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

• Published in: Journal of luminescence Vol. 223; p. 117126
• Main Authors: Ganesh Kumar, K., Balaji Bhargav, P., Aravinth, K., Arumugam, Raja, Ramasamy, P.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.07.2020
• Subjects: CIE; FESEM; Raman; SrAl2O4:Dy3; TEM; XRD; FESEM; SrAl2O4:Dy3; Raman; XRD; PL; TEM; CIE
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2020.117126

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 crystal structure of the synthesized phosphors is monoclinic 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 can be assigned to 4F9/2 - 6H15/2 transition in blue region when subjected to the ultraviolet excitation of wavelength 347 nm. White light is emitted by combination of red, yellow and blue emissions and is confirmed by CIE chromatic coordinate graph and the probable mechanism responsible for emission of the white light is explained in detail. •Dysprosium activated SrAl2O4 phosphors are synthesized using SSR without adding flux.•Synthesized SrAl2O4:xDy3+ phosphors emitted blue (470 nm), yellow (576 nm), red (646 nm) under UV excitation 347 nm.•The white light emission was confirmed by CIE chromaticity X, Y coordinates.