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Synthesis and enhanced photoluminescence properties of red emitting divalent ion(Ca^(2+))doped Eu:Y_(2)O_(3)nanophosphors for optoelectronic applications

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Journal of Rare Earths 2022年第8期40卷 1187-1198页

作者： Arpita Dwivedi Monika Srivastava Ankur Dwivedi Amit Srivastava Anurag Mishra S.K.Srivastava Department of Physics Institute of ScienceBanaras Hindu University(BHU)Varanasi221005India School of Materials Science and Technology Indian Institute of Technology(BHU)Varanasi221005India Department of Mining Engineering Indian Institute of Technology(BHU)Varanasi221005India Department of Physics TDPG College VBS Purvanchal UniversityJaunpur222001India

This work presents the synthesis of Y_(2)O_(3):Eu^(3+),χCa^(2+)(χ=0 mol%,1 mol%,3 mol%,5 mol%,7 mol%,9 mol%,11 mol%)nanophosphors with enhanced photoluminescence properties through a facile solution combustion method for optoelectronic,display,and lighting *** X-ray diffraction(XRD)patterns of the proposed nanophosphor reveal its structural properties and crystalline *** transmission electron microscope(TEM)results confirm the change in the shape of the particle and aggregation of particles after co-doping with Ca^(2+).Fourier transform infrared spectroscopy(FTIR)and Raman vibrations also confirm the presence of Y-O vibration and subsequently explain the crystalline nature,structural properties,and purity of the *** the synthesized nanophosphors samples emit intense red emission at 613 nm(~5D_(0)→~7 F_(2))under excitation with 235,394 and 466 nm wavelengths of Eu^(3+)*** photoluminescence(PL)emission spectra excited with 235 nm illustrate the highest emission peak with two other emission peaks excited with 466 and 394 nm that is 1.4 times higher than 466 nm and 1.9 times enhanced by 394 nm wavelength,*** emission intensity of Y_(2)O_(3):Eu^(3+),χCa^(2+)(5 mol%)is increased 8-fold as compared to Eu:Y_(2)O_(3).Doping with Ca^(2+)ions enhances the emission intensity of Eu:Y_(2)O_(3)nanopho sphors due to an increase in energy transfer in Ca^(2+)→Eu^(3+)through asymmetry in the crystal field and by introduction of radiative defect centers through oxygen vacancies in the yttria *** is also observed that the optical band gap and the lifetime of the~5D_(0)level of Eu^(3+)ions in Y_(2)O_(3):Eu^(3+),xCa^(2+)nanophosphor sample gets changed with a doping conce ntration of Ca^(2+)*** also reveals high thermal stability and quantum yield as estimating activation energy of 0.25 eV and 81%,***,CCT,and color purity values(>98%)show an improved red-emitting nanophosphor in the warm region of light,which m

关键词： Red emission Photoluminescence(PL) Y_(2)O_(3):Eu^(3+),xCa^(2+) Rare earths nanophosphors LEDs

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Synthesis and spectroscopic investigations of trivalent europium- doped Z_(2)Si_(3)O_(8)(Z = Mg, Ca and Sr) nanophosphors for display applications

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Rare Metals 2021年第9期40卷 2610-2617页

作者： Suman Sheoran Kuldeep Singh Vijeta Tanwar Sitender Singh Anura Samantilleke Devender Singh Department of Chemistry Maharshi Dayanand UniversityRohtak 124001India Centro de Fisica Universidade of MinhoBraga 4710057Portugal

To explore the silicate lattice-based nanophosphors, a series of Eu3+-doped Z_(2)Si_(3)O_(8)(Z = Mg, Ca and Sr) materials were prepared by sol–gel procedure. The metal nitrates and silica powder were used as precursor components for the synthesis of these luminescent materials. Photoluminescence(PL) emission spectra, powder X-ray diffraction(PXRD), energy-dispersive X-ray spectroscopy(EDS), Fourier transform infrared spectroscopy(FTIR) and transmission electron microscopy(TEM)spectroscopic techniques were applied for the characterization of the fabricated materials. Three peaks were observed at 589, 613 and 650–652 nm corresponding to ^(5)D_(0)→^(7)F_(1-3) transition in PL emission spectra. Upon395 nm excitation and at 0.03 mol Eu3+, these nanophosphors displayed optimum photoluminescence with the most intense peak analogous to ^(5)D_(0)→^(7)F_(2)transition of dopant ion. The as-prepared phosphor materials were re-heated at1050 and 1150 ℃ to observe the consequences of higher temperatures on the emission intensity and crystal *** analysis confirmed that all the synthesized materials were of crystalline nature, and the crystallinity was observed to be improved by increasing the temperature. In the FTIR spectrum, peaks at 483 and 610 cm^(-1) proved the existence of SiO_(4)group in Ca_(2)Si_(3)O_(8), and the peak centered at 417 cm^(-1) confirmed the presence of MgO6 octahedral in Mg_(2)Si_(3)O_(8) materials. TEM images were used to determine the particle size(13–35 nm) and to study the threedimensional structure of nanophosphor materials. The experimental studies indicate that these materials may be promising as red-emitting nanophosphors for white lightemitting diodes.

关键词： Z_(2)Si_(3)O_(8) nanophosphors Sol–gel Photoluminescence Crystalline

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Upconversion luminescence of Gd2O3:Er3+and Gd2O3:Er3+/silica nanophosphors fabricated by EDTA combustion method

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Journal of Rare Earths 2019年第11期37卷 1126-1131页

作者： Le Quoc Minh Tran Kim Anh Nguyen Duy Hung Pham Thi Minh Chau Nguyen Thi Quy Hai Ho Van Tuyen Vu Thi Thai Ha Vu Duc Tu Wieslaw Strek Institute of Theoretical and Applied Research Duy Tan UniversityDa Nang 55000Viet Nam Advanced Institute for Science and Technology Hanoi University of Science and Technology1 Dai Co VietHai Ba TrungHanoiViet Nam Institute of Materials Science Vietnam Academy of Science and Technology18 Hoang Quoc Viet RoadCau Giay DistrictHanoiViet Nam Institute of Low Temperature and Structure Research Polish Academy of Science 2 OkolnaWroclawPoland

Gd2O3:Er^3+nanophosphors were fabricated by the combustion method in presence of Na2 ethylene diamine tetra acetic acid(EDTA-Na2)as fuel at not high temperature(≤350℃)within a very short time of 5 *** added concentration of Er^3+ions in Gd2O3 matrix was changed from 0.5 mol%to 5.0 mol%.The X-ray diffraction pattern of samples indicates the monoclinic structure of Gd2O3:Er^3+.The morphology and chemical composition analysis of the Gd2O3:Er^3+samples are characterized by a field emission scanning electron microscope(FESEM)and a Fourier-transform infrared spectrometer(FTIR).The photoluminescence(PL),photo luminescence excitation(PLE)and upconversion(UC)at room temperature of the prepared materials with different concentrations of Er^3+were *** PL of Gd2O3:Er^3+nanomaterials are shown in visible at 545,594,623,648,688 nm under excitation at 275 *** emission bands from transitions of Er^3+from 2P3/2 to 4F9/2 are observed,UC luminescent spectra of the Gd2O3:Er^3+/silica nanocomposites under 976 nm excitation show the bands at 548 and 670 *** influence of excitation power at 980 nm for transitions were measured and *** results indicate that the upconversion process of Gd2O3:Er^3+/silica is two photons absorption *** low temperature dependence of UC luminescent intensities of the main bands of Gd2O3:Er^3+was investigated towards development of a nanotemperature sensor in the range of 10-300 K.

关键词： Upconversion luminescence Gd2O3:Er3+ Gd2O3:Er3+/silica nanophosphors EDTA combustion Rare earths

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Upconversion luminescence of Tb3+ and Yb3+ co-doped hexagonal and monoclinic GdPO4 nanophosphors

Upconversion luminescence of Tb3+ and Yb3+ co-doped hexagona...

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第十二届固态化学与无机合成学术会议

作者：潘跃晓浙江省温州大学化学与材料工程学院

Tb and Yb codoped hexagonal GdPO nanorods have been prepared by a hydrothermal method at 220℃for 12 h and monocline GdPO nanoparticles have been obtained by sintering the hydrothermal products at 900℃for 5 *** upconversion luminescence of Tb has been observed when pumped by 980 nm diodes since efficiently cooperative energy transfer from codopant *** luminescence of Tb in both hexagonal and monocline GdPO nanophosphors has been comparatively *** dependence of the upconversion luminescence intensity on pump laser power shows that two-phonon processes are involved in upconversion luminescence of the emission level D of Tb is populated via two-photon process Upconversion luminescence emission intensity upon the concentration of Tb and Yb in Tb and Yb co-doped monoclinic GdPO nanocrystals has also been investigated.

关键词： Luminescence Upconversion nanophosphors Cooperative energy transfer

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Persistent luminescence from Y3Al2Ga3O12 doped with Ce3+ and Cr3+ after X-ray and blue light irradiation

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Journal of Rare Earths 2019年第11期37卷 1200-1205页

作者： V.Boiko J.Zeler M.Markowska Z.Dai A.Gerus P.Bolek E.Zych D.Hreniak Institute of Low Temperature and Structure Research Polish Academy of SciencesOkolna 2PL-50-422 WroclawPoland Faculty of Chemistry University of WroclawF.Joliot-Curie 14PL-50-383 WroclawPoland

The persistent luminescence(PersL)dependence on the dopants and derived mechanism of trapping and de-trapping processes were investigated in Y3Al2Ga3O12(YAGG)based nanophosphor,doped with Ce^3+and/or Cr^3+.It is found that the presence of Cr^3+ions produce electron and hole traps and capture suitable charge after X-ray *** effect of irradiation on the carriers trapping and their pathways after excitation was studied by means of thermo luminescence *** the other hand,for blue light irradiation the mechanism seems to be *** the latter case,the Ce^3+ions,having the position of energy levels in the conduction band,become sensitizers for the electrons and main emission centres for the PersL(de-trapping process goes through Ce^3+).

关键词： Persistent luminescence Thermoluminescence YAGG nanophosphors Lanthanides X-ray Blue-light irradiation

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Synthesis of luminescent KY_3F_(10) nanopowder multi-doped with lanthanide ions by a co-precipitation method

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

作者： Szymon Goderski Marcin Runowski Stefan Lis Department of Rare Earths Faculty of Chemistry Adam Mickiewicz University

A series of KY3F10 nanophosphors doped with Gd3＋, Ce3＋ and Eu3＋ ions were obtained with the use of a co-precipitation method. The resulting products were white precipitates, consisting of spherical particles with diameter about 150-200 nm, which was confirmed using transmission electron microscopy （TEM） technique. Powder X-ray diffraction （XRD） and energy dispersive X-ray analysis （EDX） measurements confirmed appropriate structures of the nanoparticles obtained. Spectroscopic properties of the prod- ucts were examined on the basis of the measured excitation/emission spectra and luminescence decay curves. The synthesized sam- ples showed orange-red luminescence, characteristic for Eu3＋ ions. The reaction process was performed in required alkaline pH ad- justed with the use of ethylenediaminetetraacetic acid （EDTA） and potassium hydroxide. The samples containing large amounts of Gd3＋ dooant ions exhibited a tendencv to form nroducts with different momhologies.

关键词： : fluorides co-precipitation nanophosphors luminescence nanopowders Ce3+/Gd3+/Eu3+ doping rare earths

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Synthesis and luminescence of Eu3+ doped nanocrystalline TiO2 spheres

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Journal of Rare Earths 2019年第11期37卷 1121-1125页

作者： M.Lysien K.Fiaczyk R.Tomala F.Granek W.Strek Institute of Low Temperature and Structure Research Polish Academy of ScienceOkolna 2Wroclaw50-422Poland XTPL S.A. Stabtowicka 147Wroctaw54-066Poland

Eu^3+doped TiO2 anatase spheres were obtained by modified sol-gel ***(110-250 nm)are composed of smaller(5-15 nm)nanocrystals and exhibit red emission under UV light *** were synthesized by multi-step method from glycolated titania *** doped(1.0 mol%)and non-doped spheres were *** optical and structural properties were compared by materials characterization methods,such as X-ray powder diffraction,transmission electron microscopy and PL *** TiO2 spheres are crystalline phase pure and exhibit high luminescence intensity.

关键词： Titanium dioxide nanophosphors Rare earth elements Europium doped nanoparticles Luminescence

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Sol-gel synthesis and photoluminescence characterization of La_2Ti_2O_7:Eu^(3+) nanocrystals

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Rare Metals 2011年第6期30卷 602-606页

作者： CHENG Hua LU Zhouguang LIU Ying YANG Haihua GU Yingying LI Wei TANG Yougen College of Chemistry ＆ Chemical Engineering Central South University Changsha 410083 China

Eu3＋ doped La2Ti2O7 nanocrystals with pure monoclinic phase and size of about 100 nm were prepared by a citric acid （CA） assisted sol-gel method. Techniques of thermo-gravimetric （TG） and differential scanning calorimetry （DSC）, X-ray diffraction （XRD）, as well as transmission electron microscopy （TEM） were employed to characterize the as-synthesized nanoparticles. Furthermore, photoluminescence （PL） performances of the Eu3＋ doped La2Ti2O7 nanocrystals were evaluated with focus on the effects of calcination temperature and Eu3＋ doping concentration on the photoluminescence properties.

关键词： lanthanum titanate rare earth metals photoluminescence nanophosphors pechini citric acid sol-gel

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Synthesis and characterization of NaYF4:Yb3+,Er3+@silica-N=folic acid nanocomplex for bioimaginable detecting MCF-7 breast cancer cells

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Journal of Rare Earths 2019年第11期37卷 1183-1187页

作者： Ha Thi Phuong Tran Thu Huong Le Thi Vinh Hoang Thi Khuyen Do Thi Thao Nguyen Thanh Huong Pham Thi Lien Le Quoc Minh Institute of Materials Science Vietnam Academy of Science and Technology18 Hoang Quoc VietCau GiayHanoiViet Nam Graduate University of Science and Technology-Vietnam Academy of Science and Technology 18 Hoang Quoc VietCau GiayHanoiViet Nam Department of Chemistry Hanoi Medical University1-Ton That TungDong DaHanoiViet Nam Department of Chemistry Hanoi University of Mining and Geology18-Pho LienBac Tu LiemHanoiViet Nam Institute of Biotechnology Vietnam Academy of Science and Technology18-Hoang Quoc VietCau GiayHanoiViet Nam Duy Tan University K7/25 Quang TrungDa NangViet Nam

Upconversion nanophosphors are new promising nanomaterials to be used as biolabels for detection and imaging of cancer *** nanophosphors absorb long-wavelength excitation radiation in the infrared or near infrared region and emit shorter wavelength,higher energy radiation from ultraviolet to *** this paper,we studied the hydrothermal method and optical properties of the functionalized NaYF4:Yb^3+,Er^3+for biomedical *** synthesis,these NaYF4:Yb^3+,Er^3+nanophosphors were functionalized with aminosilanes and folic *** acid binds to the folate receptor on the surface of MCF-7 breast cancer cells and this binding promotes internalization of the nanophosphors via *** sizes of the functionalized NaYF4:Yb^3+,Er^3+@silica-N=FA(folic acid)nanophosphors can be controlled with length of the rod about 300-800 nm and diameter of the rod about 100-200 *** structure of NaYF4:Yb^3+,Er^3+is in hexagonal crystal *** photo luminescence(PL)spectra of the functionalized NaYF4:Yb^3+,Er^3+@silica-N=FA nanophosphors were *** nanophosphors emit in red color with the strongest band at 650 nm under 980 nm *** result can provide NaYF4:Er^3+,Yb^3+@silica-N=FA complex for developing fluorescence label and image tool in cancer biology and medicine.

关键词： Upconversion luminescence NaYF4:Yb^3+,Er^3+ nanophosphors Bioimaging Cancer cell Rare earths

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Synthesis and Characterization of Eu+++Doped Y2O3(Red Phosphor) and Tb+++Doped Y2O3(Green Phosphor) by Hydrothermal Processes

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World Journal of Nano Science and Engineering 2012年第1期2卷 13-18页

作者： Ravindra P. Singh Kiran Gupta Ashutosh Pandey Anjana Pandey Department of Chemistry Motilal Nehru National Institute of Technology Allahabad India Nanotechnology and Molecular Biology Laboratory Centre of Biotechnology University of Allahabad Allahabad India

Eu+++ and Tb+++ doped Y2O3 nanoparticles have been synthesized by hydrothermal process using yttrium oxo-isopropoxide Y5O(OPri)13 as precursor (OPri = isopropxy). X-ray diffraction (XRD), transmission electron microscopy (TEM), nanoparticle size analyzer and photoluminescence (PL) spectroscopy have been used to characterize these powders. The as synthesized powders gave very sharp peak in the X-ray diffraction suggesting crystalline particles with average particle size between 28 - 51 nm for Eu+++ doped Y2O3 nanoparticles and 43 - 51 nm for Tb+++ doped Y2O3 nanoparticles annealed at 300℃ for 3 h, 4 h and 5 h, which could be unique in comparison to other reports. Transmission electron micrograph investigation of the particles shows single dispersed particles along with agglomerates. The ratio of intensities of transitions in the europium and terbium emission spectrum have been used as structural probe to indicate the local environment around Eu+++ and Tb+++ in the Y2O3 particles.

关键词： Yttrium Oxo-Isopropoxide nanophosphors Y2O3:Eu+++ Y2O3:Tb+++ Hydrothermal Process

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