To provide an AC-driven type electroluminescence element for developing high color purity.

The thin film AC-driven electroluminescence element 10 comprises at least one dielectric layer 18 and a luminous layer 20 on a conductive substrate 12, the luminous layer containing a continuous phase consisting of a first semiconductor and particulates of a second semiconductor having an average particulate size of 10 nm or smaller. Preferably, the band gap of the first semiconductor is wider than the band gap of the particulates of the second semiconductor.