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Optical Properties of Y_2O_3:Eu^{3+} Red Emitting Phosphor Obtained via Spray Pyrolysis

100%

Antić Ž., Krsmanović R., Ðorđević V., Dramićanin T., Dramićanin M.

Acta Physica Polonica A

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2009

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vol. 116

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issue 4

622-624

EN

In the present work we explored the possibility of obtaining Y_2O_3:Eu^{3+} μm-size particles by an ultrasonic spray pyrolysis method. As-prepared sample constitutes of spherical, hollow particles with an average size of 1 to 2 μm. Pure, well crystalline, cubic Y_2O_3 is formed after additional thermal treatment at 800°C for 2 h. A detailed optical investigation has been done with photoluminescence measurements in the energy and time domains. Experimental intensity parameters, transition rates and quantum efficiency of the ^{5}D_0 emission are evaluated on the basis of Judd-Ofelt theory.

2

Optical Biopsy Method for Breast Cancer Diagnosis Based on Artificial Neural Network Classification οf Fluorescence Landscape Data

100%

Dramićanin T., Zeković I., Dimitrijević B., Ribar S., Dramićanin M.

Acta Physica Polonica A

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2009

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vol. 116

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issue 4

690-692

EN

Supervised self-organizing map, a type of artificial neural network, is applied for classification of human breast tissue samples utilizing data obtained from fluorescence landscape measurements. Female breast tissue samples were taken soon after the surgical resection, identified and stored at -80°C until fluorescence measurements. From fluorescence landscapes obtained in UV-VIS region spectral features showing statistically significant differences between malignant and normal samples are identified and further quantified to serve as a training input to neural network. Additional set of samples was used as a test group input to trained network in order to evaluate performance of proposed optical biopsy method. Classification sensitivity of 83.9% and specificity of 88.9% are found.

3

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

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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

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2 Krsmanović R.

1 Andrić Ž.

1 Antić Ž.

1 Dimitrijević B.

1 Marinović-Cincović M.

1 Ribar S.

1 Zeković I.

1 Ðorđević V.

1 šećerov B.

Optical Properties of Y_2O_3:Eu^{3+} Red Emitting Phosphor Obtained via Spray Pyrolysis

Optical Biopsy Method for Breast Cancer Diagnosis Based on Artificial Neural Network Classification οf Fluorescence Landscape Data

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