Bojana Milićević

Bojana Milićević
Vinča Institute of Nuclear Sciences | VIN · Department of Radiation Chemistry and Physics

M.Sc., University of Belgrade

About

39
Publications
7,006
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405
Citations
Additional affiliations
December 2011 - present
Vinča Institute of Nuclear Sciences
Position
  • Research Assistant

Publications

Publications (39)
Article
We report an organic solvent-assisted (OSA) co-precipitation strategy for the production of Mn4+-activated K2TiF6 phosphor. The phosphor particle size was controlled through the selection of organic solvents with an alcohol functional group and different carbon chain lengths used in the synthesis. The synergistic effect of the organic solvent and h...
Article
Mn⁴⁺-activated fluorides rank among the most significant red phosphors for white light emitting diodes (LEDs) with enhanced color rendition, while their poor moisture resistance hinders further application. Surface coating with a protective layer is general approach to improving moisture resistance. However, these methods usually suffer from comple...
Article
Full-text available
Single crystal luminescence materials usually show higher luminous efficiency and better stability than a powdery one. Poor water resistance of Mn 4+ doped powdery fluoride red phosphors limits their further application for white light‐emitting diodes (WLEDs) with high color rendering index. In this report, we have presented a solvent‐vapor transpo...
Article
Single crystal luminescence materials usually show higher luminous efficiency and better stability than a powdery one. Poor water resistance of Mn 4+ doped powdery fluoride red phosphors limits their further application for white light‐emitting diodes (WLEDs) with high color rendering index. In this report, we have presented a solvent‐vapor transpo...
Article
Mn⁴⁺-activated fluoride red phosphors, the most important red phosphors for warm white light emitting diodes (LEDs), usually suffer from inherent poor moisture resistance which is a major obstacle to their long-lasting outdoor applications in a high humidity environment. Surface modification of phosphors by coating with either organic or inorganic...
Article
The light degradation of WLED devices after long-time use has been proved to be mainly caused by thermal quenching of phosphors, therefore, the design of single-component white-light emitting phosphors with high thermal stability remains a huge challenge. A novel single-phase white light-emitting phosphor Ca8MgLu(PO4)7:Tm³⁺,Dy³⁺ was designed and pr...
Article
The local crystal structure engineering becomes an important strategy to design new phosphors with enhanced optical and thermal performance of white light-emitting diodes. Herein, a series of Na3Sc2(PO4)3: Eu²⁺ and KyNa2.97-ySc2(PO4)3: 0.03Eu²⁺ phosphors were synthesized via traditional high temperature solid-state reaction method. X-ray powder dif...
Article
In this work, the potential of Li1.8Na0.2TiO3:Mn4+ for the lifetime-based luminescence thermometry is assessed. The material is prepared by the solid-state reaction of Li2CO3, Na2CO3, and nanostructured TiO2 at 800 °C, and its monoclinic structure (space group C2/c) is confirmed by X-ray diffraction analysis. In this host, Mn4+ provides strong abso...
Article
Luminescence of monoclinic lithium metatitanate (Li2TiO3) powders activated with different quantities of Mn4+ is studied in detail. Its strong deep‐red emission arising from the Mn4+ 2Eg → 4A2g spin forbidden transition is centered at around 688 nm and is suitable for luminescence thermometry. Structural and electron paramagnetic resonance analyses...
Article
Full-text available
(Ca1-x-yMgxSryCl2/SiO2):Eu2+ phosphors with intensive violet-blue emission were synthesized through a high temperature solid-state reaction method. The colour of emission is tunable from violet-blue to blue as well as to violet spectral region by adjusting the concentration of Mg2+ or Sr2+, respectively. An abnormal shift in emission wavelength wit...
Article
Single-component white light phosphor with broad and full color spectrum is urgently desired to overcome the remaining problems in commercial phosphors. In this paper, Eu3+ as the dopant of Sr3ZnTa2O9 (SZT) plays an important role in structural modulation (including structural order-disorder and intrinsic oxygen defects), as demonstrsted by the ele...
Article
Full-text available
The genotoxic and antigenotoxic behavior of the interfacial charge transfer (ICT) complex between nano-sized TiO2 particles and caffeic acid (CA) was studied in in vitro experiments. The formation of the ICT complex is indicated by the appearance of absorption in visible-spectral range. The continual variations method indicated bridging coordinatio...
Article
Fabrics made of wool, linen, silk, and cotton, which are used in the making of artifacts of cultural heritage, were divided into three groups. The first group wasn’t dyed, the second group was dyed with natural dye (using sour cherry), and the third one was dyed with artificial aniline dye. For the conservation purposes, all samples were exposed at...
Article
YPO4 phosphors doped with trivalent ion Pr³⁺ were prepared by sol–gel method and treated with different doses of gamma radiation, from 0.25 MGy to 4 MGy. Effects of radiation on morphology, structure and luminescent properties were analyzed. Also, the influence of radiation on the change in the color of the samples was examined. The color efficienc...
Article
Full-text available
Surface modification of titanium dioxide nanoparticles (TiO2 NPs) with the biologically active molecule pyridoxine hydrochloride (vitamin B6) was found to alter the optical properties. Microstructural characterization involving transmission electron microscopy (TEM) and X-ray diffraction (XRD) analysis revealed that the anatase TiO2 NPs had a narro...
Poster
Full-text available
In order to increase the efficiency of the absorption of solar radiation and the stability of the material we created an anatase nanopowder of appropriate geometry and changed the chemical structure of TiO2 by adding atoms of the rare earth metal neodymium.
Article
Under normal conditions, titanium dioxide does not absorb visible light photons due to large band gap. Nevertheless, when titanium dioxide nanoparticles (TiO2 NPs) are surface-modified with thiosalicylic acid (TSA), their optical properties are altered owing to the formation of charge transfer complex that initiates absorption in the visible spectr...
Chapter
Full-text available
Titanium dioxide is a wide band‐gap semiconductor of high chemical stability, nontoxicity and large refractive index. Because of the high photocatalytic activity, anatase is a preferred TiO 2 form in many applications such as for air and water splitting and purification. Doping of TiO 2 with various ions can increase the photocatalytic activity by...
Article
Sol-gel technique for the synthesis of anatase TiO2 at 420 °C produces nanocrystals of 10–20 nm in size with Ti4+ in crystal volume and Ti3+ at terminal planes of the crystal. The study of Li+ co-doping effects on the structure, morphology, absorption, and luminescence of Eu3+ activated TiO2 anatase nanocrystals is presented. Pure anatase structure...
Article
The systematic investigation of crystallization kinetics of heavy-group lanthanide dititanate pyrochlores, HL2Ti2O7 (HL=Lu, Tm, Er, Ho, Y, Dy, and Tb) is presented. Materials are prepared by the Pechini-type polymerized complex route, and their thermal properties were studied by differential thermal analysis under non-isothermal conditions. For thi...
Article
This paper presents parallel factor analysis (PARAFAC) of fluorescence of cereal flours. Excitation-emission matrices (EEM’s) of different cereal flours (wheat, corn, rye, rice, oat, spelt, barley and buckwheat) were measured in a front-face configuration over the ultraviolet–visible spectral range. EEM’s showed that flours strongly fluoresce in tw...
Article
The crystallization kinetics of Y2Ti2O7 powders prepared by a Pechini-type polymerized complex route was studied using differential thermal analysis under non-isothermal conditions. Apparent activation energies of crystallization of 816 and 804 kJ mol− 1 were obtained from calculations based on the Arrhenius equation and isoconversional analysis, r...
Article
Full-text available
Objective: The aim of this study was to evaluate changes of color and fluorescence of resin based composite exposed to beer. Materials and methods: 84 samples (13 mm in diameter and 1.5 mm thick) of microhybrid composite Gradia Direct(TM) extra bleach white were immersed in 5 different beers (dark and light) or distilled water. Color and fluores...
Article
Objective The aim of this study was to evaluate changes of color and fluorescence of resin based composite exposed to beer. Materials and Methods 84 samples (13 mm in diameter and 1.5 mm thick) of microhybrid composite Gradia DirectTM extra bleach white were immersed in 5 different beers (dark and light) or distilled water. Color and fluorescence...
Article
Full-text available
Background/Aim. Discoloration of dental restorations makes them aesthetically unacceptable and is a frequent reason for replacement of composite restorations. The aim of this study was to evaluate changes of color and fluorescence of resin-based composites (RBCs) exposed to natural juices and energy drinks. Methods. Microhybrid composite Gradia Dir...
Conference Paper
The aim of this study was mostly to evaluate the effects of dose of gamma irradiation on the optical properties of commercial papers commonly used in libraries and archives to optimize the irradiation conditions. For the application of paper over a longer period it is very important to predict the extent to which the paper will change the optical c...
Article
Full-text available
Colour changes in Gradia Direct™ composite after immersion in tea, coffee, red wine, Coca-Cola, Colgate mouthwash, and distilled water were evaluated using principal component analysis (PCA) and the CIELAB colour coordinates. The reflection spectra of the composites were used as input data for the PCA. The output data (scores and loadings) provided...
Article
Using Spark Plasma Sintering it is possible to produce polycrystalline ceramics of very fine microstructure and good mechanical properties. This work presents the fabrication of such ceramics using Eu3+-doped (Y0.7Gd0.3)2O3 nanopowder as a starting material. We monitored the changes in the morphology of ceramic samples and their consolidation with...
Article
Full-text available
The comparative kinetic analysis of the non-isothermal crystallization was performed for Eu3 + doped Zn2SiO4 samples, prepared by the polymer induced sol–gel procedure and thermally treated in the conventional furnace and in a microwave oven. This comparison is done using various thermal analysis techniques and is supported by SEM investigation. It...
Conference Paper
Full-text available
Polycrystalline ceramics are more amenable products for mass production that, depending on their composition, have potential uses as light emitting sources or as scintillating materials in medical planar x-ray imaging and mammography. It is expected that employing nanopowders as starting materials would provide for the easier preservation of grains...
Conference Paper
Full-text available
Zinc silicate (Zn2SiO4) has been identified as a suitable host matrix for many transition metal and rare earth dopant ions, providing excellent luminescent properties in the blue, green and red spectral zones. For instance, phosphors based on manganese-doped Zn2SiO4 are important materials for lamps and plasma display panels and when doped with rar...

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Projects

Projects (2)
Project
Numerous studies have attempted to modify the optical properties of TiO2 mainly by doping it with other elements or by sensitization with various inorganic or organic compounds. In our project we will search for options to modify the optical properties of TiO2 by adjusting its nanostructure and activating either its surface or volume. The properties will be optimized primarily for use in photovoltaic devices, but also will be applicable to other optoelectronic devices, sensors, and photocatalysts. In order to increase the efficiency of the absorption of solar radiation and the stability of the material we will create nanostructures of appropriate geometry, change the chemical structure of TiO2 by adding atoms of different elements (metals substituting Ti atoms, or nonmetals substituting oxygen atoms) and make surface modification of TiO2 with different ligands of inorganic or organic origin. The TFs will be obtained from TiO2 nanostructures using optimized and modified procedure involving magnetron sputtering in combination with anodization, and complementary to this path, chemically synthesized modified TiO2 nanostructures will be used for creating TFs via "spin coating". Project's leaders: Andreja Gajovic and Radenka Krsmanovic Whiffen.
Project
The project aims at the development of novel fabrication method of nanostructured ceramics by coupling a colloidal processing (slip casting) and a carbon free flash technique (microwave sintering). The use of slip casting should improve nanoparticles packing into a green body whereas microwave sintering is a flash sintering technique that generates less point defect in the final sample due to carbon contamination. Particular attention will be dedicated to establish a new procedure for ceramic fabrication from nanopowders (bixbyte oxides, some spinels and pyrochlores) allowing us to obtain high quality transparent ceramics. Project leaders: Radenka Krsmanovic Whiffen and Damien Bregiroux