Structure, morphology and optical characterization of Sm3+-doped MgGeO3 nanocrystals for warm white light emitting devices

Abstract

Orange-red emitting Sm[Formula: see text]-doped MgGeO3 phosphors were synthesized by traditional high temperature solid state method. The powders were characterized by using X-ray diffraction (XRD), scanning electron microscope (SEM), energy-dispersive spectrometer (EDS), UV-Vis spectrometer and photoluminescence (PL) spectra. XRD, SEM and EDS analysis results revealed that MGO:Sm phosphor samples were successfully synthesized. and the optimum MGO:0.1% mol Sm[Formula: see text] phosphor exhibited good photoluminescence emission intensity, thermal stability, life time and color purity. The diffuse reflectance spectra give the results of sample absorption, reflectance, transmittance and optical band gap. The larger optical band gap is 5.25 eV and the stronger photoluminescence intensity [Formula: see text] when the doping concentration is 0.1[Formula: see text] mol. The dipole–dipole interaction is the main mechanism of the concentration quenching phenomenon. The thermal activation energy of the sample is 0.176 eV, and the life time of the prepared sample can reach 14.76 [Formula: see text]s, due to the correlated color temperature (CCT) of less than 2000 K, the potential application value in warm white light emitting device.