Abstract
Ce3+ doped K3LuF6 powders have been successfully elaborated via high-temperature solid state method. The structural and luminescent properties of these cryolite-type K3LuF6:xCe3+ (x = 0.03, 0.05, 0.07, 0.10 and 0.13) phosphors have been investigated into detail. The results indicate that all phases belong to the monoclinic system with P21/n space group and lattice parameters a = 6.295 (4) Å, b = 6.497 (5) Å, c = 8.992 (6) Å, β = 90.91 (3) ° for x = 0.05. Ce3+ is considered to substitute for Lu3+ in the octahedral [LuF6] sites. Under UV light excitation at 307 nm, the photoluminescence spectra of the samples present one broad band centered around 432 nm which belongs to the purplish-blue region. The color coordinates of this phase are calculated to (0.1565, 0.0956). The influence of Ce3+ content on the luminescence properties is also established and the concentration quenching mechanism is due to dipole-quadrupole Ce3+-Ce3+ interactions in K3LuF6:Ce3+.
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