Prof. Wieslaw Strek Profile

Prof. Wieslaw Strek

at INTiBS

SPIE Involvement:

Author

Publications (49)

Proceedings Article | 31 May 2018 Paper

Luminescent sol-gel-derived micro and nanoparticles

A. Lukowiak, Y. Gerasymchuk, W. Strek, B. Borak, A. Chiappini, A. Chiasera, C. Armellini, M. Ferrari, S. Taccheo

Proceedings Volume 10683, 106830M (2018) https://doi.org/10.1117/12.2314734

KEYWORDS: Erbium, Ions, Silica, Optical spheres, Glasses, Particles, Nanoparticles, Microresonators, Nanocrystals, Luminescence

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Proceedings Article | 23 May 2018 Presentation

The impact of nonbonding electrons on the spectroscopic properties of AgInS2 quantum dots (Conference Presentation)

Adam Olejniczak, Bartłomiej Cichy, Wiesław Stręk

Proceedings Volume 10672, 106721Y (2018) https://doi.org/10.1117/12.2307439

KEYWORDS: Quantum dots, Electrons, Artificial intelligence, Luminescence, Spectroscopy, Tolerancing, Gold, Nanoparticles, Nanoengineering, Toxicity

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The search for the new nanoscale functional materials has led to the emergence of the quantum dots (QDs) nanoengineering as a leading field of contemporary science. In recent years, special scientific attention has been devoted to the novel group of ternary I-III-VI QDs from which the chalcopyrite-type AgInS2 (AIS) have become one of the most interesting and important material for further applications, due to its reduced toxicity, red-shifted absorption and emission and high tolerance to off-stoichiometry. Despite their good luminescence properties, there is a need for extensive research to comprehend the physical nature of the electronic transitions in AgInS2 quantum dots. Because of the defect related nature of those structures the donor-acceptor pair (DAP) model is mostly indicated as the origin of emission in AIS QDs. However, limited applicability of the DAP model to highly confined structures indicate different physical mechanisms of luminescence which are still under discussion. The specific problem connected with the AIS QDs is their defect mediated kinetics of excited states relaxation resulting in highly non-exponential luminescence decays, effective trapping of the fundamental excitations and effective non-radiative relaxations [1]. Recent experiments [2,3] show that the incorporation of the pool of non-bonding electrons near the quantum dot can influence the mechanisms of excited state relaxation and significantly reduce dark states resulting in the enhancement of the QDs luminescence. Previously it was realized as the metallic gold shell around the quantum dot [2] or by placing the QDs on the metallic nanoparticles thin film [3]. Due to the known high tolerance of the AgInS2 chalcopyrite structure to off stoichiometry the excess of non-bonding electrons can be accomplished by the synthesis of non-stoichiometric metal-rich AIS QDs. Density functional theory calculations show, that the excessive Ag atoms in Ag-In-S nanoclusters result in the formation of the additional electronic energy levels near the HOMO (highest occupied molecular orbital) level with molecular orbitals of clearly non-bonding characters. In this paper we show the improvement of the luminescent properties of AIS QDs due to the deviation from stoichiometry. The results of the synthesis and optical measurements for the series of Ag(1+x)InS2 (x = -0.2, -0.1, 0.0, 0.1, 0.2, 0.3, 0.4, 0.5) QDs samples are presented. The red-shift and widening of the luminescence spectrum have been observed with the increasing of the metal amount. Femtosecond time-resolved fluorescence spectroscopy measurements reveal minor deviation from the exponential decay for the Ag-rich AIS QDs in comparison to the stoichiometric ones. It was concluded, that such behavior was inducted by the excess of non-bonding electrons in metal-rich structures. [1] Cichy B et al. Two blinking mechanisms in highly confined AgInS2 and AgInS2/ZnS quantum dots evaluated by single particle spectroscopy. Nanoscale 2016;8:4151–9. [2] Ji B et al. Non-blinking quantum dot with a plasmonic nanoshell resonator. Nat Nanotechnol 2015;10:170–5. [3] Ma X et al. Fluorescence enhancement, blinking suppression, and gray states of individual semiconductor nanocrystals close to gold nanoparticles. Nano Lett 2010;10:4166–74.

Proceedings Article | 17 May 2018 Paper

Glass photonic structures fabricated by sol-gel route

R. Tomala, A. Lukowiak, B. Borak, A. Chiappini, W. Blanc, M. Ferrari, A. Bouajaj, D. Ristic, S. Taccheo, W. Strek

Proceedings Volume 10683, 106832P (2018) https://doi.org/10.1117/12.2306449

KEYWORDS: Erbium, Ions, Glasses, Silica, Refractive index, Optical spheres, Waveguides, Luminescence, Microresonators, Coating

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Proceedings Article | 17 May 2018 Paper

The bright white emission from µ-diamonds

Wieslaw Strek, Adam Olejniczak, Robert Tomala, Bartłomiej Cichy, Anna Lukowiak, Aliaksandr Zhaludkevich, Alexandra Konovalova, Oleg Ignatenko

Proceedings Volume 10683, 1068307 (2018) https://doi.org/10.1117/12.2318052

KEYWORDS: Graphene, Diamond, Absorption, Semiconductor lasers, Light emitting diodes, Luminescence, Crystals, Ceramics

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SPIE Journal Paper | 26 August 2016 Open Access

Significance of light-soaking effect in proper analysis of degradation dynamics of organic solar cells

Michał Dusza, Wiesław Strek, Filip Granek

JPE, Vol. 6, Issue 03, 035503, (August 2016) https://doi.org/10.1117/12.10.1117/1.JPE.6.035503

KEYWORDS: Solar cells, Photovoltaics, Organic photovoltaics, Crystals, Annealing, Measurement devices, Temperature metrology, Analytical research, Silver, Zinc oxide

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Proceedings Article | 16 October 2013 Paper

Nanovectors as a complex solution for optical securing

A. Bednarkiewicz, W. Strek, D. Hreniak

Proceedings Volume 8901, 890115 (2013) https://doi.org/10.1117/12.2029089

KEYWORDS: Luminescence, Nanoparticles, Lanthanides, Thulium, Interference (communication), Signal to noise ratio, Oxides, Terbium, Erbium, Nanotechnology

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Proceedings Article | 9 February 2009 Paper

The concept of a new simple low-voltage cathodoluminescence set-up with CNT field emission cathodes

Piotr Psuja, Dariusz Hreniak, Wieslaw Strek

Proceedings Volume 7206, 72060F (2009) https://doi.org/10.1117/12.808963

KEYWORDS: Carbon nanotubes, CRTs, Prototyping, Spectrophotometry, Sensors, Time metrology, Field emission displays, Glasses, Power supplies, Finite element methods

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Proceedings Article | 7 February 2009 Paper

Fabrication and properties of nanocomposite ITO layer containing terbium doped yttrium aluminum garnet nanocrystallites

P. Psuja, D. Hreniak, W. Strek, D. Kovalenko, V. Gaishun

Proceedings Volume 7212, 72121C (2009) https://doi.org/10.1117/12.808983

KEYWORDS: YAG lasers, Transmittance, Nanolithography, Nanocomposites, Nanoparticles, Coating, Terbium, Luminescence, Field emission displays, Yttrium

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Proceedings Article | 7 February 2009 Paper

Optical and electrical properties of Mg2+ and Li+ doped Eu3+:SnO2 nanocrystallites

Piotr Psuja, Wieslaw Strek

Proceedings Volume 7212, 721208 (2009) https://doi.org/10.1117/12.809016

KEYWORDS: Ions, Luminescence, Tin, Lithium, Crystals, Europium, Magnesium, Nanolithography, X-ray diffraction, Semiconductors

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Proceedings Article | 7 February 2009 Paper

The luminescent properties of europium-doped tin dioxide nanocrystallites

Piotr Psuja, Dariusz Hreniak, Wieslaw Strek

Proceedings Volume 7212, 72121D (2009) https://doi.org/10.1117/12.809004

KEYWORDS: Ions, Luminescence, Europium, Crystals, Tin, Transmission electron microscopy, Semiconductors, X-ray diffraction, Semiconductor materials, Field emission displays

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Proceedings Article | 23 April 2008 Paper

Fabrication and luminescent properties of ITO nanocrystalline coated micro Eu:Y2O3 particles

P. Psuja, D. Hreniak, W. Strek

Proceedings Volume 6988, 69881S (2008) https://doi.org/10.1117/12.781316

KEYWORDS: Particles, Transmission electron microscopy, Oxides, Luminescence, Coating, Crystals, Ions, Tin, Scanning electron microscopy, Silica

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Proceedings Article | 21 September 2007 Paper

Fabrication of indium tin oxide (ITO) thin films by spin-coating deposition method

P. Psuja, W. Strek

Proceedings Volume 6674, 667408 (2007) https://doi.org/10.1117/12.735714

KEYWORDS: Deposition processes, Indium, Tin, Oxides, Transmittance, Thin films, Additive manufacturing, Resistance, Glasses, Indium nitride

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Proceedings Article | 17 September 2007 Paper

Preparation of europium doped tin oxide, indium oxide, and ITO nanocomposites

P. Psuja, W. Strek

Proceedings Volume 6639, 66390P (2007) https://doi.org/10.1117/12.735722

KEYWORDS: Europium, Tin, Indium, Oxides, Ions, Indium oxide, Luminescence, Transmission electron microscopy, Nanocomposites, Thin films

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Proceedings Article | 11 September 2007 Paper

Light source with carbon nanotubes field emission cathode and rare-earth doped nanocrystalline phosphors

P. Psuja, W. Strek

Proceedings Volume 6645, 66451B (2007) https://doi.org/10.1117/12.735719

KEYWORDS: Light sources, Field emission displays, Carbon nanotubes, LCDs, Switching, Cerium, YAG lasers, Nanolithography, Nanocrystals, Plasma display panels

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Proceedings Article | 14 September 2006 Paper

Total photoluminescence spectroscopy of GaN nanocrystals doped by Eu3+ ions

A. Podhorodecki, M. Nyk, J. Misiewicz, W. Strek

Proceedings Volume 6321, 63210O (2006) https://doi.org/10.1117/12.678276

KEYWORDS: Europium, Gallium nitride, Ions, Nanocrystals, Absorption, Luminescence, Energy transfer, Spectroscopy, Silicon, Combustion

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Proceedings Article | 8 October 2005 Paper

Interstitial single fiber multi-decay-probe for light dosimetry in photodynamic therapy: modelling

A. Bednarkiewicz, W. Strek

Proceedings Volume 5862, 586210 (2005) https://doi.org/10.1117/12.633041

KEYWORDS: Photodynamic therapy, Modeling, Diagnostics, Optical spectroscopy, Biomedical optics, Phototherapy

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Proceedings Article | 27 August 2005 Paper

The susceptibility of bacteria to photodynamic inactivation with lanthanide complexes of chlorin e6

Artur Bednarkiewicz, Zuzanna Drulis-Kawa, Rafal Wiglusz, Janina Legendziewicz, Gabriela Bugla-Ploskonska, Wlodzimierz Doroszkiewicz, Manfred Haupt, Wieslaw Strek

Proceedings Volume 5863, 58630V (2005) https://doi.org/10.1117/12.633092

KEYWORDS: Lanthanides, Bacteria, Fourier transforms, Silicon, Laser therapeutics, Laser applications, Laser tissue interaction, Biomedical optics, Antimicrobial agents

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SPIE Journal Paper | 1 September 2004 Open Access

Influence of uterine cervix shape on photodynamic therapy efficiency

Artur Bednarkiewicz, Wieslaw Strek

JBO, Vol. 9, Issue 05, (September 2004) https://doi.org/10.1117/12.10.1117/1.1779626

KEYWORDS: Cervix, Photodynamic therapy, Tissue optics, Natural surfaces, Light sources, Tissues, Oxygen, Optical properties, Refraction, Picosecond phenomena

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Proceedings Article | 2 August 2004 Paper

The crystal-size and power dependence of luminescence properties of Nd3+:LaAlO3 nanopowders

Wieslaw Strek, Dariusz Hreniak, Artur Bednarkiewicz, Piotr Mazur, Przemyslaw Deren, Witold Lojkowski

Proceedings Volume 5508, (2004) https://doi.org/10.1117/12.553169

KEYWORDS: Neodymium, Luminescence, Crystals, Nanocrystals, Spectroscopy, Ions, Oxides, Temperature metrology, Polishing, Lanthanum

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Proceedings Article | 7 July 2004 Paper

In vitro experimental photodynamic diagnosis of artery atherosclerosis

Dariusz Bialy, Arkadiusz Derkacz, M. Wawrzynska, Miroslaw Kwasny, Wieslaw Strek, Marcin Protasiewicz

Proceedings Volume 5505, (2004) https://doi.org/10.1117/12.577614

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Proceedings Article | 6 October 2003 Paper

Comparison of CW and Q-switched laser action in Yb-doped KYW and KGdW crystals

Artur Bednarkiewicz, Andrei Kuzmin, Wieslaw Strek, Przemyslaw Deren

Proceedings Volume 5230, (2003) https://doi.org/10.1117/12.532103

KEYWORDS: Laser crystals, Q switched lasers, Crystals, Ions, Ytterbium, Continuous wave operation, Q switching, Semiconductor lasers, Q switch crystals, Output couplers

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Proceedings Article | 6 October 2003 Paper

In vitro human atherosclerotic plaque recognition by photosensitizer mono-L-aspartyl chlorin e6-assisted light-induced fluorescence (PALIF)

Dariusz Bialy, Arkadiusz Derkacz, M. Wawrzynska, A. Bednarkiewicz, Piotr Ziolkowski, H. Nowosad, Wieslaw Strek, Marcin Protasiewicz

Proceedings Volume 5229, (2003) https://doi.org/10.1117/12.520616

KEYWORDS: Luminescence, Arteries, Tissues, In vitro testing, Photodynamic therapy, Spectroscopy, Collagen, In vivo imaging, Detection and tracking algorithms, Picosecond phenomena

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Proceedings Article | 6 October 2003 Paper

Medium-power ytterbium lasers

Artur Bednarkiewicz, Joshua Kalisky, Wieslaw Strek

Proceedings Volume 5230, (2003) https://doi.org/10.1117/12.532108

KEYWORDS: Ytterbium, Semiconductor lasers, Laser crystals, Diodes, Crystals, Laser damage threshold, Ions, Interferometric modulator displays, High power lasers, Optical pumping

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Proceedings Article | 19 April 2002 Paper

Customized safety features by measuring of spectral characteristics of IR-sensitive taggants

Marek Jasiorski, Halina Podbielska, Wieslaw Strek, Ireneusz Marciniak, Marek Stankiewicz

Proceedings Volume 4677, (2002) https://doi.org/10.1117/12.462706

KEYWORDS: Luminescence, Ions, Safety, Information security, Ultraviolet radiation, Optical properties, Visible radiation, Infrared radiation, Semiconductor lasers, Fiber optics

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Proceedings Article | 17 April 2001 Paper

Investigation of nanostructured Lu2O3:Tb

E. Zych, Przemyslaw Deren, Wieslaw Strek, Andries Meijerink, K. Domagala, W. Mielcarek

Proceedings Volume 4413, (2001) https://doi.org/10.1117/12.425425

KEYWORDS: Crystals, Absorption, Nanostructuring, Combustion, Terbium, Lutetium, Luminescence, Temperature metrology, Particles, Ions

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Proceedings Article | 12 February 1999 Paper

Advantages of sol-gel technologies for biomedical applications

Agnieszka Ulatowska-Jarza, Damian Andrzejewski, K. Maruszewski, Halina Podbielska, Wieslaw Strek

Proceedings Volume 3567, (1999) https://doi.org/10.1117/12.339188

KEYWORDS: Sol-gels, Glasses, Sensors, Optical fibers, Silica, Matrices, Biomedical optics, Molecules, Optical coatings, Laser applications

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Proceedings Article | 1 April 1998 Paper

Laser-induced anti-Stokes luminescence for protection of documents and security papers

Halina Podbielska, Wieslaw Strek

Proceedings Volume 3314, (1998) https://doi.org/10.1117/12.304706

KEYWORDS: Ions, Luminescence, Infrared radiation, Semiconductor lasers, Visualization, Ytterbium, Printing, Information security, Crystals, Visible radiation

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Proceedings Article | 13 January 1998 Paper

Optical properties of a photosensitizer entrapped in sol gel glass

Agnieszka Ulatowska-Jarza, K. Maruszewski, Halina Podbielska, Wieslaw Strek

Proceedings Volume 3196, (1998) https://doi.org/10.1117/12.297926

KEYWORDS: Sol-gels, Optical properties, Glasses, Water, Matrices, Absorption, Bioalcohols

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