LAUSR

Abstract The exploration of rare-earth-free phosphors is desirable for white LEDs applications. In this work, Cr 3+ doped Na 2 TiSiO 5 self-activated phosphors were synthesized by conventional solid-state reaction. The electronic structure of Na 2 TiSiO 5 was calculated using density functional theory (DFT) methods. The variations in crystal structure, luminescence properties and thermal stability of Na 2 Ti 1-x SiO 5 : x Cr 3+ were exhaustively investigated by the analysis of XRD patterns, photoluminescence (PL) spectra, diffuse reflection spectra, PL decay curves and temperature-dependent PL spectra. Owing to the red shift of absorption edge and energy transfer between Cr 3+ ions and Ti 4+ ions, the emission intensity and thermal stability of Na 2 TiSiO 5 were improved by the introduction of Cr 3+ ions, and the peak position was red-shifted. The results indicate that the introduction of Cr 3+ ions could be an effective method to regulate the luminescence of Ti 4+ -activated oxide phosphors.