羟基对掺铒铋酸盐玻璃1.53 μm波段荧光及信号放大特性的影响

用高温熔融法制备了组分为Bi2O3-B2O3-SiO3铋酸盐掺铒玻璃,研究了羟基含量对玻璃中Er3+的1.53 μm波段荧光和对光纤中信号放大特性的影响.研究表明:通过氧气鼓泡除水处理.能有效地去除玻璃中羟基,从而显著提高1.53μm波段荧光强度.同时,对铋酸盐掺铒玻璃光纤中Er3+离子数速率方程和光功率传输方程的理论模拟表明:减少纤芯玻璃中羟基含量可以使1 520～1 620mm范围内信号增益得到不同程度的提高.因此,除水处理对于铋酸盐掺铒玻璃应用于1.53μm波段宽带光纤放大器是非常必要的.     

掺铒钨碲酸盐玻璃光谱性质的研究

研究了掺铒钨碲酸盐玻璃的吸收光谱和荧光光谱。应用JuddOfelt理论计算了Er3+的光谱强度参数Ωt(t=2,4,6)、自发辐射跃迁几率、荧光分支比和辐射寿命。从光谱强度参数的计算说明掺铒钨碲酸盐玻璃中Er—O键的共价性强于碲酸盐玻璃中Er—O键的共价性。玻璃的荧光半高宽为52nm,大于Er3+在磷酸盐和硅酸盐玻璃中的荧光半高宽。应用McCumber理论,计算了钨碲酸盐玻璃中Er3+离子在峰值波长1532nm的受激发射截面,为0.91×10-20cm2,大于Er3+在碲酸盐玻璃中的受激发射截面0.75×10-20cm2。由于掺铒钨碲酸盐玻璃的玻璃转变温度高、有较大的声子能量、较宽的荧光半高宽和较大的受激发射截面,是制作高增益的光波导放大器的理想材料。     

掺铒0.7TeO2-0.2ZnO碲酸盐玻璃的热膨胀性能探讨

研究表明掺铒TeO2-ZnO碲酸盐玻璃具有良好的热力学稳定性和光学性能.本文通过对掺杂不同浓度Er2O3的TeO2-ZnO碲酸盐玻璃的热膨胀性能进行测试,依据玻璃的热机械分析(TMA)测试曲线来分析碲酸盐玻璃的热膨胀性能的影响规律,以期得到一种具有良好热力学稳定性以及热膨胀性能的光纤放大器用碲酸盐玻璃基质.     

二氧化硅对铒/铈共掺碲酸盐玻璃光谱性质的影响(英文)

为进一步提高Er3+1.53μm波段的光谱特性,在Er3+:4 I11/2→4 I13/2和Ce3+:2 F5/2→2 F7/2跃迁间存在能量失配(1 400cm-1附近)的Er3+/Ce3+共掺碲酸盐(TeO2-Bi2O3-TiO2)玻璃中引入了高声子能量SiO2组分。测试分析了不同SiO2组分含量下的Er3+吸收光谱、上转换发光谱、1.53μm波段荧光谱、荧光寿命、放大品质因子和玻璃样品的热性能。结果表明:由于增强的Er3+/Ce3+离子间能量传递,当玻璃样品中SiO2含量达到9%(摩尔分数)时,Er3+的1.53μm波段荧光强度得到显著提高。同时,荧光半高宽随SiO2组分含量相应展宽,而玻璃热稳定性随之提高。     

掺铒碲酸盐玻璃的制备和光谱性能

制备了掺铒碲酸盐玻璃80TeO2-10La2O3-10RmOn(RmOn=BaO,Na2O,Li2O),用差热分析方法研究了碲酸盐玻璃的热力学稳定性。应用MeCumber理论计算了Er3 在碲酸盐玻璃中的受激发射截面σemi=9.51×10-21 cm2。利用所测玻璃的吸收光谱,应用Jadd-Ofelt理论计算出碲酸盐玻璃的J-O强度参数,Er3 在玻璃中的自发辐射机率,荧光分支比及跃迁振子强度等光谱参数。从玻璃的荧光光镨测得掺Er3 碲酸盐玻璃的荧光半高峰为75 nm。作为光放大器介质的掺Er3 碲酸盐玻璃的荧光峰半高宽与受激发射截面积值分别为铝硅酸盐玻璃的2.8倍和4.3倍,是一种更为理想的宽带光纤放大器用基质材料。     

高价氧化物对掺铒碲酸盐玻璃光谱性质的影响

对比分析了相同铒离子低掺杂浓度下,Y2O3、GeO2、Nb2O5 WO3四种高价氧化物对碲锌玻璃系统光谱性质的影响.测试了四个样品的红外透过光谱,结果表明由于Nb2O5 、WO3二者引入的高价阳离子的极化作用使得二者部分的充当玻璃形成体的角色,使得玻璃的有效红外透过范围降低.同时吸收光谱也表明这两种高价氧化物会使得玻璃紫外吸收边发生明显红移.铒离子的近红外荧光光谱结果表明,引入高价氧化物会由于高价阳离子的极化作用导致铒离子的荧光半高宽增加,特别以含WO3的TZW样品具有最高的荧光半高宽达64nm.     

铋碲酸盐玻璃中钐离子的光学和光谱特性

制备了高折射率钐离子掺杂铋碲酸盐玻璃,测量并利用Brewster定律计算的玻璃折射率nd=2.344。测试与分析了玻璃的吸收和荧光光谱,根据Judd Ofelt理论对吸收光谱进行了拟合,求得Sm3+的光谱参量Ωt(t=2,4,6)分别为4.73×10~(-20),2.78×10~(-20),1.77×10~(-20)cm2,并进一步计算了Sm3+在玻璃中各能级跃迁的振子强度、自发辐射跃迁几率、辐射寿命和荧光分支比等光谱参数。激发光谱表明:氩离子激光器和紫外、蓝色激光二极管及发光二极管是Sm~(3+)掺杂铋碲酸盐玻璃有效的泵浦光源。     

铋掺杂锗酸盐玻璃超宽带近红外发光性质及机理

采用传统的高温熔融法制备了80GeO2–20RO (R=Ca, Sr, Ba)掺铋锗酸盐玻璃。研究了铋掺杂锗酸盐玻璃超宽带近红外发光性质,探讨了铋离子掺杂玻璃超宽带发光机理。结果表明：在808 nm激光激发下,铋掺杂锗酸盐玻璃随着碱土金属离子半径增加,中心波长为1300 nm的发射强度逐渐降低;在690 nm激光激发下,铋掺杂锗酸盐玻璃的近红外发射覆盖从900 nm到2000 nm波段但不呈现正态分布,荧光半高宽达428 nm。随着碱土金属离子半径的增加,其近红外发射中心位置逐渐向长波方向移动,推测近红外发光可能源于两种不同形式铋的发光中心。铋掺杂的锗酸盐玻璃具有良好的光学性能,较宽的荧光半高宽,将成为未来超宽带光纤放大器的增益介质。     

Tm3+离子浓度对碲酸盐玻璃热稳定性及光谱性能的影响

用高温熔融冷淬法制备Tm3+离子掺杂75TeO2-20ZnO-5La2O3碲酸盐玻璃,运用差示扫描量热仪(DSC)分析了玻璃样品的热稳定性,结果表明样品均具有良好的热稳定性.根据紫外-可见-近红外分光光度计测量得到的玻璃吸收光谱,运用Judd-Ofelt理论,计算了Tm3+离子在碲酸盐玻璃中的Judd-Ofelt强度参数、自发辐射概率A、荧光分支比β和辐射寿命ΤR等光谱参数.当掺杂浓度为0.8mol％时,玻璃热稳定性好,3H4的荧光寿命最长,为0.285ms,有望成为一种理想的S波段宽带光纤放大器用基质材料.     

光学碱度与铋离子掺杂锗酸盐玻璃近红外发光性质之间的关系

制备了铋离子掺杂的碱金属和碱土金属锗酸盐玻璃,并研究了玻璃光学碱度与铋离子近红外发光性质之间的关系。结果表明:铋离子的宽带近红外发光的强度、峰位以及荧光半高宽可以通过锗酸盐玻璃的光学碱度进行调控:随着玻璃光学碱度的增加,红外发光强度下降,半高宽增大,同时发光峰红移;玻璃中Bi~(3+)/Bi~(2+)的摩尔比变化趋势与Duffy光学碱度理论相符。而铋离子近红外发光强度与光学碱度的依存关系表明,近红外宽带发光可能源于低价态铋离子。     

稀土Eu光转换材料的合成

以聚二甲基硅氧烷（PDMS）为配体,以三苯基氧膦（TPPO）为协同配体,合成稀土铕高分子透明薄膜。用荧光、红外光谱对薄膜进行表征。结果表明薄膜具有良好的荧光性质,并且发现Eu^3＋直接键合到PDMS链中的氧原子上。荧光光谱表明配合物同时具有PDMS和Eu^3＋的特征发射。     

二苯乙烯基双苯并(口恶)唑类化合物的合成及光谱性能的研究

以对氰基氯苄为原料与取代的邻氨基苯酚反应,合成了标题化合物。测定了此类化合物的紫外光谱和荧光光谱,并以硫酸喹宁为参比标准测定了化合物的荧光量子产率。研究了分子结构与紫外光谱、荧光光谱的关系。     

The synthesis of bi- and trichromophoric dyes bearing an s-triazinyl ring spacer

An alternative procedure has been described for the syntheses of several bi- and trichromophoric compounds consisting of 1-aminopyrene and 3-aminobenzanthrone chromophoric subsystems connected by an s-triazinyl ring spacer. The synthetic method used, which utilises an autoclave under autogenous pressure, is suitable for the nucleophilic substitution of both chlorine atoms within the triazinyl ring by weakly basic aromatic amines. The structures of the synthesized compounds were confirmed using elemental analysis, ¹H NMR, and mass spectra. UV/vis absorption and fluorescence spectra and fluorescence quantum yields were measured. The dependence of fluorescence intensity and fluorescence quantum yields on solvent polarity was investigated.     

Y型均三嗪衍生物的合成及其光学性质

合成了含有不同支链的三支结构的三嗪衍生物。测定了它们的线性吸收和发射性质以及双光子吸收和发射性质。发现D3b对称的八极分子与其结构相似的分子相比，有荷更好的单光子和双光子吸收以及发射性能。     

The preparation of copolymerized fluorescent microspheres of styrene using detergent-free emulsion polymerization

The polymerisable fluorescent monomer, 4-ethoxyl-N-allyl-1,8-naphthalimide, was synthesized from 4-bromo-1,8-naphthalic anhydride and characterized using FT-IR spectra, ¹H NMR and fluorescence spectra. A copolymer of styrene and 4-ethoxyl-N-allyl-1,8-naphthalimide was prepared by detergent-free emulsion polymerization and characterized using fluorescence spectra, SEM and fluorescence microscopy. The fluorescence spectrum of the copolymer displayed excitation at 365 nm and emission at 435 nm in acetone. SEM revealed that the copolymers were microspheres, with smooth surfaces and displayed intense blue fluorescence.     

Analysis of a coal-derived liquid using highpressure liquid chromatography and synchronous fluorescence spectrometry

Synchronous fluorescence spectra of model polycondensed aromatic hydrocarbon molecules were recorded and used to identify the number of condensed rings in the aromatic molecules. A coal-derived liquid from Yubarishinko coal was initially separated into fractions having different number of condensed aromatic rings, and each fraction was further divided into narrow fractions having different numbers of carbon atoms. These fractions were studied using synchronous fluorescence spectroscopy. Results indicate the potential usefulness of synchronous fluorescence spectroscopy as a method of analysis of complex mixtures as coal-derived liquids despite the limitation of the method that some molecules give only weak peaks. Several components in some fractions were identified by a combination of synchronous fluorescence spectra and conventional excitation and emission fluorescence spectra.     

罗丹明B的三维荧光光谱研究

本文利用三维荧光激发-发射光谱研究了罗丹明B的荧光光谱特性。考察了罗丹明B浓度、pH值大小等因素对罗丹明B的荧光光谱影响，给出了其三维荧光光谱图。结果显示，罗丹明B的三维荧光光谱图较二维荧光光谱图能更详细地描述被测组分的性质，为综合考查罗丹明B的结构特征提供了参考。     

共沉淀法制备纳米级Y2O3：Eu^3＋红色发光粉体及

以Y2O3,Eu2O3为原料采用尿素共沉淀法,在600、800和1000℃温度煅烧制备了Y2O3：Eu^3＋纳米级粉体,利用XRD、SEM等测试手段对粉体的形貌进行了表征,用分光光度计溯试了样品的激发和发射光谱。并比较了这兰个温度下样品的发光性质,结果表明1000℃煅烧的粉体发光性能最好。     

The Temperature Dependence of Fluorescence of Dibenzoanthrones

The fluorescence spectra of three isomeric dibenzoanthrones, 13H-dibenzo[a, de]anthracen-13-one (1), 13H-benzo[hi]chrysen-13-one (2), and 7H-dibenzo[a, kl]anthracen-7-one (3), in an ethanol-ethertoluene mixed solution were measured as a function of the sample temperature (T). The three molecules provided individual T-dependences of fluorescence spectra. The spectra of 1 changed usually; as T was decreased, they were intensified, showing a vibrational structure more clearly. 2 fluoresced very weakly and the spectra were almost insensitive to T; it also phosphoresced at low temperatures. The spectra of 3 exhibited only a broad band and, strangely enough, it was reduced with decreasing T. The peculiar T-dependence of the fluorescence spectra of 2 and 3 was explained in terms of the results obtained by molecular orbital calculations.     

Fluorescent hybridization probes for sensitive and selective DNA and RNA detection

We outline the different approaches taken by our group in the design of fluorescent hybridization sensors. Molecular beacons (MBs) and binary probes (BPs) using two dyes (2d-MB and 2d-BP, respectively) have been synthesized; these sensors serve as switches in emission upon binding to target biomolecules, such as DNA. These sensors allow for ratiometric fluorescence detection of polynucleotides (PNs) by visualization of the probes when bound to a target PN. Additionally, three-dye MBs (3d-MB) and BPs (3d-BP) have been developed, where an energy-transfer cascade is employed to decrease the overlap between the fluorophore emission spectra, resulting in a low direct excitation of the acceptor fluorophore. Pyrene-based MB (Py-MB) and BP (Py-BP), which possess the advantage of long fluorescence lifetimes, have also been synthesized. Time-resolved fluorescence spectra (TRES) can be used to discriminate between short-lived background fluorescence and long-lived fluorescence of the pyrene probes. This technique was demonstrated by time-resolving the signal of a Py-BP from the background fluorescence in Aplysia californica cell extracts.