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43篇 您的检索式:作者名="Hreniak"
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1Laser-induced white-light emission from graphene ceramics–opening a band gap in graphene显示文摘Recent theoretical and experimental studies have indicated the existence of a new stable phase of carbon with mixed sp^(2) and sp^(3) hybridized bonds—diaphite.Such a two-layered structure with sp^(2)/sp^(3) bonds may be observed after the photostimulation of highly oriented pyrolytic graphene with femtosecond laser pulses.This hidden multistability of graphene may be used to create a semiconducting phase immersed in the semimetallic continuum,resulting in bandgap opening.We demonstrate that bandgap opening and light emission from graphene is possible using continuous-wave laser beams with wavelengths from the visible(405 nm)to the near-infrared range(975 nm).We demonstrate that without the application of cooling,the effective temperature of the emitting sample remains lower than 900 K,which is far below the value predicted by the theory of black-body radiation.Moreover,light emission from a graphene sample may be observed at temperatures as low as 10 K.Wieslaw Strek Bartlomiej Cichy Lukasz Radosinski Pawel Gluchowski Lukasz Marciniak Mikolaj Lukaszewicz Dariusz Hreniak 2015Light(Science & Applications)2015,4,1:6
2Laser induced broadband white emission of Y2Si2O7 nanocrystals显示文摘The generation of broadband white emission of theα-Y2Si2O7 nanocrystals was observed upon excitation by focused beam ofCW lasers operating in near infrared,visible and blue regions.The influence of excitation energy on order of process is presented.The temperature of sample emitting laser induced white emission(LIWE)was determined by luminescence nanothermometry technique.It is found that the temperature is much lower than that predicted by blackbody model characterized with the same energy.It is shown that the LIWE is accompanied by efficient photocurrent.An origin of white emission is discussed in terms of multiphoton ionization process leading to the inter valence charge transfer emission.Robert Tomala Dariusz Hreniak Wieslaw Strek 2019Journal of Rare Earths2019,37,11:2
3Synthesis and characterization of monodisperse Eu^3+ doped gadolinium oxysulfide nanocrystals显示文摘Gd_2O_2S:Eu^(3+) nanoparticles were synthesized using two step process consisting of sulfuration of basic carbonates obtained by homogenous precipitation.Annealing of lanthanide nitrates at total concentration of 5×10^(-3) mol/L in a water solution containing relatively high,three molar concentration of urea ensured the optimal conditions for the reproducible preparation of uniform and small spherical particles.During sulfuration step elemental sulfur was mixed with precursor which eliminated necessity of using an auxiliary furnace and provided sulfur-reach reaction atmosphere.Such optimized protocol afforded synthesis of spherical and non-agglomerated nanoparticles with diameter smaller than 100 nm.The precursors morphology was maintained,but particles size was reduced by 15%-20%during sulfuration.The results indicated that higher emission intensity was observed for Gd_2O_2S:Eu^(3+)(8%)oxysulfide sample synthesized using crystalline Gd(CO_3)OH precursor,than for that obtained from amorphous Gd_2(OH)_2(CO_3)_2·H_2O precursor,although some further efforts to improve morphology of the former are still required.J. Cichos M. Karbowiak D. Hreniak W. Strek 2016Journal of Rare Earths2016,34,8:2
4The concentration dependence of luminescence of Nd:Y3Al5O12 nanoceramics显示文摘Hreniak D Strek W Guchowski P 2008J Alloys Compd2008,451,12:1
5Low-voltage cathodolumi-nescence properties of Y3Al50j2 : Tb3+ nanopowders 显示文摘PSUJA P HRENIAK D STREK W 2008Jour-nal of Alloys and Compounds2008,451,12:1
6显示文摘Hreniak D Zych E Kepinski L 2003J Phys Chem Solids2003,64,:1
7Spectroscopic Properties of Lu2O3/Eu3+ Nanocrystalline Powders and Sintered Ceramics显示文摘Zych E Hreniak D Strek W 2002J Phys Chem B2002,106,:1
8Method of preparation and structural properties of transparent YAG nanoceramics显示文摘Robert Fedyk Dariusz Hreniak Witold Lojkowski 2007Opt Mater2007,29,:1
9Biosensor Applications of Luminescence Depolarization Effects in Protein-modified Silica Films Doped with Organic Luminophores显示文摘HRENIAK A RYBKA J GAMIANB A 2006Journal of Luminescence2006,,:1
10Optical properties of Eu(Ⅲ) doped nanocrystalline films of TiO2显示文摘Hreniak A Nyk M Hreniak D Strek W Kempinski L Misiewicz J Maruszewski K 0,,:1
11Enhancement of luminescence properties of Eu3+ : YVO4 in polymeric nanocomposites upon UV excitation 显示文摘Hreniak D Doskocz J Gluchowski P 2011J Lumin2011,131,3:1
12Photoluminescence and cathodolum inescence of Tb-doped Al2O3-ZrO2 nanostructures obtained by sol-gel method 显示文摘ZawadzkiI M Hreniak D Wrzyszcz J 2003Chemical Physic s2003,291,3:1
13Rare earth doped nanocrystalline phosphors for field emission displays显示文摘Psuja P Hreniak D Strek W 0,,:1
14Synthesis and optical properties of Nd3+-doped Y3Al5O12nanoceramics显示文摘HRENIAK D STREK W 2002Journal of Alloys andCompounds2002,341,12:1
15Microwave Driven Hydrothermal Synthesis of Ba1l-x SrxTiO3 Nanoparticles 显示文摘Pazik R Hreniak D Strek W 2007Materials Research Bulletin2007,42,7:1
16Speca-oscopic properties of Lu2O3:Eu3+ nanocrystalline powders and sintered ceramics 显示文摘ZYCH E HRENIAK D STREK W 2002J Phys Chem B2002,106,15:1
17Synthesis and optical properties of Nd^3+-doped Y3Al5O12 nanoceramics显示文摘HRENIAK D STREK W 2002J Alloy Compounds2002,341,:1
18Effect of grain size and concentration of active ions on structural and optical behavior of Eu3+-doped Y3Al5O12 nanocrystallites显示文摘Hreniak D H(o)ls(a) J Lastusaari M Strek W 0,,:1
19Luminescence properties of Tb∶Y3Al5O12 nanocrystallites prepared by the sol-gel method显示文摘 Strek W Mazur P 2004Optical Materials2004,26,:1
20Microwave driven hydrotherreal synthesis of Ba1-xSrxTiO3 nanoparticles显示文摘Pazik R Hreniak D Strek W 2007Mater Res Bull2007,42,:1
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