光电耦合器的原理及应用

光电耦合器是一种光电结合的器件,它由两部分组成:输入端由发光器件组成;输出端由光接收器件组成.目前国内外的光电耦合器输入端大都使用发光二极管——砷化镓发光二极管,输出端大都使用硅光电二极管或硅光敏三极管,结构见图1.     

竹红菌素作为激发态氧分子的光敏剂的研究

近年来,竹红菌素(Hypocrellin A and B,简称HA和HB)及其衍生物在光疗技术上的应用,尤其是在癌症和艾滋病的治疗上的应用,越来越引起人们的重视[1~8].     

含长链烷基吡啶卟啉LB膜的表征及光电性能的研究

两亲性卟啉 5 ,1 0 ,1 5 ,2 0 四 ( 4 十六烷基吡啶基 )卟啉溴化物 (TC16PyP)在气 液界面上具有良好的成膜性能 .用UV Vis光谱、荧光光谱和小角X射线衍射(LAXD)对该化合物LB膜的结构研究表明 ,制备的LB膜结构均匀、性能稳定 .采用双池双电极体系 ,通过由在SnO2 导电玻璃上制备的TC16PyPLB膜组成的光电池 ,研究了TC16PyP的光电化学性质 .实验结果表明 :由该化合物LB膜组成的光电池可产生较大和较稳定的光生光电流和光电势 ,利用这种LB膜制成的光电转换器件具有潜在的应用价值     

卟啉与吩噻嗪分子间和分子内的光致相互作用

光动力疗法（ＰＤＴ）药物研究的一个重要分支是合成新的含卟啉结构的化合物,以获得较好的癌组织细胞定位能力和较强的组织穿透能力［１］．Ｍｅｈｔａ等［２,３］发现卟啉和一些具有细胞内识别能力的抗癌分子组成的二元化合物表现出较强的光诱导核酸酶活性,同时不改变...     

Interaction between hypocrellin and aliphatic amines

The interaction of hypocrellin, including hypocrellin A (HA) and hypocrellin B (HB), with aliphatic amines in deaerated solutions has been studied by ESR and nanosecond transient absorption spectra. In polar solvents, the acid-base interaction between hypocrellin and amines was observed without irradiation. The signals of semiquinone radical anions of hypocrellm and the spin-trapping adduct of α-phenyl-N-tertbutyl-ratrone (PNB) with the aminoalkyl radicals have been detected in photoinduced ESR studies. The transient absorption of excited triplet state of HA and semiquinone radical anion of HA have been observed in laser flash photolysis studies.     

发展知识产权战略是企业创新的重要动力源泉

简要论述了知识产权战略是企业进行技术创新的动力和源泉,并从3个方面论述了作为一家高新技术企业如何加强自身的知识产权能力建设,继而在市场竞争中立于不败之地。     

竹红菌甲素和乙素及其类似物的电子光谱研究

本文详细研究了4,9-二羟基-3,10苝醌美化合物的吸收光谱和荧光光谱。证明它们在可见光范围内的三个吸收带分别由苝醌共轭体系的ππ~*跃迁和分子内质子传递引起。它们在稀溶液中的荧光光谱是由中性单分子荧光峰和它们进行激发态质子传递后形成的偶极离子的荧光峰组成,在浓溶液中长波方向的峰是由偶极离子的荧光峰和它们的激基缔合物的荧光峰迭加而成。竹红菌甲素和乙素晶体的荧光峰只有偶极离子和激基缔合物的荧光峰,而没有发现中性单分子的荧光峰。     

竹红菌乙素与醇胺的作用

竹红菌是在我国首次发现,并用于临床的一种新的光敏色素,可作为光动力治疗药物,对于许多皮肤病有显著疗效。最近还发现,竹红菌能选择性地富集于某些肿瘤细胞,并有效地抑制其生长。竹红菌素含有两种主要成份:竹红菌甲(HA)和竹红菌乙素(HB),它们都是茈醌类衍生物。本文对HB 和乙醇胺反应后得到的三种主要产物的光敏氧化蒽的相对速度和自敏光氧化相对速度进行了测试。     

Photoinduced intramolecular electron transfer between fluorescein and carbazole

Several dyads consisting of a fluoreseein covalently linked with a carhazole at site 2 or site 6 have been synthesized and characterized.Studies of absorption spectra,emission spectra and fluorescence lifetime quern hing Indicate that the ground-state interaction between fluorescein and carhazole in dyads is negligible and the intramolecular electron transfer (ET) reactions are mainly of dynamic process.Moreover,the efficiency and raie conslam of lectron transfer reactions in ZFO4 (carbazole linked at site 2'of fluorescein) are larg er than those in 4FOZ (carbazole linked at site 6 of fluorescein) 0 74; KET 11×108S-1),because the mutual orientation of donor and acceptor in ZFO4 is nearly face-to-face,which is more favorable to the process than the shoulder-to-shoulder mutual orientation in 4FOZ.Estimations are also formed of the free energy change of the photomduced electron transfer and the back reactions in the dyads.     

Photoinduced intermolecular and intramolecular actions between eosin and porphyrin

Two dyads of eosin and porphyrin linked with a semi-rigid (-CH2phCH2-) or flexible (-(CH2)4-) bridge and their reference model compounds were synthesized and characterized The intermoleccular interaction and intramolecular photoinduced singlet energy transfer and electron transfer were studied by their absorp tion spectra,fluorescence emission,excitation spectra and fluorescence lifetime The model compounds,ethyl ester of eosm (EoEt) and porphyrin (PorEt),could form complexes in the ground state.When the eosin moieties in dyads were excited,they could transfer some singlet energy to the porphyrins; in the meantime,they could also ndsce electron transfer between two chromophores.Exciting the porphyrin moieties in dyads could induce electron transfer from eosin moieties to porphyrin moieties.The efficiencies (EnT,ET) and rate constants (kEnT,kET) were related to the polarity of solvents and mutual orientation of the two chromophores in dyads.