Patent ID: 6932920

Claim:
An artificial light emitting skin, comprising: an elastic material matrix and crystalline SrAl 2 O 4 :Eu particles that emit light when a mechanical stress generated by an external force is applied thereto and having a mean diameter of 5 nm, the crystalline SrAl 2 O 4 :Eu particles prepared by mixing 0.39 SrCO 3 mol, 0.40 Al 2 O 3 mol, 0.002 Eu 2 O 3 mol, and 0.032 B 2 O 3 mol as source materials in a ball mill for 20 hours, synthesizing the source materials via calcination in oxygen at 1400° C., and reducing thermal treatment in H 2 (4%)-N 2 atmosphere at 1300° C.; a coating agent that coats the surfaces of the crystalline SrAl 2 O 4 :Eu particles, said coating agent including at least one of silane or silica; and wherein the silica and silane coated SrAl 2 O 4 :Eu particles comprise 30% to 80% of the artificial light emitting skin by weight percent, the artificial light emitting skin has a thickness of 0.1 mm and a Young's modulus of 0.0001 MPa, and the artificial light emitting skin emits light detectable by a naked eye when subjected to a compression stress of 0.1 kg/cm 2 .