Double perovskite CaSrMSbO6(M = La, Gd, Y): Bi3+ phosphors for multifunctional application

Abstract

Bi³⁺-doping luminescent materials have recently evoked considerable interest in versatile applications. In this work, we have developed a series of Bi³⁺-activated CaSrMSbO₆(M = La, Gd, Y) phosphors with double perovskite structures, exhibiting blue emission from 350 nm to 500 nm. The emission spectral position and intensity of Bi³⁺ ions can be tuned by changing excitation wavelength and doping concentrations. The relationship between the local crystal field environment and the luminescence properties is comprehensively analyzed. Importantly, optical temperature properties of CaSrLaSbO₆: Bi³⁺ were investigated and were found to reach a maximum relative sensitivity of 4.57 % K⁻¹ at 298 K. Furthermore, the anti-counterfeiting ink was prepared using CaSrLaSbO₆: Bi³⁺ phosphors, and it showed tunable emission under different light stimulation. These results indicate that CaSrLaSbO₆: Bi³⁺ phosphors have application potential in optical temperature sensing and anti-counterfeiting.