Abstract
The aluminate phosphors LiAl5O8:Ce; NaAl11O17:Ce were synthesized by combustion synthesis. Photoluminescence (PL) and thermoluminescence (TL) characteristics of the phosphors have been reported in this paper. The Photoluminescence (PL) emission spectra of the LiAl5O8:Ce phosphors show strong Ce3+ emission at around 310nm for the excitation at wavelength of 254nm and in NaAl11O17:Ce emission is at 350nm for the excitation at 254nm wavelength of light due to the 5d→4f transition. The TL glow curves of the LiAl5O8:Ce and NaAl11O17:Ce materials show a single peak at 245°C and 255°C respectively, indicating single type of trapping sites due to γ-irradiated effect. The relative intensities of the peaks are found to increase with different (from 0.1Gy to 50Gy) γ-ray exposure. The maximum TL sensitivity for 50Gy dose of the LiAl5O8:Ce phosphor is nearly 1.38 times whereas NaAl11O17:Ce phosphor 5.69 times higher than commercially available standard CaSO4:Dy phosphor. These phosphors may be useful for TLD materials.
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