Photoluminescence study of perovskite materials derived from tungsten- and lanthanide-containing aurivillius layered perovskite, Bi2Na0.63Ln0.37Ta1.75W0.25O9

Abstract

Aurivillius layered perovskites are one of the most promising starting materials of a monolayer nanosheet for opening up unique applications of two-dimensional nanomaterials because of a large variety of applicable elements in the perovskite layer. In particular, the wide range of chemical compositions is convenient to explore an effective combination of A- and B-site elements for photoluminescent perovskite nanosheets. In the present study, tungsten- and lanthanide-containing aurivillius layered perovskites, Bi₂Na_0.63Ln_0.37Ta_1.75W_0.25O₉ (Ln = La, Ce, Pr, Nd, Eu, Gd, Tb, Sm, Dy, Ho, Er, Tm, and Yb), were prepared in order to investigate the photoluminescence (PL) associated with Bi³⁺/Ln³⁺-based layered perovskites and monolayer perovskite nanosheets. The comparison of PL spectra for the perovskite nanosheets derived from W-containing (Bi₂Na_0.63Ln_0.37Ta_1.75W_0.25O₉) and non-W-containing aurivillius phase layered perovskite (Bi₂Na_0.5La_0.13Ln_0.37Ta₂O₉) under UV-light illumination (λ_ex. = 280–300 nm) indicated that introducing W into B sites in the perovskite layers resulted in selective energy transfer toward Eu³⁺. Several types of aurivillius layered perovskites were prepared to investigate the degree of inversion symmetry around Eu³⁺ ions.