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laser induced broad band anti-Stokes white emission from liYbF_4 nanocrystals

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Journal of Rare Earths 2016年第3期34卷 227-234页

作者： l.marciniak R.Tomala M.Stefanski D.Hreniak W.Strek Institute of low Temperature and Structure Research Polish Academy of Sciences

Spectroscopic properties of tetragonal liYbF_4 nanocrystals under high dense NIR excitation at vacuum condition were investigated. White, broad band emission covering whole visible part of the spectrum from liYbF_4 nanocrystals was observed. Its intensity strongly depended on the excitation power, excitation wavelength and ambient pressure. Temperature of the nanocrystals under 975 nm excitation was determined as a function of excitation power. Strong photo-induced current was observed from liYbF_4 pallet. The emission kinetic was analyzed. The mechanism of the anti-Stokes white emission was discussed in terms of the laser-induced charge transfer emission from Yb^（2＋） states.

关键词： fluorides white emission up-conversion rare earths

Impact of grain size,Pr3+ concentration and host composition on non-contact temperature sensing abilities of polyphosphate nano- and microcrystals

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Journal of Rare Earths 2019年第8期37卷 812-818,I0001页

作者： S.Gharouel l.marciniak A.lukowiak W.Strek K.Horchani-Naifer M.Férid Research Unit of Rare Earth Materials National Research Center in Sciences of MaterialsB.P.95 Hammam-Lif2050Tunisia b Institute of Low Temperature and Structure ResearchPAS Okolna St. 50-422WroclawPoland

In this article,varied praseodymium polyphosphate hosts:MI(li,Na K)Pr(PO3)4 microcrystals and lila1-xPrx(PO3)4(x = 0.01 ^-1)nanocrystals were successfully synthesized by the flux method and the coprecipitation technique,*** size of stoichiometric nanocrystals of liPr(PO3)4 was tuned by the te mpe rature of thermal treatment in range of 35-145 *** order to dete rmine the most suitable material for the non-contact optical thermometric applications,the temperature sensing measurements were carried out by using luminescence intensity ratio(lIR)of emission bands corresponding to the ^3 P1→ ^3H5 and ^3P0→ ^3 H5 electronic transitions of Pr3+ ions into the 123-423 K temperature *** influence of the host material composition of MⅠ(li,Na,K)Pr(PO3)4 microcrystals on the sensitivity of luminescent thermometers was *** is found that the sensitivity of lithium praseodymium polyphosphate is the highest of all micropowders under ***,it is found that the nanocrystals reveal much higher relative sensitivity in respect to the microcrystalline *** highest sensitivity of lIR temperature sensing is found for liPr(PO3)4 nanocrystals(35 nm grain size)in the whole temperature range,reaching 0.283%/K at 164 *** impact of the average grain size on the sensitivity of lIR based thermometers of liPr(PO3)4 nanocrystals was *** is found that the reduction of the grain size from 145 to 35 nm results in the enhancement of the relative sensitivity from0.156 to 0.240%/K at 223 *** it is found that the high dopant concentration possesses favorable influence on the relative sensitivity of lila1-xPrx(PO3)4 nanocrystalline luminescent thermometers.

关键词： Pr^3+ Temperature sensing luminescence intensity ratio Temperature sensitivity Grain size Dopant concentration

luminescence investigation of Dy2O2S and Dy2O2SO4 obtained by thermal decomposition of sulfate hydrate

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Journal of Rare Earths 2016年第8期34卷 814-819页

作者： R.V.Rodngues l.marciniak l.U.Khan J.R.Matos H.F.Brito W.Strek Institute of Chemistry University of Sao Paulo Butanta 748 26077 Sao Paulo Brasil Institute of low Temperature and Structure Research University of Wroctaw Oko1na 250-422 Wroclaw Poland

The yellow emitting dysprosium oxysulfide （Dy2O2S） and dysprosium oxysulfate （Dy202SO4） compounds were prepared from the thermal decomposition of hydrated dysprosium sulphate. The materials were characterized by using thermogravimetry （TG/DTG）, X-ray powder diffraction （XRD）, Fourier transform infrared （FTIR） and Raman spectroscopies. The thermal stability temperatures at around 1151 and 1313 K were determined for the Dy202S and Dy202SO4 materials, respectively. The photolumines- cence properties of the dysprosium oxysulfide were investigated, showing narrow emission bands assigned to the 4F9/2----＊6HJ intracon- figurational transitions of the Dy3＋ ion. The yellow emission color of this phosphor suggests that the Dy202S is a promising material for applications in lEDs.

关键词： Dy202S/Dy202SO4 sulfate thermal decomposition luminescence rare earths

Myotropic activity and immunolocalization of selected neuropeptides of the burying beetle Nicrophorus vespilloides (Coleoptera: Silphidae)

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Insect Science 2019年第4期26卷 656-670页

作者： Arkadiusz Urbanski Jan lubawy Pawel.marciniak Grzegorz Rosinski Faculty of Biology Department of Animal Physiology and Development Adam Mickiewicz University in Poznan Poznan Poland

Burying beetles (Nicrophorus sp.) are necrophagous insects with developed parental care. Genome of Nicrophorus vespilloides has been recently sequenced, which makes them interesting model organism in behavioral ecology. However, we know very little about their physiology, including the functioning of their neuroendocrine system. In this study, one of the physiological activities of proctolin, myosuppressin (Nieve? MS), myoinhibitory peptide (Trica-MIP-5) and the short neuropeptide F (Nicve-sNPF) in N. vespilloides have been investigated. The tested neuropeptides were myoactive on N. vespilloides hindgut. After application of the proctolin increased hindgut contraction frequency was observed (EC50 value was 5.47 x 10-8 mol/l). The other tested neuropeptides led to inhibition of N. vespilloides hindgut contractions (Nicve-MS: IC50 = 5.20 x 10~5 mol/l;Trica-MIP-5: IC50 = 5.95 x 10-6 mol/l;Nicvc-sNPF: IC50 = 4.08 x 10-5 mol/l). Moreover, the tested neuropeptides were immunolocalized in the nervous system of N. vespilloides. Neurons containing sNPF and MIP in brain and ventral nerve cord (VNC) were identified. Proctolin-immunolabeled neurons only in VNC were observed. Moreover, MIP-immunolabeled varicosities and fibers in retrocerebral complex were observed. In addition, our results have been supplemented with alignments of amino acid sequences of these neuropeptides in beetle species. This alignment analysis clearly showed amino acid sequence similarities between neuropeptides. Moreover, this allowed to deduce amino acid sequence of N. vespilloides proctolin (RYlPTa), Nicve-MS (QDVDHVFlRFa) and six isoforms ofNicve-MIP (Nicve-MIP-1一 DWNRNlHSWa;Nicve-MIP-2—AWQNlQGGWa;Nicve-MIP-3—AWQNlQGGWa;Nicve-MlP-4—AWKNlNNAGWa;Nicve-MIP-5—SEWGNFRGSWa;Nicve-MIP-6— DPAWTNlKGIWa;and Nicve-sNPF—SGRSPSlRlRFa).

关键词： burying beetles immunolocalization myotropic activity neuropeptides nervous system

Synthesis,photoluminescence properties and thermal investigation by TG-MS of RE（DAS）3·xH2O(RE=Eu3+,Tb3+)

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Journal of Rare Earths 2019年第11期37卷 1164-1169页

作者： Rodrigo V.Rodrigues lukasz marciniak latif U.Khan Antonio A.l.Marins Robert Tomala Emanuel J.B.Muri Jivaldo R.Matos Wieslaw Strek Institute of Chemistry University of Sao PauloButanta 74826077 Sao PauloBrazil Institute of low Temperature and Structure Research Polish Academy of SciencesOkolna 250-422 WroclawPoland Brazilian Nanotechnology National laboratory(lNNano-CNPEM) Campinas 13083-100Sao PauloBrazil Department of Chemistry Federal University of Espirito SantoVitoria 29220-000Brazil

Rare earth(Ⅲ)diphenyl-4-amine sulfonates(RE(DAS)3·xH2O,RE=Eu^3+,Tb^3+)phosphors were synthesized by precursor method from barium diphenyl-4-amine sulfonate and rare earth ***,TG/DSC coupled to mass spectrometry(TG/DSC/MS),X-ray powder diffraction(XPD),scanning electron microscopy(SEM)and photo luminesce nce(Pl)spectroscopy were utilized to structurally and morphologically characterize the *** decomposition of Eu(DAS)3·7H2O and Tb(DAS)3·2H2O at 973 K under dynamic air atmosphere results in crystalline Eu2O2SO4 and Tb2O2SO4 materials,***,MS spectra reveal the liberation of thermal decomposition products of precursors,largely as CO2,NO2 and SO2 *** diphenyl-4-amine sulfonate(DAS)ligand demonstrats a good stabilizing property for Eu^3+and Tb^3+*** Eu(DAS)3·7H2O and Tb(DAS)3·2H2O compounds display efficient red and green emissions,under UV excitation,arising from the 5D0→7FJ(J=0-4)and 5D4→7FJ(J=0-6)transitions of the Eu^3+and Tb^3+ions,respectively.

关键词： Optical properties Rare earth oxysulfate Thermal decomposition Eu(DAS)3·7H2O Tb(DAS)3·2H2O Rare earths

Cardioactive properties of Solanaceae plant extracts and pure glycoalkaloids on Zophobas atratus

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Insect Science 2015年第2期22卷 251-262页

作者： Emanuela Ventrella Pawel.marciniak Zbigniew Adamski Grzegorz Rosirnski Szymon Chowanski Patrizia Falabella laura Scrano SabinoA. Bufo Department of Science University of Basilicata Potenza Italy Department of Animal Physiology and Development Adam Mickiewicz University Poznan Poland Electron and Confocal Microscope laboratory Adam Mickiewicz University Poznan Poland Department of European and Mediterranean Cultures University of Basilicata Matera Italy

Glycoalkaloids, the biologically active secondary metabolites produced by Solanaceae plants, are natural defenses against animals, insects and fungi. In this paper, the effects of glycoalkaloids present in extracts of Solanaceae plants （potato, tomato and black nightshade） or pure commercial glycoalkaloids on the coleopteran Zophobas atratus E were evaluated by in vitro and in vivo bioassays using heart experimental models. Each tested extract induced a dose-dependent cardioinhibitory effect. The perfusion of Zophobas atratus semi-isolated heart using the highest potato and tomato extract concentration （1 mmol/l） caused irreversible cardiac arrests, while extract from black nightshade pro- duced fast but reversible arrests. Pure commercial glycoalkaloids caused similar but less evident effects compared with extracts. Our results showed that the bioactivity of tested compounds depended on their structure and suggested the existence of synergistic interac- tions when combinations of the main glycoalkaloids of potato and black nightshade were used for trials. Surprisingly, injection of tomato and potato extracts in 1-day-old pupae of Zophobas atratus induced reversible positive chronotropic effects and decreased the duration of the both phases （anterograde and retrograde） of the heart contractile activity. Furthermore, these extracts affected the amplitude of the heart contractions.

关键词： cardioinhibitory effect glycoalkaloid heart perfusion Solanaceae Zophobas atratus

Mn^(5+)-activated Ca_(6)Ba(PO_(4))_(4)O near-infrared phosphor and its application in luminescence thermometry

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light(Science & Applications) 2022年第10期11卷 2463-2475页

作者： Miroslav D.Dramicanin lkasz marciniak Sanja Kuzman Wojciech Piotrowski Zoran Ristic Jovana Perisa Ivana Evans Jelena Mitric Vesna Dordevic Nebojsa Romcevic Mikhail G.Brik Chong-Geng Ma School of Optoelectronic Engineering&CQUPT-BUl Innovation Institute Chongqing University of Posts and TelecommunicationsChongqing 400065PR China Centre of Excellence for Photoconversion Vinca Institute of Nuclear Sciences-National Institute of the Republic of SerbiaUniversity of BelgradeP.O.Box 522Belgrade 11001Serbia Institute of low Temperature and Structure Research Polish Academy of SciencesOkólna 250-422 WroclawPoland Department of Chemistry Durham UniversityDurham DH13LEUK Institute of Physics University of BelgradePregrevica 11811080 BelgradeSerbia Institute of Physics University of TartuTartu 50411Estonia Department of Theoretical Physics Jan D?ugosz UniversityCzestochowa PL 42200Poland Academy of Romanian Scientists Ilfov Str.No.3050044 BucharestRomania

The near-infrared luminescence of Ca_(6)Ba(PO_(4))_(4)O∶Mn^(5+)is demonstrated and *** excited into the broad and strong absorption band that spans the 500-1000 nm spectral range,this phosphor provides an ultranarrow(FWHM=5 nm)emission centered at 1140 nm that originates from a spin-forbidden ^(1)E → ^(3)A_(2) transition with a 37.5%internal quantum efficiency and an excited-state lifetime of about 350 μ*** derived the crystal field and Racah parameters and calculated the appropriate Tanabe-Sugano diagram for this *** found that 1E emission quenches due to the thermally-assisted cross-over with the ^(3)T_(2) state and that the relatively high Debye temperature of 783 K of Ca_(6)Ba(PO_(4))_(4)O facilitates efficient *** Ca_(6)Ba(PO_(4))_(4)O also provides efficient yellow emission of the Eu^(2+)dopant,we calculated and explained its electronic band structure,the partial and total density of states,effective Mulliken charges of all ions,elastic constants,Debye temperature,and vibrational ***,we demonstrated the application of phosphor in a luminescence intensity ratio thermometry and obtained a relative sensitivity of 1.92%K^(-1) and a temperature resolution of 0.2 K in the range of physiological temperatures.

关键词： spectra. luminescence excited