Luminescence Properties of Rare Earth Sm3+ Doped Ca2Mg2Al28O46 Phosphor for white light emitting diode

The luminescence characteristics of Ca₂Mg₂Al₂₈O₄₆ doped with rare earth Sm³⁺ produced through combustion synthesis. To investigate the luminescence characteristics, the phosphors photoluminescence (PL) spectra were also obtained. The PL spectra show significant orange-red emission at 567 nm and 614 nm for the produced materials using a 405 nm excitation, which is attributable ⁴G_5/2→⁶H_5/2 and⁴G_5/2→⁶H_7/2 transition of rare earth Sm³⁺.The optimum concentration of Sm³⁺ ions in Ca₂Mg₂Al₂₈O₄₆ was discovered to be 1.5 mole %, above which concentration quenching was observed. The colour coordinates of Sm³⁺ doped Ca₂Mg₂Al₂₈O₄₆ phosphor are (x,y) of (0.532, 0.467) and (0.677, 0.322). All of these results point to the suitability of Ca₂Mg₂Al₂₈O₄₆ phosphor doped with Sm³⁺ ions for display and w-LED.