NASICON-type Na_3.6Lu_1.8−x(PO₄)₃:xEu³⁺ phosphors: structure and luminescence

Abstract

Na3.6Lu1.8-x(PO4)3:xEu3+ phosphors were synthesized by high-temperature solid-state reaction. Powder X-ray diffraction study revealed that homogeneous solid solutions with a NASICON-type structure were formed at 0 ≤ x ≤ 0.7. The...

Influence of Sc substitution on the structure and properties of NASICON-type Na3Sc2−xRx(PO4)3 (R = Eu, Tb, Dy) phosphors

“…Such behavior is also observed for NASICON-type NLP:xEu 3+ compounds 32 and requires more sensitive techniques and deeper X-ray diffraction analysis of Lu-and Sc-based phosphates with this structure type. A broad intensive charge transfer band (CTB) with the maximum at 220 nm (5.64 eV) arising due to the 2pO-4fEu charge transfer transitions dominates in the PLE spectrum of the NSP:0.1Eu 3+ phosphor (Fig.…”

“…Its position coincides with the one obtained for NLP:0.5Eu 3+ and NYP:0.7Eu 3+ . 30,32 The PLE spectrum of NSP:0.1Eu 3+ also contains a set of excitation lines peaked at 287 (4.32), 300 (4.14), 321 (3.87), 364 (3.41), 377 (3.29), 382 (3.25), 395 (3.14) and 467 (2.66) nm (eV), which are ascribed to the f-f transitions of Eu 3+ (Fig. 7a).…”

Sunlight-activated Eu3+-doped CaNaSb2O6F yellow-orange long-persistence luminescence material

“…56,[68][69][70] Furthermore, the peak at 586 nm did not split, indicating that only one site exists in the host, further confirming the previous proposed conclusion that Eu 3+ replaces the Ca 2+ /Na + lattice site. 71 Moreover, in the CNSOF host, the SbO 6 octahedron forms a tunnel network structure through common vertices, and Eu 3+ in these tunnels through replacing Ca 2+ /Na + is more conducive to isolating luminescent ions, thereby weakening the interaction among Eu 3+ ions (cross relaxation). Therefore, the emission intensity of Eu 3+ at the high excited state energy level is equal to that at the lowest excited state in a certain range of concentration, resulting in the yellow-orange emission of Eu 3+ in the CNSOF host.…”

Temperature dependent energy transfer to Eu3+ emission centres in K5Eu(MoO4)4 crystals

“…4 However, it has to be taken into account that temperature behaviour of the Eu 3+ emission may be different for different excitation energies, as has recently been demonstrated for phosphate and molybdate based phosphors. [25][26][27][28] Another factor, which must be taken into account when emission thermal stability is considered, is the efficiency of energy transfer from the MoO 4 2− oxyanion to Eu 3+ . To the best of our knowledge, the dependence of thermal stability of the Eu 3+ emission on excitation energy has not been studied for KEMO so far.…”