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

Tb3+/Sm3+ co-doped double perovskite K[K1.5(Tb1-xSmx)0.5]Ta3O10 (denoted as KKT1-xSxTO) was prepared, which exhibited typical Tb3+ and Sm3+ photoluminescence emissions and tunable colours. After protonation and subsequent exfoliation processes, unilaminar KT1-xSxTO nanosheets with a lateral size of ∼300 nm and thickness of ∼2.7 nm were obtained.