| abstract |
An electroluminescent fluorescent substance, which is composed of electroluminescent fluorescent particles having an average particle diameter of 0.5 µm to 20 µm and a variation coefficient of particle diameter of 35 % or less, and having at least 50 % have stacking faults arranged in 10 layers or more at intervals of 5 nm or less, the particles containing copper 1 x 10 -4 to I x 10 -2 mol/mol and gold I x 10 -6 to 5 x 10 -4 mol/mol, to the particles; a sheet-shaped electroluminescence device, which has the electroluminescent fluorescent substance; and an electroluminescence device system, which utilizes the sheet-shaped electroluminescence device. |