Highly efficient and water-resistant K3ZrF7:Mn4+ red-emitting phosphors

Optical enhancement of highly efficient organic–inorganic oxyfluoride red phosphors via the cation co-doping strategy

“…41 The relationship between log( I / x ) and log( x ) shown in Fig. 1e was obtained using eqn (3) and the simplified equation (eqn (4)), which can be fitted to a straight line with a slope of −1.13 (− θ /3): 42 where I and x are the photoluminescence intensity and the Mn 4+ concentration, respectively. k and β are constants.…”