Luminescence properties and applications of Ce3+-activated Lu3Mg2GaSi2O12 yellow-green emission garnet phosphors

Ce3+-doped Lu3Mg2GaSi2O12 (LMGS) yellow-green phosphors were synthesized by a high-temperature solidstate reaction method for 3 h. The optical properties and crystal structure of the obtained samples were characterized by spectral analysis and Rietveld refinement, respectively. The emission spectra excited by 460 nm exhibit broad yellow-green emission bands from 525 to 535 nm (having short redshift with increasing Ce3+ concentration). At 423 K, the emission intensity of the LMGS: 0.0015Ce3+ phosphor decreases to 81.94% of that at room temperature, and the activation energy is approximately 0.153 eV. The samples presented good water resistance. Finally, we packaged the obtained green phosphors and commercial red phosphors Sr2Si5N8: Eu2+ with a blue LED chip. The color-rendering index and correlated color temperature of the packaged w-LED under 460 nm excitation were 84.2 and 4034, respectively. All the above results indicate that the LMGS: Ce3+ samples have great potential for applications in w-LEDs.