Adjusting the structure and luminescence properties of Sr Ba MgAl O :Eu phosphors by Sr:Ba ratio.

Europium ion (Eu )-doped phosphors exhibit adjustable photoluminescence due to the sensitivity of their luminescence to the local environment. It is of great significance to adjust the luminescence of Eu by changing their local environment in the host. In this work, we investigated the effect of strontium/barium (Sr:Ba) ratio on the structure and luminescence properties of Sr Ba MgAl O :Eu phosphors. Our investigation indicates that with the decrease of Sr:Ba ratio, the matrix lattice gradually expands and the peak wavelength for the luminescence of Eu presents an obvious blue shift. The occupancy of Eu was analyzed and the reason for the blue shift was explained. Thermal stability for the luminescence of Eu can also be adjusted by changing the Sr:Ba ratio. This work has a positive effect on the regulation of the emission of phosphors and the improvement of thermal stability, which will promote the application of Sr Ba MgAl O :Eu phosphors in the field of white light emitting diodes.