Ingredient regulation engineering of samarium(III)-activated double-perovskite niobate matrices

By adjusting the chemical compositions of A and B sites, single Sm3+-activated double-perovskite A2BNbO6 (A = Ca, Sr, and Ba; B = Y and In) phosphors were prepared. Their phase structure and perovskite structure distortion were analyzed. Interestingly, the Ca2YNbO6:Sm3+ phosphors exhibited the strongest emission intensity. After regulating Ca to Sr and Ba compositions, the redshift in the photoluminescence emission spectrum was observed under the charge transfer band excitation. Note that all the obtained samples presented beneficial thermal stability (>62 % at 423 K). Particularly, the Ca2InNbO6:Sm3+ phosphors displayed the highest thermal stability (93.20 % at 423 K). Besides, the luminescence characteristics such as color purity, chromaticity coordinates, luminescence decay curve, etc. were systematically analyzed. This work can provide a valuable database for researchers to find suitable Sm3+-activated double-perovskite frameworks by regulating suitable ingredients.