Infrared-to-visible up-conversion material, and infrared light identification elements comprising same

摘要

An infrared-to-visible up-conversion material which can be applied to an infrared light identification element having a useful conversion efficiency and sensitivity for infrared light in the wavelengths of the 1.5 µm band, 0.98 µm band and 0.8 µm band without necessity for previous excitation, comprises an inorganic material comprising at least two elements of erbium (Er) and a halogen or compounds thereof.