Dysprosium activated strontium aluminate phosphor: A potential candidate for WLED applications

摘要： A series of dysprosium activated strontium aluminate phosphors (SrAl2O4:xDy3+: x=0.1, 0.2, 0.3, 0.4 and 0.5 %) are prepared by conventional solid state reaction method. The structure of the prepared phosphors is analyzed by XRD, results confirm that the crystallinity of the synthesized phosphors is monoclinic phase with space group P21. Morphology and microstructure of the synthesized phosphors is analyzed using FESEM and TEM analysis respectively. Optical properties are analyzed by using Raman and PL spectra. The characteristic peak observed at 465 cm-1 corresponds to bending mode of O-Al-O bonds in corners sharing with [AlO4]5- tetrahedral. The strongest PL emission band observed at 470 nm is assigned to 4F9/2 - 6H15/2 transition in blue region under the ultraviolet excitation wavelength of 347 nm. White light is formed by combination of these three colors and is confirmed by CIE chromatic coordinate graph and possible responsible mechanism is explained in detail.