Structure Characterization and Luminescence Studies of MgO:Li Calcinated at Different Temperatures via Solution Combustion and Sol-Gel Methods

Öz

In the present study, lithium (Li) doped magnesium oxide (MgO) samples were prepared using Solution Combustion Synthesis (SCS) and Sol-Gel (SG) methods. Their photoluminescence (PL) and thermoluminescence (TL) behaviors were determined after the different calcination temperatures. The aim of this study is to investigate the effect of different calcination temperatures on the PL and TL sensitivities of lithium doped MgO (MgO:Li) samples in pellet and powder forms prepared by SCS and SG methods. The structural characterization analysis of MgO:Li powder and pellets were carried out using X-ray diffraction (XRD) and scanning electron microscope (SEM) methods. The results of these structure analysis showed that MgO:Li samples have different crystal properties when changing calcination temperatures were applied during the preparation of the samples. Luminescence properties of the MgO samples which were synthesized at different calcination temperatures were investigated by the Photoluminescence (PL) and TL techniques. The maximum TL intensity of the samples was obtained at calcination temperature of 800 and 1000 oC for the SCS and SG methods, respectively. Uncontrolled chromium impurities were observed in MgO samples by using PL measurements. On the PL spectrum, peaks indicating chromium (III) (Cr3+) transmission in the red portion of the spectrum at 672, 698 and 721 nm are clearly evident. We investigated high dose sensitivity in these samples. This study presents optimum calcination temperatures in order to obtain maximum PL and TL sensitivity of MgO sample. It is also clear that it will contribute to the literature that it can be studied as a new dosimetric material.

Anahtar Kelimeler

• Thermoluminescence,Photoluminescence,MgO,Calcination

Kaynakça

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