A method and apparatus for joining multiple layers of materials using an ultrasonic welding apparatus. The invention is a reservoir that incorporates automated means to remove air bubbles from the venous line prior to the blood entering the arterial blood pump. , a container for holding reagents for an automated analyzer. The needle extends through a catheter hub and catheter affixed to the catheter hub. Specifically, an electroluminescent sheet that can be produced at ambient temperature without heating, has high productivity, and can be mass produced at low cost, a method for producing thereof, and a light-emitting composition used therein are provided.