Alkali-free glass panel
The present invention provides an alkali-free glass sheet, including as a glass composition, in terms of mol %, 64% to 71% of SiO 2 , 12.5% to 17% of Al 2 O 3 , 0% to 4% of B 2 O 3 , 0% to 0.5% of Li 2 O+Na 2 O+K 2 O, 6% to 11% of MgO, 3% to 11% of CaO, 0% to 6% of SrO, 0% to 1% of BaO, and 14% to 19% of MgO+CaO+SrO+BaO, and having a mole percent ratio (Al 2 O 3 /CaO)×{B 2 O 3 /(MgO+CaO+SrO+BaO)} of from 0 to 0.5, a mole percent ratio MgO/(CaO+SrO) of from 0.5 to 1.5, a mole percent ratio (MgO+CaO+SrO+BaO—Al 2 O 3 )×B 2 O 3 of from 1 to 10, and a mole percent ratio SiO 2 ×CaO/MgO of from 30 to 90.
1 . An alkali-free glass sheet, comprising as a glass composition, in terms of mol %, 64% to 71% of SiO 2 , 12.5% to 17% of Al 2 O 3 , 0.7% to 4% of B 2 O 3 , 0% to 0.5% of Li 2 O+Na 2 O+K 2 O, 6% to 11% of MgO, 3% to 11% of CaO, 0% to 6% of SrO, 0% to 1% of BaO, 0.001% to 1% of SnO 2 , and 14% to 19% of MgO+CaO+SrO+BaO, having a mole percent ratio (Al 2 O 3 /CaO)×{B 2 O 3 /(MgO+CaO+SrO+BaO)} of from 0 to 0.5, a mole percent ratio MgO/(CaO+SrO) of from 0.5 to 1.5, a mole percent ratio (MgO+CaO+SrO+BaO—Al 2 O 3 )×B 2 O 3 of from 1 to 10, and a mole percent ratio SiO 2 ×CaO/MgO of from 30 to 90, having a strain point of 740° C. or more, and having a liquidus temperature of 1270° C. or less.
2 . The alkali-free glass sheet according to claim 1 , wherein the alkali-free glass sheet has a Young's modulus of 80 GPa or more.
3 . The alkali-free glass sheet according to claim 1 , wherein the alkali-free glass sheet is further substantially free of As 2 O 3 and Sb 2 O 3 .
4 . The alkali-free glass sheet according to claim 1 , wherein the alkali-free glass sheet has a Young's modulus of more than 81 GPa.
5 . The alkali-free glass sheet according to claim 1 , wherein the alkali-free glass sheet has an average thermal expansion coefficient within a temperature range of from 30° C. to 380° C. of from 30×10 −7 /° C. to 50×10 −7 /° C.
6 . The alkali-free glass sheet according to claim 1 , wherein the alkali-free glass sheet has a liquidus viscosity of 10 4.0 dPa·s or more.
7 . An organic light-emitting diode (OLED) device comprising the alkali-free glass sheet according to claim 1 .