Abstract
LiAl 5O 8:Mn 2+ phosphors have been synthesized by combustion process in a short time (<5 min). X-ray diffractogram confirms that the synthesized material consists of LiAl 5O 8 as main phase. Scanning electron microscopy showed angular plate-like crystals with non-uniform shape. The EPR spectra of Mn 2+ ions exhibit resonance signals at g ≈ 4.28 and g ≈ 2.0. The signal at g ≈ 2.0 is due to Mn 2+ ions in an environment close to tetrahedral symmetry, whereas the resonance at g ≈ 4.28 is attributed to the rhombic surroundings of the Mn 2+ ions. The variation of zero-field splitting parameter ( D) with temperature is measured and discussed. The PL spectra exhibit green emission peaks at 505 and 518 nm which are due to the 4T 1 (G) → 6A 1 (S) transition of Mn 2+ ions. The EPR study of LiAl 5O 8:Mn 2+ phosphor gives clear indication of the Mn 2+ ions occupying more than one site in this phosphor.
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