Hydrothermal synthesis and luminescent properties of LixEuxSr1-2xMoO4 red phosphor

LixEuxSr1-2xMoO4 red phosphors were synthesized via a facile hydrothermal method with various reaction time and ion contents of Eu3+ and Li+. As-synthesized samples were characterized by X-ray diffraction (XRD), thermogravimetry (TG), field emission scanning electron microscopy (FE-SEM) and fluorescence spectrophotometry. The XRD results revealed the formation of scheelite-like phosphor structures. The excitation spectra indicated the presence of two main excitation peaks located at 396 and 466 nm, suggesting that this phosphor could be excited well by GaN-based near-UV and blue LED chips. The emission spectra under 466 nm excitation exhibited dominant peaks centered at 614 nm. The influence of reaction time and ions content on the luminescent properties of LixEuxSr1-2xMoO4 was also investigated. The results indicated that reaction time of 48 h was appropriate, and the maximum luminescent intensity was obtained when a molar ratio of 40% ions content was employed.