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国家自然科学基金(60977023)

作品数:5 被引量:8H指数:2
相关作者:韦玮彭波朱永刚王鹏飞桂珞更多>>
相关机构:中国科学院中国科学院上海光学精密机械研究所西安邮电学院更多>>
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Morphology of NaNdF_4 nanocrystals from Nd(C_3H_7COO)_3·Phen and Nd(NO_3)_3·Phen (Phen,1,10-phenanthroline) as neodymium precursors
2011年
A series of NaNdF4 nanocrystals was synthesized via a facile hydrothermal route with Nd(C3H7COO)yPhen and Nd(NO3)3·Phen (Phen, 1,10-phenanthroline) as the Nd precursors. Distinct effect of the neutral donor ligand (Phen) on the morphology of NaNdF4 nanocrystals was demonstrated. When Nd(C3H7COO)yPhen was chosen and the hydrothermal reaction temperature was controlled at 220 ℃, the NaNdF4 nanocrystals with uniform short nanorod shape were obtained. The sizes of the as-prepared nanorods could be tuned by changing the hydrothermal temperatures. This method provided a useful way for the preparation of sodium rare-earth fluoride nanocrystals with controlled shapes and sizes.
崔凯高潮崔晓霞舍江波彭波韦玮
关键词:NANORODS1,10-PHENANTHROLINE
Synthesis, Crystal Structure and Optical Properties of Europium Trifluoroacetate Complexes with 1,10-Phenanthroline and 2,2'-Bipyridine
2011年
Two europium trifluoroacetate complexes, Eu(CF3COO)3.phen (1) and Eu(CF3COO)3·bpy (2) (where phen= 1,10-phenanthroline, bpy=2,2'-bipyridine), were synthesized and characterized by elemental analysis, Fourier transform infrared spectroscopy (FT-IR), photoluminescence (PL) spectroscopy and thermogravimetric analysis (TA). Single-crystal X-ray structure has been determined for the complex [Eu2(CF3COO)6·(phen)3·(H2O)2]·EtOH. The crystal structure of [Eu2(CF3COO)6·(phen)3·(H2O)2]·EtOH shows that two different coordination styles with europium ions coexist in the same crystal and have entirely different coordination geometries and numbers. This crystal can be considered as an 1 : 1 adduct of [Eu(CF3COO)3·(Phen)2·H2O]·EtOH (9-coordination part) and Eu(CF3COO)3·phen·H2O (8-coordination part). The excitation spectra of the two complexes demonstrate that the energy collected by "antenna ligands" is transferred to Eu3+ ions efficiently. The room-temperature PL spectra of the complexes are composed of the typical Eu3+ ions red emission, due to transitions between 5D0→7FJ(J=0→4). The lifetimes of 5D0 of Eu3+ in the complexes were examined using time-resolved spectroscopic analysis, and the life- time values of Eu(CF3COO)3·phen and Eu(CF3COO)3·bpy were fitting with bi-exponential (2987 and 353 us) and monoexponential (3191 us) curves, respectively. In order to elucidate the energy transfer process of the europium complexes, the energy levels of the relevant electronic states had been estimated. The thermal analyses indicate that they are all quite stable to heat.
She JiangboCui XiaoxiaHou ChaoqiGao ChaoWei WeiPeng Bo
关键词:LANTHANIDES
两性离子类有机二阶非线性光学材料研究进展
自激光在上世纪六十年代初期被发明以来,非线性光学材料成为信息时代的关键材料之一。有机二阶非线性光学材料具有结构可设计、非线性强、响应快、易于加工成型的优点,引起人们的关注。近几年来,两性离子由于具有优良的性能,成为有机二...
王进韦玮彭波
关键词:两性离子一阶超极化率
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Synthesis, crystal structure and photophysical properties of a neodymium trifluoroacetate complex with 2,2'-bipyridine被引量:4
2011年
The neodymium trifluoroacetate complexes were synthesized and characterized by single-crystal X-ray diffraction for [Nd(CF3COO)3·Bpy·(H2O)3]Bpy(1),elemental and TG analysis,FT-IR spectra,and PL spectra for Nd(CF3COO)3·Bpy(2)(Bpy:2,2'-bipyri-dine).The most interesting feature of the crystal structure for 1 is that it comprises a coordinated 2,2'-bipyridine molecule and an out-sphere 2,2'-bipyridine molecule.At the same time,the C-O distances appeared average which indicates the three atoms of carboxylato forming elec-tron-conjugate system.Hydrogen bond and π-π-stacking link the binuclear to two-dimensional sheet.The optical spectra for 2 exhibited that the complex possessed typical Nd(III) ion absorption and photoluminescence emission.The emission cross-section of 4F3/2→4I11/2 fluores-cence transition(3.63×10-20 cm2) was comparable with some laser glasses,which indicated good radiative properties of this neodymium trifluoroacetate complex in liquid matrix.The thermal analysis indicated that it was quite stable to heat.
佘江波李冬冬侯超奇杨文正韦玮彭波
一种新型流体激光介质的散射损耗被引量:2
2010年
为了研究一种新型固-液混合型的流体激光材料作为激光增益介质应用的性能,研究了其散射损耗随折射率及温度的变化规律。搭建了行波放大器实验平台,进行了该新型流体激光材料和钕玻璃固体激光材料的性能对比。实验表明,该流体材料具有典型的激光增益特性,然而其散射损耗对介质折射率和温度的变化比较敏感;在固-液相折射率匹配的条件下,散射损耗小于0.0047 cm-1。实验结果表明,通过对折射率匹配的控制,该流体激光介质可以将散射损耗控制在合理的范围内以实现显著的激光增益,具有向高能激光体系发展的前景。
桂珞侯超奇彭波范滇元韦玮
关键词:散射损耗
全氟羧酸钕2,2’-联吡啶配合物的合成及其光学特性被引量:2
2012年
合成了一系列全氟羧酸钕2,2’-联吡啶配合物:Nd(CF3COO)3.Dipy,Nd(C2F5COO)3.Dipy和Nd(C3F7COO)3.Dipy,并通过红外光谱、元素分析、热分析、紫外可见近红外吸收光谱和荧光光谱对其进行了表征。配合物的分解温度都高于260℃,最大失重温度超过340℃,说明它们具有良好的热稳定性。全氟羧酸的碳链长度和钕离子配位结构的差异,引起配合物的吸收跃迁强度的变化。根据紫外可见近红外吸收图谱,计算获得了Judd-Ofelt参数和受激辐射跃迁特性。配合物的受激发射面积分别为:3.63×10-20,2.36×10-20和1.49×10-20 cm2,可以和文献报道的无机材料媲美,它们将是非常有潜力的液体激光介质。
佘江波李冬冬王鹏飞朱永刚韦玮彭波
关键词:钕配合物液体激光JUDD-OFELT理论受激发射截面
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