One embodiment of the present invention relates to ionic liquids and ionic viscoelastics formed between 1 a small molecule or macromolecule containing two or more cations; and 2 a small molecule or macromolecule containing two or more anions. On the undoped InP buffer layer, a Mg-doped p-type InP cladding layer, an InGaAsP optical confinement layer, an InGaAsP MQW active layer, an n-type InGaAsP optical confinement layer, and an n-type InP cladding layer are successively stacked. The indicia is encoded to represent the information born on the card. A reverse-deflection wedge prism can be provided between each switching prism and its corresponding transverse-translation prism. The present invention provides a transparent plastic composite material that is remarkably improved in abrasion resistance and anti-peeling properties.