Photoluminescence study of perovskite materials derived from tungsten- and lanthanide-containing aurivillius layered perovskite, Bi 2 Na 0.63 Ln 0.37 Ta 1.75 W 0.25 O 9

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, Bi 2 Na 0.63 Ln 0.37 Ta 1.75 W 0.25 O 9 (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 Bi 3+ /Ln 3+ -based layered perovskites and monolayer perovskite nanosheets. The comparison of PL spectra for the perovskite nanosheets derived from W-containing (Bi 2 Na 0.63 Ln 0.37 Ta 1.75 W 0.25 O 9 ) and non-W-containing aurivillius phase layered perovskite (Bi 2 Na 0.5 La 0.13 Ln 0.37 Ta 2 O 9 ) 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 Eu 3+ . Several types of aurivillius layered perovskites were prepared to investigate the degree of inversion symmetry around Eu 3+ ions.