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PSN-PMN-PT∶Er3+晶体judd-ofelt理论分析

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人工晶体学报 2019年第12期48卷 2179-2185页

作者：张锦惠增哲何爱国王信哲王梓骅西安工业大学陕西省光电功能材料与器件重点实验室

为了探索Er^3+在铁电晶体场中的发光特性,采用高温溶液法生长了Er^3+掺杂Pb(Sc 1/2 Nb 1/2)O 3-Pb(Mg 1/3 Nb 2/3)O 3-PbTiO 3弛豫铁电单晶。该晶体在紫外-可见-近红外吸收光谱380~1800 nm波段出现了7个吸收峰;在980 nm泵浦光源照射下,... 详细信息

为了探索Er^3+在铁电晶体场中的发光特性,采用高温溶液法生长了Er^3+掺杂Pb(Sc 1/2 Nb 1/2)O 3-Pb(Mg 1/3 Nb 2/3)O 3-PbTiO 3弛豫铁电单晶。该晶体在紫外-可见-近红外吸收光谱380~1800 nm波段出现了7个吸收峰;在980 nm泵浦光源照射下,该晶体的发射光谱出现了强绿光和强红光上转换发射带,分别对应于Er 3+的4S 3/2→4I 15/2和4F 9/2→4I 15/2跃迁;利用judd-ofelt理论计算了晶体的振子强度三参数(Ω2=2.54×10^-20 cm^2,Ω4=1.36×10^-20 cm^2,Ω6=2.38×10^-20 cm^2)以及Er^3+在PSN-PMN-PT晶体场中的跃迁几率、能级寿命和荧光分支比。研究结果表明PSN-PMN-PT∶Er 3+弛豫铁电晶体是一种新型发光晶体。

关键词： judd-ofelt PSN-PMN-PT Er 3+掺杂上转换发光

用judd-ofelt理论计算YAG:Er3+晶体中Er3+的光谱参数

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光学学报 1986年第4期6卷 307-313页

作者：王庆元张思远武士学任英董向明中国科学院应用化学研究所

本工作根据Jndd-ofelt理论,利用28个吸收光谱支项,19组方程计算了实验与理论振子强度,均方根偏差仅为1.9×10-7.用最小二乘法拟合实验与理论振子强度所得到的三个Ωλ唯像强度参数为:Ω2-0.19×1020cm2;Ω4=1.68×10-20cm2;Ω6=0.62×10... 详细信息

本工作根据Jndd-ofelt理论,利用28个吸收光谱支项,19组方程计算了实验与理论振子强度,均方根偏差仅为1.9×10-7.用最小二乘法拟合实验与理论振子强度所得到的三个Ωλ唯像强度参数为:Ω2-0.19×1020cm2;Ω4=1.68×10-20cm2;Ω6=0.62×10-2cm2.然后,计算了自发辐射电偶和磁偶跃迁几率,辐射寿命,荧光分支比与各激发态的辐射电偶和磁偶振子强度.并示出了0.3～0.2μm波段内的荧光光谱.

关键词：晶体 YAG 光谱支项 judd-ofelt Er 理论计算光谱参数

用judd-ofelt理论计算TmP5O14晶体中Tm3+的光谱参数

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发光学报 1984年第1期 19-28页

作者：苏锵,王庆元,武士学,洪广言,越淑英中国科学院长春应用化学研究所中国科学院长春应用化学研究所中国科学院长春应用化学研究所中国科学院长春应用化学研究所中国科学院长春应用化学研究所

根据judd-ofelt理论,测得了Tm3+在TmP5O14晶体中的强度参数分别为Q2=:1.50×10-20cm2,Q4=1.51×10-20cm2,Q6=0.916×10-20cm2,计算的振子强度Pcal.与实验值Pexp.符合较好,平均根方误差为2.60×10-7。求得Qλ后,计算了J多重激发态之间的振子强度,自发辐射跃迁速率,辐射寿命和荧光分支出,与YAlO3:Tm3+,YAG:Tm3+、Y2O3:Tm3+等晶体和掺Tm3+玻璃的光谱参数进行了比较,并就3H4→3H6,3F4→3H5,1D2→3H4和1G4→3H4的跃迁进行了对比和讨论。观察到Tm3+在不同介质中的Pexp.与强度参数的总和∑τλ=τ2+τ4+τ6存在Pexp.=α∑τλ+b的关系。

关键词：跃迁速率强度参数 judd-ofelt TmP5O 晶体积分发射截面理论计算光谱参数

Er^(3+)掺杂0.91Pb(Zn_(1/3)Nb_(2/3))O_(3)-0.09PbTiO_(3)弛豫铁电晶体judd-ofelt理论分析与光谱参数计算

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西安工业大学学报 2021年第6期41卷 621-627页

作者：张锦惠增哲王信哲韩阿敏西安工业大学材料与化工学院西安710021 西安工业大学陕西省光电功能材料与器件重点实验室西安710021

为了探究稀土离子Er^(3+)在弛豫铁电晶体0.91Pb(Zn_(1/3)Nb_(2/3))O_(3)-0.09PbTiO_(3)中的光谱特性,采用高温溶液法生长了Er^(3+)掺杂0.91Pb(Zn_(1/3)Nb_(2/3))O_(3)-0.09PbTiO_(3)弛豫铁电单晶。测试了样品晶体的紫外-可见-近红外吸收光谱,利用judd-ofelt理论计算了吸收光谱中Er^(3+)的7个特征吸收峰的理论振子强度与实验振子强度以及振子强度参数Ω_(t)(t=2,4,6)。分析了Er^(3+)在0.91Pb(Zn_(1/3)Nb_(2/3))O_(3)-0.09PbTiO_(3)弛豫铁电晶体场中的自发辐射跃迁几率A与荧光分支比β,以及理论能级寿命τ。通过计算获得的振子强度参数为:Ω_(2)=1.18×10^(-20) cm^(2),Ω_(4)=0.55×10^(-20) cm^(2),Ω_(6)=0.42×10^(-20) cm^(2),^(4)I_(13/2)与^(4)I_(11/2)的理论能级寿命分别为4.367 ms与3.903 ms。研究结果表明:0.91Pb(Zn_(1/3)Nb_(2/3))O_(3)-0.09PbTiO_(3):Er^(3+)是一种性能优异的发光晶体,结合该晶体原有的电学特性,它有望成为集电-机-光为一体的新型多功能晶体。

关键词： judd-ofelt PZN-PT Er^(3+) 弛豫铁电晶体

Effect of radiative loss mechanisms on FIR thermometric parameters of Nd^(3+)-doped lithium tellurite glasses

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Journal of Rare Earths 2024年第7期42卷 1250-1257,I0002页

作者： C.Y.Morassuti A.P.L Silva L.A.O.Nunes S.M.Lima L.H.C.Andrade Optical and Photothermal Spectroscopy Group(GEOF) Center for Studies in Natural Resources(CERNA)State University of Mato Grosso do Sul(UEMS)C.P.351DouradosMSBrazil Renato Archer Information Technology Center Dom Pedro I Highway(SP-65)Km 1436-Chácaras Campos dos AmaraisCampinasSPBrazil Institute of Physics of São Carlos University of São PauloSão CarlosSPBrazil

Nd^(3+)-doped tellurite glasses are promising materials for thermometers based on the fluorescence intensity ratio(FIR)***,at high Nd^(3+)concentrations,energy transfer(ET)processes such as optical reabsorption and cross-relaxation can affect the Nd^(3+)emission,which has been little explored in the ***,the present work investigated the use of Nd^(3+)-doped tellurite glass(samples doped with Nd^(3+)at 0.2 mol%,0.5 mol%,2.0 mol%,and 4.0 mol%)in fluorescence thermometers,in the temperature range from 299 to 371 *** results indicate a strong dependence of the FIR parameters on the Nd^(3+)concentration,due to changes in the emission band profiles caused by optical reabsorption of the Nd^(3+)emissions and cross-relaxation processes.A decrease of the relative sensitivity of the ratio^(4)F_(5/2)→^(4)I_(9/2)/^(4)F_(3/2)→^(4)I_(9/2)is observed for samples doped with higher amounts of Nd^(3+).The maximum relative sensitivity at 299 K is 3.00%/K,which is the highest value among the reported Nd^(3+)ions.

关键词： Nd^(3+)-doped tellurite glass Fluorescence intensity ratio Optical thermometry judd-ofelt Rare earths

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Rapid visualization of latent fingerprints using novel CaSiO_3:Sm^(3+) nanophosphors fabricated via ultrasound route

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Journal of Rare Earths 2019年第1期37卷 32-44,M0003页

作者： R.B.Basavaraj G.P.Darshan B.Daruka Prasad S.C.Sharma H.Nagabhushana Prof.C.N.R.Rao Centre for Advanced Materials Tumkur University Department of Physics Acharya Institute of Graduate Studies Department of Physics B M S Institute of Technology and ManagementVTU Affiliated Department of Mechanical Engineering Jain UniversityAdvisor Jain Group of Institutions

Latent fingerprints (LFPs) were the most significant identification method for individualization. Most commonly available fingerprints (FPs) in crime spot investigation were latent and patent types. Generally,LFPs were invisible and thus the effective visualization technique necessitates for the analysis of such FPs. In the past years, many traditional visualization techniques have been employed, but suffered with low resolution, sensitivity, contrast and high background noise. To overcome such limitations, we synthesized Sm^(3+) doped CaSiO_3 nanophosphors (NPs) via an ultrasound irradiation route using mimosa pudica (m. p.)leaves extract as a bio-surfactant. The morphological behavior of the prepared samples was extensively studied by varying the concentration of the m. p. extract, ultrasound irradiation duration, pH level of the precursor solution and sonication power. The photoluminescence (PL) emission spectra exhibit characteristic peaks at～561,601 and 647 nm, which were attributed to^5G_(5/2)→~6H_J(J=5/2,7/2 and 9/2) transitions of Sm^(3+) *** judd-ofelt(J-O) intensity parameters and other radiative properties were estimated using PL data. The Commission International de I'Eclairage (CIE) color coordinates were positioned in orange-red region shows average correlated color temperature (CCT) value of～3576 K. The optimized samples can be used as a labeling agent for the visualization of LFPs on various porous and non-porous surfaces under normal light irradiation. The visualized FPs reveals well defined ridge characteristics, namely whorl, loop,arch, bifurcation, eye, island, bridge, sweat pores, etc, with high sensitivity, selectivity, low contrast and background hindrance. Aforementioned results evidence that the prepared CaSiO_3:Sm^(3+) NPs were promising luminescent materials for solid state lighting and forensic applications.

关键词： Ultrasonication,synthesis Photoluminescence Fingerprint Photometric properties judd-ofelt analysis Rare earths

Synthesis,structure and radiative and nonradiative properties of a new Dy3+ complex with sulfonylamidophosphate ligand

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Journal of Rare Earths 2019年第11期37卷 1255-1260页

作者： Lukasz Marek Marcin Sobczyk Victor A.Trush Kamil Korzeniowski Vladimir M.Amirkhanov Janina Legendziewicz Faculty of Chemistry University of WroctawuL E Joliot-Curie 1450-383 WrociawPoland Department of Chemistry Kyiv National Taras Shevchenko UniversityVolodymyrska Street 64Kyiv 01601Ukraine

In recent years there has been growing interest in lanthanide-based multifunctional materials that exhibit interesting photophysical *** work presents spectroscopic and crystallographic characterization of a new dysprosium complex with sulfonylamidophosphate *** crystal structure of[NaDy(SP)4]2·i-PrOH was determined and *** turns out that the Dy(Ⅲ)complex is not isostructural with earlier reported compounds and crystallizes in the monoclinic system(space group P21).Two crystallographically independent dysprosium atoms are in eight-fold coordination,with a triangular dodecahedron ***,emission(77 and 300 K)and excitation spectra as well as fluorescence decay time measurements allowed optical characterization of obtained *** energy transfer from SP-ligand to Dy^3+ion has been *** judd-ofelt theory was applied to predict fundamental fluorescence properties of Dy^3+ion in the title *** judd-ofelt intensity parameters were used to determine the emission transition probabilities,fluorescence branching ratios and radiative lifetime of the emitting 4F9/2 *** obtained results indicate that the investigated chelate can be a potential candidate for OLEDs emitting yellow light.

关键词： Dy^3+ Sulfonylamidophosphates Crystal structure Absorption and emission spectra judd-ofelt intensity calculations Energy transfer

Optical properties and radiative rates of Nd^(3+) doped zinc-sodium phosphate glasses

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Journal of Rare Earths 2019年第3期37卷 253-259页

作者： A.A.El-Maaref Shimaa Badr Kh.S.Shaaban E.A.Abdel Wahab M.M.ElOkr Physics Department Faculty of Science Al-Azhar University Modern Academy for Engineering & Technology Chemistry Department Faculty of Science Al-Azhar University

Preparation using melt quenching technique and optical characterizations of Nd^(3+) doped Zn-Na phosphate glasses are presented. The structure of the present glasses was studied using X-ray diffraction and FT-IR spectroscopy. UV-vis spectra of the present glasses were analyzed at different concentrations of Nd_2 O_3. The effect of neodymium concentration on the density and energy band gap was investigated. The density of the present glasses slightly increases with the increasing of Nd_2 O_3. A small variation of energy band gap with the increasing of neodymium content is observed as well, while E_g values decrease with the increase of Nd_2 O_3 content. The E_g values lie between 4.36 and 4.69 eV. Based on the measured optical spectra, judd-ofelt theory was used to determine the optical parameters such as line strengths, optical intensity parameters(Ω_t), transition probabilities, and transition lifetimes. Hypersensitive transitions were identified in the absorption spectrum, the greatest line strengths are recorded at the transitions^2 G_(7/2)+ ~4 G_(5/2), ~4 S_(3/2) + ~4 F_(7/2) and ~4 D_(1/2) + ~4 D_(3/2)+ ~4 D_(5/2) + ~2 I_(11/2) with wavelengths of 580, 475 and 355 nm,respectively. Lifetimes of the important ~4 F_(3/2) laser-level were determined; which show decreasing trend with the increasing of Nd_2 O_3 content and are found to be between 0.838 and 1.595 ms. The uncertainty of the present results was estimated. The RMS deviations were determined, which show lower values than those in the literature.

关键词： Phosphate glass UV-vis spectroscopy judd-ofelt Radiative rates Rear earth ions

Relaxation dynamics of excited states of Tm3+ ions in TeO2-ZnO-Na2O-Y2O3 glasses

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Journal of Rare Earths 2019年第11期37卷 1188-1195页

作者： Lukasz Marek Marcin Sobczyk Wladyslaw Wrzeszcz Faculty of Chemistry University of Wroclaw

Tellurite glasses with the composition of xTm2O3-(6-x)Y2O3-3Na2O-25ZnO-66TeO2(where 0≤x≤6)were obtained by the melt-quenching ***(300 K),excitation(300 K)and fluorescence spectra(300 K)as well as fluorescence decay curves of Tm^3+-doped title glasses are presented and discussed in *** judd-ofelt analysis based on the room temperature absorption spectrum was applied for determination of fundamental fluorescence properties such as radiative transition probabilities(AT),branching ratios(βR),radiative lifetimes(τR)of the emitting levels of the Tm^3+ion and stimulated emission cross-sections(σem).Fluorescence spectra were recorded and analysed in the visible and near-infrared spectral *** emission and effective cross-section were calculated for the 3F4→3H6 transition,showing that the investigated glasses are promising laser host materials,operating at 1.8μ*** observed concentration quenching and non-exponential decay curves from the 1 G4 and 3H4 states indicate nonradiative energy transfer between Tm^3+*** analysis of non-exponential fluorescence decay curves from the 1 G4 and 3H4 levels was carried out in framework of the InokutiHirayama and Yokota-Tanimoto models and energy transfer microparameters were *** self-quenching model was proposed for describing relaxation of the first excited state of the Tm^3+ion.

关键词： Tm3+ Tellurite glasses judd-ofelt theory Luminescence Laser materials Non-radiative energy transfer