Dion–Jacobson A′MiiiNaNb3O10 (A′ = Rb, Cs; M(iii) = Sm, Bi) and RbSmNa2Nb4O13 layered perovskites and their luminescent function. Issue 39 (20th September 2022)

• Record Type: Journal Article
• Authors: Pal, Sachin; Das, Subrata; Nagarajan, Rajamani; Uma, Sitharaman
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 39(2022)
• Page Start: 14675
• Page End: 14685
• Publication Date: 2022-09-20
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2tc03179e
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : New Dion–Jacobson layered perovskites are possible by the cationic combinations (Sm 3+, Bi 3+, Na + ) in the perovskite blocks and are potential phosphor materials as revealed from the CIE plots of Eu 3+ and Tb 3+ doped samples of RbSmNaNb3 O10 . Abstract : Layered perovskites offer an ideal playground for researchers to tailor their multiple functions through cation and anion modifications; hence, research on them is vigorously pursued. The present study explored multivalent cationic combinations (Sm, Bi, and Na) in the two-dimensional perovskite blocks to realize novel three- and four-layered perovskite oxides belonging to the Dion–Jacobson series. The samples were synthesized by high-temperature solid-state reactions and extensively characterized. The successful structural refinements of the powder X-ray diffraction data by the Rietveld method and Raman spectral measurements confirmed the structural features. Rb analogues of the n = 3 and 4 members, RbM iii NaNb3 O10 (M(iii ) = Sm, Bi) and RbSmNa2 Nb4 O13 exhibit tetragonal symmetry (S. G. P 4/ mmm ). The Cs-based n = 3-member CsM iii NaNb3 O10 (M(iii ) = Sm, Bi) crystallizes in orthorhombic (S. G. Pnam ) symmetry ( a ∼ 30.50, b ∼ 7.70, c ∼ 7.80 Å), highlighting the effect of the bigger (Cs + ) interlayer cations. The facile topochemical ion-exchange reactions of these phases, resulting in H +, Li +, Na +, K +, and [CuCl] + exchanged analogs, have been demonstrated. The UV-visible diffuse reflectance data confirm the f – f electronic transitions of Sm 3+ and oxygen to Bi 3+ charge transfer transitions. The optical bandgaps of these oxides fall in the favorable range (∼3.2–3.5 eV) to explore various photocatalytic reactions. The emission in the red region became intense when it was promoted by the energy transfer from Sm 3+ to Eu 3+, as revealed by the photoluminescence measurements of Eu 3+ doped RbSmNaNb3 O10 . In the Tb-doped RbSmNaNb3 O10 sample, energy transfer from Tb 3+ to Sm 3+ was noticed. These observations were rationalized by an appropriate energy transfer mechanism, reinforcing the applicability of the compounds as potential phosphor materials.