There is provided an organic light-emitting device obtained by using a specific copper coordination compound as a light-emitting material, which has a basic structure in which two copper ions are crosslinked in a ring form by one of atomic groups containing a halogen atom, a sulfur atom, and an nitrogen atom. In another aspect, an improved spreader mechanism that automatically starts and stops the feed of material from a storage container in conjunction with the distribution of material therefrom. The light devices may be changed with each other for changing the damaged light devices with the new ones.