Wojciech Pisarski

University of Silesia in Katowice · Institute of Chemistry

An investigation of fluoroindate glass and fiber co-doped with Yb3+/Er3+ ions as a potential temperature sensor was assessed using the fluorescence intensity ratio (FIR) technique. Analysis of thermally coupled levels (TCLs—2H11/2 and 4S3/2), non-thermally coupled levels (non-TCLs—4F7/2 and 4F9/2), and their combination were examined. Additionally,...

Nanophosphors are widely used, especially in biological applications in the first and second biological windows. Currently, nanophosphors doped with lanthanide ions (Ln3+) are attracting much attention. However, doping the matrix with lanthanide ions is associated with a narrow luminescence bandwidth. This paper describes the structural and lumines...

Modified barium gallo-germanate glass hosts are still worthy of attention in studying structure–property relationships. In this work, two different series of glass systems based on (60-x)GeO2-xTiO2-30BaO-10Ga2O3 and (60-x)GeO2-xB2O3-30BaO-10Ga2O3 (x = 10, 30, 50 mol%) were synthesized, and their properties were studied using spectroscopic technique...

In this paper, the effect of the GeO2:TiO2 molar ratio in glass composition on the spectroscopic properties of germanate glasses was systematically investigated. The visible luminescence bands associated with characteristic 1D2 → 3H4 (red), 5S2, 5F4 → 5I8 (green), and 1D2 → 3F4 (blue) transitions of Pr3+, Ho3+, and Tm3+ ions in systems modified by...

In this work, the series of Dy3+-doped silicate xerogels were synthesized by sol-gel technique and further processed at 350 °C into SiO2-LaF3:Dy3+ nano-glass-ceramic materials. The X-ray diffraction (XRD) measurements, along with the thermal analysis, indicated that heat-treatment triggered the decomposition of La(TFA)3 inside amorphous sol-gel hos...

Borogermanate glasses singly doped with Dy3+ ions were synthesized and then studied using the absorption and luminescence spectra. Spectroscopic changes of Dy3+ ions have been examined for compositional-dependent glasses with various molar ratios GeO2:B2O3. In this work, several spectroscopic parameters of Dy3+ ions were obtained experimentally and...

Glasses, glass-ceramics and ceramics belong to three important classes of engineering materials, which are useful in numerous multifunctional and industrial applications [...]

Erbium (Er)-doped barium gallo-germanate (BGG) glasses modified by TiO2 have been investigated for near-infrared luminescence applications. Luminescence at 1.5 μm associated to ⁴I13/2→⁴I15/2 transition of Er³⁺ ions has been examined in function of TiO2 concentration. Several spectroscopic and near-infrared (NIR) laser parameters for Er³⁺ such as st...

The effect of BaF2, MgF2, and AlF3 on the structural and luminescent properties of gallo-germanate glass (BGG) doped with erbium ions was investigated. A detailed analysis of infrared and Raman spectra shows that the local environment of erbium ions in the glass was influenced mainly by [GeO]4 and [GeO]6 units. Moreover, the highest number of non-b...

In current work, spectroscopic properties of Nd ³⁺ ions in titanate-germanate glasses have been studied for near-IR luminescence and laser applications. Near-IR luminescence at 1.06 µm due to ⁴ F 3/2 → ⁴ I 11/2 laser transition of Nd ³⁺ ions has been examined in the function of TiO 2 concentration. Based on theoretical calculations and experimental...

Glass-ceramic is semi-novel material with many applications, but it is still problematic in obtaining fibers. This paper aims to develop a new glass-ceramic material that is a compromise between crystallization, thermal stability, and optical properties required for optical fiber technology. This compromise is made possible by an alternative method...

In this paper 1400 nm–2200 nm broadband emission under 808 nm and 976 nm laser diodes excitation in germanate glasses co-doped with (0.35–0.7) Er 2 O 3 /(0.35–0.7) Tm 2 O 3 /(0–0.15) Ho 2 O 3 (mol%) are presented. Flattened luminescence profiles were achieved as a result of RE content optimization in glasses co-doped with 0.35Er 2 O 3 /0.7Tm 2 O 3...

Inorganic glasses co-doped with rare-earth ions have a key potential application value in the field of optical communications. In this paper, we have fabricated and then characterized multicomponent TiO2-modified germanate glasses co-doped with Yb3+/Ln3+ (Ln = Pr, Er, Tm, Ho) with excellent spectroscopic properties. Glass systems were directly exci...

The remarkable variety of glasses doped with transition metal ions is a major reason for the growing popularity of spectroscopic studies to identify their optical properties. This study presents interesting results of analyzing the relationship between structural and optical properties of multicomponent germanate glass systems doped with Cr³⁺ ions....

Pr³⁺/Er³⁺ co-doped glasses based on InF3 were synthesized and then studied for white light emission. The emission spectra consist of several bands corresponding to characteristic 4f-4f electronic transitions of Pr³⁺ and Er³⁺ ions. The relative intensities of emission bands depend on the selective excitation wavelengths. The energy transfer process...

The results presented in this communication concern visible and near-IR emission of Pr3+ ions in selected inorganic glasses, i.e., borate-based glass with Ga2O3 and BaO, lead-phosphate glass with Ga2O3, gallo-germanate glass modified by BaO/BaF2, and multicomponent fluoride glass based on InF3. Glasses present several emission bands at blue, reddis...

The synthesis and characterization of multicolor light-emitting nanomaterials based on rare earths (RE3+) are of great importance due to their possible use in optoelectronic devices, such as LEDs or displays. In the present work, oxyfluoride glass-ceramics containing BaF2 nanocrystals co-doped with Tb3+, Eu3+ ions were fabricated from amorphous xer...

This study presented an analysis of the TeO2/GeO2 molar ratio in an oxide glass system. A family of melt-quenched glasses with the range of 0–35 mol% of GeO2 has been characterized by using DSC, Raman, MIR, refractive index, PLE, PL spectra, and time-resolved spectral measurements. The increase in the content of germanium oxide caused an increase i...

Spectral properties of lead-free glasses doped with Dy³⁺ ions in function of glass formers and glass modifiers were studied. The glass systems in a function of concentration GeO2 and CaO/SrO/BaO which was partially or totally replaced by CaF2/SrF2/BaF2 were synthesized. The visible luminescence spectra for obtained glasses were registered and value...

Glasses containing two different network-forming components and doped with optically active ions exhibit interesting properties. In this work, glass systems based on germanium dioxide and boron trioxide singly doped with lanthanides (Eu3+) and transition metals (Cr3+) ions are research subjects. Optical spectroscopy was the major research tool used...

An investigation of the structural and luminescent properties of the transparent germanate glass-ceramics co-doped with Ni2+/Er3+ for near-infrared optical fiber applications was presented. Modification of germanate glasses with 10–20 ZnO (mol.%) was focused to propose the additional heat treatment process controlled at 650 °C to obtain transparent...

This paper deals with broadband near-infrared luminescence properties of lead germanate glass triply doped with Yb3+/Er3+/Tm3+. Samples were excited at 800 nm and 975 nm. Their emission intensities and lifetimes depend significantly on Er3+ and Tm3+ concentrations. For samples excited at 800 nm, broadband emissions corresponding to the overlapped 3...

This work reports on the fabrication and analysis of near-infrared and mid-infrared luminescence spectra and their decays in fluoroindate glasses co-doped with Yb3+/Ho3+. The attention has been paid to the analysis of the Yb3+→ Ho3+ energy transfer processed ions in fluoroindate glasses pumped by 976 nm laser diode. The most effective sensitization...

In this work, the series of Tb3+/Eu3+ co-doped xerogels and derivative glass-ceramics containing CaF2 nanocrystals were prepared and characterized. The in situ formation of fluoride crystals was verified by an X-ray diffraction technique (XRD) and transmission electron microscopy (TEM). The studies of the Tb3+/Eu3+ energy transfer (ET) process were...

In this work, we performed a systematic analysis of the impact of selected chemical reagents used in sol-gel synthesis (i.e., N,N-dimethylformamide) and different catalyst agents (i.e., CH3COOH, HNO3) on the formation and luminescence of Eu3+-doped SiO2–LaF3 nano-glass–ceramics. Due to the characteristic nature of intra-configurational electronic t...

In this work, the transparent glass-ceramics with PbF2 nanocrystals doubly-doped with Eu³⁺ and Tb³⁺ ions were obtained by low-temperature sol–gel method. Thermal and structural properties were examined using thermogravimetric analysis (TG), differential scanning calorimetry (DSC) as well as IR-ATR spectroscopy. The formation of β-PbF2 nanocrystals...

In this work, spectroscopic properties of europium and erbium ions in heavy metal oxide glasses have been studied. The phonon energy of the glass host was determined based on Eu3+ excitation spectra measurements. Near-IR emission spectra at 1550 nm related to 4I13/2 → 4I15/2 transition of erbium in heavy metal glasses were examined with special reg...

Fluoroindate glasses co-doped with Pr³⁺/Er³⁺ ions were synthesized and their near-infrared luminescence properties have been examined under selective excitation wavelengths. For the Pr³⁺/Er³⁺ co-doped glass samples several radiative and nonradiative relaxation channels and their mechanisms are proposed under direct excitation of Pr³⁺ and/or Er³⁺. T...

In this paper, some series of lead borate glasses and glass ceramics singly doped with Dy3+ ions were prepared and then studied using spectroscopic techniques. Our research includes mainly studies of the luminescence properties of received materials for white light. The luminescence bands associated with the characteristic 4F9/2→6H15/2 (blue), 4F9/...

The effect of oxide modifiers on multiple properties (structural and spectroscopic) of phosphate glasses with molar composition 60P2O5-(10−x)Ga2O3-30MO-xEu2O3 and 60P2O5-(10−y)Ga2O3-30MO-yEr2O3 (where M = Ca, Sr, Ba; x = 0, 0.5; y = 0, 1) were systematically examined and discussed. The local structure of systems was evidenced by the infrared (IR-AT...

Novel multicomponent titanate-germanate glasses singly doped with transition metal (Cr3+) and rare earth ions (Eu3+) were synthesized and the glass transition temperatures and thermal stability parameters were determined using DSC measurements. X-ray diffraction analysis confirmed fully amorphous nature of the received samples. Their structural and...

Glass and ceramic materials doped with rare earth (RE) ions have gained wide interest in photonics as active materials for lasers, optical amplifiers, and luminescent sensors. The emission properties of RE-doped glasses depend on their chemical composition, but they can also be tailored by modifying the surrounding active ions. Typically, this is a...

In the present work, the Tb3+/Eu3+ co-activated sol-gel glass-ceramic materials (GCs) containing MF3 (M = Y, La) nanocrystals were fabricated during controlled heat-treatment of silicate xerogels at 350 °C. The studies of Tb3+ → Eu3+ energy transfer process (ET) were performed by excitation and emission spectra along with luminescence decay analysi...

Lead phosphate glasses singly-doped with selected Ln³⁺ ions (Ln = Pr, Tm) were prepared by traditional melt-quenching method. The effect of concentration of optical active dopants in glass composition on spectroscopic properties of lead phosphate glasses were systematically investigated based on excitation, visible and near-infrared emission spectr...

This work reports the sensitization of Ho3+ - doped fluoroindate glasses for near and mid-infrared emission. Special attention has been paid on the comparative analysis of the luminescent properties of the glasses co-doped with 0.8ErF3/1.6HoF3, 0.8YbF3/1.6HoF3, and 0.8TmF3/1.6HoF3. Moreover, the energy transfer processes between rare-earth (donor-a...

This work reports on the analysis of structural and spectroscopic properties of the fluoroindate glasses co-doped with Er3+/Ho3+. Structural analysis showed that erbium and holmium ions were modifier ions and depolymerizedof the fluoroindate glass network. The energy transfer processes between rare - earth ions in fluoroindate glasses pumped by and...

CaF 2 :Eu 3+ glass-ceramic sol-gel materials have been examined for reddish-orange photoluminescence applications. The transformation from precursor xerogels to glass-ceramic materials with dispersed fluoride nanocrystals was verified using several experimental methods: differential scanning calorimetry (DSC), thermogravimetric analysis (TG), X-ray...

This work reports on the analysis of near-IR and mid-IR luminescence spectra and their decays in fluoroindate glasses co-doped with Er3+/Tm3+. In particular, the energy transfer processes between rare earth ions in fluoroindate glasses pumped by 796 nm and 980 nm laser diode have been examined. Owing to donor-acceptor energy transfer and superposit...

Broadband dielectric spectroscopy (BDS), combined with X-ray diffraction (XRD) and Fourier transform infrared (FTIR) techniques were used to study the dynamics of primary (α) relaxation process and slow mode (SM), as well as structural properties and intermolecular interactions in the methyl-, isopropyl-, hexyl-, and benzyl derivative of a well-kno...

Nanocrystalline transparent BaF2:Eu3+ glass-ceramic materials emitting reddish-orange light were fabricated using a low-temperature sol-gel method. Several experimental techniques were used to verify structural transformation from precursor xerogels to sol-gel glass-ceramic materials containing fluoride nanocrystals. Thermal degradation of xerogels...

In this paper, the series of Eu3+‐doped silicate xerogels with modified initial compositions were prepared and heat‐treated at 350ºC to fabricate the glass‐ceramic materials containing CaF2 nanocrystals. The impact of N,N‐dimethylformamide (DMF) additive and catalyst agent (CH3COOH, HNO3) on sol‐gel transformation from liquid sols through silicate...

The ErF3-doped oxyfluoride phospho-tellurite glasses in the (40-x) TeO2-10P2O5-45 (BaF2-ZnF2) -5Na2O-xErF3 system (where x = 0.25, 0.50, 0.75, 1.00, and 1.25 mol%) have been prepared by the conventional melt-quenching method. The effect of erbium trifluoride addition on thermal, structure, and spectroscopic properties of oxyfluoride phospho-telluri...

In the present paper, the nanocrystalline transparent oxyfluoride SrF2:Eu³⁺ glass-ceramic materials (nGCs) were synthesized via a low-temperature sol-gel method, in which trifluoroacetic acid (TFA) was used as a fluorination reagent. The thermal degradation of precursor xerogels was examined by TG/DSC analysis and the formation of SrF2 nanocrystals...

In this work structural and luminescence properties of gallo-germanate glasses were investigated. The mentioned glass system was modified with barium and antimony oxides and doped with Eu³⁺ ions. The starting glass consisted of barium oxide as a modifier which was then gradually replaced by antimony oxide to form six glass samples. The gallo-german...

In this paper, the transparent oxyfluoride glass-ceramic materials containing YF3:Eu³⁺ nanocrystals were fabricated via controlled ceramization of precursor xerogels at relatively low temperature T = 350 °C. The formation of YF3 nanocrystalline phase from Y(CF3COO)3 was verified based on X-ray diffraction (XRD) measurements as well as high-resoluti...

Lead-based glasses doped with Dy³⁺ ions as potential candidates to generate white luminescence were studied. The ternary glass systems PbO-Ga2O3-X (where X = TeO2, GeO2, SiO2, P2O5, B2O3) were synthesized. The luminescence spectra for obtained glasses were registered and were analyzed in detail. Moreover, from the emission spectra the Commission In...

Holmium singly doped barium gallo-germanate glasses have been studied for near-infrared luminescence at 2000 nm. Near-infrared luminescence spectra corresponding to ⁵I7 → ⁵I8 transition of trivalent holmium and their decays have been examined as a function of BaF2 and activator (Ho³⁺) concentration. The integrated intensities of luminescence bands...

In the present work, the transparent oxyfluoride glass-ceramic samples containing GdF3:RE³⁺ (RE = Tb, Eu) nanocrystals (nGCs) were fabricated via controlled heat-treatment of precursor xerogels prepared using a sol-gel method. The formation of GdF3 nanocrystalline phase from gadolinium(III) trifluoroacetate was verified based on XRD measurements. T...

A novel derivative of graphene oxide, referred as a GO-S, was used as an effective adsorbent for preconcentration of heavy metal ions from water samples and chromium speciation prior to energy dispersive X-ray spectrometric (EDXRF) determination. At optimal conditions GO-S quantitatively adsorbs Cr(III), Cu(II) Zn(II) and Pb(II) ions from aqueous s...

Different experimental techniques were applied to study thermal and structural properties, strength of H-bonds, possible keto-enol tautomerism and molecular dynamics at various thermodynamic conditions in the H-bonded active substance, curcumin (CRM). Dielectric measurements revealed dynamical features of examined compound that are uncharacteristic...

In this work, lead phosphate glasses doubly doped with Tb³⁺ and Ln³⁺ (Ln = Eu, Sm) ions were prepared. The excitation and emission spectra of lanthanides ions were recorded. The luminescent properties of lead phosphate glasses containing various concentrations of acceptor ions were analyzed. It is observed that luminescence bands corresponding to c...

The near-infrared emission properties in low-phonon (805 cm ⁻¹ ) gallo-germanate glasses and their glass fibers co-doped with Yb ³⁺ /Ho ³⁺ and Yb ³⁺ /Tm ³⁺ /Ho ³⁺ have been investigated. Emission bands centered at about 2 μm correspond to ³ F 4 → ³ H 6 (Tm ³⁺ ) and/or ⁵ I 7 → ⁵ I 8 (Ho ³⁺ ) transitions. The spectral widths of emission lines are rel...

Barium gallo-germanate glasses co-doped with Ce ³⁺ and Dy ³⁺ were synthesized and their luminescence properties were studied using optical spectroscopy. The characteristic luminescence bands originating to electronic transitions of Ce ³⁺ and Dy ³⁺ ions were observed under direct excitation of Ce ³⁺ . Furthermore, the influence of rare earth ions co...

The influence of Cr ³⁺ concentration on near-infrared emission of Ho ³⁺ in barium gallo-germanate glass has been studied. Near-infrared emission bands, due to ⁴ T 2 → ⁴ A 2 (Cr ³⁺ ) as well as ⁵ I 6 → ⁵ I 8 and ⁵ I 7 → ⁵ I 8 (Ho ³⁺ ) transitions, were observed under excitation of Cr ³⁺ . The enhanced and broadband near-infrared emission was obtaine...

In this paper, a 2 μm broadband emission under 796 nm laser diode excitation in low phonon energy GeO2-Ga2O3-BaO glass system is co-doped with 0.7Tm2O3/(0.07-0.7)Ho2O3 (mol%). The widest emission band (where the Tm3+ → Ho3+ energy transfer efficiency is 63%) was obtained for 0.7Tm2O3/0.15Ho2O3 co-doped glass from which a double-clad optical fiber w...

In this work, Eu3+-doped glass-ceramic materials containing LaF3 nanocrystals (GC Eu3+:LaF3) were fabricated by controlled heat-treatment of precursor xerogels synthesized via low-temperature sol-gel method. In order to characterize the thermal resistance of silica xerogels and to determine the crystallization temperature of LaF3 phase the TG/DSC a...

In this work, the fabrication of glass-ceramic materials containing MF 3 :Eu 3+ (M = La, Gd) nanocrys-tals dispersed in silica sol-gel hosts has been presented. The transformation from liquid sols towards bulk samples was also examined based on IR measurements. The crystallization temperatures and formation of MF 3 phases were verified based on TG/...

Silica xerogels doubly-doped with Eu³⁺ and Tb³⁺ ions were prepared via low-temperature sol-gel method. The structural properties were determined based on X-ray diffraction analysis. The optical properties were studied based on excitation and emission spectra as well as luminescence decay analysis and the Tb³⁺ → Eu³⁺ energy transfer was registered....

Fully amorphous lead borate glasses triply doped with Dy³⁺/Tb³⁺/Eu³⁺ were synthesized and next studied using optical spectroscopy. The characteristic luminescence bands originating to electronic transitions of Dy³⁺/Tb3+/Eu³⁺ ions were observed under direct excitation of Dy³⁺. Moreover, the influence of concentration of rare earth ions on spectrosco...