Synthesis, Luminescence and Energy Transfer Properties of Ce3+/Mn2+ Co-Doped Calcium Carbodiimide Phosphors

Ce3+-doped and Ce3+/Mn2+ co-doped calcium carbodiimide (CaCN2) phosphors were synthesized from doped carbonate carbon nitride by a solid-state reaction at 700 °C under flowing NH3 using very short time (1 h). The samples characterized powder X-ray diffraction, scanning electron microscopy their diffuse reflectance luminescence properties investigated. Single-doped CaCN2:Ce3+ exhibits blue emission near-ultraviolet activation (386 nm) corresponding to the 5d1 → 2F5/2 2F7/2 transitions of Ce3+. Maximum is obtained temperatures lower than 150 K then progressively decreases up 387 K, with an 80% drop in room temperature. Efficient energy transfers Ce3+ Mn2+ via non-radiative dipole–dipole mechanism are evidenced for samples, leading various colored nm). color can be modulated red through shade white depending on sensitizer/activator ratio.