A method for manufacturing MAl2O4:Eu,RE type long-lasting phosphor ceramics that is capable of producing the ceramics at a reduced raw material cost. The OLED display device includes a substrate; a first electrode disposed on the substrate and including a reflective layer; an organic layer disposed on the first electrode and including a white emission layer and a hole injection layer having a thickness between 200 and 300 \u212b; and a second electrode disposed on the organic layer. The binder structure preferably ranges from a non-uniform matrix of binder formed by heat-deformed binder particles, to a clump of binder particles generally retaining the original shape or the binder particles, to non-continuous connectors of binder between active particles.