A series of NaBaBi(2-x)(PO4)3:xDy3+ eulytite type phosphors with varying doping concentrations were
synthesized using a conventional solid-state reaction. The crystalline nature and phase formation of
the phosphor were confirmed by the PXRD technique. FESEM was used to examine the surface
morphology. UV-DRS measurements were used to quantify the band gap of the host and Dy3+ ion
doped phosphors. The phosphors’ photoluminescence properties were thoroughly investigated.
According to the excitation spectra, these phosphors show a strong absorption band in the near-ultraviolet
(NUV) region, extending from 250 to 450 nm. Under the excitation of 352 nm, the peaks of the
emission spectra of Dy3+ ions are located at 485 nm (blue), 575 nm (yellow) and 666 nm (red),
corresponding to the magnetic dipole 4F9/2→6H15/2 transition, the electric dipole 4F9/2→6H13/2 transition
and the 4F9/2→6H11/2 transition. The optimal concentration of Dy3+ doped phosphor is x = 0.075 and the
major concentration quenching mechanism is accomplished by energy transfer between the
nearest-neighbour ions. The critical transfer distance (Rc) is estimated to be about 19.01. The
Commission International deI’Eclairage (CIE) of NaBaBi1.925(PO4)3:0.075Dy3+ phosphor was calculated
to be (x = 0.341 and y = 0.374), which was very close to the “ideal white” (x = 0.33, y = 0.33). Present
findings suggest that the phosphor might be a viable option for producing a white-light-emitting
phosphor under NUV activation.
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