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1

Gd_{2}O_{3}:Eu^{3+}/PMMA Composite: Thermal and Luminescence Properties

100%

Antić Ž., Krsmanović R., Marinović-Cincović M., Dramićanin M.

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issue 5

831-836

EN

In recent years there is an increasing interest in obtaining and investigating composite materials that comprise nanoparticles as fillers and polymers as matrix. Such composites may display combined features of both components, and sometimes even novel properties resulting from their mutual interactions. It is important that both unique size-dependent properties of nanoparticles and favorable properties of polymer material remain preserved in the composite. In this research we investigated the possibility of obtaining composite material using as polymer matrix poly (methyl methacrylate) - PMMA and Gd_{2}O_{3}:Eu^{3+} nanopowder as filler. Three samples, containing 1, 3 and 5 mass % of Gd_{2}O_{3}:Eu^{3+}, are prepared with a dispersion casting method. The composites exhibited characteristic red emission coming from the ^{5}D_{0} → ^{7}F_{2} transition of Eu^{3+} ion in Gd_{2}O_{3}:Eu^{3+}. The observed lifetime values, around 1.1 ms, are quite high and suggest successful encapsulation of dopant ions in polymer through gadolinium oxide host. Experimental intensity parameters, transition rates and quantum efficiency of the ^{5}D_{0} emission are calculated from emission spectra using Judd-Ofelt theory. Influence of Gd_{2}O_{3}:Eu^{3+} filler on the modification of glass transition and thermo-degradable properties of the polymer matrix is also investigated. Thermal analyses give evidence of unchanged thermal stability of polymer phase in the composites.

2

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

88%

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

Acta Physica Polonica A

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2007

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vol. 112

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issue 5

975-980

EN

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.

3

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

76%

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

Acta Physica Polonica A

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2007

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vol. 112

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issue 5

969-974

EN

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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3 Acta Physica Polonica A

1 2010

2 2007

3 Dramićanin M.

3 Krsmanović R.

3 Marinović-Cincović M.

2 Andrić Ž.

1 Antić Ž.

1 Dramićanin T.

1 Zeković I.

1 šećerov B.

Gd_{2}O_{3}:Eu^{3+}/PMMA Composite: Thermal and Luminescence Properties

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