RARE-EARTH-CONTAINING GLASS MATERIAL AND SUBSTRATE AND DEVICE COMPRISING SUCH SUBSTRATE

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A rare-earth-containing glass material having a composition, expressed in mole percentages on an oxide basis, comprising : SiO2 : 66-75 Al2O3 : 11-17 B2O3 : 0-4 MgO : 1-6.5 CaO : 2-7 SrO : 0-4 BaO : 0-4 Y2O3 : 0-4 La2O3 : 0-4 Y2O3+La2O3 : 0.1-4. The inclusion Of Y2O3 and/or La2O3 in the composition reduces the T2.3 of the glass thereby allowing higher annealing-point glasses to be produced. The glass is particularly useful for low-temperature polycrystalline silicon-based semiconductor devices.