The light emitting device and lift-off method

A flexible apparatus is provided. The hardness of an adhesive layer of the flexible device is adjusted such that it is higher than the Shore D hardness 70, or preferably higher than or as high as the Shore D hardness 80th The expansion coefficient of a flexible substrate of the flexible device is adjusted such that it is smaller than 58 ppm / ° C, or preferably less than or equal to 30 ppm / ° C.