Luminescence properties, crystal structure and high thermal stable of (Gd0.85-Lu )2MgTiO6: Eu3+ red phosphors

Abstract A series of double perovskite (Gd0.85-xLux)2MgTiO6: 0.3Eu3+ red phosphors were prepared via a typical high temperature solid-state reaction. XRD and HRTEM exhibits that the phosphors well crystallized as a double perovskite with the space group of P21/n symmetry. The luminescent properties of samples were investigated via excitation and emission spectra. The phosphors emit strong red light and weak orange red light under ultraviolet (UV) and near-UV excitation suggesting that Eu3+ ions situated in the sites without inversion symmetry. The UV–vis spectra included a broad host absorption band assigned to O2--Eu3+ and some peaks at 395 nm, 465 nm and 533 nm attributed to the typical f-f transition of Eu3+. The CIE chromaticity coordinates of all samples were near to the standard red light, indicating that the (Gd0.85-xLux)2MgTiO6: 0.3Eu3+ was a potential candidate material for red emitting phosphors. The decay curves matched with the lines fitted by a one exponential decay formula and the decay time increased with increasing Lu3+-dopant concentration within x