Jacek Żmojda

Bialystok University of Technology · Department of Photonics Electronics and Ligthing Technology

Double-clad optical fiber with a multi-ring core profile doped with thulium and holmium fabricated by Modified Chemical Vapor Deposition Chelate Doping Technology (MCVD-CDT) is presented. The measured Tm 2 O 3 and Ho 2 O 3 complexes’ weight concentrations were 0.5% and 0.2% respectively. Numerical analyses show weakly guiding conditions and 42.2 µm...

The near-infrared emission in fabricated low-phonon energy, gallo-germanate glass, and double-core optical fiber has been investigated. Broadband amplified spontaneous emission (ASE) was obtained in optical fiber with cores doped with: 1 st - 0.2Er 2 O 3 and 2 nd - 0.5Yb 2 O 3 /0.4Tm 2 O 3 /0.05Ho 2 O 3 as a result of the superposition of emission...

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...

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...

The radiation conversion phenomenon is used for UV sensing applications with rare earth doped phosphors. This paper presents the results of structural and optical measurements of undoped and europium doped LaPO4 phosphors. LaPO4 phosphors with 1% mol, 2% mol, and 5% mol of europium were fabricated by the co-precipitation method. The effect of Eu3+...

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...

The luminescent properties of lanthanides doped optical fibers can be modified by introducing one or more rare earth elements thus obtaining the possibility of profiling the luminescence spectrum through co-emission phenomena, energy transfer, and conversion phenomena in the energy structure of lanthanides (e.g. energy transfers, cross-relaxation)....

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...

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...

In this paper, thermal and luminescent properties of antimony-germanate SGS glass and glass-ceramic doped with europium ions as structural probe and phosphorus oxide as nucleation agent have been investigated. The effect of the modified synthesis of glass and heat treatment process on thermal and luminescence properties was discussed in detail. The...

In this work, thermal and luminescent properties of lithium-borate glass and glass-ceramics co-doped with Eu3+/Dy3+ and Eu3+/Tb3+ ions have been investigated. The parent borate glasses were synthesized by the standard melt-quenching method. The amount of crystallites grown in the glass was controlled by the appropriate choice of annealing time and...

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 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...

The effects of Sm3+ content on the optical properties and bioactivity of 13-93 bioactive glass were presented. Sm3+ doped glass fibers drawn from bioactive glass were analyzed in simulated body fluid (SBF) for the determination of ion release. Optical analysis of the Sm3+ ions in bioactive glass fibers was used for degradation monitoring. While the...

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...

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...

A series of samples containing the phosphate and tellurite glass formers were prepared by varying the barium fluoride concentration from 0 to 30 mol %. The results of the XRD analysis were indicated that barium fluoride in the 5–30 mol% content improved the glass-forming nature of oxyfluoride phosho-tellurite glasses in the TeO2–P2O5–BaF2–ZnF2–Na2O...

An investigation of the crystallization kinetics of 45S5 Bioglass® using differential scanning calorimetry is presented in this paper. Thermal analysis was performed using the Friedman method. The activation energy and the Avrami index were calculated. The glass samples were subjected to additional controlled heat treatment at 620 °C in order to ob...

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...

The RE-co-doped silica optical fibers emitting in the eye-safe spectral range are still attractive for new applications like LIDAR, pollution monitoring, navigation, and free-space optical communication. High gain and beam quality of fiber sources based on large mode area (LMA) active fibers can be fabricated by the well-known Modified Chemical Vap...

The article presents the white light emission poly (methyl methacrylate) cylindrical fibre fabricated by co-doping by organic luminescent dyes. The used composition of aromatic hydrocarbon 1,4-Bis(2-methylstyryl) benzene Bis(MSB) and xanthene dye Rhodamine B (RhB) assures covering the emission in the range 370–700 nm under 355 nm excitation (Nd-YAG...

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...

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...

Currently, there is a growing interest in the development of multi-colored materials based on the combination of two or more systems (organic or inorganic) as a strategy to take advantage of their combined physical or chemical properties. These multi-colored materials have found potential applications as sensors, amplifiers, and optical fibers. In...

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...

Dear Collegues, It is my great pleasure to invite you to submit a manuscript for consideration and possible publication in a Special Issue on "Nanostructured Ceramic and Glass" to be published in Nanomaterials IF 3.504. This Special Issue of Nanomaterials focuses on fundamental nanostructured materials, nanocomposites glass and ceramics, and the...

Dear Collegues, It is my great pleasure to invite you to submit a manuscript for consideration and possible publication in a Special Issue on "Nanostructured Ceramic and Glass" to be published in "Nanomaterials" IF 3.504 This Special Issue of Nanomaterials focuses on fundamental nanostructured materials, nanocomposites glass and ceramics, and th...

The effect of BaO content on the glass-forming ability, glass stability and structure of tellurite–phosphate oxide glasses in the 70TeO2–10P2O5–(20-x)ZnO–xBaO (x = 0, 5 and 10 mol%) system has been discussed. From the differential scanning calorimetry, the glass transition (Tg), crystallization (Tc) and the melting (Tm) temperatures were estimated....

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...

Luminescent optical fibres are one of the most important photonics elements as they allow to construct high power fibre lasers and different unique optical sources in the broad range from UV to IR. The most important requirements cover efficient luminescence core materials and easily pumped optical fibre constructions. Depends on the applications t...

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...

The polymeric optical fibre technology can be successfully used for UV spectrum range radiation measurements.Anew type of fluorescent optical fibre optode is presented. The used fluorescent wave-shifter was used for UV-VIS conversion and radiation measurements. The linear characteristic with sensitivity 480 mW ⁻¹ is presented for UV range 7.2-13.6...

The fabrication and photophysical characterization of polymeric fiber preforms, obtained from a polymerization process of poly(methyl methacrylate) (PMMA) doped with terbium(III)-tris-(2,2,6,6- tetramethyl-3,5-heptanedionate) (Tb(tmhd)3) at 1.12e1.13 mmol concentration and co-doped with europium(III)-tris-(2,2,6,6-tetramethyl-3,5-heptanedionate) (E...

Bismuth-germanate glasses with low hydroxide content co-doped with Ho3+/Yb3+ ions have been investigated in terms of structural and spectroscopic properties. To reduce OH- ions content and improve transmittance value at the wavelength of 3.1 µm, the glass synthesis has been carried out in low vacuum conditions (45–65 mBar). The composition of the h...

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...

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 chapter, the visible luminescent properties of antimony-germanate and gallo-germanate glasses, glass-ceramics and optical fibers co-doped with different rare-earth (RE) systems (e.g., Sm³⁺, Eu³⁺, Yb³⁺/Tm³⁺, Yb³⁺/Ho³⁺, Yb³⁺/Tm³⁺/Ho³⁺, Yb³⁺/Tb³⁺, Yb³⁺/Eu³⁺) have been analyzed. Emission was obtained by direct excitation of RE ions or in case o...

We report on the first spectroscopic characterization of a four-doped Yb:Er:Tm:Ho germanate glass. Overlapping of the Er, Tm and Ho may provide gain from 1550 nm to about 2150 nm with optimized concentration.

In this work, we focused on the possibility of obtaining intense and wide emission in the mid-infrared spectral range. The bismuth-germanate oxide glasses have been co-doped with erbium, holmium and ytterbium ions. Glasses have been synthesized in terms of high mid-infrared transmittance and low hydroxides content using low vacuum atmosphere (50–70...

Recently, nanocomposite glass materials embedded with silver particles and lanthanide ions have been widely investigated. The main interest is a surface plasmon resonance (SPR) phenomenon, which, as a result of nanometric particles' interaction with external electromagnetic waves, has led to the enhancement of rare-earth luminescence. In most works...

Near-infrared luminescence properties of Nd3+ and Ho3+ ions in barium gallo-germanate glasses have been reported. Several spectroscopic parameters for Nd3+ and Ho3+ ions have been determined from the Judd-Ofelt analysis and absorption/luminescence measurements. Quite large luminescence lifetime, quantum efficiency and stimulated emission cross-sect...

Up-conversion luminescence of Er³⁺-doped oxyfluoride germanate optical fiber is observed under laser-diode excitation. The enhanced green emission line is due to ²H11/2,⁴S3/2 → ⁴I15/2 transition of Er³⁺. The integrated luminescence intensity related to ²H11/2,⁴S3/2 → ⁴I15/2 (green) and ⁴F9/2 → ⁴I15/2 (red) transitions of Er³⁺ is reduced with increa...

In our work we present the energy transfer phenomenon observed in poly(methyl methacrylate) co-doped by Tb(tmhd)3 and Rhodamine B. The optical properties characterization (recorded luminescence spectra and decay time measurements) indicate efficient energy transfer (up to 67%) between used complexes. Additionally, the developed matrix was used for...

In this paper structural and optical properties of Rare Earth doped (RE) gallo-germanate glasses modified with various amount of Al2O3 have been investigated. Glasses doped with Yb³⁺, Tm3+, and Ho³⁺ ions were synthesized to study Al2O3 additive influence on their structural and emission properties in the visible spectral region. MIR spectra indicat...

In the paper analysis of structural and luminescent properties of antimony-germanate-borate glasses and glass fiber co-doped with 0.6AgNO3/0.2Eu2O3are presented. Heat treatment of the fabricated glass and optical fiber (400 °C, 12 h) enabled to obtain Ag nanoparticles (NPs) with average size 30-50 nm on their surface. It has been proofed that silve...

In this paper, heavy metal oxide glasses co-doped with erbium and holmium ions have been synthesized. Glass composition, based on bismuth and germanium oxides, has been selected in terms of high thermal stability (∆T = 125 °C), high refractive index (n = 2.19) and low maximum phonon energy (hνmax = 724 cm⁻¹). Up-conversion luminescence spectra unde...

A series of erbium doped SGS antimony-germanate glass embedding silver (Ag⁰) nanoparticles have been synthesized by a one-step melt-quench thermochemical reduction technique. The effect of NPs concentration and annealing time on the structural and photoluminescent (PL) properties were investigated. The Raman spectra as a function of temperature mea...