Strong red emission with excellent thermal stability in double-perovskite type Ba2GdSbO6:Eu3+phosphors for potential field-emission displays

The novel strong red-emitting in double-perovskite type Ba2GdSbO6:Eu3+ phosphors was successfully demonstrated by the simple high-temperature solid-state reaction at 1400 degrees C. The crystal structure was investigated by the X-ray diffraction analysis and further studied via employing the General Structure Analysis System. The chemical purity, surface crystalline function, elemental mapping, energy dispersive X-ray spectroscopy and photoluminescence behaviors were analyzed in detail. The decay curve of the optimized sample was measured with the long lifetime value of 3.51 ms and its microenvironment among doping ions was further investigated by the Judd-Oflet theory. Furthermore, the thermal stability was evaluated, and its emission intensity still remained 79.27% at 483 K. Eventually, the cathodoluminescence (CL) emission spectra exhibited strong emission intensity under low accelerating voltages, suggesting that the red-emitting Ba2GdSbO6:Eu3+ phosphors with excellent thermal stability and strong CL emission intensity could be considered as a promising red-emitting material for field-emission displays. (C) 2020 Elsevier B.V. All rights reserved.