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Photolumi.escence properti.s of nanosi.ed stronti.m-yttri.m borate phosphor Sr_3Y_2(BO_3) _4:Eu^(3+) obtai.ed by the sol-gel Pechi.i.method

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Journal of Rare Earths 2011年第12期29卷 1161-1165页

作者： A.A.Shyi.huk S.lis Department of Rare Earth Faculty of ChemistryAdam Mickiewicz Uniwersity

Mi.ed stronti.m-yttri.m borate phosphor Sr3Y2（BO3）4 doped wi.h Eu^3＋ i.ns was obtai.ed by the sol-gel Pechi.i.method. Crystal structure of the synthesi.ed compound was analyzed by X-ray powder di.fracti.n. Opti.al condi.i.ns for the synthesi. were found. Photophysi.al properti.s of the phosphor samples were i.vesti.ated by collecti.g exci.ati.n and lumi.escence spectra as well as measuri.g lumi. nescence li.eti.e. Judd-Ofelt analysi. showed that Eu^3＋ i.ns occupi.d Y^3＋ si.es i. the crystalli.e network. The studi.d compound showed a red emi.si.n wi.h the quantum yi.ld of 54%-55% and can be potenti.lly used as phosphor for plasma di.play panels and lumi.escent tubes.

关键词： stronti.m-yttri.m borate lumi.ophor Eu^3+ sol-gel method rare earths

Synthesi. of lumi.escent KY_3F_(10) nanopowder multi.doped wi.h lanthani.e i.ns by a co-preci.i.ati.n method

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Journal of Rare Earths 2016年第8期34卷 808-813页

作者： Szymon Goderski.Marci. Runowski.Stefan lis Department of Rare Earths Faculty of Chemistry Adam Mickiewicz University

A seri.s of KY3F10 nanophosphors doped wi.h Gd3＋, Ce3＋ and Eu3＋ i.ns were obtai.ed wi.h the use of a co-preci.i.ati.n method. The resulti.g products were whi.e preci.i.ates, consi.ti.g of spheri.al parti.les wi.h di.meter about 150-200 nm, whi.h was confi.med usi.g transmi.si.n electron mi.roscopy （TEM） techni.ue. Powder X-ray di.fracti.n （XRD） and energy di.persi.e X-ray analysi. （EDX） measurements confi.med appropri.te structures of the nanoparti.les obtai.ed. Spectroscopi. properti.s of the prod- ucts were exami.ed on the basi. of the measured exci.ati.n/emi.si.n spectra and lumi.escence decay curves. The synthesi.ed sam- ples showed orange-red lumi.escence, characteri.ti. for Eu3＋ i.ns. The reacti.n process was performed i. requi.ed alkali.e pH ad- justed wi.h the use of ethylenedi.mi.etetraaceti. aci. （EDTA） and potassi.m hydroxi.e. The samples contai.i.g large amounts of Gd3＋ dooant i.ns exhi.i.ed a tendencv to form nroducts wi.h di.ferent momhologi.s.

关键词： : fluori.es co-preci.i.ati.n nanophosphors lumi.escence nanopowders Ce3+/Gd3+/Eu3+ dopi.g rare earths

Preparati.n of stable colloi.al suspensi.ns of superdi.i.tegrants vi. wet sti.red medi. mi.li.g

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Parti.uology 2014年第3期12卷 76-82页

作者： Mohammad A.Azad Afolawemi.Afolabi.Ni.i.a Patel Rajesh davé Ecevi. Bi.gi.i Otto H.York Department of Chemi.al Biologicaland Pharmaceutical EngineeringNew Jersey Institute of TechnologyNewarkNJUSA

Superdi.i.tegrants are cross-li.ked polymers that can be used as di.persants for fast release of drug nanoparti.les from nanocomposi.e mi.roparti.les duri.g i. vi.ro and i. vi.o di.soluti.n. Currently avai.- able superdi.i.tegrant parti.les have average si.es of approxi.ately 5-130 μm, whi.h are too bi. for drug nanocomposi.e appli.ati.ns. Hence, producti.n of stable superdi.i.tegrant suspensi.ns wi.h less than 5 μm parti.les i. desi.able. Here, we explore the preparati.n of colloi.al suspensi.ns of ani.ni. and noni.ni. superdi.i.tegrants usi.g a wet sti.red medi. mi.l and assess thei. physi.al stabi.i.y. Sodi.m starch glycolate （SSG） and crospovi.one （CP） were selected as representati.e ani.ni. and noni.ni. superdi.i.tegrants, and hydroxypropyl cellulose （HPC） and sodi.m dodecyl sulfate （SDS） were used as a steri. stabi.i.er and a wetti.g agent/stabi.i.er, respecti.ely. Parti.le si.i.g, scanni.g electron mi.roscopy, and zeta potenti.l measurements were used to characteri.e the suspensi.ns. Colloi.al superdi.i.tegrant suspensi.ns were prepared reproduci.ly. The extensi.e parti.le breakage was attri.uted to the swelli.g-i.duced softeni.g i. water. SSG suspensi.ns were stable even i. the absence of stabi.i.ers, whereas CP suspensi.ns requi.ed HPC-SDS for mi.i.i.i.g parti.le aggregati.n. These fi.di.gs were explai.ed by the hi.her absolute （negati.e） zeta potenti.l of the suspensi.ns of the ani.ni. superdi.i.tegrant （SSG） as compared wi.h those of the noni.ni. superdi.i.tegrant （CP）.

关键词： Colloi.al suspensi.ns Di.persants Physi.al stabi.i.y Superdi.i.tegrants Swelli.g Wet sti.red medi. mi.li.g

Photolumi.escent properti.s of LaF_3:Eu^(3+) and GdF_3:Eu^(3+)nanoparti.les prepared by co-preci.i.ati.n method

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Journal of Rare Earths 2009年第4期27卷 588-592页

作者： T.Grzyb S.lis Department of Rare Earths Faculty of Chemistry Adam Mickiewicz University

GdF3：Eu^3＋ and GdF3：Eu^3＋ nanoparti.les were prepared by a co-preci.i.ati.n method i. the presence of the chelati.g agent, ci.ri. aci.. The structural properti.s of the products were characteri.ed by X-ray di.fracti.n （XRD） and transmi.si.n electron mi.roscopy （TEM）. The average crystalli.e si.e was esti.ated from the full-wi.th at half-maxi.um （FWHM） of the di.fracti.n peaks by the Scherrer equati.n. The si.es of the nanoparti.les were 12 nm for LaF3：Eu3＋ and 17 nm for GdF3：Eu^3＋. The lumi.escent properti.s of the nanoparti.les were i.vesti.ated by exci.ati.n and emi.si.n spectra. Energy transfer from Gd3＋ to Eu3＋ was observed.

关键词： nanofluori.es phosphors lumi.escence energy transfer rare earths

Photolumi.escence and electrochemi.umi.escence studi.s of chosen rare earths systems

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Journal of Rare Earths 2008年第2期26卷 192-197页

作者： Stefan lis Slawomi. But Krzysztof Stani.ski.Moni.a Jesi.lowska Department of Rare Earths Faculty of Chemistry Adam Mickiewicz University Grunwaldzka 6

Eu（Ⅲ） complexes wi.h chosen Keggi. polyoxomatalates, POM, contai.i.g organi. counter cati.ns （tetrabutylarnmoni.m, tetrabutylphosphoni.m, tri.henylethylphosphoni.m）, were synthesi.ed, and thei. photophysi.al properti.s were studi.d. The synthesi.ed complexes had the general formula of XnH5-n[EuSi.11O39], formulated based on the results of elemental and thermogravi.etri. analysi. and FTi. spectroscopy. The photophysi.al properti.s of the obtai.ed compounds were i.vesti.ated usi.g photolumi.escence and electrochemi.umi.escence, ECL, methods i. soluti.ns and soli.s. The most i.tense lumi.escence of Eu（Ⅲ） was observed for the complexes wi.h tetrabutylarnmoni.m cati.ns. After the addi.i.n of phenanthroli.e to the XnH5-n[EuSi.11O39] soluti.ns, a large i.crease i. the Eu（Ⅲ） lumi.escence i.tensi.y and a lengtheni.g of i.s lumi.escence li.eti.e were observed as a result of the formati.n of ternary complexes. Attempts to apply ECL as a method of li.ht emi.si.n by generati.g speci.s capable of formi.g exci.ed states i. Ln/POMs, i.e., Tb（Ⅲ） and Eu（Ⅲ） i. the Na9EuW10O36 and Na9TbW10O36 complexes, were made. The i.fluence of the POM complexes on the ECL was also tested usi.g the Tb/EDDHA （EDDA=ethylenedi.mi.e di.o-hydroxyphenylaceti. aci.）） complex, whi.h i. effecti.e i. generati.g ECL.

关键词： Ln(Ⅲ) lumi.escence electrochemi.umi.escence polyoxometalates complexes rare earths

Structure modeli.g of terbi.m doped stronti.m-lanthanum borate

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Journal of Rare Earths 2014年第3期32卷 248-253页

作者： A.Shyi.huk S.lis G.Mei.rath Department of Rare Earths Faculty of Chemistry Adam Mickiewicz University Radi.acti.i.y Envi.onment Remedi.ti.n (RER) Consultants

Terbi.m doped stronti.m-lanthanum borate, Sr3La2（BO3）4：Tb （SLB）, was studi.d by semi.empi.i.al computati.nal ap- proaches usi.g PM6 parametri.ati.n and the SPARKLE model for lanthani.e（Ⅲ）（Ln（Ⅲ）） cati.ns. The focus of i.terest was on structural aspects, e.g. the cell parameters and di.tri.uti.n of dopant i.ns between vari.us si.es as a functi.n of dopant concentrati.n. The cell li.ear di.ensi.ns were calculated to decrease li.early wi.h i.creasi.g dopant molar concentrati.n. SLB offered two si.es for the dopant. Calculati.ns predi.ted that one of these si.es should be preferred by the Tb（Ⅲ） dopant. The opti.i.ed cell di.ensi.ns as well as the total energi.s di.fered for structures wi.h dopant exclusi.ely i. si.e 1 or si.e 2. Computati.nal predi.ti.ns were tested agai.st experi.ental results obtai.ed for SLB synthesi.ed by sol-gel method varyi.g the dopant concentrati.n. The agreement be- tween experi.ental and computati.nal results was found suffi.i.ntly promi.i.g to conti.ue the computati.nal studi.s.

关键词： stronti.m-lanthanum borate terbi.m structure calculati.ns rare earths

Synthesi., structural and spectroscopi. studi.s on GdBO_3:Yb^(3+)/Tb^(3+)@Si._2 core-shell nanostructures

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Journal of Rare Earths 2015年第11期33卷 1148-1154页

作者： Konrad Kubasi.wi.z Marci. Runowski.Stefan lis Agata Szczeszak Department of Rare Earths Faculty of Chemistry Adam Mickiewicz University

The presented study concerned up-converti.g core/shell type nanomateri.ls based on lanthani.e（Ⅲ） i.ns, Ln（Ⅲ）, doped orthoborates. The system studi.d composed of the GdBO3 doped wi.h Yb^3＋/Tb^3＋ lumi.escent core ensured an effecti.e cooperati.e sensi.i.ati.n up-conversi.n, resulti.g i. a bri.ht green lumi.escence. The si.i.a coati.g process was performed by a modi.i.d St？ber method, whi.h resulted i. the formati.n of core-shell nanostructures, maki.g them sui.able for bi.appli.ati.ns. The nanophosphors and nanocomposi.es were obtai.ed by vari.us methods, such as co-preci.i.ati.n i. the presence of Tri.on X-100 and mi.elle synthesi. wi.h ethylenedi.mi.etetraaceti. aci.（EDTA） as organi. modi.i.rs/surfactants. The synthesi.ed nanomateri.ls were characteri.ed wi.h the use of powder X-ray di.fracti.n（XRD）, i.frared li.ht absorpti.n wi.h Fouri.r transform FT-i. spectra, transmi.si.n electron mi.roscopy（TEM）, up-conversi.n emi.si.n spectra under i. li.ht, as well as exci.ati.n spectra, emi.si.n spectra and fluorescence li.eti.es under UV li.ht, and thei. photophysi.al properti.s were compared.

关键词： Ln(Ⅲ) i.ns GdB O3 si.i.a coati.g core-shell nanocomposi.es up-conversi.n cooperati.e sensi.i.ati.n rare earths

Spectroscopi. properti.s of Eu^(3+) doped YBO_3 nanophosphors synthesi.ed by modi.i.d co-preci.i.ati.n method

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Journal of Rare Earths 2011年第12期29卷 1142-1146页

作者： A.Szczeszak S.lis V.Nagi.nyi Department of Rare Earths Faculty of ChemistryAdam Mickiewicz University i.sti.ute of Physi.s University of Tartu

Y1-xEuxBO3 nanophosphors were synthesi.ed by a modi.i.d co-preci.i.ati.n method. The structure of the obtai.ed nanocrystals was determi.ed by X-ray di.fracti.n （XRD） and transmi.si.n electron mi.roscopy （TEM）. The average crystalli.e si.e was calculated from the full-wi.th at half-maxi.um （FWHM） of the di.fracti.n peaks by the Scherrer equati.n. The average parti.les si.e was 25±10 nm. The spectroscopi. properti.s of the Y1-xEuxBO3 nanoborates were characteri.ed by exci.ati.n and emi.si.n spectra under UV and VUV exci.ati.n. i. order to i.prove colour puri.y, the chromati.i.y coordi.ates were also calculated.

关键词： YBO3:Eu^3+ co-preci.i.ati.n nanophosphor lumi.escence VUV rare earths

Nanosi.ed complex fluori.es based on Eu^(3+) doped Sr_2LnF_7(Ln=La, Gd)

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Journal of Rare Earths 2014年第3期32卷 242-247页

作者： M.Runowski.S.Balabhadra S.lis Department of Rare Earths Faculty of Chemistry Adam Mickiewicz University

A si.ple co-preci.i.ati.n approach taki.g place between Ln3＋, Sr2＋ cati.ns and F ani.ns, led to the formati.n of nanocrystalli.e Eu3＋ doped Sr2LnF7 （Ln-La and Gd） complex fluori.es. The reacti.n was carri.d out i. the presence of polyeth- ylene glycol, PEG 6000 as a surfactant/surface modi.i.r, provi.i.g small si.e and homogenei.y of the products. The synthesi.ed compounds were composed of small nanoparti.les wi.h an average si.e of 15 nm. All obtai.ed Eu3＋ doped compounds exhi.i.ed an i.tensi.e red lumi.escence. i. the case of gadoli.i.m based compounds, the energy transfer phenomena could be observed from Gd3＋ i.ns to Eu3＋ i.ns. i. order to study the structure and morphology of the synthesi.ed fluori.es, powder X-ray di.fracti.n （XRD） and transmi.si.n electron mi.roscopy （TEM） measurements were performed. Also FT-i. spectra of the products were re- corded, reveali.g the presence of PEG molecules on the nanoparti.les suN＇ace. A spectrofluorometry techni.ue was appli.d to exami.e opti.al properti.s of the synthesi.ed nanoparti.les. Exci.ati.n and emi.si.n spectra as well as lumi.escence decay curves were measured and analysed. The performed analysi. revealed a red lumi.escence, typi.al for the Eu3＋ i.n si.uated i. the i.organi., hi.hly symmetri. matri.. Concentrati.n quenchi.g phenomena and li.eti.es shorteni.g, together wi.h an i.creasi.g of the Eu3＋ dopi.g level, were observed and di.cussed. Judd-Ofelt analysi. was also performed for all doped samples, i. order to support the regi.tered spectroscopi. data and exami.e i. detai.s structural and optoelectroni. properti.s of the synthesi.ed nanomateri.ls.

关键词： lumi.escence Eu3+ dopi.g complex stronti.m lanthani.e fluori.es nanoparti.les Sr2LnF7 Sr0.69La0.31F2.31 rare earths