氟化铟基玻璃中Er^3＋离子光谱性质的研究

测定了掺Ｅｒ＾３＋氟化铟基玻璃的吸收光谱，激发光谱和荧光光谱，计算了该玻璃的强度参数Ω（ｔ＝２，４，６），给出了Ｅｒ＾３＋离子的发光特性的计算结果，并与掺Ｅｒ＾３＋的氟锆酸盐玻璃做比较，解释了基质玻璃对Ｅｒ＾３＋离子发光特性的影响。     

掺稀土离子的CaS：Bi荧光粉的发光性质

采用固相反应法合成了单掺和双掺稀土离子Ｔｍ３＋、Ｅｒ３＋的ＣａＳ：Ｂｉ荧光粉，测定了试样的荧光光谱和有效余辉。与ＣａＳ：Ｂｉ相比，掺入Ｔｍ３＋、Ｅｒ３＋的荧光粉，Ｂｉ３＋特征发射峰４４７ｎｍ增强，有效余辉延长。表明Ｔｍ３＋、Ｅｒ３＋对Ｂｉ３＋在ＣａＳ中的发光产生了敏化作用，Ｔｍ３＋、Ｅｒ３＋在基质晶格中造成了缺隙深能级，讨论了Ｔｍ３＋、Ｅｒ３＋对ＣａＳ：Ｂｉ发光敏化作用的大小和在基质中造成缺隙能级。的深浅。     

YAG晶体中Ce^3＋对Er^3＋的敏化作用

通过求解（Ｃｅ，Ｅｒ）：ＹＡＧ和Ｅｒ：ＹＡＧ的能级跃迁速率方程，讨论了Ｃｅ＾３＋对Ｅｒ＾３＋离子的敏化作用。表明掺Ｃｅ＾３＋可增强Ｅｒ＾３＋离子１．６６μｍ波长的激光强度，但仅改变了１．６６μｍ波长激光粒子数反转，即Ｎ２（＾４Ｉ１２／２）〉Ｎ１（＾４Ｉ１５／２）与Ｅｒ＾３＋离子浓度的关系。     

Sol-Gel法和微波辐射法合成亚纳米级Zn_2SiO_4∶Mn~(2+),Er~(3+)高效绿色荧光体

用Ｓｏｌ－Ｇｅｌ法和微波法合成了亚纳米级Ｚｎ２ＳｉＯ４∶Ｍｎ２＋ ， Ｅｒ３＋ 高效绿色荧光体， 考察了Ｍｎ２＋ 单掺和Ｅｒ３＋ 敏化的荧光体的发光， 探讨了掺杂浓度对发光性质的影响， 发现Ｅｒ３＋ 可有效敏化Ｍｎ２＋ 的发光． ＳＥＭ 表明Ｚｎ２ＳｉＯ４∶Ｍｎ２＋ ， Ｅｒ３＋ 的粒度约为１５０～３５０ｎｍ ．     

YAG晶体中Cr~（3＋）→Tm~（3＋），Er~（3＋）→Tm~（3＋）的能量

研究了加入敏化离子Ｃｒ３＋和Ｅｒ３＋的Ｔｍ：ＹＡＧ晶体的吸收谱和荧光谱，计算了Ｃｒ３＋、Ｅｒ３＋、Ｔｍ３＋离子的２Ｅ、４Ｉ１３／２、３Ｆ４能态的平均寿命及能量；转移效率、转移速率．得出Ｃｒ３＋→Ｔｍ３＋转移效率为８０％，转移速率为２．１×１０３ｓ－１．由（Ｅｒ，Ｔｍ）：ＹＡＧ的荧光谱可见存在Ｅｒ３＋→Ｔｍ３＋的有效的能量转移．讨论了Ｃｒ３＋→Ｔｍ３＋和Ｅｒ３＋→Ｔｍ３＋能量转移的不同．     

铝对掺铽硅基玻璃发光强度的影响

本文通过溶胶－凝胶方法法制备了掺Ｔｂ＾３＋和Ａｌ＾３＋的硅基玻璃,并研究了Ａｌ＾３＋对Ｔｂ＾３＋发光性能的影响,结果显示Ａｌ＾３＋对Ｔｂ＾３＋的发射峰的位置没有明显影响,但通过溶胶－凝胶方法掺Ａｌ＾３＋后,所有样品中Ｔｂ＾３＋的发光强度都明显增加,掺８％－１０％的Ａｌ＾３＋的Ｔｂ－硅基玻璃中Ｔｂ＾３＋的发光强度是不掺Ａｌ＾３＋的Ｔｂ－硅基玻璃中的５倍,我们推测Ｔｂ＾３＋和Ａｌ＾３＋能级之间的关系对于能量传递是比较合适的,Ａｌ＾３＋的作用是更有效地吸收能量并完全地转移给Ｔｂ＾３＋。     

800nm激发下AlF3基氟化物玻璃中高掺杂Er3+的上转换光谱性质

在８００ｎｍ激光二极管激发下,研究高掺杂Ｅｒ＾３＋（摩尔比大于３％）的ＡｌＦ３基（ＡＹＦ、ＡＺＦ）玻璃的红外－可见上转换发光性质。在ＡＹＦ玻璃中,５５０ｎｍ绿光上转换最佳Ｅｒ＾３＋掺杂摩尔比为６％,而在ＡＺＦ玻璃中为１２％。随着Ｅｒ＾３＋掺杂量的增加,红光与绿光上转换发光强度比（Ｉｒ／Ｉｓ）增加。这被认为与两个Ｅｒ＾３＋离子（一个在４Ｉ０／２态、另一个在＾４Ｓ３／２）的交叉弛豫过程有关。同时由于此     

敏化离子Ce~(3 )对Er~(3 )∶YAG的1.6μm波长激光性能的影响

测定了Ｃｅ３＋,Ｅｒ３＋∶ＹＡＧ中Ｃｅ３＋离子的吸收截面．用从能级跃迁速率方程和激光传输方程推出的表达式计算了１６μｍ波长激光的阈值能量（功率）和斜率效率．表明在Ｃｅ３＋,Ｅｒ３＋∶ＹＡＧ中,Ｃｅ３＋对Ｅｒ３＋离子的激光性能影响与激活离子Ｅｒ３＋的浓度、晶棒大小有关．短晶棒或浓度低的晶体加入Ｃｅ３＋可降低Ｅｒ３＋的激光阈值,增加斜率效率．而长晶棒、或Ｅｒ３＋浓度高的晶体加入Ｃｅ３＋反而增加激光阈值,减小斜率效率．     

掺饵石英光纤中的受激布里渊散射

本文报导用染料调Ｑ红宝石激光（波长λ＝６９４．３ｎｍ）泵浦掺Ｅｒ＾３＋石英光纤进行的受激布里渊散射（ＳＢＳ）实验研究，测量了受激布里渊散射频，计算出掺饵石英光纤的体压缩系数，探讨了掺饵光纤中的受激布里渊散射的应用前景。     

Cd_3Al_2Si_3O_(12)玻璃中的Er~(3+)的光学跃迁

徐 迈　中国科学院长春光学精密机械与物理研究所,吉林长春１３００２１摘要：根据Ｊｕｄｄ－Ｏｆｅｌｔ理论,利用镉铝硅酸盐玻璃中Ｅｒ３＋的吸收光谱,计算了实验与理论振子强度,用最小二乘法拟合实验与理论振子强度得到了三个Ｊ－Ｏ强度参数ａ２,ｏ４,ａ６。并由此计算了ＥＪ”在不同能级之间的自发辐射系数Ａ、辐射寿命ｒ、荧光分支比β以及积分发射截面Σ。根据这些参数分析认为掺饵镉铝硅酸盐玻璃可能实现近红外激光输出。     

酞菁氯镓复合凝胶玻璃的谱学性能研究

采用溶胶-凝胶(Sol-Gel)湿化学工艺将酞菁氯镓(GaPcCl)掺入二氧化硅(SiO₂)凝胶玻璃基质,制备出均匀掺杂的GaPcCl复合凝胶玻璃,并对复合体系的红外光谱(IR)、紫外-可见吸收光谱(UV-Vis)及荧光光谱等谱学性能进行了测试。结果表明：GaPcCl的掺杂对凝胶玻璃基质的红外光谱没有产生显著影响;掺杂GaPcCl在复合体系中二聚体吸收峰的强度较其DMF溶液有所增大;掺杂GaPcCl在复合体系中荧光强度随浓度的增加远大于DMF溶液。     

纳米碳管复合凝胶玻璃结构及谱学性能研究

用物理掺杂工艺将纳米碳管引入二氧化硅凝胶玻璃基质,成功制备了纳米碳管复合凝胶玻璃,采用X射线衍射、透射电子显微镜、紫外-可见吸收光谱、红外光谱、拉曼光谱等测试方法对其结构和谱学性能进行了表征。结果表明,通过优化掺杂工艺能够实现纳米碳管与基质的均匀复合,纳米碳管本身的结构在掺杂过程中并未发生改变。纳米碳管的引入对二氧化硅凝胶玻璃基质的紫外-可见吸收光谱和红外光谱未产生显著影响。     

四取代4-异丙苯基苯氧基酞菁铅复合凝胶玻璃的结构及光限幅性能研究

采用溶胶-凝胶(Sol-gel)湿化学工艺将四取代4-异丙苯基苯氧基酞菁铅PbPc(CP)₄掺入二氧化硅(SiO₂)凝胶玻璃基质,制备均匀掺杂的PbPc(CP)₄复合凝胶玻璃,并通过紫外-可见(UV-Vis)吸收光谱和透射电镜(TEM)图像对PbPc(CP)₄在复合凝胶玻璃中的存在状态及结构进行了表征。对PbPc(CP)₄在液相体系和固相体系中的光限幅性能分别进行了测试及对比研究。结果表明PbPc(CP)₄以团簇形式存在于复合凝胶玻璃中,并由于钢性结构固相基质的保护作用使其在复合凝胶玻璃相对于液相体系中表现出较强的光限幅特性。     

掺钛空心玻璃微球制备技术

为实现惯性约束聚变靶用空心玻璃微球的均匀掺杂,采用溶胶-凝胶技术结合炉内成球法,以钛酸四丁酯为掺杂剂,对钛掺杂玻璃溶胶-钛掺杂玻璃凝胶-钛掺杂干凝胶粒子-钛掺杂空心玻璃微球（Ti-HGM）这一掺钛空心玻璃微球的制备方法进行了探索。实验结果表明:掺钛效应使空心玻璃微球壁厚均匀性、同心度有所降低,但对壁厚、直径控制基本无影响;Ti与Si原子分数比为2.23%的Ti-HGM掺杂基本均匀,近70%微球的保气半寿命在一个月以上。     

Preparation of ceramics by hydrothermal hot-pressing

Abstract

The densification mechanism of borosilicate glass, silica gel and amorphous titania powders by hydrothermal hot-pressing is described. The glass powders were densified by a viscous flow mechanism, and fully dedfied compacts were obtained by hydrothermal hot-pressing. On the other hand, porous ceramics were produced from silica gel and amorphous titania. The pore size distribution of these ceramics could be controlled by hydrothermal hot-pressing conditions. In the case of silica gel, it remained amorphous, but amorphous titaaia was crystallized to anatase by hydrothermal hot-pressing. The pore diameter and mechanical strength of the compacts prepared from silica gel increased with reaction time. The densification of the amorphous titania was improved by increasing temperature and pressure.     

四磺化酞菁镍复合乙烯基改性二氧化硅凝胶玻璃的谱学性能研究

采用溶胶-凝胶工艺,以正硅酸乙酯(TEOS)和乙烯基三乙氧基硅烷(VTES)为硅源,以VTES中的乙烯基(CHCH₂)为有机改性剂,制备乙烯基改性二氧化硅凝胶玻璃,并在此过程中将四磺化酞菁镍(NiTSPc)掺杂其中制得复合凝胶玻璃。 所得样品分别进行红外(IR)和紫外-可见(UV-Vis)吸收光谱的表征以测试其组成、结构和NiTSPc在复合体系中的存在状态。 结果表明,VTES中的乙烯基被成功地引入SiO₂网络并实现了对其改性;复合凝胶玻璃中NiTSPc的掺杂对基质的组成、结构未产生影响;NiTSPc在乙烯基改性后的凝胶玻璃基质中得到很好的分散,基本以单体形式存在。 对所得结果进行了分析讨论。     

Microfabrication of gold dots in SiO2/TiO2 glass films by two-photon absorption

Photogeneration of Au nanoparticles in SiO₂/TiO₂ glass films was carried out by two-photon absorption with a femtosecond pulse laser. Exquisite microdot-arrays of Au with micrometer spatial resolution were achieved by scanning of the focused laser beam. These structures were constructed in SiO₂/TiO₂ glass films by a sol–gel method. The sol–gel method demonstrated that Au dots microarray are fabricated at any position by two-photon absorption in the glass. The results show the utility of a two-photon absorption technique in the fabrication of complicated patterns with metal particles.     

Ge/SiO2纳米晶玻璃的制备及其荧光性质

以正锗酸乙酯和正硅酸乙酯为原料 ,合成了Ge/SiO2 纳米晶玻璃。探索了用溶胶凝胶法合成GeO2 /SiO2 玻璃 ,进而在高温 70 0℃下用氢气将其还原成Ge/SiO2 纳米晶玻璃的全过程。研究了Ge/SiO2 纳米晶玻璃的紫外吸收光谱、X射线衍射谱及荧光光谱。紫外吸收光谱显示由GeO2 /SiO2 玻璃向Ge/SiO2 纳米晶玻璃转变中有组成和结构的改变。X射线衍射谱明显显示有立方相Ge晶体颗粒在玻璃中析出。荧光光谱显示其具有荧光发射效应。根据其荧光发射峰值计算出Ge晶体颗粒平均大小为 3nm     

Properties of laminate composites reinforced with glass fabrics treated with sol-gel transition silicate gel

Glass fabric was treated with sol-gel transition silicate gel to modify the composite interface. Micro roughness on the surface of the glass fabric was observed clearly by the atomic force microscope (AFM) at the surface of glass fabric which had been treated with a base catalytic silicate gel (b-SGSi). The specific surface area of this glass was 1.4 times that of the original glass fabric. The double cantilever beam (DCB) test was carried out on glass epoxy laminate composites, using b-SGSi glass fabrics and standard glass fabrics. In this test, the former laminate showed two fracture modes, stable and unstable crack growth, whereas the latter laminate showed only stable crack growth. In reference to the fracture toughness of the stable crack growth, the former laminate is about 1.4 times greater than that of the latter laminate. It was suspected that the difference was caused by the different interface bonding strength in the composite. The interfacial bonding was also tested by the soldering iron test and substantiated the superiority of b-SGSi glass fabric to standard glass.     

Observation of nonlinear saturable and reverse-saturable absorption in silver nanowires and their silica gel glass composite

Silver nanowires (Ag NWs) and their silica gel glass composite were produced. Their nonlinear optical (NLO) properties, mainly saturable absorption (SA) and reverse-saturable absorption (RSA), were investigated at 532 and 1064 nm, using the open aperture z-scan technique and a nanosecond-pulsed laser. We found that Ag NWs demonstrate rather different NLO behaviors in liquid and solid-state matrices. The Ag NWs suspension exhibited only RSA, whereas a transformation from SA to RSA occurred in the silica gel glass composite. The underlying mechanism was proposed from the viewpoint of different environments and electronic dynamics of Ag NWs in the liquid and solid-state matrices.