Preparation and luminescence properties of novel K2ZnP2O7: Mn2+ green phosphor

Novel green-emitting phosphors K2Zn1 - xP2O7: x mol% Mn2+ have been successfully prepared using classical solid-state reaction method in air atmosphere, doped by different Mn2+ ion contents, namely x = 0.5, 1, 1.25 and 1.5 mol%. The samples were characterized by the thermogravimetric (ATD/ATG/DSC), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), steady and time-resolved photoluminescence techniques. It was found that all K2Zn1 - xP2O7: x mol% Mn2+ samples crystallize in the tetragonal phase with P4(2)/mnm space group. Upon 425 nm excitation, K2ZnP2O7: Mn2+ exhibits an intense broad green asymmetric emission band peaking at 520 nm, owing to the T-4(1)->(6)A(1)((6) S) transition of Mn2+ ion in K2ZnP2O7. In addition, it is suggested that Mn2+ ions occupy more than one symmetry site in the host K2ZnP2O7. The optimal Mn2+ ion concentration in K2ZnP2O7:Mn2+ phosphor is 1 mol % and with the lifetime 9.81 ms.

Automated summary

A novel green-emitting phosphor K2Zn1-xP2O7: x mol% Mn2+ was successfully prepared and characterized, with the optimal Mn2+ ion concentration determined to be 1 mol% for the longest lifetime.