GLASS FILM AND COMPOSITE SUBSTRATE PREPARED USING THE SAME

摘要

PROBLEM TO BE SOLVED: To create a substrate material that contributes to improvements in the light extraction efficiency of an organic EL element without forming a light extraction layer comprising a sintered body on a glass substrate.SOLUTION: A glass film according to the present invention is 5-500 μm in thickness and has a separate phase structure comprising at least a first phase and a second phase.