Bojana MilićevićVinča Institute of Nuclear Sciences | VIN · Department of Radiation Chemistry and Physics
Bojana Milićević
M.Sc., University of Belgrade
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52
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Introduction
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December 2011 - present
Publications
Publications (52)
Herein, we report the photoluminescence properties of Bi³⁺-sensitized BaYF5:10 mol%Eu³⁺ nanoparticles. The emission spectra feature Eu³⁺ peaks corresponding to transitions from the ⁵D0 excited to ⁷FJ (J = 1, 2, 3, 4) lower levels with two dominant emissions positioned in the orange-red (∼ 592 nm, ⁵D0 → ⁷F1) and deep-red (∼ 697 nm, ⁵D0 → ⁷F4) region...
The method of measuring temperature using luminescence by analyzing the emission spectra of Pr3+-doped YF3 using principal component analysis is presented. The Pr3+-doped YF3 is synthesized using a solid-state technique, and its single-phase orthorhombic crystal structure is confirmed using X-ray diffraction. The emission spectra measured within th...
Powders of Y3NbO7:xDy3+ (x = 0.5, 1, 1.5, 3 and 5 mol%) were produced through a solid-state process. X-ray diffraction investigations confirm the fluorite-type structure (space group 𝐹𝑚3̅𝑚) of powders with crystallite size in the range of 19–60 nm. Both the photoluminescence excitation and emission spectra revealed the presence of defects within th...
The sensitivity of luminescent Boltzmann thermometers is restricted by the energy difference between the thermally coupled excitement levels of trivalent lanthanides, and their values further decrease with increases in temperature, rendering their use at high temperatures difficult. Here, we demonstrate how to overcome this sensitivity limitation b...
Technological progress has accelerated the researches into broadband near‐infrared (NIR) luminescent materials as next‐generation intelligent NIR light sources; however, poor thermal stability restricts the applications of NIR phosphors. Herein, new insights into Cr³⁺‐activated NIR phosphors with improved thermal stability are provided. The photolu...
We report the procedure for hydrothermal synthesis of ultrasmall Yb3+/Tm3+ co-doped Sr2LaF7 (SLF) upconversion phosphors. These phosphors were synthesized by varying the concentrations of Yb3+ (x = 10, 15, 20, and 25 mol%) and Tm3+ (y = 0.75, 1, 2, and 3 mol%) with the aim to analyze their emissions in the near IR spectral range. According to the d...
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...
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...
A solvent‐vapor transport route produces centimeter‐sized single‐crystal red phosphors. The epitaxial growth route to yield its core–shell structure at ambient temperature was adopted. These red phosphors could be applied in all‐inorganic WLED devices. Cs2TiF6:Mn⁴⁺ (CTFM) single crystal provides enhancement of quantum efficiency, moisture resistanc...
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...
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...
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...
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...
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...
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...
(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...
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...
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...
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...
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...
Luminescent thermometry is extensively investigated because it provides sensitive contactless temperature measurments. This method is proposed for measurements at place which are difficult to access and in a nanoscale environments. Two types of self-referenced luminescent thermometry methods were commonly used: fluorescence intensity ratio method,...
Red emission of the Mn ⁴⁺ ions incorporated in different materials is used in various applications, such as lighting, holographic recording, thermoluminescence dosimetry, thermometry, etc. Mn ⁴⁺ emission can improve color-rendering-index of phosphor-converted white-light-emitting diodes, and it is a promising candidate to replace the well-establish...
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...
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.
Titanium dioxide (TiO 2 ) is a wide band gap semiconductor which is used in many applications for decades. Its technical application highly depends on its crystalline structure and morphology. Because of its high photocatalytic activity, anatase is preferred TiO 2 form in many applications such as photocatalyst for air and water splitting and purif...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...