Abstract
Red phosphors NaLa1−x Mg0.92Ca0.08WO6:xSm3+ (x = 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, and 0.07) were synthesized by a conventional solid-state reaction route. The XRD patterns, photoluminescence spectra, ultraviolet–visible reflection spectroscopy, decay time and the CIE chromaticity coordinates of these compounds were characterized and analyzed. The emission spectra of the NaLaMg0.92Ca0.08WO6:Sm3+ phosphors consisted of some sharp emission peaks of Sm3+ ions centered at 563, 601, and 646 nm. The strongest one is located at 646 nm due to 4G5/2–6H9/2 transition of Sm3+, generating bright red light. The optimum dopant concentration of Sm3+ ions in NaLaMg0.92Ca0.08WO6:Sm3+ is 6 mol%. The CIE chromaticity coordinates of the NaLaMg0.92Ca0.08WO6:Sm3+ phosphors were located in the red region. The NaLaMg0.92Ca0.08WO6:Sm3+ phosphors may be potentially used as red phosphors for white light-emitting diodes and displays.
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