Combustion Synthesized Europium Doped LaAl11O18 Phosphors—An Electron Paramagnetic Resonance and Optical Study
By adopting a facile solution combustion synthesis, crystallized europium doped blue phosphors were successfully prepared. These phosphors were characterized by X-ray diffraction (XRD), Fourier transform infrared absorption (FT-IR), energy dispersive analysis of X-ray, Electron Paramagnetic Resonance (EPR) and Photoluminescence (PL) experimental methods. The photoluminescence spectrum indicates Eu2+ and Eu3+ ions in these phosphors. The band at around 442 nm is attributed to the spin-allowed 4f65d1(2D)→4f7(8S7/2) transition of Eu2+ ions. The sharp bands at 591 (5D0 → 7F1) and 616 (5D0 → 7F2) nm are attributed to the spin-forbidden transitions of Eu3+ ions. The EPR spectra of as-prepared and post-treated LaAl11O18:Eu phosphors exhibit signals characteristic of La2+ and Eu2+ ions. The number of spins, Gibbs energy, magnetic susceptibility, Curie constant and effective magnetic moment values were calculated and compared at 296 and 110 K.
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Document Type: Research Article
Publication date: January 1, 2016
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