A study on the luminescent properties of new green-emitting terbium-activated CaIn2O4 : xTb phosphors

Calcium indate phosphors have been prepared by solid-state reactions at 1400°C. This indate matrix permits photoluminescence when doped with terbium. It was found that under ultraviolet excitation with a wavelength of 254 nm the phosphors revealed yellowish green luminescence that was attributed to the transitions from 5D4 excited state to 7FJ multiplet ground states of Tb3+ ions. The powder X-ray diffraction, photoluminescence spectra, brightness, fluorescence decay lifetime, and chromatic characteristics of the Tb3+-activated CaIn2O4 phosphors were systematically investigated and reported.