Luminescence characteristics of SrZnSO:M (M = Bi3+, Mn2+ and Tb3+) phosphors

Bi 3+ /Tb 3+ /Mn 2+ -activated SrZnSO phosphors were prepared to investigate their luminescence characteristics. The SrZnSO:Bi 3+ , SrZnSO:Mn 2+ and SrZnSO:Tb 3+ phosphors, excited by the NUV/blue light, show blue, orange and green emissions, respectively. The Bi 3+ → Tb 3+ , Tb 3+ → Mn 2+ and Bi 3+ → Mn 2+ energy transfer processes take place in Bi 3+ /Tb 3+ -, Tb 3+ /Mn 2+ -, Bi 3+ /Mn 2+ - and Bi 3+ /Tb 3+ /Mn 2+ -activated SrZnSO phosphors, which result in tunable luminescence of these phosphors. The CIE coordinates were calculated on the basis of the emission spectra, and they reflect the emission color changes of phosphors. For the Bi 3+ /Tb 3+ -, Tb 3+ /Mn 2+ - and Bi 3+ /Mn 2+ - activated SrZnSO phosphors, the emission points are located in the cyan, yellow and white light regions, respectively. For the Bi 3+ /Tb 3+ /Mn 2+ -activated SrZnSO phosphors, the light is in warm white light region.