Malgorzata Guzik

University of Wroclaw | WROC · Faculty of Chemistry

The relation between 1.9 eV red-luminescence intensity of non-bridging oxygen hole centers (NBOHCs) in silica and incident laser shot number was proved to be important to predict the occurrence of laser damage, in which a more precise prediction will benefit from a deeply understanding of the red-luminescence of NBOHCs. This study focuses on analyz...

Monochalcogenides of groups III (GaS, GaSe) and VI (GeS, GeSe, SnS, and SnSe) are materials with interesting thickness-dependent characteristics, which have been applied in many areas. However, the stability of layered monochalcogenides (LMs) is a real problem in semiconductor devices that contain these materials. Therefore, it is an important issu...

Monochalcogenides of groups III (GaS, GaSe) and VI (GeS, GeSe, SnS, and SnSe) are materials with interesting thickness-dependent characteristics, which have been applied in many areas. However, the stability of layered monochalcogenides (LMs) is a real problem in semiconductor devices that contain these materials; therefore, it is an important issu...

HYPHa project is a joint venture to develop a low-cost integrated photonics platform based on silica-titania materials deposited via a sol-gel method and a dip-coating procedure. The dip-coating technique is cost-effective and makes it possible to produce high-quality and low-loss silica-titania thin films on glass or buffered silicon substrates. F...

Research is underway to find organic dyes with high photoluminescence quantum yield (QY) and compatibility with liquid crystals (LCs) that would be suitable for application in LC systems such as...

We report a detailed analysis of both structural and spectroscopic properties of Nd3+-doped GdPO4 nano-powders obtained via various wet synthesis methods. This type of material may be useful in optoelectronic,...

Ca1-3x-yMny▯xNd2x(MoO4)1-3x(WO4)3x molybdato-tungstates (▯ denotes vacant sites) were successfully synthesized by high-temperature solid-state reaction. New materials crystallize in scheelite-type structure within whole homogeneity range of solid solution (x ≤ 0.2000 and y = 0.0200). Morphological features and particle size distribution were invest...

Pure red fluorescence generated by near infrared (NIR) excitation is desired for bio-imaging with high biological penetration, but without cell damage or multi-photon photo-toxicity. In this work, β-NaYF4:Er³⁺ and β-NaYF4:Er³⁺,Tm³⁺ microcrystals were synthesized using a novel hydrothermal method. β-NaYF4:Er³⁺ microcrystals exhibited intense green a...

New trends towards development of integrated optics and miniaturization of photonic devices require fabrication of miniaturized photonic components. Fabrication of waveguiding films with designed optical properties is a fundamental process for production of planar integrated devices. We report here preparation of thin layers based on TiO2 precursor...

This paper investigates a highly attractive platform for an optical waveguide system based on silica-titania material. The paper is organized into two parts. In the first part, an experimental study on the development of an optical waveguide system is conducted via the sol-gel dip-coating method, and the optical characterization of the waveguide sy...

In this lecture, two main goals have been shown: first, the state-of-art of the inorganic scintillator materials used for many important applications and, secondly, the illustration of the dynamics of this field by giving spectroscopic and scintillation properties of the most advanced oxide scintillator Ce3+, Mg2+-co-doped Gd3Al2Ga3O12 (GAGG) garne...

Yb³⁺-doped silica fiber (YDF) lasers have important application prospects in space. However, YDFs face various types of harsh ionizing radiation (such as protons, electrons, and γ-rays) during space missions. Radiation-induced darkening (RD), primarily because of the generation of color centers at a microscopic scale, can seriously deteriorate the...

Yb3+‐doped silica fiber (YDF) laser has important applications in space. However, the darkening effect caused by space ionizing radiation, which is due to the generation of color centers at the microscopic scale, can significantly deteriorate the performance of the YDF laser. This review mainly includes three aspects: First, we briefly introduce sp...

LuPO4 in the form of nano-powders can find potential application in bio-imaging and luminescence thermometry. To enable development of functional materials there is a need to acquire basic information about the effect of morphology and grain size on spectroscopic properties. So, we investigated a series of Nd³⁺-doped LuPO4 nanoparticles prepared wi...

In this paper we present the relationships between structural and spectroscopic investigations of neodymium ion dopant (Nd3+) in selected oxide host lattices with particular highlighting its role as a structural probe. The main goal is to get precious information about the symmetry and activator’s environment in the following different oxide host l...

The structural and spectroscopic properties of a new optical material, such as cubic Nd3+-doped mixed molybdato-tungstate of chemical formula La2MoWO9 which could serve to achieve the difficult task of fabrication...

Some specifics of spectroscopic and laser properties of Yb³⁺ dopant are shown in Yb³⁺-doped Lu2O3 cubic sesquioxide transparent ceramics, a very important laser material, fabricated by Ikesue in World Lab. Co., Ltd, Nagoya (Japan) using the method basedon solid-state mixing of oxides and sintering by HIP technique, in the same way as for Nd³⁺ laser...

Several Ce³⁺/Tm³⁺-co-doped alumino-silicate glasses with various Ce³⁺/Tm³⁺ ratios were prepared by a sol-gel method combined with vacuum sintering. To determine their radiation resistance, the glasses were exposed to 1 and 100 kGy γ-ray. The effect of the Ce³⁺/Tm³⁺ ratio on the absorption, emission and fluorescence lifetime of the glasses under inv...

We report the absorption and emission properties of neodymium (Nd³⁺)-doped APLF glasses [20Al(PO3)3-80LiF + x NdF3, x = 0.5–2.0 mol%] as potential vacuum ultraviolet (VUV) scintillator materials due to their interconfigurational 4f²5d transitions which have not yet been investigated. The Nd³⁺-doped APLF glasses exhibit absorption and emission peaks...

Optical thermometry is a non-contact temperature detective technique that has high sensitivity and rapid response. In present work, we developed LiYF4:20Yb³⁺,1Ho³⁺ (mol%) micro octahedrons obtained by a modified hydrothermal method. The temperature dependent up-conversion (UC) emission and luminescence decays for LiYF4:20Yb³⁺, 1Ho³⁺ under 976 nm LD...

We report a detailed analysis of both structural characterization and high-resolution spectroscopic properties of Nd³⁺-doped YPO4 and LuPO4 in the form of nano/micro powders. LuPO4, like YPO4 crystalizes in a zircon-type tetragonal system. Nd³⁺ ion in substitution of Lu³⁺ or Y³⁺ cations occupies the main symmetry site D2d and the presence of additi...

Lanthanide complexes with phthalocyanines (Pc) and porphyrins are of great interest because of their unique luminescence behavior and many applications. Our research is devoted to photophysical studies and theoretical calculations HF and DFT of the structure and spectroscopy of two dimeric systems, created by chloro Yb(III) monophthalocyanines and...

The development of novel phosphors with stable and efficient green and red up-conversion (UC) emission is important for many applications such as fluorescent labeling, color display and anticounterfeiting. In this work, we report a stable and efficient green and red up-converter of LiYF4:Yb³⁺,Ho³⁺ octahedrons obtained by modified hydrothermal metho...

The homogeneous Yb3+/Al3+/B3+‐co‐doped silica glasses were prepared via a sol‐gel method. The impact of B2O3 addition on the physical, optical properties and network structure was systematically studied. The network structure was investigated by the Fourier Transform Infrared (FT‐IR), Raman and Solid State Nuclear Magnetic Resonance (SSNMR). Herein...

Gd3+-doped lead molybdato-tungstates with the chemical formula of Pb1−3x□xGd2x(MoO4)1−3x(WO4)3x (where x = 0.0455, 0.0839, 0.1430, corresponding to 9.53, 18.32, 33.37 mol% of Gd3+, respectively, as well as □ denotes cationic vacancies) were successfully synthesized via combustion route. The XRD and SEM results confirmed the formation of single-phas...

We present and discuss the structural and spectroscopic properties of micro-crystalline Nd³⁺-doped LuPO4 zircon-(xenotime)-type orthophosphates (0.5–20 mol% of Nd³⁺ ions) synthesized by high-temperature solid-state reaction, in which Nd³⁺ optical rare earth ion plays the role of a structural probe. Surprisingly, in the literature there are not many...

In this paper, the most advanced oxide scintillator Ce3+, Mg2+‐co‐doped Gd3Al2Ga3O12 (GAGG) garnet host, grown by using the Czochralski method at the Tohoku University, Sendai, is reported. The charge transfer absorption band in UV, like in other Ce3+, Mg2+‐co‐doped oxides, reveals the creation of stable Ce4+ oxidation state, in addition of the usu...

The optical properties of 20Al(PO3)3–80LiF (APLF80) glass co-doped with praseodymium (Pr³⁺) and cerium (Ce³⁺) ions are explored. By co-doping the host APLF80 glass matrix with praseodymium (Pr³⁺) and cerium (Ce³⁺) ions (APLF80 + PrCe), improvement in the luminescence decay time of the 5d → 4f allowed electric dipole transition of singly-doped APLF8...

The family of cubic yttrium molybdate (Y6MoO12) has been chosen due to the possibility of substituting Y³⁺ cations by luminescent trivalent rare earth (RE³⁺) ones and to obtain transparent optical ceramics. The goal of the paper is to find a route towards the fabrication of dense Y6MoO12 ceramics from nano-powders and using well-known ceramic sinte...

Rare earth (RE)-doped tungstates and molybdates found many applications in the optical field as laser materials, phosphors or scintillators. Especially, there is a huge challenge to fabricate new RE-doped transparent ceramics from nano-crystalline powders, crystallizing in the cubic structure, for application in optics. However, the knowledge about...

Scheelite-type Ca1−xMnxMoO4 (x = 0.0, 0.01, 0.05, 0.10 and 0.15) nanomaterials were successfully synthesized via a combustion route. Dielectric studies showed a weak n-type electrical conductivity characteristic for insulators and low relative permittivity (εr < 15) decreasing with increasing Mn2+ content. CaMoO4 and Mn2+-doped nanomaterials are ch...

Tetragonal, scheelite-type Pb1–3x□xGd2x(MoO4)1–3x(WO4)3x materials (x = 0.0455, 0.0839, 0.1154, 0.1430, 0.1667 and 0.1774, where □ denotes vacancies) synthesized via solid state reaction route were magnetically and electrically examined. The ac and dc magnetic measurements as well as the Brillouin fitting procedure showed paramagnetic state with ch...

As widely known, un-doped and rare earth-doped molybdates and tungstates are promising group which have attracted great attention in wide branches of optical material application not only as laser hosts but also as phosphors and scintillators. Most of laser host materials have been obtained as single crystals by Czochralski method. However, the mat...

We present and discuss the structural and spectroscopic properties of micro-crystalline Yb³⁺-doped La2Mo2O9 molybdates (0-25 mol% of Yb³⁺ ions) synthesized by the high-temperature solid-state reaction in which Yb³⁺ optical rare earth ions play the role of a structural probe. The main objective is to apply these materials to transparent optical cera...

The luminescence property parameters of the Yb³⁺-doped bismuthate glass are investigated, and the energy transfer from those defect quenching centers such as Yb²⁺ and Bi³⁺ to Yb³⁺ is also discussed. Based on the optimized matrix composition and without the sharp decline of the fluorescence lifetime, the near-infrared emission cross-section of Yb³⁺...

In recent years the challenge is generating highly processed functional materials using minimum amount of 4f precious elements. Henceforth, the efforts are put into elaborating doped polymers, thin films and nanomaterials. The lanthanide chelates can be appropriate co-doping compounds covering the spectrum from blue to infrared. Moreover, compounds...

Lanthanide complexes with phthalocyanines (Pc) and porphyrins are of great interest because of unique luminescence behavior and many applications, mainly in medicine, optoelectronics, lasers and solar energy conversion. This paper is focused on photophysical studies of axially chloro substituted ytterbium mono-phthalocyanine chelate in the solid st...

We investigate the spectroscopic properties of praseodymium (Pr³⁺)-doped APLF glasses [ , ] to realize their potential application as scintillators for neutron detection. From the ultraviolet (UV) to the near infrared (NIR) region, the Pr³⁺-doped glasses exhibit absorption and emission peaks which correspond to the different interconfigurational 4f...

Yb3+-doped mixed molybdato-tungstate powders of chemical solution La2-xYbxMoWO9 which crystallize in the cubic system with the space group P213 (no. 198) were studied, so that, in further research, could serve to the fabrication of transparent optical ceramics. The powders were activated by Yb3+ ions with the concentration of (0.1, 1, 3, 10, 20 mol...

Investigations of spectroscopic properties were performed for Yb3+-doped solid solutions of chemical formulas based on mixed La2MoWO9 molybdato-tungstate powders which crystalize in the cubic system with the space group P213 (no. 198) and from which it was also possible to prepare the first translucent optical ceramics. Samples activated by the Yb3...

The main aim of this research is to demonstrate how important are the laser techniques like site selective spectroscopy and time-resolved spectroscopy at low temperature in determining the structure of compounds in complementarity of the usual XRD diffraction technique. Basing on the analyse of specific lines like the ⁵D0 ↔ ⁷F0 of Eu³⁺ ion, the ⁴I9...

The main goal of this research is the localization of Yb3+ and Er3+ rare earth ions and Co2+ transition metal ion as dopants in a glass ceramics composed of MgAl2O4 spinel nano-crystals of 10–20 nm size embedded in SiO2 glass. This is the first step of a compact self-Q-switched microchip laser. We conjugate, that is rather rare, both TEM-EDX and op...

Yb³⁺/Al³⁺ co-doped silica glasses with different Ce2O3 contents were prepared using the sol–gel method combined with high-temperature sintering. Changes in refractive index, absorption, emission and fluorescence lifetime of these glasses caused by X-ray irradiation were recorded and analyzed systematically. It is found that co-doping with certain a...

Monoclinic monazite-type Nd³⁺-doped lanthanum orthophosphate (LaPO4:Nd³⁺) nanoparticles were prepared by microwave treatment of simple lanthanide precursors such as Nd(OAc)3•xH2O, OAc = acetate) with task-specific dihydrogen phosphate ionic liquids (ILs) 1-butyl-1-methylpyrrolidinium dihydrogenphosphate- BmPyrH2PO4 (IL1) and 2-hydroxyethyl-N,N,N-tr...

We present Yb³⁺-doped Y6MoO12 solid solutions as a very promising NIR emitting phosphor with some hope to obtain them in the nearest future in the form of transparent ceramics due to their cubic structure. The samples are crystallizing in the cubic system with the space group Fm-3m. To perform a full structural and spectroscopic analysis on the wel...

Among a wide variety of solid state materials lanthanide beta-diketonates, their derivatives and polymeric materials based on them have become essential for advance technologies. Thus they are the subject of extensive spectroscopic studies. Using appropriate lanthanide chelates for the emission layer one can achieve electroluminescence covering the...

We show our approach in the structural and spectroscopic analysis of Yb3+-doped YAG nano-ceramics prepared by the low temperature-high pressure sintering technique (LTHP) by conjugation of both TEM-EDX and optical techniques. Pressure sintering dependences of absorption, emission and decays are analyzed and interpreted. The sample pressurized at 8G...

The necessity to develop new laser materials was our motivation to study a new family of molybdates activated by the Nd3+ ions, which crystallizes in the scheelite-type structure (the tetragonal symmetry, the space group I41∕a ). A series of Cd1 − 3xNd2x_xMoO4 solid solutions with concentration of Nd3+ ions from 0.1 to 66 mol % with respect Cd2+ io...

Eu3+-doped scheelite-type cadmium molybdate with vacancies of chemical formula Cd1-3xEu2xxMoO4 (vacancy is denoted by ) was investigated as a red-emitting conversion phosphor for white light emitting diodes (WLEDs) by taking benefice of the Eu3+ spectroscopic probe to analyze in details the structural properties as a natural continuation of our p...

The studies of lanthanide β-diketones and their derivatives have been greatly intensified because of their potential use in photonic devices. In this work the results of spectroscopic properties of a new erbium phosphor are presented. Optical characteristics of the title chelate was based on absorption and emission spectroscopy. The crystal-field c...

Absorption spectroscopy at 4 K, site selective spectroscopy technique at 77 K, decays associated to the applications of barycentre plot law (Antic-Fidancev) and crystal-field strength concept (Auzel and Malta) are used to attempt the assignment of Yb3+ energy levels in C3i and C2 centers of Lu2O3 sesquioxide structure either in ceramics or in cryst...

We report the detailed analysis of both structural characterization by SEM, thermal conductivity of high value and high resolution spectroscopic properties of Nd3+-doped Lu2O3 transparent ceramics fabricated by the non-conventional SPS method. The emission spectra of the main C2 site shows two close 4F3/2 → 4I11/2 laser lines at 1076.3 and 1080.5 n...

The necessity to develop new laser materials of tungstates and molybdates is our motivation to study a new family of molybdates activated by Nd3+ ions, which crystallizes in the scheelite-type structure (the tetragonal symmetry, the space group I41/a). A series of Cd1-3xNd2xxMoO4 stable solid solutions with concentration of Nd3+ ions from 0.1 mol%...

A series of micro-crystalline Yb3+-doped vacancied scheelite-type cadmium molybdate Cd1-3xYb2x□xMoO4 solid solutions has been prepared by a high-temperature solid state method. The structural studies performed by X-ray powder diffraction measurements have shown that the samples are monophasic and crystallize in the tetragonal scheelite-type structu...

Lasing properties have been investigated for Yb3+ doped glasses with similar emission cross sections (σemi) and lifetime while possessing different Stark levels. Narrow Stark splitting of Yb3+-phosphate glass is responsible for severe heat generation, narrow emission band and much smaller σemi at lasing wavelength, making Yb3+-phosphate glass unsuc...

C3i, C2 sites and also pairs of Nd3+ in Lu2O3 ceramics and crystal as laser potential sesquioxides are analyzed.

The motivation for this research was to find nanoscale tungstates with cubic structure, which then can be used to obtain the transparent ceramics. To our best knowledge any transparent ceramics of the rare-earth doped tungstates are not known and described in the literature, so obtaining them is therefore a great challenge. Two new classes of cubic...

The motivation for this research was to find nanoscale tungstates with cubic structure, which then can be used to obtain the transparent ceramics. To our best knowledge any transparent ceramics of the rare-earth doped tungstates are not known and described in the literature, so obtaining them is therefore a great challenge. Two new classes of cubic...

The main goal of this work is to conjugate, what is rare, two independent techniques of TEM-EDX and optical spectroscopy for the localization of Yb3+ and Er3+ rare earth ions and Co2+ transition metal ions as dopants in a compact self-Q-switched microchip laser glass ceramics composed of MgAl2O4 spinel nano-crystals of 10-20 nm size embedded in SiO...

Yttrium aluminum garnet (YAG)-based ceramics represent a valuable alternative to single crystals as active media in laser devices for specific applications. In this connection, the 1.5–1.65 µm emission channel of Er3+-doped YAG is of particular importance for the realization of diode pumped solid state lasers operating in the so-called ‘eye-safe’ r...

We show the approach in the structural and spectroscopic analysis of Yb3+-doped YAG nanoceramics prepared using the low temperature-high pressure sintering technique (LTHP) by conjugation of both TEM-EDX and optical techniques. Pressure sintering dependences of absorption, emission, and decays are analyzed and interpreted. The sample pressurized at...

The X-ray single crystal structure determination of Lu2O3 sesquioxide and of polycrystalline transparent ceramic fabricated by the unconventional spark plasma sintering (SPS) method is presented for the first time. High quality single crystals of Lu2O3 samples were obtained by using both the micropulling-down (μ-PD) method and the laser heated pede...

Three series of Yb3+-doped silica glasses containing different amounts of Al2O3 and P2O5 were prepared successfully by using a sol–gel method. Absorption, excitation and fluorescence spectra of Yb2+ ions in these silica glasses as well as X-ray photoelectron spectra (XPS) of Yb4d were recorded and analysed systematically. It is found out that the a...

60Bi₂O₃-20B₂O₃-10SiO₂-10Ga₂O₃ glasses doped with 1-9 mol% Yb₂O₃ were prepared and investigated mainly on their violet-green excitation for the typical NIR emission of Yb³⁺, generally excited in the NIR. Two violet excitation bands at 365 nm...