Configurational coordinate diagram of Ni2+ doped silver halide crystals, as determined by optical and luminescence measurements

► Optical and luminescence measurements were carried out on Ni2+ doped silver halide crystals. ► Configurational coordinates of the ground and the first excited state were calculated. ► Optical properties of Ni2+ doped silver halide crystals can be obtained from the configurational coordinate diagram. ► No emission signal was found above 220 K.