用溶胶－凝胶法研究Ormosils中C_（60）掺杂及其Raman光谱和荧光光谱

利用溶胶－凝胶方法，研究了Ｃ６０在ＫＨ—５６０基Ｏｒｍｏｓｉｌｓ（ＯｒｇａｎｉｃＭｏｄｉｆｉｅｄＳｉｌｉｃａｔｅｓ）中的掺杂过程．采用紫外激发的室温荧光光谱和Ｒａｍａｎ光进分析研究Ｃ６０在有机改性硅酸盐材料中的结构状况．可能因为Ｃ６０受到环境的影响，两个Ｒａｍａｎ峰２７０和１４５９ｃｍ－１分裂成另外一些峰．与基质作品相比，Ｃ６０掺杂样品在２１９ｎｍ紫外波长激发的荧光光谱明显不同，发现有６２０，６７０，６８２，７１５，７３４和７６６ｎｍ六个发光峰．其中６８２，７１５和７３４ｎｍ的三个发光峰与低温态（５Ｋ，２０Ｋ）文献值相近．     

PbO—Bi2O3—B2O3—SiO2l系重金属氧化物玻璃的结构与光学性能

通过密度，可见光光谱，红外吸收光谱，Ｃｏ－６０辐照损伤试验及荧光光谱的测试，研究了ＰｂＯ－Ｂｉ２Ｏ３－Ｂ２Ｏ３－ＳｉＯ２玻璃系的光学性能与结构。密度最高可达８．４６４ｇ／ｃｍ＾３，其紫外吸收边截止波长随Ｐｂ＾２＋及Ｂｉ＾３＋含量升高而红移。     

PbO－Bi_2O_3－B_2O_3－SiO_2系重金属氧化物玻璃的结构与光学性

通过密度、可见光光谱、红外吸收光谱、Ｃｏ－６０辐照损伤试验及荧光光谱的测试，研究了ＰｂＯ－Ｂｉ２Ｏ３－Ｂ２Ｏ３－ＳｉＯ２玻璃系的光学性能与结构．密度最高可达８．４６４ｇ／ｃｍ３其紫外吸收达截止波长随Ｐｂ２＋及Ｂｉ３＋含量升高而红移．玻璃熔化温度低达８５０℃．在ＰｂＯ－Ｂｉ２Ｏ３－Ｂ２Ｏ３系玻璃中加人ＳｉＯ２可使玻璃结构更致密．室温下该系统玻璃在３６０ｎｍ有一个宽的激发峰，能产生４１８ｕｍ及４３８ｕｍ两个弱的发射峰．该系统玻璃的结构是由［ＳｉＯ４］４－、［ＢＯ３］３－、［ＢＯ４］５－、［ＰｂＯ４］６－及［ＢｉＯ６］９－构成．其中部分Ｐｂ２＋及Ｂｉ３＋以网络外体进入玻璃．     

一种潜在的激光制冷介质-罗丹明B掺杂PMMA

报道了罗丹明B掺杂PMMA材料制作过程及材料吸收和荧光光谱实验。吸收光谱表明，PMMA样品从紫外到近红外范围存在较小的吸收。罗丹明B／PMMA样品吸收光谱主要反映罗丹明B的吸收特征，其吸收峰中心波长位于550nm。荧光光谱显示，以630nm激发，反斯托克斯荧光峰位于595nm，能量差为0．11eV。该材料辐射反斯托克斯荧光，可用于激光制冷领域的研究。     

Nd:Gd_xY_(1-x)Ca_4O(BO_3)_3晶体的生长及其光谱性能研究

利用熔体提拉法生长了大尺寸,高质量的新型激光自信频晶体Ｎｄ：ＧｄｘＹ１－ｘＣａ４Ｏ（ＢＯ３）３简称Ｎｄ：ＧｄＹＣＯＢ）．对Ｎｄ：ＧｄＹＣＯＢ晶体的ＸＲＤ衍射图进行指标化,得到它的晶胞参数为α＝８．０８０Ａ; ｂ＝１６．０１６Ａ; ｃ＝３．５３８Ａ; β＝１０１．１８°;μ＝４９１．１Ａ３．对取自不同部位的晶体粉末进行ＩＣＰ原子发射光谱分析表明晶体整体组份均匀一致,根据熔体和晶体粉末的ＩＣＰ数据计算,Ｎｄ：ＧｄＹＣＯＢ晶体中Ｎｄ３＋的分凝系数为０．６３．首次报道了 Ｎｄ：ＧｄＹＣＯＢ晶体２００～３０００ｎｍ室温透过光谱和室温荧光光谱及荧光寿命．室温透过光谱表明Ｎｄ：ＧｄＹＣＯＢ晶体的紫外吸收边在～２２０ｎｍ,具有很宽的透光波段（～２２０～２７００ｎｍ）; Ｎｄ：ＧｄＹＣＯＢ晶体在８００ｎｍ附近存在很强的吸收,适合于ＬＤ泵浦．荧光光谱表明Ｎｄ：ＧｄＹＣＯＢ晶体是一种很有潜力的ＲＧＢ（ｒｅｄ;ｇｒｅｅｎ, ｂｌｕｅ）激光自信频晶体．掺杂 ４％、 ５％ Ｎｄ：ＧｄＹＣＯＢ晶体的荧光寿命分别为 １０５μｓ和１００μｓ．     

Sb2O3掺杂对YBa2Cu3O7—δ超导性质的影响

研究了Ｓｂ２Ｏ３掺杂的多晶ＹＢａ２Ｃｕ３Ｏ７－δ超导体的超导转变温度和输运临界电流密度Ｊｃ（Ｂ）在磁场中的行为。测量了超导性能对该掺杂浓度的依赖关系。适当浓度的掺杂可使Ｊｃ至少提高一个数量级，对掺杂样品进行了扫描电镜微结构观测和Ｘ射线结构分析。     

近紫外光激发的新型蓝色荧光粉SrZnO2：Bi^3＋的合成与发光性能

采用柠檬酸溶胶．凝胶法合成了SrZnO2：Bi^3＋和SrZnO2：Bi^3＋，M^＋（M=Li，Na，K）新型蓝色荧光粉。通过X射线粉末衍射、紫外-可见吸收光谱以及荧光光谱对样品进行了表征。结果表明，其激发谱是由位于250、365nm处的两个宽峰组成，该样品能有效吸收近紫外光。在不同波长的紫外光激发下，样品都发出较强的蓝色荧光，发射谱的峰形和峰位基本相同，最大峰位在455nm附近。SrZnO2基质中Bi^3＋的最佳掺杂浓度较低，仅为1．40％。共掺杂碱金属离子既能增强SrZnO2：Bi^3＋荧光体的激发和发射强度，也可以导致激发峰的劈裂。其中以共掺Li^＋离子的效果最好,SrZnO2：Bi^3＋，Li^＋能有效地吸收365-400nm的近紫外光，发射出较强的蓝光，是一种新型白光发光二极管用蓝色荧光粉。     

用于微片激光器的Nd~(3 )掺杂四磷酸盐玻璃光谱研究

制备了Ｎd３＋掺杂四磷酸盐玻璃,测量了吸收光谱、荧光光谱,计算Ｎｄ３＋的发射截面,研究了其荧光特性、浓度猝灭及其机制、以及ＯＨ基对荧光强度和能量传递的影响,研究发现在四磷酸盐玻璃 Ｎｄ３＋的最佳浓度约为 ４．１×１０２０ ｉｏｎｓ／ｃｍ３,在研究光谱性质的基础上实现了Ｎｄ３＋掺杂四磷酸盐玻璃微片激光器１．０５４μｍ的连续激光输出．     

GaN的MOVPE生长和m－i－n型蓝光LED的试制

利用自行研制的常压ＭＯＶＰＥ设备和全部国产ＭＯ源，采用低温生长缓冲层技术，在蓝宝石（α－Ａｌ２Ｏ３）衬底上获得了高质量的ＧａＮ外延层。未掺杂的ＧａＮ外延层的室温电子迁移率已达１１４ｃｍ２／Ｖ．ｓ，载流于浓度为２×１０１８。７７Ｋ光致发光谱近带边发射峰波长为３６５ｎｍ，其线宽为４ＤｍｅＶ。Ｘ射线双晶衍射回摆曲线的线宽为３６０ａｒｃｓｅｃ。用Ｚｎ掺杂生长了绝缘的ｉ－ＧａＮ层。在此基础上研制了ｍ－ｉ－ｎ型ＧａＮ的ＬＥＤ，并在室温正向偏压下发出波长为４５５ｎｍ的蓝光。     

电化学合成聚噻吩结构的光谱和电子能谱表征

借助紫外-可见-近红外光谱,红外光谱,喇曼光谱等实验技术研究了电化学合成导电高分子聚噻吩(Polythiophene)材料在掺杂和非掺杂情况下的结构特征,说明了双极化子是这一类基态非简并的高分子的主要元激发。喇曼光谱和俄歇电子能谱还表征了掺杂离子在样品中的分布,掺杂离子处于高分子链的间隙中,且在深度分布上是均匀的。     

掺杂C60的SiO2-PDMS有机-无机复合材料的光学性质

用溶胶-凝胶法制备了含有C60的二氧化硅-聚二甲基硅氧烷复合凝胶材料,研究了材料的制备机理及结构性质,及其在低温条件下的变温发光光谱,给出了发光强度与温度的变化关系曲线.拟合实验数据得到了C60/SiO2-PDMS热激活能为450cm-1.     

The raman spectra and X-ray powder diffraction data of stabilized hafnia phases

Raman spectra and X-ray powder diffraction data were measured for various compositions of Y₂O₃-doped hafnia, and interpreted on the basis of the growth of a stabilized hafnia phase apparently possessing tetragonal distortion with increasing dopant concentration. In contrast to the results for pure zirconia, there was no evidence in the Raman spectra or powder X-ray diffraction patterns to indicate the formation of a small particle size-stabilized tetragonal hafnia phase when X-ray amorphous hafnium hydroxide was heated at 425–600°C.     

真空还原制备的VO2热致相变薄膜Raman光谱和红外光谱研究

报道了利用真空还原制备的VO2薄膜的红外透射光谱和Raman光谱，并进行370－900nm波段的光透射测试以及900nm波长的热滞回线特性测试，表明所制备VO2薄膜具有优良的热致相变光学特性，结晶状态不同的薄膜其Raman谱位置有明显改变，室温时的红外光谱表现出较好的红外振动特性。讨论了薄膜结晶状态对Raman位移的影响以及VO2薄膜的红外光谱。     

SiOx-doped DLC films: Charge transport, dielectric properties and structure

In the present study, SiO_x-doped diamond-like carbon (DLC) films were synthesized by ion beam deposition on different substrates. Electrical properties, morphology and structure of the DLC films were investigated. Poole-Frenkel emission was the main carrier transport mechanism in all investigated metal-SiO_x-doped DLC-metal samples. Dielectric properties of the samples were dependent on both the bottom and top electrode metal. The trans-polyacetylene chain vibrations detected from the Raman spectra have been observed for all the SiO_x-doped DLC films. Different dielectric properties of the film deposited onto the different metal interlayers were explained both by different roughness of the metal films and by different structure of the ion beam-synthesized SiO_x-doped DLC films.     

C60分子Raman活性振动模态的计算分析

分子的振动特征是标定微观物质结构的重要手段，Raman光谱可以准确地测定分子振动的具有极化率的特征频率，而相应的振动模态则需要采用理论分析或计算来得到，群论方法是计算分子振动特征的主要方法，但它的分析过程非常复杂，在应用中具有较大的难度。本文在分子力学原理的基础上，针对碳一碳共价键给出相应的能量描述关系，建立了完整的碳-碳键合单元，并应用于C60分子的振动分析和计算，给出了C60分子Raman活性振动模态的计算结果，与相应的实验结果进行了比较，验证了本文所提出建模方法的正确性和实用性，基于实验数据还得到碳纳米材料中的碳-碳共价键的力常数，为分析具有共价键的纳米分子的振动性能提供一种简洁、高效的计算分析方法。     

Raman spectroscopy of fullerenes and fullerene-nanotube composites

The discovery of fullerenes in 1985 opened a completely new field of materials research. Together with the single-wall carbon nanotubes (SWCNTs) discovered later, these curved carbon networks are a playground for pure as well as applied science. We present a review of Raman spectroscopy of fullerenes, SWCNTs and composite materials. Beginning with pristine C(60), we discuss intercalated C(60) compounds and polymerized C(60), as well as higher and endohedral fullerenes. Concerning SWCNTs, we show how the diameter distribution can be obtained from the Raman spectra and how doping modifies the spectra. Finally, the Raman response of C(60) encapsulated into SWCNTs (C(60) peapods) is discussed.     

一种获得高分辨可见光吸收谱的新方法

本文介绍了如何在拉曼探针上获得稀土样品的高分辨可见分光吸收谱的方法。这种方法与拉曼探针的综合作用可在同一台仪器上获得稀土样品的拉曼光谱，发光谱和吸收说。本文还讨论了一些应用实例。     

Sol-Gel法制备有机改性硅酸盐及其掺杂复合光学材料研究进展

本文介绍了sol- gel法制备有机改性硅酸盐及其掺杂光学材料 ,系统评论了有机改性硅酸盐及其掺杂光学材料近年来的研究进展 ,并对将来的研究方向进行了预测。     

Low-temperature Al-induced crystallization of hydrogenated amorphous Si1−xGex (0.2 ≤ x ≤ 1) thin films

Low-temperature Al-induced crystallization of hydrogenated amorphous silicon-germanium thin films has been investigated by X-ray diffraction, Raman spectra and scanning electron microscopy measurements. It was shown that the Al-induced layer exchange significantly promotes the crystallization of the films. The influence of the annealing temperature and the Ge fraction on X-ray diffraction patterns and Raman spectra was analyzed. The increase in Raman peak intensity was observed with the increase of the annealing temperature, and the high-frequency shifts of Ge-Ge and Si-Ge peaks were found with the increase of the Ge fraction. There is an enhancement in film crystallinity and grain size with the increase of the Ge fraction and annealing temperature.     

The influence of composition on optical properties of ferroelectric potassium lithium niobate single crystals

Homogeneous crack-free Potassium Lithium Niobate (KLN) single crystals with different Li content were grown up by the TSSG technique. Lattice vibration spectra of these samples were investigated using Raman spectroscopy. The results showed that characteristic Raman spectra of the [NbO₆]⁷⁻ octahedral ions were strikingly influenced by the Li ions. Thus, the symmetric bend vibration mode ν₅ of the KLN sample with higher Li content was split into three Raman peaks, while the sample with lower Li content displayed a single peak, supporting that the bend vibration modes of the [NbO₆]⁷⁻ octahedrons were obviously perturbed by Li ions occupying C-sites. Enhanced Raman peak intensities of the KLN sample post-annealed at 900 °C for 24 h evidenced that content of defects in KLN crystal might be reduced. The transmittance spectra showed that the crystal with higher Li content had better transmittance intensity.