Nearly pure red up-conversion emission of Ba4Bi3F17: Ln3+ with 1550 nm wavelength excitation by controlling the doping ions

Abstract

Ba4Bi3F17 is one of the excellent host materials for high-efficient up-conversion luminescence (UCL), but it is still challenging to obtain high-purity red emission via lanthanide doping. In this work, nearly pure red emission was achieved in the Er3+/Tm3+ and Er3+/Ho3+-doped Ba4Bi3F17 matrix by using a 1550 nm laser diode (LD). In order to improve the UCL intensity, optical-inert ions Li+ or Na+ were doped into the system. Meanwhile, red-to-green luminescent intensity ratio was also enhanced. On basis of the analysis of the dependence of UCL intensities as a function of the excitation power and energy level of Ln3+, all possible red emission mechanisms were discussed.