Eu^3＋掺杂铌硅玻璃的微观局域环境特性

研究了Eu^3 掺杂铌硅玻璃的^5Do发射光谱，其激发谱中^7Fo-^5D2声子边带，荧光窄化谱及^5D0能级寿命。并由此计算了强度参数与晶场参数。结果显示^5D0-^7F2／^5D0-^7F1发光强度之比与强度参数Ω2随着Nb2O5浓度的增加而增大．表明材料对称性降低．Eu-O键强增加，共价性增强。晶场参数B20随着Nb2O5的浓度增加而减小，同样表明Eu-O键的距离减小，键强增加。随着Nb2O5的浓度增加。电-声子耦合增强，^5D0能级的无辐射过程加快，寿命变短。     

Eu~(3+)掺杂铌硅玻璃的微观局域环境特性

研究了Eu3+掺杂铌硅玻璃的5D0发射光谱,其激发谱中7F0 5D2声子边带,荧光窄化谱及5D0能级寿命。并由此计算了强度参数与晶场参数。结果显示5D0 7F2 5D0 7F1发光强度之比与强度参数Ω2随着Nb2O5浓度的增加而增大,表明材料对称性降低,Eu-O键强增加,共价性增强。晶场参数B20随着Nb2O5的浓度增加而减小,同样表明Eu-O键的距离减小,键强增加。随着Nb2O5的浓度增加,电 声子耦合增强,5D0能级的无辐射过程加快,寿命变短。     

含Eu3+离子的有机改良硅酸盐材料的合成及光谱性质研究

用溶胶－凝胶低温合成非晶态技术，以正硅酸乙脂与γ－缩水甘油醚基丙基三甲氧基硅烷为先驱体，把Eu^3 离子掺入到上述体系的溶胶与凝胶中，对获得材料的基本物化性能作了研究，同时对获得材料的荧光特性作了详细的研究，研究结果表明掺杂在有机改良硅酸盐凝胶介质中，Eu^3 离子具有较强的发光效应与较宽的发光带，而掺杂在SiO2无机凝胶中的Eu^3 离子表现出很弱的发光强度，讨论了材料的成份，结构与荧光增强效应及增宽效应的内在联系，低温合成的上述复合材料表现出较强的机械强度。     

H3BO3对微波等离子体法合成SrAl2O4:Eu2+,Dy3+的影响

采用微波等离子体法合成SrAl2O4：Eu^2＋ Dy^3＋长余辉发光材料,探讨了H3BO3的加入对材料的光谱性能、余辉性能、相组成结构、微观形貌的影响。结果表明,适量的添加助溶剂H3BO3,有利于增强材料的发光强度,延长余辉时间,但过量的添加反而会导致发光性能下降。本试验确定硼酸的最佳添加量为10％。综合检测分析结果推断,硼酸加入后在高温下大部分形成液相,并通过液相传质促进晶体生长,提高基质的结晶程度,同时促进稀土离子Eu^2＋,Dy^3＋进入晶格并使其分布更均匀;而少部分则会进入晶格发生B取代Al,引起晶体场畸变,从而提高了材料的发光强度和长余辉特性。     

Eu3+掺杂SiO2-Al2O3-B2O3玻璃制备及光谱性能研究

高温溶制了Eu^3＋掺杂SiO2-Al2O3-B2O3-MxOy（M=Li^＋,Na^＋,K^＋,Mg^2＋,Ca^2＋,Sr^2＋,RE^3＋）硼硅酸盐玻璃,测试了玻璃样品的发射光谱、激发光谱和透射光谱,研究了不同碱金属离子、碱土金属离子对该系统荧光性能的影响。利用发射光谱计算了Ω2,Ω4以及^5D0到^7F2,^7F4的自发辐射几率和振子强度f（^5D0→^7F2）,f（^5D0→^7F4）。结果表明,材料的发射能级为^5D0→^7F1（590nm）,^5D0→^7F2（617nm）,^5D0→^7F4（698nm）,而且材料的结构对称性越差,跃迁戒律打破地越彻底,荧光发射越强。     

Ce3+和Tb3+掺杂的稀土硼酸盐玻璃的发光性质

报道Ｃｅ＾３＋和Ｔｂ＾３＋掺杂的硼酸盐玻璃的合成及该系列玻璃的激发和发射光谱性质。在紫外光激发下,玻璃中的Ｃｅ＾３＋发射蓝紫光,Ｔｂ＾３＋发射有特征的绿光,在Ｃｅ＾３＋和Ｔｂ＾３＋共掺杂的体系中,可观察到Ｃｅ＾３＋强烈敏化Ｔｂ＾３＋发光的现象。分析表明,Ｃｅ＾３＋和Ｔｂ＾３＋之间存在辐射能量传递稿铲无辐射能量传递。     

Eu3+/Tb3+和Eu3+/Pr3+共掺杂P(MMA-co-St)的荧光性能的研究

将不同荧光性能的铽(Tb)、镨(Pr)离子分别与铕(Eu)离子混合，以三异丙氧基稀土的形式掺杂P(MMA-CO-St)共聚物，研究Eu^3 ／Tb^3 和Eu^3 ／pr^3 共掺杂P(MMA-CO-St)的荧光性能的变化情况．结果表明，Eu^3 ／Tb^3 掺杂的P(MMA-CO-St)中，Tb^3 作为能量给予体，Eu^3 作为能量接受体，能量转移的结果使Eu^3 特征荧光显增强；Eu^3 ／pr^3 掺杂的P(MMA-CO-St)中，Eu^3 的能量向pr^3 转移，致使Eu^3 的特征荧光猝灭，pr^3 的荧光略为增强．     

溶胶—凝胶法制备掺Eu^3＋的SiO2玻璃的结构及发光性能

利用溶胶－凝胶技术制备了掺不同量Eu^3 和不同退火温度下的SiO2凝胶和玻璃,通过在不同退火温度下样品的激光发谱,发射光谱,红外光谱和差热－热重曲线,研究了掺Eu3 的SiO2玻璃材料的结构和发光性能,结果显示,当Eu3 的掺杂量大于1．86％（质量分数）,Eu^3 的发光强度趋于稳定,当样品的退火温度大于300度时,SiO2凝胶玻璃中吸附的水已基本除净,此时显示出Eu^3 的特征发射光谱,谱带位置分别是614,596,577nm,分别归属于^5Do-7F2,5D0-7F1,^5D0-^7F0跃迁,对应的激光发光谱显示6个峰,位置分别是318,362,380,393,412,462nm,说明300－500度是凝胶向玻璃转变的关键温度,而水对Eu^3 的发光有强烈的淬灭作用。     

Fluorescence of Eu3+-doped InF3-based optical glasses

This paper reports physical, absorption and photoluminescence spectral properties of Eu³⁺-doped indium trifluoride-based optical glasses of the following formulae: 48 InF₃-24 BaF₂-7 AlF₃-20 RF, where RF is the alkali content (LiF, NaF and KF). From fluorescence characteristics of these Eu³⁺-doped glasses, it is found that Glass-A with 20 M% LiF as the network modifier shows a better trend in its optical behaviour. A red emission from these glasses has been noticed upon illumination with the UV lamp. The lifetimes of the lasing transition (⁵D₀→⁷F₂) have been measured both at 300 and 77K with an Ar⁺ laser (487.9 nm) as the source of excitation. Four additional fluorescent levels at 580, 592, 598 and 653 nm have also been measured.     

Luminescent cellulose fibers activated by Eu3+-doped nanoparticles

UV- active cellulose fibers were obtained by dry-wet method spinning an 8?% by weight α-cellulose solution in N-methylomorpholine-N-oxide (NMMO) modified by europium-doped gadolinium oxyfluoride Gd₄O₃F₆:Eu³⁺ containing 5?mol (%) of the dopant. Photoluminescent nanoparticles were introduced in the in powder form into a polymer matrix during the process of cellulose dissolution in NMMO. The dependencies of emission intensity on excitation energy and the concentration of Gd₄O₃F₆:Eu³⁺ nanoparticles in the final cellulosic products were examined by photoluminescence spectroscopy (excitation and emission). The fiber structure was studied by X-ray powder diffraction analysis. The size and dispersity of the nanoparticles in the polymer matrix were evaluated using scanning electron microscopy and X-ray microanalysis. The influence of different concentration particles (in the range from 0.5 to 5?% by weight) on the mechanical properties of the fibers, such as tenacity and elongation at break, were determined.     

(Y,Gd)BO3:Eu的真空紫外光谱特性

近年来由于等离子体平板显示(PDP)技术的需要,对真空紫外(VUV)光激发的荧光粉的研究成为发光材料领域中的一个新方向[1～3]. 由于技术和实验仪器等方面的原因[4], 以往人们对稀土发光材料VUV区的研究很少, 缺乏对其光谱和能级的完整认识. 另外, 稀土离子Gd3+在荧光粉的能量传递中具有特殊作用, 一些含Gd3+的发光材料在VUV区发光效率很高, 例如, (Y,Gd)BO3:Eu在VUV区的发光效率比YBO3:Eu提高了20%, 比Y2O3:Eu提高了1.8倍, 与其它红粉相比更具有实际应用价值[4,5]. 但目前对于(Y,Gd)BO3:Eu的研究主要集中在紫外可见区[6], 因此, 深入研究(Y,Gd)BO3:Eu的真空紫外光谱特性, 对于发展PDP技术具有重要意义.     

Cellulose fibers modified by Eu3+-doped yttria-stabilized zirconia nanoparticles

This paper describes a method for manufacturing luminescent cellulose fibers. Good optical properties of cellulose fibers under UV-C illumination were achieved by incorporating ZrO₂ (0.5?mol% of Eu³⁺) stabilized by Y₂O₃ (7?mol%) into the fiber structure’s particles. Fibers were obtained from 8?wt% cellulose solution in N-methylmorpholine N-oxide (NMMO) with the addition of a luminescent modifier in the range between 0.5 and 10?wt%. The physico-chemical and mechanical parameters and the structure of these fibers were examined.     

Immobilization of folic acid on Eu3+-doped nanoporous silica spheres

Folic acid (FA) was immobilized on Eu(3+)-doped nanoporous silica spheres (Eu:NPSs) through mediation of the 3-aminopropyltriethoxysilane adlayer. The ordered nanopores of Eu:NPS were preserved by the immobilization. The FA-immobilized Eu:NPSs showed the characteristic photoluminescence peak due to interactions between the FA molecules and Eu(3+) ions, and highly dispersed stability in phosphate buffered saline.     

Structural and spectroscopic investigations on Eu3+-doped alkali fluoroborate glasses

Eu³⁺-doped alkali fluoroborate glasses B₂O₃–XCO₃–NaF–Eu₂O₃ (where X = Li₂, Na₂, K₂, and Ca, Mg) have been prepared using the conventional melting technique and their structural and optical properties have been evaluated. The XRD pattern of the glasses confirmed the amorphous nature and the FTIR spectra reveal the presence of BO₃ and BO₄ units as their local structures along with the strong OH^? groups. From the absorption spectra the bonding parameters have been calculated and confirmed that the Eu–O bonds in the studied glasses are of covalent nature. Judd–Ofelt (JO) analysis has been carried out from the emission spectra. The JO parameters have been used to calculate transition probabilities (A), lifetime (τ_R) and branching ratios (β_R) and peak stimulated emission cross-section (σ_P^E) for the ⁵D₀ → ⁷F_J (J = 1, 2, 3 and 4) transitions of the Eu³⁺ ions. The decay from the ⁵D₀ level of Eu³⁺ ions in the title glasses has been measured and analysed. The lifetime of the ⁵D₀ level is found to be shorter than the reported glasses which may be due to the presence of OH^? groups.     

Growth and Spectral Properties of Yb^3＋-doped Ba3Gd（BO3）3 Crystal

Crystal of Yb3+-doped Ba3Gd(BO3)3 has been grown by the Czochralski method. The spectroscopic characterizations have been investigated at room temperature. The Yb3+:Ba3Gd(BO3)3 crystal exhibits broad absorption at 976nm with FWHM of 7nm and large overall spitting of 2F7/2 manifold (823cm-1). The absorption and emission cross sections are 5.09×10-21cm2 at 976nm and 0.97×10-21cm2 at 1040nm,respectively. The fluorescence lifetime is 2.84 ms.     

Thermal study in Eu3+-doped boehmite nanofibers and luminescence properties of the corresponding Eu3+:Al2O3

Eu³⁺-doped boehmite nanofiber materials with different Eu³⁺ concentrations were synthesized without any surfactant, and followed by a series of characterizations. It was found that the boehmite nanofibers became coarser with the increase of Eu³⁺ concentration, which resulted in a gradual decrease of their specific surface areas. Moreover, the thermal stability of the boehmite nanofibers was studied by thermogravimetry–differential scanning calorimetry. All materials showed the phase transition from γ-Al₂O₃ to other forms. Yet the transition temperature was increased with the increase of Eu³⁺ concentration. The Eu³⁺-doped boehmite nanofibers with the maximum Eu³⁺ concentrations showed the best thermal stability. Photoluminescence spectra showed that the 2 mol% of doping concentration of Eu³⁺ ions in Eu³⁺:Al₂O₃ nanofiber was optimum.     

白光LED用荧光材料Ba3 Gd( BO3 )3:Eu3+的发光性能研究

用高温固相反应法制备了稀土离子Eu3+ 掺杂的三元稀土硼酸盐Ba3Gd(BO3)3发光材料, 通过X射线衍射 (XRD) 、荧光光谱和扫描电镜 (SEM) 等测试手段对Ba3Gd(BO3)3:Eu3+ 荧光粉的制备条件、发光性能以及形貌进行了研究. XRD结果表明, 在1000 ℃时可得到Ba3Gd(BO3)3 纯相. 扫描电镜照片显示颗粒基本为球形, 粒径约为200～400 nm. 发光光谱测试表明, Ba3Gd(BO3)3:Eu3+荧光粉在近紫外区(UV) (396 nm)和蓝光区(466 nm)可以被有效地激发, 分别用255和396 nm的紫外光激发样品时, 以Eu3+ 的 5D0-7F2 (611和616 nm) 超灵敏跃迁为主要发射峰. 当Eu3+的掺杂浓度为10%(摩尔分数)时, Ba3Gd(BO3)3:Eu3+ 在611和616 nm处的发光强度最大. 因此, 这种荧光粉是一种可能应用在白光LED上的红色荧光材料.