Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5402736 | Journal of Luminescence | 2010 | 8 Pages |
Abstract
Nanocrystalline LiF:Mg,Cu,P phosphor material of different shapes and sizes (microcrystalline cubic shape, nanorod shape and nanocrystalline cubical shaped) have been prepared by the chemical co-precipitation method. Thermoluminescence (TL) and other dosimetric characteristics of the phosphor are studied and presented here. The formation of the materials was confirmed by the X-ray diffraction (XRD). Its shapes and sizes were also observed using scanning electron microscope (SEM). The TL glow curve of the microcrystalline powder shows a prominent single peak at 408Â K along with another peak of lesser intensity at around 638Â K. On the contrary, the nanocrystalline rod shaped particles show a peak of low intensity at 401Â K and a prominent peak around 700Â K while the nanocrystalline particles in cubical shapes again show two peaks, one at around 407Â K and the other at around 617Â K, of which the lower temperature (407Â K) peak is more prominent. The glow curve structure changes at very high doses (100Â kRad) and some new peaks appear at around 525 and 637Â K also the first peak appearing at around 401Â K becomes prominent. The observed changes in TL due to the change in the shape and sizes of the nanophosphor have been reported. The PL has also been studied and various excitation and emission peaks observed due to the presence of various impurities are explained. The observed results have been explained in the light of asymmetrical crystal field effects due to asymmetrical shapes of the nanocrystalline phosphor. The comparison of these properties with the microcrystalline material prepared by the same co-precipitation method is also done.
Related Topics
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Physical and Theoretical Chemistry
Authors
P.D. Sahare, J.S. Bakare, S.D. Dhole, N.B. Ingale, A.A. Rupasov,