Abstract
Abstract Green phosphors such as Sr5-3(x+y)/2CexTbyB3O9F (x = 0.1, y = 0.4) and Sr5-x-y-zCexTbyNazB3O9F (x = 0.1, y = 0.4, z = 0.1, 0.4, 0.5) were prepared via solid-state reactions. The X-ray diffraction patterns of the obtained phosphors were examined to properly index their peak positions. Enhanced photoluminescence (PL) excitation and emission spectra were observed when Na+ and Ce3+ were co-doped into the Sr5B3O9F:Tb3+ phosphors. An intense green light due to the prepared phosphors was observed in the emission spectra upon near-ultraviolet (NUV) excitation. Scanning electron microscopy (SEM) images of the luminescent particles were obtained and the green emission light of a Sr4Ce0.1Tb0.4Na0.5B3O9F phosphor was compared to that of commercially available green phosphate and silicate phosphors. The thermal quenching of such phosphor occurred at 298–448 K. In addition, the internal quantum efficiency, color rendering index, correlated color temperature, and Commission Internationale de l’Eclairage coordinates were characterized for the Sr4Ce0.1Tb0.4Na0.5B3O9F phosphor using a 365 nm LED chip.
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