as described herein, is measured in accordance with ASTM El 967.

[0032] Generally, the disclosure is directed to glass compositions that provide UV lightblocking characteristics, e.g., a 50% transmission percentage at an ultraviolet wavelength (UV) in the range of 320 nm to 420 nm at a thickness of 50 pm and / or an average transmittanceAtorney Docket No. SP24-009PCT of less than 50% over UV wavelengths in the range of 200 nm to 400 nm. Other properties of the glass compositions of the disclosure can include: a density from 2.35 g / cm3to 2.60 g / cm3and / or a CTE of 3.25 to 8.40 ppm / °C, as measured from 0 °C to 300 °C. In general, the glass compositions reside in the following composition space: 60-78 mol% SiCh; 1-14 mol% AI2O3; 0-7 mol% MgO; 0-10 mol% CaO; and 0-16 mol% Na2O. UV light-blocking dopants employed in the glass compositions include TiCL, CeCE, HO2O3, Fe2O3, and / or NiO. In some aspects, relatively high levels of TiCE and / or CeCE are employed in the composition, resulting in the precipitation of one or more secondary phases of aeschynite and / or rutile, both of which can contribute to the ultimate UV light-blocking characteristics of the composition.

[0033] Advantages of the glass compositions of the disclosure include:(a) improved UV light-blocking relative to the UV light-blocking characteristics of conventional glass compositions in the field of the disclosure (e.g., Corning® Willow® glass);(b) enable extended lifetimes for solar cells (e.g., as employed in satellite applications);(c) manufacturable with existing fusion draw, slot draw and float glass apparatus;(d) exhibit CTE levels that are substantially similar to the CTE levels of conventional glass compositions successfully employed in the various applications contemplated by the disclosure (e.g., solar cells used in terrestrial applications, solar cells used in space and satellite applications, camera lens covers, etc.); and(e) exhibit transmittance levels in the UV spectrum that are substantially similar to those of current and historical conventional glass compositions in the field of the disclosure.

[0034] The glass compositions of the disclosure exhibit one or more of the foregoing advantages. Accordingly, the glass compositions of the disclosure may be used for a variety of applications including, for example: cover glass or glass backplanes in UV-blocking applications (e.g., PV and solar cells employed in space and terrestrial applications); UV- absorbing applications (e.g., cover plates, UV disinfection components, and / or tanning beds); consumer or commercial electronic devices including, for example, LCD and LED displays, computer monitors, and automated teller machines (ATMs); touch screen or touch sensor applications; portable electronic devices including, for example, mobile telephones, personal media players, and tablet computers; for integrated circuit applications including, for example, semiconductor wafers; photovoltaic applications; architectural glass applications; automotive or vehicular glass applications; and commercial or household appliance applications.Atorney Docket No. SP24-009PCT

[0035] In general, the glass compositions of the disclosure may be described as aluminosilicate glass compositions and comprise SiCh, AI2O3, and, in most implementations, a UV-blocking component, such as CeCh, TiCh, HO2O3, Fe2O3, and / or NiO. In addition to SiCh, AI2O3, and at least one UV-blocking component, the glass compositions embodied and described herein can, according to some embodiments, also include alkali oxides, such as Na2O, to enable the ion-exchangeability of the glass composition. More specifically, the glass compositions of the disclosure include: 60-78 mol% SiCh; 1-14 mol% AI2O3; 0-7 mol% MgO; 0-10 mol% CaO; and 0-16 mol% Na2O. The glass compositions can exhibit a 50% transmission percentage at an ultraviolet wavelength (UV) in the range of 320 nm to 350 nm at a thickness of 50 pm and / or a coefficient of thermal expansion (CTE) from 3.25 to 8.40 ppm / °C, as measured from 0 °C to 300 °C.

[0036] In some implementations, the UV light-blocking composition comprises 60-78 mol% SiCh; 1-14 mol% AI2O3; 0-7 mol% MgO; 0-10 mol% CaO; and 0-16 mol% Na2O. According to another implementation, the UV light-blocking composition is substantially boron-free and ion-exchangeable. For example, the foregoing glass composition can further comprise 4-16 mol% Na2O; 0-5 mol% K2O; and one or both of >0-3.5 mol% TiO2 and >0-2.0 mol% CeO2. In the foregoing implementations, the following can serve as UV light-blocking dopants as a substitute for the TiCh and / or CeCh: ZnO, HO2O3, Fe2O3, and / or NiO.

[0037] In some implementations, the UV light-blocking composition is substantially lithium-free, ion-exchangeable, and comprises 60-78 mol% SiO2; 1-14 mol% AI2O3; 0-7 mol% MgO; 0-10 mol% CaO; and 0-16 mol% Na2O. For example, the foregoing glass composition can further comprise 10-16 mol% Na2O; and one or both of >0-3.5 mol% TiO2 and >0-2.0 mol% CeO2. In the foregoing implementations, the following can serve as UV light-blocking dopants as a substitute for the TiO2 and / or CeO2: ZnO, HO2O3, Fe2O3, and / or NiO.

[0038] In some implementations, the UV light-blocking composition is lithium-containing, ion-exchangeable, and comprises 60-78 mol% SiO2; 1-14 mol% AI2O3; 0-7 mol% MgO; 0-10 mol% CaO; and 0-16 mol% Na2O. For example, the foregoing glass composition can further comprise 2-12 mol% Na2O; 4-8 mol% Li2O; 0-3.5 mol% TiO2; and 0-2.0 mol% CeO2. In the foregoing implementations, the following can serve as UV light-blocking dopants as a substitute for the TiO2 and / or CeO2: ZnO, HO2O3, Fe2O3, and / or NiO.Atorney Docket No. SP24-009PCT

[0039] In some implementations, the UV light-blocking composition comprises 60-78 mol% SiCh; 1-14 mol% AI2O3; 0-7 mol% MgO; 0-10 mol% CaO; and 0-16 mol% Na2O. For example, the foregoing glass composition can further comprise 6-10 mol% B2O3; and one or both of >0-3.5 mol% TiCh and > 0-2.0 mol% CeCh. In the foregoing implementations, the following can serve as UV light-blocking dopants as a substitute for the TiCh and / or CeCh: ZnO, HO2O3, Fe2O3, and / or NiO.

[0040] In some implementations, the UV light-blocking composition comprises 60-78 mol% SiO2; 1-14 mol% AI2O3; 0-7 mol% MgO; 5-10 mol% CaO; 10-16 mol% Na2O; 8-12 mol% B2O3; 0.1-5 mol% K2O; and 0-3.5 mol% TiO2. In the foregoing implementations, the following can serve as UV light-blocking dopants as a substitute for the TiO2: CeO2, ZnO, HO2O3, Fe2O3, and / or NiO.

[0041] In some implementations, the UV light-blocking composition is substantially lithium-free, ion-exchangeable, and comprises 60-78 mol% SiO2; 1-14 mol% AI2O3; 0-7 mol% MgO; 0-10 mol% CaO; and 0-16 mol% Na2O. For example, the foregoing glass composition can further comprise 10-16 mol% Na2O; and one or both of >0-3.5 mol% TiO2 and >0-2.0 mol% CeO2. In the foregoing implementations, the following can serve as UV light-blocking dopants as a substitute for the TiO2 and / or CeO2: ZnO, HO2O3, Fe2O3, and / or NiO.

[0042] In some implementations, the UV light-blocking composition comprises 60-78 mol% SiO2; 1-14 mol% AI2O3; 0-7 mol% MgO; 0-10 mol% CaO; 0-16 mol% Na2O; and one or both of 0.5-5 mol% TiO2 and 0.5-3 mol% CeO2. In this implementation, higher levels of TiO2 and / or CeO2 are employed as compared to other implementations. Further, in the foregoing implementations, the following can serve as UV light-blocking dopants as a substitute for the TiO2 and / or CeO2: ZnO, HO2O3, Fe2O3, and / or NiO. Notably, and without being bound by theory, it is believed that the foregoing glass compositions can further comprise a glass matrix and a secondary phase dispersed within the glass matrix, the secondary phase comprising one or both of an aeschynite crystal phase (as derived from CeO2) and a rutile crystal phase (as derived from TiO2).

[0043] In some embodiments of the UV light-blocking composition, at least some cerium (CeCh) is present as a UV absorbing agent. In some embodiments, CeCh is also used in addition to the TiCh. When Ce is used in conjunction with Ti, it was determined that a lower Ce content could be utilized to achieve desirable UV-blocking at a target UV wavelength orAtorney Docket No. SP24-009PCT wavelength range (while maintaining desirable properties including CTE levels comparable to conventional glass compositions, low density for solar panel weight reduction, and / or radiation resistance).

[0044] In embodiments, the UV light-blocking glass composition comprises greater than or equal to 0.1 mol% and less than or equal to 3.5 mol% TiCh, greater than or equal to 0.5 mol% and less than or equal to 3 mol% TiCh, or greater than or equal to 1 mol% and less than or equal to 2.5 mol% TiCh. In embodiments, the glass composition may comprise greater than or equal to 0.2 mol% and less than or equal to 3 mol% TiCh or greater than or equal to 0.5 mol% and less than or equal to 3 mol% TiCh. In embodiments, the concentration of TiCh in the glass composition may be greater than or equal to 0.1 mol%, greater than or equal to 0.25 mol%, greater than or equal to 0.5 mol%, greater than or equal to 0.6 mol%, greater than or equal to 0.7 mol%, greater than or equal to 0.8 mol%, greater than or equal to 0.9 mol%, greater than or equal to 1 mol%, greater than or equal to 1.2 mol%, greater than or equal to 1.4 mol%, greater than or equal to 1.6 mol%, greater than or equal to 1.8 mol%, greater than or equal to 2.0 mol%, greater than or equal to 2.1 mol%, or greater than or equal to 2.5 mol%. In embodiments, the concentration of TiCh in the glass composition may be less than or equal to 3.5 mol%, less than or equal to 3.25 mol%, less than or equal to 3 mol%, less than or equal to 2.75 mol%, less than or equal to 2.5 mol%, or even less than or equal to 2.0 mol%.

[0045] In embodiments, the UV light-blocking glass composition may comprise greater than or equal to 0 mol% and less than or equal to 2.0 mol% CeCh. In embodiments, the glass composition may comprise greater than or equal to 0.1 mol% and less than or equal to 2.0 mol% CeCh, greater than or equal to 0.2 mol% and less than or equal to 1.75 mol% CeCh, or any and all sub-ranges formed from or between any of these endpoints. In embodiments, the concentration of CeCh in the glass composition may be greater than or equal to 0.1 mol%, 0.2 mol%, 0.3 mol%, 0.4 mol%, 0.5 mol%, or even 0.6 mol%. In some embodiments, the concentration of CeCh can be greater than or equal to 0.8 mol%, greater than or equal to 0.9 mol%, greater than or equal to 1.0 mol%, greater than or equal to 1.1 mol%, or even greater than or equal to 1.2 mol%. In embodiments, the concentration of CeCh in the glass composition may be less than or equal to 2.0 mol%, less than or equal to 1.75 mol%, less than or equal to 1.5 mol%, less than or equal to 1.4 mol%, less than or equal to 1.2 mol%, less than or equal to 1 mol%, less than or equal to 0.8 mol%, less than or equal to 0.6 mol%, or even less than or equal to 0.4 mol%.Atorney Docket No. SP24-009PCT

[0046] SiC>2 is the primary glass former of the UV light-blocking glass compositions described herein and may function to stabilize the network structure of the glass compositions. The concentration of SiO2in the glass compositions is generally considered to be high in this field (e.g., greater than or equal to 60 mol%) to provide basic glass forming capability. The upper level of the SiO2content may be slightly limited (e.g., to less than or equal to 78 mol%) to control the melting point of the glass composition, as the melting temperature of pure SiO2or high-SiCh glasses can be undesirably high. Thus, slightly limiting the concentration of SiO2may aid in improving the meltability and the formability of the glass composition. Accordingly, in embodiments, the glass composition may comprise greater than or equal to 60 mol% and less than or equal to 78 mol% SiO2, greater than or equal to 61 mol% and less than or equal to 77 mol% SiO2, greater than or equal to 62 mol% and less than or equal to 78 mol% SiO2, greater than or equal to 63 mol% and less than or equal to 77 mol% SiO2, or any and all sub-ranges formed from any of these endpoints. For example, the SiO2can be set at 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, or 78 mol%, and all SiO2levels between the foregoing values. In embodiments, the glass composition may comprise greater than or equal to 65 mol% and less than or equal to 75 mol% SiO2. In embodiments, the glass composition may comprise greater than or equal to 66 mol% and less than or equal to 74 mol% SiO2.

[0047] Like SiO2, P2Os added to the UV light-blocking glass composition forms the glassy network for which other elements are incorporated. P2Os can be included to decrease the stiffness of the network, induce phase separation, tune the viscosity curve, improve liquidus temperature, or speed up the rate of ion-exchange - depending on the base glass to which it is added. However, if the amount of P2Os is too high then the glass may become difficult to melt to good quality or may too readily phase separate to allow for adequate forming. In embodiments, the glass composition may comprise greater than or equal to 0 mol% and less than or equal to 4 mol% P2Os. In embodiments, the glass composition may comprise greater than or equal to 0.5 mol% and less than or equal to 3 mol% P2Os. In embodiments, the glass composition may comprise greater than or equal to 1 mol% and less than or equal to 2 mol% P2O5.

[0048] Like SiO2, Al2Os may also stabilize the glass network and additionally provides improved mechanical properties and chemical durability to the UV light-blocking glass composition. The amount of Al2Os may also be tailored to control the viscosity and / or phaseAtorney Docket No. SP24-009PCT separation of the glass composition. The concentration of AI2O3 should be sufficiently high (e.g., greater than or equal to 4 mol%) to enable the development of multiple phases through phase separation. However, if the amount of AI2O3 is too high, the viscosity of the melt may increase diminishing the formability of the glass composition. In embodiments, the glass composition may comprise greater than or equal to 1 mol% and less than or equal to 14 mol% AI2O3. In embodiments, the glass composition may comprise greater than or equal to 1.5 mol% and less than or equal to 13 mol% AI2O3. In embodiments, the glass composition may comprise greater than or equal to 2 mol% and less than or equal to 12 mol% AI2O3. In embodiments, the concentration of AI2O3 in the glass composition may be greater than or equal 1 mol% and less than or equal to 13.5 mol%, greater than or equal to 1.25 mol% and less than or equal to 13 mol%, greater than or equal to 1.5 mol% and less than or equal to 12.5 mol%, or any and all sub-ranges formed from or between any of these endpoints.

[0049] In general, the B2O3 levels are limited in the UV light-blocking glass compositions of the disclosure. If B2O3 levels are too high, the chemical durability and liquidus viscosity may suffer and evaporation during melting may be difficult to control. Therefore, the amount of B2O3 may be limited (e.g., less than or equal to 12 mol%, 10 mol%, or 8 mol%) to maintain chemical durability and manufacturability of the glass composition. In other embodiments, the glass compositions of the disclosure are substantially free of B2O3.

[0050] As described hereinabove, the UV light-blocking glass compositions may contain alkali oxides, such as Na2O, to enable the ion-exchangeability of the glass compositions. In addition to aiding in ion exchangeability of the glass composition, Na2O decreases the melting point and improves formability of the glass composition. However, if too much Na2O is added to the glass composition, the melting point may be too low. In embodiments, the glass composition may comprise greater than or equal to 0 mol% and less than or equal to 16 mol% Na2O. In embodiments, the concentration of Na2O in the glass composition may be greater than or equal to 0.1 mol%, greater than or equal to 0.2 mol%, greater than or equal to 0.4 mol%, or even greater than or equal to 0.5 mol%. In embodiments, the concentration of Na2O in the glass composition may be less than or equal to 16 mol%, less than or equal to 14 mol%, less than or equal to 12 mol%, less than or equal to 10 mol%, or even less than or equal to 8 mol%. In embodiments, the concentration of Na2O in the glass composition may be greater than or equal to 0 mol% and less than or equal to 16 mol%, greater than or equal to 0.25 mol% and less than or equal to 15 mol%, greater than or equal to 0.5 mol% and less than or equal toAtorney Docket No. SP24-009PCT14 mol%, greater than or equal to 0.75 mol% and less than or equal to 13 mol%, or any and all sub-ranges formed from or between any of these endpoints.

[0051] The UV light-blocking glass compositions described herein may further comprise alkali metal oxides other than Na2O, such as K2O. K2O can promote ion exchange to increase the depth of compression and decreases the melting point to improve formability of the glass composition. However, adding K2O may cause the surface compressive stress and melting point to be too low. In embodiments, the concentration of K2O in the glass composition may be greater than or equal to 0 mol% to not greater than or equal to 5 mol%. In some embodiments, at least some K2O is present (e.g., > 0 mol%), to not greater than 5 mol%, or any and all sub-ranges formed from either of these endpoints. In some implementations, the concentration of K2O in the glass composition may be greater than or equal to 0 mol% and less than or equal to 5 mol%, greater than or equal to 0 mol% and less than or equal to 4.5 mol%, greater than or equal to 0.1 mol% and less than or equal to 4 mol%, greater than or equal to 0.1 mol% and less than or equal to 3 mol%, or any and all sub-ranges formed from or between any of these endpoints.

[0052] The UV light-blocking glass compositions described herein generally comprise MgO. MgO can lower the viscosity of the glass compositions, which enhances its formability, strain point, and Young’s modulus, and may further improve its ion exchangeability. However, when too much MgO is added to the glass composition, there can be a significant decrease in the diffusivity of sodium and potassium ions in the glass composition which, in turn, adversely impacts the ion exchange performance (i.e., the ability to ion-exchange) of the resultant glass. In embodiments, the concentration of MgO in the glass composition may be greater than or equal to 0 mol%, greater than or equal to 0.25 mol%, greater than or equal to 0.5 mol%, or even greater than or equal to 1 mol%. In embodiments, the concentration of MgO in the glass composition may be less than or equal to 7 mol%, less than or equal to 6 mol%, less than or equal to 5 mol%, or even less than or equal to 2.5 mol%.

[0053] In some embodiments of the UV light-blocking glass compositions, the concentration of MgO in the glass composition is greater than or equal to 1 mol% and not greater than 7 mol%, including any and all sub-ranges formed from or between these endpoints. In some embodiments, the concentration of MgO in the glass composition is greater than or equal to 1.5 mol% and not greater than 6 mol. %, including any and all sub-ranges formed from or between these endpoints. In some embodiments, the concentration of MgO inAtorney Docket No. SP24-009PCT the glass composition is greater than or equal to 1.5 mol % to less than or equal to 7 mol%, greater than or equal to 2 mol% to less than or equal to 6 mol%, or greater than or equal to 2.5 mol% to less than or equal to 5 mol%, including any and all sub-ranges formed from or between any of these endpoints.

[0054] The UV light-blocking glass compositions described herein generally comprise CaO. CaO can lower the viscosity of a glass composition, which enhances its formability, strain point and Young’s modulus, and may improve its ion exchangeability. However, when too much CaO is added to the glass composition, the diffusivity of sodium and potassium ions in the glass composition decreases which, in turn, adversely impacts the ion exchange performance (i.e., the ability to ion-exchange) of the resultant glass. In embodiments, the glass composition may comprise greater than or equal to 0 mol% and less than or equal to 10 mol% CaO, including any and all sub-ranges formed from or between these endpoints. In embodiments, the glass composition may comprise greater than or equal to 0.5 mol% and less than or equal to 10 mol% CaO or greater than or equal to 1 mol% and less than or equal to 9 mol% CaO, including any and all sub-ranges formed from or between these endpoints.

[0055] In embodiments of the UV light-blocking glass compositions, the concentration of CaO may be greater than or equal to 1 mol%, greater than or equal to 1.25 mol%, greater than or equal to 1.5 mol%, or even greater than or equal to 2 mol%. In embodiments, the concentration of CaO in the glass composition may be less than or equal to 10 mol%, less than or equal to 9 mol%, less than or equal to 8 mol%, or even less than or equal to 7.5 mol%.

[0056] The UV light-blocking glass compositions described herein can comprise SrO, e.g., from 0 to 3 mol%. SrO can lower the viscosity of the glass compositions, which enhances its formability, strain point, and Young’s modulus. When replacing other alkaline earth species, SrO can sometimes improve the liquidus viscosity for enhanced manufacturability. However, when too much SrO is added to the glass composition, there can be a significant decrease in the diffusivity of sodium and potassium ions in the glass composition which, in turn, adversely impacts the ion exchange performance (i.e., the ability to ion-exchange) of the resultant glass. In embodiments, the concentration of SrO in the glass composition of the UV light-blocking glass compositions may be greater than or equal to 0 mol%, greater than or equal to 0.25 mol%, greater than or equal to 0.5 mol%, or even greater than or equal to 1 mol%. In embodiments, the concentration of SrO in the UV light-blocking glass compositions may be less than or equal to 3 mol%.Atorney Docket No. SP24-009PCT

[0057] The UV light-blocking glass compositions may contain alkali oxides, such as Li2O, to enable the ion-exchangeability of the glass compositions. In addition to aiding in ion exchangeability of the glass composition, Li2O decreases the melting point and improves formability of the glass composition. However, if too much Li2O is added to the glass composition, the melting point and the liquidus temperature may be too low. In embodiments, the UV light-blocking glass compositions may comprise greater than or equal to 0 mol% and less than or equal to 8 mol% lUO, greater than or equal to 0 mol% and less than or equal to 12 mol% Li2O, or greater than or equal to 0 mol% and less than or equal to 16 mol% lUO. In embodiments, the concentration of lUO in the glass composition may be greater than or equal to 0.1 mol%, greater than or equal to 0.2 mol%, greater than or equal to 0.4 mol%, or even greater than or equal to 0.5 mol%. In embodiments, the concentration of Li2O in the glass composition may be less than or equal to 8 mol%, less than or equal to 6 mol%, less than or equal to 4 mol%, or even less than or equal to 2 mol%.

[0058] In general, the ZnO levels are limited in the UV light-blocking glass compositions of the disclosure. Nevertheless, limited amounts of ZnO can benefit the glass compositions of the disclosure by being added to facilitate or tune desired CTE values. In some implementations, the inclusion of ZnO can replace other alkaline earth oxides to improve the liquidus temperature of the composition and / or improve UV light-blocking performance. Accordingly, ZnO can be included but may be limited, e.g., less than or equal to 2 mol%, less than or equal to 1.75 mol%, less than or equal to 1.5 mol%, less than or equal to 1.25 mol%, or even less than or equal to 1 mol%. In other embodiments, the glass compositions of the disclosure are substantially free of ZnO.

[0059] Also, in general, the HO2O3, Fe2O3 and NiO levels are limited in the UV lightblocking glass compositions of the disclosure. Nevertheless, limited amounts of HO2O3, Fe2O3 and / or NiO can benefit the glass compositions of the disclosure by being added to facilitate or tune desired CTE values. In some implementations, the inclusion of HO2O3, Fe2O3 and NiO can replace other alkaline earth oxides to improve the liquidus temperature of the composition and / or improve UV light-blocking performance. Accordingly, HO2O3 can be included but may be limited, e.g., less than or equal to 0.5 mol%, less than or equal to 0.45 mol%, less than or equal to 0.4 mol%, less than or equal to 0.35 mol%, or even less than or equal to 0.3 mol%. Further, Fe2O can be included but may be limited, e.g., less than or equal to 0.1 mol%, less than or equal to 0.075 mol%, less than or equal to 0.05 mol%, or even less than or equal toAtorney Docket No. SP24-009PCT0.04 mol%. In addition, NiO can be included but may be limited, e.g., less than or equal to 0.025 mol%, less than or equal to 0.020 mol%, less than or equal to 0.018 mol%, less than or equal to 0.015 mol%, or even less than or equal to 0.0125 mol%. In other embodiments, the glass compositions of the disclosure are substantially free of HO2O3, Fe2Os and NiO.

[0060] In embodiments, the UV light-blocking glass compositions described herein can include one or more fining agents. Advantageously, the glass compositions of the disclosure with CeO2 content may not need any additional fining agents, as the CeO2 itself can serve this function. In other embodiments, the fining agents may include, for example, SnO2. In some embodiments, for example, the concentration of SnCh in the glass composition may be greater than or equal to 0 mol%. In embodiments, the concentration of SnCh in the glass composition may be less than or equal to 0.2 mol%, less than or equal to 0.18 mol%, less than or equal to 0.16 mol%, less than or equal to 0.14 mol%, less than or equal to 0.12 mol%, less than or equal to 0.1 mol%, less than or equal to 0.05 mol%, or even less than or equal to 0.01 mol%. In embodiments, the concentration of SnCh in the glass composition may be greater than or equal to 0 mol% and less than or equal to 0.2 mol%, may be greater than or equal to 0 mol% and less than or equal to 0.18 mol%, greater than or equal to 0 mol% and less than or equal to 0.15 mol%, greater than or equal to 0 mol% and less than or equal to 0.1 mol%, greater than or equal to 0 mol% and less than or equal to 0.05 mol%, greater than or equal to 0 mol% and less than or equal to 0.01 mol%, or any and all sub-ranges formed from or between any of these endpoints. In some implementations, the concentration of SnCh may range from 0.05 mol% to 0.2 mol%, from 0.1 mol% to 0.18 mol% or 0.12 mol% to 0.16 mol%. In other embodiments, however, the glass composition may be substantially free of SnCh.

[0061] In embodiments, the UV light-blocking glass compositions described herein may further include tramp materials such as MnO, MoOs, La2Os, CdO, AS2O3, Sb2C>3, sulfur-based compounds, such as sulfates, halogens, or combinations thereof, e.g., each at 0.0 to 0.1 mol%.

[0062] In embodiments, the UV light-blocking glass compositions may have a density greater than or equal to 2.35 g / cm3, greater than or equal to 2.40 g / cm3, or even greater than or equal to 2.45 g / cm3. In embodiments, the glass composition may have a density less than or equal to 2.6 g / cm3, less than or equal to 2.55 g / cm3, less than or equal to 2.5 g / cm3, less than or equal to 2.47 g / cm3, or even less than or equal to 2.45 g / cm3. In embodiments, the glass composition may have a density greater than or equal to 2.35 g / cm3and less than or equal toAtorney Docket No. SP24-009PCT2.5 g / cm3, greater than or equal to 2.35 g / cm3and less than or equal to 2.45 g / cm3, or any and all sub-ranges formed from any of these endpoints.

[0063] According to some embodiments, the UV light-blocking glass composition can exhibit a CTE that substantially matches the CTE of the materials employed in the solar panels in which it serves as a protective cover. The CTE of the glass compositions can range from 3.25 to 8.40 ppm / °C, 7.10 to 7.50 ppm / °C, from 5.00 to 8.50 ppm / °C, or 7.20 to 7.40 ppm / °C, as measured from 100 °C to 300 °C. For example, the CTE of the glass compositions can be 3.25, 3.30, 3.35, 3.40, 3.45, 3.50, 3.55, 3.60, 3.65, 3.70, 3.75, 3.80, 3.85, 3.90, 3.95, 4.00, 4.05,4.10, 4.15, 4.20, 4.25, 4.30, 4.35, 4.40, 4.45, 4.50, 4.55, 4.60, 4.65, 4.70, 4.75, 4.80, 4.85, 4.90,4.95, 5.00, 5.05. 5.10, 5.15. 5.20, 5.25. 5.30, 5.35, 5.40, 5.45, 5.50, 5.55, 5.60, 5.65, 5.70, 5.75,5.80, 5.85, 5.90, 5.95, 6.00, 6.05. 6.10. 6.15. 6.20, 6.25, 6.30, 6.35, 6.40, 6.45, 6.50, 6.55, 6.60,6.65, 6.70, 6.75, 6.80, 6.85, 6.90, 6.95, 7.00, 7.05, 7.10, 7.15, 7.20, 7.25, 7.30, 7.35, 7.40, 7.45,7.50, 7.55, 7.60, 7.65, 7.70, 7.75. 7.80, 7.85, 7.90, 7.95, 8.00, 8.05, 8.10, 8.15, 8.20, 8.25, 8.30,8.35, 8.40 ppm / °C, and any CTE values between the foregoing values, as measured from 100 °C to 300 °C, and within any range between any two of those values.

[0064] According to some embodiments, the glass compositions of the UV light-blocking glass compositions are relatively easy to manufacture on existing glass formation apparatus, e.g., slot draw, fusion draw and float glass apparatus. In some implementations, the glass compositions can exhibit a liquidus temperature of less than 1125 °C, less than 1115 °C, or even less than 1100 °C, as measured internally in a gradient boat after 24 hours. For example, the glass compositions can exhibit a liquidus temperature of 1125 °C, 1120 °C, 1115 °C, 1110 °C, 1105 °C, 1100 °C, 1075 °C, 1050 °C, 1025 °C, or even as low as 1000 °C, as measured internally in a gradient boat after 24 hours.

[0065] The UV light-blocking glass compositions generally exhibit a 50% transmission cutoff in the UV wavelength range, e.g., from 200 to 400 nm and as measured at a thickness of 50 pm. That is, the glass compositions can exhibit an average transmission level of less than or equal to 50% in the UV wavelength range, e.g., from 200 to 400 nm, as measured at a thickness of 50 pm. In some implementations, the glass compositions exhibit a 50% transmission cutoff in the range of 320 to 350 nm, as measured in an article with the composition having a thickness of 50 pm. In some embodiments, the glass compositions can exhibit a 50% transmission cutoff in the range of 340 to 350 nm at an article thickness of 50 pm. For example, the glass compositions can exhibit a 50% transmission cutoff at UVAtorney Docket No. SP24-009PCT wavelengths of 300 nm, 305 nm, 310 nm, 315 nm, 320 nm, 325 nm, 330 nm, 335 nm, 340 nm, 345 nm, or even 350 nm, and all wavelengths between the foregoing wavelengths, as measured at an article thickness of 50 gm. Further, according to some implementations, the glass composition exhibits a 50% transmission percentage at a UV wavelength in the range of 320 nm to 350 nm at a thickness of 50 pm.

[0066] In embodiments, the glass composition may have a liquidus viscosity greater than or equal to 5 kP, greater than or equal to 50 kP, greater than or equal to 100 kP, or even greater than or equal to 115 kP. In embodiments, the UV light-blocking glass composition may have a liquidus viscosity less than or equal to 133 kP, less than or equal to 100 kP, less than or equal to 75 kP, less than or equal to 50 kP, less than or equal to 20 kP, or even less than or equal to 10 kP.

[0067] In embodiments, the UV light-blocking glass compositions may have a liquidus viscosity less than or equal to 780 kP, less than or equal to 700 kP, less than or equal to 600 kP, less than or equal to 500 kP, less than or equal to 400 kP, less than or equal to 300 kP, less than or equal to 200 kP, or even less than or equal to 100 kP. In embodiments, the glass composition may have a liquidus viscosity greater than or equal to 31 kP and less than or equal to 780 kP, greater than or equal to 100 kP and less than or equal to 500 kP, greater than or equal to 150 kP and less than or equal to 350 kP, greater than or equal to 31 kP and less than or equal to 250 kP, or any and all sub-ranges formed from any of these endpoints. These ranges of viscosities allow the glass compositions to be formed into sheets by a variety of different techniques including, without limitation, fusion forming, slot draw, floating (e.g., float glass processes), rolling, and other sheet-forming processes known to those in the art.EXAMPLES

[0068] Various embodiments of the glass compositions of the outer glass layer of the PV modules of the disclosure will be further clarified by the following examples.Examples 1A-1L - UV light-blocking boron-free, ion-exchangeable glass compositions

[0069] In this example, UV light-blocking glass compositions (designated Exs. 1A-1L, as listed in Table 1) have been melted according to the methods of the disclosure. The compositions in Table 1 are classified as boron-free, ion-exchangeable (i.e., they have intentional levels of alkali metal oxide(s)) compositions. Batch materials were mixed in appropriate quantities and melted in a covered platinum crucible for 6 hours at 1625 °C in a gas-fired furnace before pouring into water. The glass was then combined with residual glassAtorney Docket No. SP24-009PCT that had been left in the crucible. All glass was then ball-milled back into powder, and remelted at 1650 °C for 12 hours before being poured onto a steel plate as a large patty. Selected properties associated with these glass compositions have been presented in Table 1, including density, CTE, and viscosity. Further, the 50% transmission cutoff wavelengths are provided for some of these glass compositions, measured at thicknesses of 200, 400 and 600 pm.TABLE 1 - UV light-blocking boron-free, ion-exchangeable glass compositionsAtorney Docket No. SP24-009PCTTABLE 1 continued - UV light-blocking boron-free, ion-exchangeable glass compositions* Not intentionally addedExamples 2A-2K - UV light-blocking, ion-exchangeable glass compositions

[0070] In these examples, UV light-blocking glass compositions of the disclosure (designated Exs. 2A-2F, as listed in Table 2A; and Exs. 2G-2K, as listed in Table 2B) have been melted according to the methods of the disclosure. The compositions in Tables 2A and 2B are classified as ion-exchangeable (i.e., they have intentional levels of alkali metal oxide(s)) lithium-free and lithium-containing compositions. Batch materials were mixed in appropriate quantities and melted in a covered platinum crucible for 6 hours at 1625 °C in a gas-fired furnace before pouring into water. The glass was then combined with residual glass that had been left in the crucible. All glass was then ball-milled back into powder, and remelted atAtorney Docket No. SP24-009PCT1650 °C for 12 hours before being poured onto a steel plate as a large patty. Selected properties associated with these glass compositions have been presented in Tables 2 A & 2B, including density, CTE, and viscosity. Further, the 50% transmission cutoff wavelengths are provided for some of these glass compositions, measured at thicknesses of 200, 400 and 600 pm.TABLE 2A - UV light-blocking lithium-free ion-exchangeable glass compositions* Not intentionally added** Not measuredAtorney Docket No. SP24-009PCTTABLE 2B - UV light-blocking lithium, ion-exchangeable glass compositions* Not intentionally added** Not measuredExamples 3 A-3E - UV light-blocking, alkali-free glass compositions

[0071] In this example, UV light-blocking glass compositions of the disclosure (designated Exs. 3 A-3E, as listed in Table 3) have been melted according to the methods of the disclosure. The compositions in Table 3 are classified as alkali-free compositions. Batch materials wereAtorney Docket No. SP24-009PCT mixed in appropriate quantities and melted in a covered platinum crucible for 6 hours at 1625 °C in a gas-fired furnace before pouring into water. The glass was then combined with residual glass that had been left in the crucible. All glass was then ball-milled back into powder, and remelted at 1650 °C for 12 hours before being poured onto a steel plate as a large patty. Selected properties associated with these glass compositions have been presented in Table 3, including density, CTE, and viscosity. Further, the 50% transmission cutoff wavelengths are provided for some of these glass compositions, measured at thicknesses of 100, 200, 400 and 600 pm.TABLE 3 - UV light-blocking alkali-free glass compositionsAtorney Docket No. SP24-009PCT| cutoff wavelength (nm) |* Not intentionally added** Not measuredExamples 4A-4F - UV light-blocking, soda lime glass compositions

[0072] In this example, UV light-blocking glass compositions of the disclosure (designated Exs. 4A-4F, as listed in Table 4) have been melted according to the methods of the disclosure. The compositions in Table 4 are classified as soda lime glass (SLG) compositions. Batch materials were mixed in appropriate quantities and melted in a covered platinum crucible for 6 hours at 1625 °C in a gas-fired furnace before pouring into water. The glass was then combined with residual glass that had been left in the crucible. All glass was then ball-milled back into powder, and remelted at 1650 °C for 12 hours before being poured onto a steel plate as a large patty. Selected properties associated with these glass compositions have been presented in Table 4, including density, CTE, and viscosity. Further, the 50% transmission cutoff wavelengths are provided for some of these glass compositions, measured at thicknesses of 200, 400 and 600 pm.TABLE 4 - UV light-blocking soda lime glass compositionsAtorney Docket No. SP24-009PCT* Not intentionally added** Not measured

[0073] The various features described in the specification may be combined in any and all combinations, for example, as listed in the following embodiments.

[0074] Embodiment 1. According to Embodiment 1, an ultraviolet light-blocking glass composition is provided that includes: 60-78 mol% SiCE; 1-14 mol% AI2O3; 0-7 mol% MgO; 0-10 mol% CaO; and 0-16 mol% Na2O. Further, the glass composition has a 50% transmission percentage at an ultraviolet wavelength (UV) in the range of 320 nm to 420 nm at a thickness of 50 pm.

[0075] Embodiment 2. The glass composition of Embodiment 1 is provided, wherein the glass composition exhibits an average transmittance of less than 50% over UV wavelengths in the range of 200 nm to 400 nm.

[0076] Embodiment 3. The glass composition of Embodiment 1 is provided, wherein the glass composition is substantially boron-free and ion-exchangeable.

[0077] Embodiment 4. The glass composition of Embodiment 3 is provided, further comprising: 4-16 mol% Na2O; 0-5 mol% K2O; and one or both of >0-3.5 mol% TiCE and >0- 2.0 mol% CeCE.

[0078] Embodiment 5. The glass composition of Embodiment 1 is provided, wherein the glass composition is substantially lithium-free and ion-exchangeable.

[0079] Embodiment 6. The glass composition of Embodiment 5 is provided, further comprising: 10-16 mol% Na2O; and one or both of >0-3.5 mol% TiCE and >0-2.0 mol% CeCE.

[0080] Embodiment 7. The glass composition of Embodiment 1 is provided, wherein the glass composition is lithium-containing and ion-exchangeable.

[0081] Embodiment 8. The glass composition of Embodiment 7 is provided, further comprising: 2-12 mol% Na2O; 4-8 mol% Li2O; 0-3.5 mol% TiCE; and 0-2.0 mol% CeCE.

[0082] Embodiment 9. The glass composition of Embodiment 1 is provided, further comprising: 6-10 mol% B2O3; and one or both of >0-3.5 mol% TiCE and >0-2.0 mol% CeCE, wherein the glass composition is substantially free of alkali metal oxides.Atorney Docket No. SP24-009PCT

[0083] Embodiment 10. The glass composition of Embodiment 1 is provided, further comprising: 5-10 mol% CaO; 8-12 mol% B2O3; 10-16 mol% Na?O; 0.1-5 mol% K2O; and 0- 3.5 mol% TiCE.

[0084] Embodiment 11. According to Embodiment 11, an ultraviolet light-blocking glass composition is provided that includes: 60-78 mol% SiCh; 1-14 mol% AI2O3; 0-7 mol% MgO; 0-10 mol% CaO; and 0-16 mol% Na2O. The glass composition has a density from 2.35 g / cm3to 2.60 g / cm3. Further, the glass composition exhibits a coefficient of thermal expansion (CTE) of 3.25 to 8.40 ppm / °C, as measured from 0 °C to 300 °C.

[0085] Embodiment 12. The glass composition of Embodiment 11 is provided, wherein the glass composition exhibits a liquidus viscosity of 2 kP to 3000 kP.

[0086] Embodiment 13. The glass composition of Embodiment 11 is provided, further comprising: 4-16 mol% Na2O; 0-5 mol% K2O; and one or both of >0-3.5 mol% TiCh and >0- 2.0 mol% CeCE.

[0087] Embodiment 14. The glass composition of Embodiment 11 is provided, further comprising: 10-16 mol% Na2O; and one or both of >0-3.5 mol% TiCE and >0-2.0 mol% CeCE, wherein the glass composition is substantially lithium-free and ion-exchangeable.

[0088] Embodiment 15. The glass composition of Embodiment 11 is provided, further comprising: 2-12 mol% Na2O; 4-8 mol% Li2O; 0-3.5 mol% TiCE; and 0-2.0 mol% CeCE, wherein the glass composition is lithium-containing and ion-exchangeable.

[0089] Embodiment 16. The glass composition of Embodiment 11 is provided, further comprising: 6-10 mol% B2O3; and one or both of >0-3.5 mol% TiCE and >0-2.0 mol% CeCE, wherein the glass composition is substantially free of alkali metal oxides.

[0090] Embodiment 17. The glass composition of Embodiment 11 is provided, further comprising: 5-10 mol% CaO; 8-12 mol% B2O3; 10-16 mol% Na2O; 0.1-5 mol% K2O; and 0- 3.5 mol% TiO2.

[0091] Embodiment 18. According to Embodiment 18, an ultraviolet light-blocking glass composition is provided that includes: 60-78 mol% SiO2; 1-14 mol% AI2O3; 0-7 mol% MgO; 0-10 mol% CaO; 0-16 mol% Na2O; and one or both of 0.5-5 mol% TiO2 and 0.5-3 mol% CeO2. Further, the glass composition has a 50% transmission percentage at an ultraviolet wavelength (UV) in the range of 320 nm to 420 nm at a thickness of 50 pm.

[0092] Embodiment 19. The glass composition of Embodiment 18 is provided, wherein the glass composition further comprises a glass matrix and one or more secondary phases dispersedAtorney Docket No. SP24-009PCT within the glass matrix, the one or more secondary phases comprising one or both of an aeschynite crystal phase and a rutile crystal phase.

[0093] Embodiment 20. The glass composition of Embodiment 1 is provided, wherein the glass composition exhibits an average transmittance of less than 50% over UV wavelengths in the range of 200 nm to 400 nm.

Claims

Atorney Docket No. SP24-009PCTCLAIM(S)What is claimed is:

1. An ultraviolet light-blocking glass composition, comprising:60-78 mol% SiO2;1-14 mol% AI2O3;0-7 mol% MgO;0-10 mol% CaO; and0-16 mol% Na2O, wherein the glass composition has a 50% transmission percentage at an ultraviolet wavelength (UV) in the range of 320 nm to 420 nm at a thickness of 50 pm.

2. The glass composition of claim 1, wherein the glass composition exhibits an average transmittance of less than 50% over UV wavelengths in the range of 200 nm to 400 nm.

3. The glass composition of claim 1 or claim 2, wherein the glass composition is substantially boron-free and ion-exchangeable.

4. The glass composition of claim 3, further comprising:4-16 mol% Na2O;0-5 mol% K2O; and one or both of >0-3.5 mol% TiO2and >0-2.0 mol% CeO2.

5. The glass composition of claim 1 or claim 2, wherein the glass composition is substantially lithium-free and ion-exchangeable.

6. The glass composition of claim 5, further comprising:10-16 mol% Na2O; and one or both of >0-3.5 mol% TiO2and >0-2.0 mol% CeO2.

7. The glass composition of claim 1 or claim 2, wherein the glass composition is lithium- containing and ion-exchangeable.

8. The glass composition of claim 7, further comprising:Atorney Docket No. SP24-009PCT2-12 mol% Na20;4-8 mol% Li20;0-3.5 mol% TiCh; and0-2.0 mol% CeCh.

9. The glass composition of claim 1, further comprising:6-10 mol% B2O3; and one or both of >0-3.5 mol% TiCh and >0-2.0 mol% CeCh, wherein the glass composition is substantially free of alkali metal oxides.

10. The glass composition of claim 1 or claim 2, further comprising:5-10 mol% CaO;8-12 mol% B2O3;10-16 mol% Na2O;0.1-5 mol% K2O; and0-3.5 mol% TiC>2.

11. An ultraviolet light-blocking glass composition, comprising:60-78 mol% SiO2;1-14 mol% AI2O3;0-7 mol% MgO;0-10 mol% CaO; and0-16 mol% Na2O, wherein the glass composition has a density from 2.35 g / cm3to 2.60 g / cm3, and wherein the glass composition exhibits a coefficient of thermal expansion (CTE) of 3.25 to 8.40 ppm / °C, as measured from 0 °C to 300 °C.

12. The glass composition of claim 11, wherein the glass composition exhibits a liquidus viscosity of 2 kP to 3000 kP.

13. The glass composition of claim 11 or claim 12, further comprising:4-16 mol% Na2O;Atorney Docket No. SP24-009PCT0-5 mol% K2O; and one or both of >0-3.5 mol% TiCh and >0-2.0 mol% CeCh.

14. The glass composition of claim 11 or claim 12, further comprising:10-16 mol% Na?O; and one or both of >0-3.5 mol% TiCh and >0-2.0 mol% CeCh, wherein the glass composition is substantially lithium-free and ion-exchangeable.

15. The glass composition of claim 11 or claim 12, further comprising:2-12 mol% Na?O;4-8 mol% Li2O;0-3.5 mol% TiCh; and0-2.0 mol% CeCh, wherein the glass composition is lithium-containing and ion-exchangeable.

16. The glass composition of claim 11 or claim 12, further comprising:6-10 mol% B2O3; and one or both of >0-3.5 mol% TiCh and >0-2.0 mol% CeCh, wherein the glass composition is substantially free of alkali metal oxides.

17. The glass composition of claim 11 or claim 12, further comprising:5-10 mol% CaO;8-12 mol% B2O3;10-16 mol% Na2O;0.1-5 mol% K2O; and0-3.5 mol% TiC>2.

18. An ultraviolet light-blocking glass composition, comprising:60-78 mol% SiO2;1-14 mol% AI2O3;0-7 mol% MgO;0-10 mol% CaO;0-16 mol% Na2O; andAtorney Docket No. SP24-009PCT one or both of 0.5-5 mol% TiCh and 0.5-3 mol% CeCh, wherein the glass composition has a 50% transmission percentage at an ultraviolet wavelength (UV) in the range of 320 nm to 420 nm at a thickness of 50 pm.

19. The glass composition of claim 18, wherein the glass composition further comprises a glass matrix and one or more secondary phases dispersed within the glass matrix, the one or more secondary phases comprising one or both of an aeschynite crystal phase and a rutile crystal phase.

20. The glass composition of claim 1, wherein the glass composition exhibits an average transmittance of less than 50% over UV wavelengths in the range of 200 nm to 400 nm.

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