Synthesis and Properties of a New Two—Photon—absorbed Material DMAEAS

IntroductionSubstitutedstilbeneshavesignificantpotentialapplica tionssuchasfluorescencemicroscopy ,two photonphotody namictherapy ,opticalpowerlimiting ,three dimensionalstorage,andthree dimensionalmicrofabrication .1 4 Thesedyeshavestrongtendencyofintra molecularchargetransferundertheexcitedstate.Asaresult,theyusuallyexhibitlargetwo photonabsorption (TPA) ,inthemeanwhileemitstrongup convertedfluorescence .Ontheotherhand ,theirsolutionsgenerallydisplaylineartransmissionof >90 %atwavelengthof…     

三芳基咪唑类化合物的合成及其双光子吸收性能研究

双光子吸收是指物质分子或原子在强激光激发下同时吸收两个光子,从基态跃迁到两倍光子能量激发态的过程。目前,双光子吸收材料已广泛地应用到双光子激发显微[1]、频率上转换激射[2-3]、光学限幅、三维光信息存储[4]以及光生物学等领域。但在已报道的双光子诱导上转换荧光的有机     

一种新型蓝光发射聚合物的非线性光学性质和超快动力学

以一种新型蓝光发射聚合物多聚(5-二苯胺基)-1,3-苯乙烯(Yu1)及其单体材料5-二苯胺基苯基-1,3-二甲醛(Yu0)为研究对象, 利用飞秒Z扫描技术和泵浦-探测技术研究了这两种材料的非线性光学性质以及超快动力学. 结果表明, 聚合后, 聚合物Yu1的双光子吸收性质得到显著增强, 每重复单元的双光子吸收截面达到单体Yu0的10倍. 超快动力学研究结果揭示了Yu0和Yu1的不同弛豫过程. 聚合物Yu1的400 nm单色泵浦-探测实验结果表现出明显的各向异性: 由于激子迁移的高度方向性, 泵浦光与探测光偏振方向平行配置时观察到的快过程在偏振方向垂直配置时消失. 非线性光学性质以及超快动力学研究结果表明聚合单体对非线性性质的增强效应.     

新型蓝色上转换荧光分子的合成、表征与双光子吸收性能

设计并合成了3 个新的受体-给体-受体(A-D-A)构型上转换荧光分子,用傅里叶变换红外光谱、核磁共振氢谱、质谱和元素分析进行了表征. 测定了它们在不同溶剂中的线性吸收光谱、单光子荧光光谱和荧光量子产率. 以飞秒激光作为光源,研究了它们的双光子吸收和上转换荧光特性. 结果表明：该类化合物的荧光量子产率为0.20-0.68,双光子吸收截面为16×10^-50-101×10^-50 cm⁴·s·photon^-1,具有较强的蓝色上转换荧光发射.     

9-戊基咔唑-3,6-双-(炔苯基-4-甲酸乙酯)的合成与双光子特性研究

采用钯催化的碳碳偶合反应合成了9-戊基咔唑-3,6-双-(炔苯基-4-甲酸乙酯)(I).进一步研究了化合物I在四氢呋喃和40%四氢呋喃水溶液中的光物理性质,结果显示,化合物I在40%四氢呋喃水溶液中的紫外吸收峰位置与其四氢呋喃溶液相比没有发生明显移动,它在40%四氢呋喃水溶液中的单光子荧光发射峰出现在453 nm,较其在四氢呋喃溶液的发射有42 nm红移,其荧光量子效率为0.44.用波长为660 nm飞秒激光激发时,化合物I在40%四氢呋喃水溶液中的双光子荧光发射最大峰红移至489 nm,其双光子吸收截面值为251GM,比其在四氢呋喃溶液中的截面(151 GM)增强了60%.     

Synthesis and characterization of a new chromophor with acid/base-sensitive fluorescence emission

A new two-photon absorption compound,2-{4-((dicyanomethylidene-5,5-dimethylcyclohexl)vinyl]phenyl}imidazo[4,5- f][l,10]phenanthroline(DDVPIP),was synthesized and characterized.The one-photon excited fluorescence(OPEF) and two-photon excited fluorescence(TPEF) of DDVPIP are sensitive to the acid/base of the solution,which arc enhanced in basic solution but weakened in acidic solution.Charge-transfer(CT) states of DDVPIP were calculated through theory methods to explain its acid/ base-sensitive fluorescent properties.     

Synthesis and two-photon properties of a multipolar chromophore containing indenofluorenyl units

A new multipolar fluorophore derived from triphenylamine as the core with diphenylaminoindenofluorenyl moieties incorporated at the peripheral positions has been synthesized and experimentally shown to possess strong two-photon absorptivities in near-IR region and intense upconverted visible emission under the irradiation of femtosecond laser pulses.     

A-B2型含二苯甲酮的对硝基二苯乙烯类染料的合成、双光子性质与电化学

报道了3',4'-二(对苯甲酰基苯甲氧)基-4-硝基二苯乙烯(C1)的合成与表征. 研究了在不同溶剂中分子的吸收与荧光发射. 分子在可见光区的吸收可以归于生色团对硝基二苯乙烯部分的贡献, 而其在短波长区的吸收主要由二苯甲酮部分提供. 分子在中等极性溶剂中表现出较强的荧光发射. 系统研究了3',4'-二(对苯甲酰基苯甲氧)基-4-硝基二苯乙烯与2',4'-二(对苯甲酰基苯甲氧)基-4-硝基二苯乙烯(C2)两种A-B2型分子的双光子性质与电化学行为. 结果表明, 在800 nm波长的飞秒激光激发下, 两个分子皆表现出明显的上转换荧光发射, 其双光子吸收横截面的大小与二苯甲酮取代位置表现出一定的相关性. 分子结构优化与电化学的研究表明, 两个分子的电子密度分布与前线轨道能量亦与二苯甲酮取代位置表现出一定的相关性.     

四甲川苯乙烯菁染料的合成及其激光性能

合成了一系列四甲川苯乙烯菁染料。以Nd:YAG锁模激光倍频(532nm)作泵浦源,测定了染料的激光性能,包括激光调谐范围、中心激光波长、激光转换效率及稳定性。探讨了该类分子结构与其激光性能之间的关系。     

多枝[1,3,4]-噁二唑衍生物的双光子吸收和光功率限幅特性

采用非线性透过率法测定了多枝[1,3,4]-噁二唑衍生物的双光子吸收性质. 测定了化合物的单光子荧光光谱和双光子荧光光谱, 在800 nm波长的激光激发下, 9-乙基-3,6-双{5-(4-叔丁基苯基)-[1,3,4] 噁二唑-2-苯乙烯基}-咔唑(3)和三-{5-(4-叔丁基苯基)-[1,3,4] 噁二唑-2-苯乙烯基-4-苯基}-胺(4)能够发出很强的蓝色和黄绿色双光子上转换荧光, 荧光峰分别位于485和547 nm. 这些多枝结构化合物的双光子吸收截面较大(数值超过104 GM), 并具有很强的光限幅效应. 多枝分子中重复单元的推拉电子结构和协同效应有效地增强了分子的双光子吸收性质.     

SOS Calculation of Nonlinear Optical Properties of Synthesized ASPBPh4

1ntroductionTwo-photon absorption (TPA) is one of the first non1inear optical phenomena to havebeen experimentally observed shortly after the presence of intense laser pules. As early as1931, Goeppert-MayerL'J established the basis of quantum mechanical process for the mediumsimultaneously absorbing two photons. The select rules of two-photon absorption are differentto those of one-photon absorption. The transition probability for the absorption of two identi-cal photons is proportional to …     

二吡唑铝化合物双光子吸收性质的理论研究

应用密度泛函理论(DFT)和半经验的ZINDO方法对二吡唑铝化合物的单、双光子吸收(OPA、TPA)性质进行了研究.结果表明,铝氮烷杂环化合物具有好的双光子吸收性质,其双光子最大吸收截面值(δmax)可达到2860.1 GM(1 GM=10-50 cm4·s·photon-1).在中心、共轭桥和末端引入强的吸电子基团可调谐单、双光子吸收光谱,实现在不同波长范围的双光子吸收;利用三态公式分析了分子的双光子吸收截面变化的内在原因;铝氮烷杂环化合物与其相应的硼化合物相比,表现出类似的单、双光子吸收性质,但一定程度上可增大双光子吸收截面.     

Theoretical Studies on One-photon and Two-photon Absorption Properties of Pyrene-core Derivatives

The analytic response theory at density functional theory level is applied to investigate one-photon and two-photon absorption properties of a series of recently synthesized pyrene-core derivatives. The theoretical results show that there are a few charge-transfer states for each compound in the lower energy region. The one-photon absorption properties of the five investigated compounds are highly consistent with those given by experimental measure-ments. The two-photon absorption intensities of the compounds are greatly enhanced with the increments of the molecular sizes, in which the two-photon absorption cross section of the four-branched compound is about 5.6 times of that of the mono-branched molecule. Further-more, it is shown that the two-photon absorption properties are sensitive to the geometrical arrangements.     

钡铁氧体纳米复合材料的制备及其微波吸收性能

采用聚乙二醇(PEG)凝胶法制备了Ba(Zn1－xCox)2Fe16O27复合氧化物纳米材料，用X射线衍射分析对产物进行了表征.将制得的材料与传统的微波吸收剂铁粉结合起来，制成双层复合的吸波涂层，进行测试.实验结果表明，所制材料对微波具有良好的吸收性能.并进一步对纳米复合材料的吸波机理进行了探讨.     

两类以芴为中心的有机分子双光子吸收特性

在密度泛函理论水平上, 利用响应函数方法研究了实验新合成的两类以芴为π中心的分子(SK-G1和NT-G1)的双光子吸收特性. 计算结果表明, 这两类有机分子都具有较大的单光子和双光子光吸收强度. 在低能量范围内, NT-G1分子的最大单光子吸收峰相对于SK-G1分子来说发生了红移, 且其最大单光子吸收强度是SK-G1分子的两倍. SK-G1和NT-G1分子的最大双光子吸收均发生在第二激发态. NT-G1分子的最大双光子吸收截面约是SK-G1分子的五倍, 并且NT-G1分子存在一个较宽的双光子吸收带. NT-G1分子的较强光学性质与分子内较大的电荷转移过程有关. 采用Onsager模型计算了溶剂分子对溶质分子单光子吸收性质的影响, 理论计算结果和实验测量结果符合得较好.     

双光子吸收聚合引发剂EPVPVC的合成和非线性光学性质的研究

合成了一个新的双光子吸收聚合引发剂,9-乙基-3-{2-[4-(2-吡啶基-4-乙烯基)-苯基]-乙烯基}-9氢咔唑 (EPVPVC),用¹H NMR谱、¹³C NMR谱和元素分析进行了表征.测试了紫外吸收光谱、单光子荧光光谱、单光子荧光寿命、单光子荧光量子产率和双光子荧光光谱.量化计算结果表明,EPVPVC的双光子吸收截面为56.6×10^-50 cm⁴·s·photon^-1.在780 nm的飞秒脉冲激光激发下,EPVPVC发出较强的上转换荧光,荧光峰位于536 nm.用EPVPVC做引发剂,加入丙烯酸酯型齐聚物(cN120C80),在脉冲宽度为200 fs,重复频率为76 MHz,中心波长为780 nm 飞秒脉冲激光下,制作了一个三维周期性微结构.在理论计算的基础上,定性地探讨了其可能的聚合机理.     

Synthesis, crystal structure and optical properties of an indium phosphate K3In3P4O16

An alkali-metal indium phosphate crystal, K₃In₃P₄O₁₆, has been synthesized by a high-temperature solution reaction and exhibits a new structure in the family of the alkali-metal indium phosphates system. Single-crystal X-ray diffraction analysis shows the structure to be monoclinic with space group P2₁/n, and the following cell parameters: a=9.7003(18), b=9.8065(18), c=15.855(3) Å, β=90.346(3)°, V=1508.2(5) Å³, Z=4, R=0.0254. It possesses three-dimensional anionic frameworks with tunnels occupied by K⁺ cations running along the a-axis. The emission and absorption spectra of the compound have been investigated. Additionally, the calculations of energy band structure, density of states, dielectric constants and refractive indexes have been performed with the density functional theory method. Also, the two-photon absorption spectrum is simulated by two-band model. The obtained results tend to support the experimental data.     

Synthesis and Properties of Novel Hemicyanine Dye-β-Cyclodextrin

A series of novel hemicyanine dye-β-cyclodextrin compounds： mono-6-deoxy-β-cyclodextrin-6-[p-（p-substituted styryl）pyridium] p-totylfulfonates were synthesized by the condensation of mono-6-deoxy-β- cyclodextrin-6-（p-methyl pyridinium） p-toluenesulfonate with （un）substituted benzaldehydes. Their structures were established by 1^H NMR, IR, UV-Vis and elemental analysis. The absorption and fluorescence properties of the novel compounds were measured in solution and the photostability of a selected hemicyanine dye-β-cyclodextrin compound was also investigated.     

一种基于咔唑的新型磷光主体材料的合成及光电性能

设计并合成了一种基于咔唑的新型的磷光主体材料, 即9-(6-(9-咔唑基)己基)咔唑(hCP), 对其结构及性能进行了表征. 研究结果表明: hCP分子中两个咔唑与烷基链是非共平面的, 由于长烷基链的缠绕, 因而具有较高的三线态能级(3.01 eV)和较高的玻璃化温度(93℃); 以hCP为主体材料, 与绿光磷光染料三(2-苯基吡啶)合铱(Ir(ppy)₃)掺杂作为发光层, 制备了磷光电致发光器件, 其器件的最大电流效率为15.1 cd·A^-1, 相对于4,4'-N,N'-二咔唑基联苯(CBP)为主体材料的参考器件, 显著提高了34.8%.     

Synthesis, nonlinear optical properties and the possible mechanism of photopolymerization of two new two-photon absorption chromophores

Efficient Witting and Pd-catalyzed Heck coupling methodologies are employed to synthesize two new two-photon free-radical photopolymerization initiators 9-ethyl-3-{2-[4-(2-pyridin-4-yl-vinyl)-phenyl]-vinyl}-9H-carbazole (abbreviated to EPVPC) and 9-octadecyl-3-{2-[4-(2-pyridin-4-yl-vinyl)-phenyl]-vinyl}-9H-carbazole (abbreviated to OPVPC). The experimental results confirm that the two compounds are good two-photon absorbing chromophores and operative two-photon photopolymerization initiators. The calculated two-photon absorption cross-sections of EPVPC and OPVPC are 56.6 and 62.0×10⁻⁵⁰ cm⁴ s photon⁻¹, respectively. A microstructure by using EPVPC as initiator has been fabricated under irradiation of 200 fs, 76 MHz Ti:sapphire femtosecond laser at 780 nm. The possible mechanism of photopolymerization is discussed.