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Optical and Thermal Investigation of Sol-Gel Derived Eu^{3+}:Y_2SiO_5 Nanoparticles

100%

Krsmanović R., Andrić Ž., Marinović-Cincović M., Zeković I., Dramićanin M.

Acta Physica Polonica A

2007

vol. 112

issue 5

975-980

Investigation done on Y_2SiO_5 nanoparticles doped with Eu^{3+} ions obtained with the alkoxy sol-gel route is presented in this paper. We investigate the optical and thermal properties of obtained material during the conversion of the gel into nanocrystalline form. Fourier transform infrared spectroscopy and fluorescence spectroscopy of Eu^{3+} ions are used for the optical characterizations, while thermal analysis is done with thermogravimetric-differential thermal analysis technique. Material exhibits characteristic luminescence emission of the trivalent europium ion.

Investigation on the Crystallization Process of Eu^{3+}:CaSiO_3 Gel Using Optical and Thermal Methods

86%

Andrić Ž., Krsmanović R., Marinović-Cincović M., Dramićanin T., šećerov B., Dramićanin M.

Acta Physica Polonica A

2007

vol. 112

issue 5

969-974

Alkoxy sol-gel technique is an important preparation method for production of rare-earth based phosphors. Crystallization of gel provides a way to prepare phosphors on lower working temperatures than those required for the solid state reactions. CaSiO_3 gel samples were obtained through hydrolysis-condensation reactions of tetraethylorthosilicate as silica source. In this work we studied the process of crystallization of Eu^{3+}-activated CaSiO_3 gel and decomposition of organic precursors by means of thermal analysis and infrared spectroscopy. Results of scanning electron microscopy and energy-dispersion spectrometry are used to check chemical composition and morphology of synthesized material. Emission spectra and emission lifetime measurements are performed to investigate luminescence properties of Eu^{3+} doped CaSiO_3 powder.

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2 Acta Physica Polonica A

2 2007

2 Andrić Ž.

2 Dramićanin M.

2 Krsmanović R.

2 Marinović-Cincović M.

1 Dramićanin T.

1 Zeković I.

1 šećerov B.

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Optical and Thermal Investigation of Sol-Gel Derived Eu^{3+}:Y_2SiO_5 Nanoparticles

Investigation on the Crystallization Process of Eu^{3+}:CaSiO_3 Gel Using Optical and Thermal Methods