Abstract
A yellowish-orange emitting Sr3SiO5:Eu2+ phosphors were rapidly synthesized by a microwave-assisted sintering method for 50 min with presence of activated carbon. The X-ray diffraction analysis confirmed their tetragonal structure. The SEM images exhibited the irregular morphology with the sizes between 1–3 μm. PLE spectra of Sr3SiO5:Eu2+ exhibited intense and broad band with two dominant peaks of 354 and 396 nm in the ultraviolet region (UV) due to the 4f8→4f75d1 transition of Eu2+ ions. Under the excitation at 396 nm, the PL spectra showed a strong yellowish-orange emission peaking at 575 nm. The optimal concentration of Eu2+ ion was found to be 0.04 mol. The calculated CIE coordinates of 0.04 mol Eu2+ doped Sr3SiO5 were (0.466, 0.486) under the excitation wavelength of 396 nm. The results suggest that microwave-assisted sintering process has considerable potential for synthesis of phosphors due to the decreases of sintering time based on rapid heating without extra reductive agents.
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