Synthesis and Optical Properties of Novel Red-Emitting PbNb2O6: Eu3+ Phosphors

Abstract

Undoped and PbNb2O6:Eu(3+) (1.0 ≤ x ≤ 6.0 mol%) phosphors were synthesized at 1100 °C for 3.5 h by the conventional solid state reaction method. Synthesized PbNb2O6:Eu(3+) phosphors were characterized by X-ray diffraction (XRD), Scanning electron microscopy (SEM), Energy dispersive spectroscopy (EDS) and Photoluminescence (PL) analyses. The PL spectra showed series of excitation peaks between 350 and 430 nm due to the 4f-4f transitions of Eu(3+). For 395.0 nm excitation, emission spectra of Eu(3+) doped samples were observed at 591 nm (orange) and 614 nm (red) due to the (5)D0 → (7)F1 transitions and (5)D0 → (7)F2 transitions, respectively. PL analysis results also showed that the emission intensity increased by increasing Eu(3+) ion content. No concentration quenching effect was observed. The CIE chromaticity color coordinates (x,y) of the PbNb2O6:Eu(3+) phosphors were found to be in the red region of the chromaticity diagram.

Synthesis, structural characterization, and photoluminescence properties of TTB‐type PbTa2O6:Eu3+ phosphor

“…The luminescence spectra of Eu 3+ ion usually presents broad band with the emission color varying from ultraviolet to red depending on the different host materials. Trivalent europium ion usually have two dominant emission bands: one is in the orange region (585‐600 nm) due to 5 D 0 → 7 F 1 transition and the other is in the red region (610‐630 nm) corresponding to the 5 D 0 → 7 F 2 transition …”

“…7 F 2 transition. 5,6 Regarding the lead tantalate (PbTa 2 O 6 ), there are some works on structural, dielectric, optical, and ferroelectric properties. [7][8][9][10] Structural characterization of PbTa 2 O 6 was discussed by these studies.…”

Influence of europium doping on the crystallization, morphology, and the cathodoluminescent properties of PbNb2O6:Eu3+ phosphors

“…The shift between the two polymorphs was also studied by absorption analysis, which is given in Figure 7. PL host absorption for rhombohedral PbNb2O6 has been previously reported around 385 nm (17), but it was not clearly observed in the same spectral range. The absorption peaks of the Eu 3+ doped PbNb2O6 and undoped PbNb2O6 samples are around 370-375 nm.…”

“…The synthesis, structural, and optical properties of several AB2O6-type niobate compounds have been investigated (17)(18)(19)(20)(21). Among the leadbased niobates, PbNb2O6 ceramics have been studied recently for their photocatalytic (22), dielectric and piezoelectric (23), ferroelectric (24)(25)(26)(27)(28)(29), and thermal properties (30).…”

“…Among the leadbased niobates, PbNb2O6 ceramics have been studied recently for their photocatalytic (22), dielectric and piezoelectric (23), ferroelectric (24)(25)(26)(27)(28)(29), and thermal properties (30). Furthermore, lhan et al (17,18) investigated the photoluminescence properties of rhombohedral PbNb2O6:Eu 3+ phosphor, as well as the thermoluminescence kinetic parameters, Judd-Ofelt analysis and radioluminescence properties of orthorhombic PbNb2O6:Eu 3+ phosphor.…”