电化学处理对П共轭聚合物阳极特性的改善

研究了电化学对聚合物发光二极管空穴注入和传输层(PEDOT薄膜,polyethylene dioxythiophene)的掺杂处理.由这种薄膜与ITO(indium-tin oxide)构成的双层阳极明显地改善了器件性能,当以MEH-PPV(poly(2'-methoxy,5(2'-ethyl-hexyloxy)-1,4-phenylene vinylene))为发光聚合物时,器件的工作电压得到了降低;当以PFO(poly(2,7-dibromo-9,9-dioctylfluorene))作为发光聚合物时器件的最大外量子效率提高到0.6%.     

聚合膜/无机膜异质结电致发光机理研究

针对聚合物电致发光材料缺乏可用的电子型聚合物半导体材料的现状，采用无机电子型半导体材料ZnO:Zn与空穴型聚合物材料PDDOPV[poly(2,5-bis(dodecyloxy)-phenylenevinylene)]成功制备了结构为ITO／PDDOPV／ZnO：Zn/Al的异质结双层器件，异质结器件的发光效率与单层器件P的发光效率的比值在电压为8V时达到最高值38.6倍，此时异质结器件的亮度是器件P的19.4倍，异质结的电流是单层器件的0.5倍。结果表明，ZnO:Zn薄膜的插入，确实能够起到输运电子和阻挡空穴从而降低器件电流水平，提高器件发光效率的作用，而且，聚合物膜／无机膜异质结器件的发光颜色是随着电压的增加而蓝移的。研究认为有可能是形成了新的发光基团。     

掺杂型有机电致发光器件

成功制备了可溶性电子型聚合物PPQ [poly (phenylquinoxaline) ]掺杂的可溶性空穴型聚合物PDDOPV[poly(2 ,5 bis (dodecyloxy) phenylenevinylene) ]的单层发光器件。与具有相同厚度的纯PDDOPV的单层器件相比 ,起亮电压从 4 .5V降低到 2 .6V ,在电压相同的条件下 ,掺杂的单层器件的电流和纯PDDOPV的单层器件在同一个数量级 ,但其亮度和发光效率均比未掺杂器件提高 1个数量级以上。结果表明 ,在可溶性空穴型聚合物中掺杂可溶性电子型聚合物是提高器件性能的有效方法。     

聚合物电致发光器件的电流限制机制

以共轭聚合物聚(2-甲氧基-5-(2′-乙基-己氧基)-1,4-对苯乙炔)为发光材料制备复合阴极结构（LiF/Al）的聚合物电致发光器件.针对不同发光层厚度和阴极修饰层厚度的器件进行电流-电压测试,研究引起器件电流限制的机制.结果表明,单金属阴极器件的电流特性为载流子输运体限制机制；当阴极修饰层（LiF）厚度为2 nm左右时,电流特性以载流子注入限制为主；而当阴极修饰层为其他厚度时,2种限制机制同时存在.对具有不同阴极修饰层厚度的器件的电流-电压特性提出理论模型,模拟结果与试验数据较为符合.     

溴基钙钛矿量子点发光二极管的制备及性能优化

为了研究量子点发光层薄膜厚度对钙钛矿量子点发光二极管(perovskite quantum dot lightemitting diodes,PeLED)电-光转换效率的影响，采用配体辅助再沉淀法(ligand assisted reprecipitation,LARP)室温合成铯铅溴(CsPbBr₃)钙钛矿量子点，并用其制备出稳定绿光发射的PeLED．通过比较不同发光层厚度CsPbBr₃ PeLEDs的发光效率，获得量子点发光层的最佳膜厚为43.2 nm．采用CsPbBr₃作为PeLED发光层时的器件外量子效率(external quantum efficiency,EQE)较低，为提高PeLED的电-光转换效率，用FASn_0.3Pb_0.7Br₃量子点替代CsPbBr₃作为发光层，并选用聚乙烯基咔唑(polyvinylcarbazole,PVK)、聚[(N,N’-(4-正丁基苯基)-N,N’-二苯基-1,4-苯二胺)-ALT-(9,...     

增透膜的选择

在光学器件中，由于器件(如透镜、棱镜)表面的反射作用而使光能损失，为了减少光学器件表面的反射损失，常在器件表面镀上一层透明介质薄膜(称为增透膜)，增透膜的效果与介质薄膜的折射率、厚度等相联系。本文以光波的电磁理论为基础，讨论了光波入射介质薄膜的反射，推导出了反射率公式，并进行了讨论。结果表明：当介质薄膜的厚度d=λ0/4n2(2k 1)时，反射率有最小值Rmin=(n1n3-n2^2/n1n3 n2^2）（k=0，1，2…，n1，n2，n3分别为空气、介质薄膜、光学透镜的折射率，λ0光波在真空中的波长)，而当介质薄膜的折射率，n2=√n1n3时，反射率R=0，基本上无反射。     

可控构筑亚微米多孔结构复合热电柔性薄膜

为研究柔性与热电性能优异的聚合物基薄膜，以聚醚砜（polyether sulfone, PES）柔性滤膜为基体，通过气相聚合法，构筑具有亚微米多孔结构的聚（3, 4-乙烯二氧噻吩）-对甲苯磺酸盐（poly(3, 4-ethylenedioxythiophene)-tosilate, PEDOT-Tos）/PES复合热电柔性薄膜，分析氧化剂的质量分数（10%～25%）和气相聚合时间对薄膜微观结构及热电性能的影响．研究结果表明，在氧化剂质量分数为20%，聚合时间为2.5 h时，可得到具有亚微米多孔结构与优异热电性能的PEDOT-Tos/PES复合薄膜，其电导率和Seebeck系数分别为（274±9） S/m和（13.8±0.5）μV/K，并且在一定的弯曲形变下表现出稳定的热电性能．该研究为制备优异柔性与热电性能的自支撑导电聚合物基薄膜提供了简便、可行的方案．     

未掺杂条件下载流子平衡提高有机电致发光器件效率的研究

用具有高电子迁移率(5×10-4cm2 V-1 s-1)的材料4,7-diphenyl-1,10-phenanthroline(BPhen)作为电子传输层(ETL),N,N-his-[1-naphthy(-N,Ndiphenyl-1,1'-biphenyl-4,4'-diamine)](NPB)作空穴传输层(HTL),tris(8-hy-droxyquinoline) aluminum(Alq3)作发光层(EML),使有机薄膜电致发光器件的效率得到显著改善.器件基本结构为:ITO/NPB/Alq3/BPhen/LiF/A1.通过对HTL和ETL的厚度进行优化,在电流密度为20mA/cm2时,器件的电流效率达到6.80cd/A,亮度达到1361 cd/m2.为了探索发光器件的效率得以改善的原因,制备了结构为ITO/A1q3/BPhen/Al的electron-only器件和结构为ITO/NPB/AI的hole-only器件.通过调整hole-only器件中空穴传输层(HTL)和electron-only器件中电子传输层(ETL)之间的厚度匹配并比较它们之间的J-V曲线,发现当电子和空穴达到栽流子平衡时,发光器件获得最佳效率和亮度.     

阴极材料对聚合物发光二极管特性的影响

报道了基于聚（9.9-二辛基芴-4.7-二噻基苯并二唑）（PDOF-DBT,M(DOF):m(DBT)=85:15)的双层聚合物发光地极管（PLEDs)在使用碱金属、碱土金属和绝缘材料为阴极时表现的各种特性,当以厚度为3nm左右的Ba作为阴极时,器件表现出较好的性能;外量子效率为1.6%,最大的发光亮度接近4000cd/m^2,结果表明PDOF-DBT与这种阴极的交界面具有较好的能级匹配以及电荷注入平衡。     

具有双发光层双主体结构的高效稳定WOLED

采用双发光层双主体结构,制备了高效稳定的白光有机电致发光器件(WOLED)。其中蓝光层是TBADN:3 wt%DSA-Ph,红光层是[TBADN:Alq3]:1 wt%DCJTB,通过改变红光层中Alq3和TBADN的掺杂比来调节器件的发光效率和颜色。当[TBADN:Alq3]为75∶25时获得了效率最高、色度好和性能稳定的白光,在20 mA/cm2时器件的发光效率为6.27 cd/A,CIE色坐标为(0.364,0.348)。当电流密度为200 mA/cm2时,发光效率仍能保持在6.15 cd/A,色度坐标为(0.344,0.344)。由于在[TBADN:Alq3]双主体结构中,TBADN具有双极性,从而改善了器件中载流子的平衡及其在发光层中的分布,进而提高的器件的性能。     

聚（3，4-乙撑二氧噻吩）:聚苯乙烯磺酸阳极缓冲材料的改性研究

聚（3,4-乙撑二氧噻吩）:聚苯乙烯磺酸（PEDOT:PSS）是导电聚合物领域的明星分子,具备可见光透过率高、易低温溶液加工且廉价等优点,常作为标准阳极缓冲材料（ABM）广泛应用于叠层有机光电器件领域中。然而,随着半导体材料和器件结构的飞速发展,对ABM提出了更高要求,当前PEDOT:PSS的性质参数无法很好满足新一代有机光电器件的需要（如电导率较低、功函数较小、酸性较强和亲水性较强等）,成为制约有机光电器件性能提升的重要瓶颈。改变导电聚合物的结构可有效优化其性质参数、大幅提升有机光电器件性能,备受关注。本文首先详细阐述PEDOT:PSS的结构特征（包括溶液和固体两种状态的结构特征）,揭示PEDOT:PSS的结构与性质的关系,然后综述外加剂和新型掺杂剂（PSS替代物）改变PEDOT导电聚合物结构和性质的改性研究进展,最后展望PEDOT:PSS ABM领域的改性研究发展趋势。     

Synthesis and Bio-activities of Poly(3,4-ethylenedioxythiophene)(PEDOT)/Poly(styrene sulfonate)(PSS)/Gelatin Layer on Indium Tin Oxide(ITO)-coated Glass

Poly(3, 4-ethylenedioxythiophene)(PEDOT), together with its dopes, such as poly(styrene sulfonate)(PSS), has been acknowledged to have a wide range of biomedical applications as an important conducting polymer. In this study, gelatin can be polymerized into PEDOT/PSS polymers on indium tin oxide(ITO)-coated glass. PEDOT/PSS/gelatin layer on ITO-coated glass significantly decreases electrochemical impedance spectroscopy(EIS) and increases charge delivery capacity relative to the gelatin layer and bare ITOcoated glass, comparable to the PEDOT/PSS layer on ITO-coated glass. PEDOT/PSS/gelatin layer on ITOcoated glass enhances pheochromocytoma(PC 12) cell affinity, possesses a high biocompatibility and promotes PC 12 cell growth by delivery of electrical stimulation. These results suggest that gelatin can be incorporated into the PEDOT/PSS polymers through electrochemical polymerization and the PEDOT/PSS/gelatin layer on ITO-coated glass possesses high electrochemical and biological activities.     

不同电导率的PEDOT对聚合物光电池性能的影响

采用几种具有不同电导率的PEDOT(poly (3,4-ethylene dioxythiophene)),研究其对器件性能的影响,结果表明高电导率的PEDOT与ITO(Indium tin oxide)一起作为光电池的阳极,有利于光电池能量转换效率的提高,探讨了高电导率PEDOT的厚度与器件性能之间的相关性,表明在保证器件不漏电的前提下PEDOT的厚度越薄越好.     

UV irradiation induced conductivity improvement in poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) film

We describe a simple method to increase the conductivity of poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate)(PEDOT:PSS)film by exposure to ultraviolet(UV)light in vacuum.Up to four order of conductivity improvement(from 10 3to 50 S/cm)is achieved by irradiating PEDOT:PSS film with 254 nm ultraviolet(UV)light.Increased conductivity in UV treated PEDOT:PSS film is stable under ambient exposure.The mechanism for conductivity improvement is investigated by current-voltage measurement,atomic force microscopy,and absorption spectrum.Photo-cross-linking of PSS chains is determined as the reason for conductivity improvement.Our result demonstrates that UV treatment is capable of modifying the conductivity of PEDOT:PSS film independent of the process of film formation.     

Gas sensitivity of poly (3, 4-ethylene dioxythiophene) prepared by a modified LB film method

An arachidic acid/poly (3, 4-ethylene dioxythiophene) (AA/PEDOT) multilayer Langmuir-Blodgett (LB) film was prepared by a modified LB film method. The theories were utilized to explain the effects between HCl molecule and LB film. The gas sensitivity mechanism of poly (3, 4-ethylene dioxythiophene) (PEDOT) multilayer film can be explained by the charge transfer between p system of PEDOT and oxidization HCl system. The gas sensitivity of PEDOT LB film deposited interdigital electrode to HCl was tested. The results showed that film thickness, treating temperature, deposition speed had different influence on film gas sensitivity. The AA/PEDOT film deposited device exhibited nonlinear behavior to HCl gas at lower concentration (20-60 ppm) and linear response behavior at higher gas concentration was observed. The time of the compound LB film of the AA/PEDOT responding to the 30 ppm HCl gas is about 20 seconds, which is far quicker than the time of the film to the PEDOTPRESS film(about 80 seconds). It is not higher film press to better film. When the film press attains 45 mNs/m, the sensitivity of the AA/PEDOT film on the contrary descends.     

Improvement of luminescent stability from carbon nanotube field emission display based on printed CNT film

Recently, as the applications of carbon nanotubes (CNTs) in field emission display (FED) are broadly and deeply studied [1-7], the luminescence stability of CNT-FEDs have become more and more important. Generally speaking, the impact factors on the lumi- nescent stability include surface reactions between CNTs and gas molecule [8] and the damage at the nanotubes [9] or the CNT-substrate interface [10] caused by resistive heating from high-current field emission. Since the screen printin…     

新型电致发光聚合物的合成

根据电致发光原理,经过精妙的分子结构设计,我们合成了一种新型芴类电致发光聚合物,该聚合物既包含空穴传输性能优良三苯胺单元,又含有电子亲和性很强的氰基官能团.所以该聚合物具有较为平衡的载流子迁移率,有望成为高性能的电致发光材料用作聚合物电致发光器件的发光层.     

Analysis on the characteristic properties of PEDOT nano-particle based on reversed micelle method

Based on the study of a new type of conducting polymer poly (3,4-ethylenedioxythiophene) (PEDOT),we focussed on the preparation and characteristics of PEDOT nanoparticles made by reversed micelle method.Moreover,we deeply investigated the optical,electrical and the thermal stability of PEDOT nanoparticles.The main results are as follows: the small-sized PEDOT nanoparticles were prepared and utilized by different methods,such as ultraviolet/visible (UV-Vis) spectroscopy,Fourier-transform infrared (FT- IR) spectrum,scanning electron microscopy(SEM) and so on.The results show that the amount of oxidizer,ultrasonic treatment,polymerizing temperature and doping degree can influent morphology,electrical ability and gas sensitivity of PEDOT nanoparticles.The Bragg peaks of nanoparticles at 6.7°,12.7°,25° were observed by XRD and the better orientation of molecular chain was attributed to the effective doping of toluene-p-sulfonic acid,which also resulted in an enhancement of thermal stability of nanoparticles than conventional PEDOT.     

聚合物白光发光二极管的研究进展

针对聚合物白光发光二极管(WPLEDs)在显示和照明领域广阔的应用前景,从器件结构和相关材料方面进行了讨论.从结构上将白光器件分为单发光层器件和多发光层器件;从发光材料的性质上将白光器件分为荧光器件、磷光器件和单一高分子白光器件.通过探讨各种器件的优势和不足,提出了各种器件的发展方向,并对WPLEDs面临的机遇和挑战做...