| 摘要 |
PROBLEM TO BE SOLVED: To provide a substrate which is capable of enhancing light extraction efficiency of an organic EL element without forming a light extraction layer made of a sintered compact and is excellent in productivity.SOLUTION: A crystalline glass substrate is used as a substrate material and is applied to organic EL lighting. The crystalline glass substrate has a glass composition which contains, by mass, 55-73% SiO, 17-27% AlO, 2-5% LiO, 0-1.5% MgO, 0-1.5% ZnO, 0-1% NaO, 0-1% KO, 0-3.8% TiO, 0-2.5% ZrO, and 0-0.6% SnO. The contents of AsOand SbOare both preferably less than 0.1 mass%. The crystalline glass substrate preferably has a thickness of 2.0 mm or less. |
