Tb3+/Sm3+ co-doped double perovskite: synthesis, exfoliation and luminescence properties

Abstract

Tb³⁺/Sm³⁺ co-doped double perovskite K[K_1.5(Tb_1−xSm_x)_0.5]Ta₃O₁₀ (denoted as KKT_1−xS_xTO) was prepared, which exhibited typical Tb³⁺ and Sm³⁺ photoluminescence emissions and tunable colours. After protonation and subsequent exfoliation processes, unilaminar KT_1−xS_xTO nanosheets with a lateral size of ∼300 nm and thickness of ∼2.7 nm were obtained.