如何测定荧光量子效率.doc

如何测定荧光量子效率首先要有一个已知量子产率的标准物质，一般用硫酸奎宁。分别做标准物质和未知样品的吸收和荧光光谱。u=s(Yu/Ys)(As/Au) u待求物质的荧光量子产率；s标准物质的荧光量子产率；Yu待求物质的荧光积分面积；Ys标准物质的荧光积分面积；Au待求物质的荧光激发波长处的吸收值；As标准物质的荧光激发波长处的吸收值。测定激发光强度和荧光强度就可以了知道吧？如果已知一标准物质的量子产率，可以配置相同浓度的标准和待测物质，在相同的测量条件下，测量两者的荧光强度.未知物质的荧光量子产率=F未知/F标准*标准的量子产率。量子效率是指发射的光子数Nf与激发时吸收的光子数NX之比,即 量子效率=Nf/NX 我们知道,一般的发光总有一定的能量损失,激发光子的能量总是大于发射光子的能量.所以,量子效率通常都是小于100%.在实际测量时我们不好去测量发射的光子数Nf与激发时吸收的光子数NX,而通常用用下面的公式求算: 量子效率=发射峰的最大发光强度/激发峰的最大发光强度但是注意根据待测物的激发和发射波长的范围，选择不同激发和发射波长的基准物。请问在有机电致发光中关于量子效率中的外量子效率是如何计算的公式是什么样子的exp(eV/kT)=aP2+bP+c(1)其中V为光生电压，k为玻尔兹曼常数，T为绝对温度，e为电子电荷，a，b，c为常数。 1.Additionally,-NPN thin film emits bright blue fluorescence(461 nm) with a quantum efficiency of 8.5%,higher than that of -NPD(5.5%). 该化合物可发明亮的蓝色荧光(461 nm),积分球测定其薄膜荧光量子效率为8.5%,比-NPD的5.5%高。收藏指正 2.Their fluorescence emission properties were studied and their photolysis kinetics was investigated in different media by means of steady state photolysis method. 考察了其荧光光谱特性，发现甲氧基苯甲酰亚甲基光产碱剂的荧光量子效率较低，而萘甲酰亚甲基光产碱剂较高。收藏指正 3.The fluorescence quantum efficiency of oxazine 1 perohlorate in 1, 2-dichloro-ethane was measured with photoacoustic speetroscopy in which the fluorescence quenching wag used. 利用光声光谱技术,采取猝灭的方法对(口恶)嗪1高氯酸盐的二氯乙烷溶液进行荧光量子效率的测量。收藏指正 4.The experimental results indicate that the quantum efficiency for the emission at 1.5 m is higher upon excitation at 0.98 m than that at 0.80 m, owing to the much weaker excited state absorption (ESA) compared with those of excitation at 0.80 m. 研究表明 :由于在 0 .98m激发下 ,激发态吸收较 0 .80m激发下小得多 ,因而其 1.5m荧光发射量子效率也比 0 .80m激发下高得多 ;收藏指正 5.Fluorescence property of coumarin derivative CND_(500) with -cyclodextrin (-CD) in aqueous solution and CND_(500) with ethyl alcohol, n-saf Triton X-100 micelle solution are examined by fluorescence method. It is observed that the fluorescence peak, relative intensity (F), polarization (P), relative quantum yield (?) 用荧光法研究了香豆素衍生物CND_(500)在-CD水溶液中和在乙醇及非离子表面活性剂(n-Saf)Triton X-100等胶束溶液中的荧光特性,发现CND_(500)在-CD水溶液中的荧光强度(F),荧光偏振度(P)、相对量子效率(?)收藏指正 6.Abstract: Polyphenylacetylenes were synthesized by Rn(nbd)Cl2 and WCl6/Ph4Sn catalyst systems in N2 at room temperature.Polymers with high yield and high molecular weight were obtained.Their structures were characterized by UV,IR,NMR and GPC,respectively.The fluorescence of the polymer solution with different concentration was investigated using variable excitation wavelength from UV to visible region.The relation between fluorescence and polymer structure was studied.The results showed that the molecular chain structure has great influence on fluorescence of the polymers.The emitting peak wavelength of fluorescence for the polymer of high stereoregularity is independent of solution concentration and excitation wavelength.The emitting peak wavelength of fluorescence for the polymer with disordered molecular chain arrangement varies with changing the solution concentration and excitation wavelength,and different emission sites in molecular chains and low emitting yield are shown.The measurement and analysis of fluorescence spectroscopy of polyphenylacetylenes may provide some useful information to judge the molecular chain arrangement in some conjugated polymers. 文摘:使用有机金属铑、金属钨/四苯基锡催化剂体系聚合苯乙炔，分别获得了高产率和高分子量的聚苯乙炔.使用UV，IR，NMR，GPC等分别对聚合物结构进行了表征.采用不同波长的激发光对聚合物荧光性能进行研究，详细分析了聚合物结构与荧光性能之间的关系.研究结果发现，不同聚合物结构对聚合物荧光性能产生很大影响，规整性高的聚合物，将有较高的发光量子效率；聚合物规整性差，将可能导致多个荧光发光结构点，其荧光强度降低.聚合物荧光光谱研究将对某些共轭聚合物结构的规整性分析提供一些有用的信息.收藏指正 7.The rate constant and the efficiency of main energy trasfer process were calculated from fluorescence lifetime, phosphorescence lifetime,quantum yield and time-resolved spectra of I3MK and I3MK-Tb()stsyem. Accordingly,the dynamics of the energy-transfer process in this system was analysed. A modification of the perrin formula was proposed and the mechanism of the energy transfer of the complex system was disscussed. 从I3MK和I3MKTb（）体系的荧光寿命、磷光寿命、量子产率，时间分辨光谱等，计算了各主要能量传递过程的速率常数和能量传递效率，进行了该体系能量传递过程的动态分析，提出了Perrin公式的修正参数，讨论了I3MKTb（）体系的能量传递机理收藏指正 8.The results showed that with the increasing water stress,Fv/Fm,Fv/Fo,Yield,qP and Photo values decreased,while qN,which reflects the protective mechanism of light energy,increased significantly. 研究结果表明,叶片的叶绿素荧光参数PSII原初光能转换效率(Fv/Fm)、PSII潜在活性(Fv/Fo)、光合量子产额(Yield)、光化学淬灭系数(qP)和净光合速率(Photo)值随水分胁迫强度增强而呈下降的趋势;收藏指正 9.Either of the two stresses increased minimum chlorophyll florescence(F0),and decreased maximum chlorophyll fluorescence(Fm),PSprimary chemical efficiency(Fv/Fm)and PSpotential activity(Fv/F0),but did not significantly result in variation in quantum yield of PS linear electron(PS) relative to the un-stressed control. POD activity,MDA and Pro contents were significantly raised by drought or salinity. 干旱或盐胁迫引起初始荧光(F0)上升,最大荧光(Fm)、PS原初光能转化效率(Fv/Fm)和PS潜在活性(Fv/F0)显著下降,PS实际光化学量子产量(PS)略有降低,而POD活性、MDA和Pro含量显著提高。收藏指正 10.The results showed that the diurnal variation of PS II primarily chemical efficiency (Fv/Fm), quantum yield of PS II linear electron(OPS II) and estimated electron transport rate (ETR) in 6 rice varieties related to light intensity. 进一步系统研究上述品种在孕穗期连体倒二叶片功能叶)的荧光参数的日变化，并解析了它们与耐光氧化和耐荫特性的关系。 结果表明：6个水稻品种叶片的原初光化学效率(FvFm)，实际光化学量子产量(PS)和通过PS的电子传递速率(ETR)的日变化与光强有关。荧光粉及荧光量子效率检测系统 The above picture shows a system for determining the quantum efficiency of phosphor powder samples used in the lighting industry. Up to 6 samples can be loaded into the motorised carousel. A calibrated Hg source, with closed loop controller for necessary stability, is used to excite the phosphors. Significantly, the temperature of each sample can be heated to 200oC 1oC all under software control. A carefully designed integrating sphere is used to collect all of the emitted light which is measured by a spectroradiometer system. Besides quantum efficiency of the phosphors and function of operating temperature, the system also provides full spectral emission and chromaticity data. 荧光量子效率的测定分类:有机合成2007.9.16 00:54 作者：过路庄子 | 评论：1 | 阅读：619 物质吸光跃迁至激发态后,可能会发生荧光发射、内转移，系间窜跃和外转移等过程,也就是说,荧光发射只是多个竞争过程中的一个,因此,需要引入荧光量子效率的概念来衡量物质荧光发射的能力.定义: 荧光量子效率=发射荧光分子数 / 激发分子总数目前测定荧光量子效率最通用的是所谓Optica