长链共轭聚席夫碱的合成与红外发射率性能研究

应用溶液缩聚法,分别合成了4种不同结构(主链未含杂环和含有杂环)的长链共轭聚席夫碱;产物通过元素分析仪、核磁共振仪、紫外-可见光谱仪和红外光谱仪进行结构表征;分别测量了聚席夫碱的室温电导率和8~14μm红外发射率.结果表明芳香杂环改性的长链共轭聚席夫碱具有较高的室温电导率和较低的红外发射率.     

超宽带光纤放大器用的新型掺铋发光材料

最近,一种新型的掺铋发光材料引起了人们的关注。这种发光材料有长的荧光寿命(τ>200μs),在800nm激光激 发下发射波长在1200-1600nm区间的超宽带荧光(荧光半高宽FWHM>200nm),其发光性质与以往文献中报道的Bi3+或 Bi2+掺杂的发光材料的性质截然不同;光发射截面(σem)是光掺铒光纤放大器玻璃(EDFAG)的2-3倍,其σem×FWHM值是 EDFAG的10倍左右,σem×τ值是掺Ti3+蓝宝石的3倍左右。     

发光材料研究进展

本文对几类重要的发光材料逐一进行了评述，着重介绍了灯用荧光粉、发光二极管、有机电致发光材料、多孔硅以及长余辉材料的过去、现状和发展前景。本文也指出了其组成成分、实用范围、优缺点，有些还提出了制备方法及发光机理。     

含氰基三联苯聚噻吩液晶共轭聚合物单体合成

通过Sszuki偶联和Mitsunobu酯化等反应,设计合成了一种新型含氰基三联苯聚噻吩类液晶共轭聚合物单体,利用核磁共振(1H NMR)、红外光谱(IR)等方法表征了单体的结构.利用示差扫描量热仪(DSC)、带热台的偏光显微镜(POM)、紫外光谱(UV)和荧光光谱(PL)研究了单体液晶性和光电性能.结果表明,该单体具有近晶A型液晶态扇形织构,同时,由于三联苯的存在赋予了单体很好的紫外吸收和光致发光性能,在320 nm紫外光激发下,可发射400 nm的蓝光.     

蓝光共轭聚合物:聚(2,5-二己氧基)苯的合成及表征

以三氯甲烷为溶剂，采用三氯化铁氧化偶联反应合成了一种可溶性对称烷氧基取代聚对苯衍生物：聚（2，5-二己氧基）苯（DHO-PPP）。该聚合物可以很容易地通过溶液方式成膜，聚合物的结构通过红外光谱、核磁共振氢谱得到了确认，发现其中含有45％的聚（2，5-二己氧基-1，3）苯成分。在紫外-可见吸收光谱上，聚合物的三氯甲烷溶液的最大吸收峰位于351nm，与无取代的聚对苯相比红移了50nm。在300nm激发光下，聚合物的氯仿溶液发出了423．8nm的蓝光，表明材料是一种良好的蓝光材料。热重分析表明聚合物具有非常优异的热稳定性，在300℃时的质量损失只有2％。差示扫描量热法分析表明聚合物的玻璃化转变温度为102．34℃。X射线衍射分析表明，DHO-PPP是一种具有部分微晶结构的材料。     

含联苯PPV和柔性间隔基液晶性共轭聚合物的合成与发光性能研究

通过Wittig反应,合成了主链含有联苯共轭PPV基元及饱和柔性脂肪链间隔基的新型液晶性共轭聚合物,采用FTIR1、H NMR对其结构进行了表征。这种共轭聚合物可溶于三氯甲烷等普通有机溶剂。利用偏光显微镜、热分析和广角X射线衍射对其液晶性进行了研究,结果表明该共轭聚合物为热致性向列型液晶。利用紫外可见光谱和荧光光谱研究了其光致发光性能,结果显示该液晶性共轭聚合物可发射较强的蓝色荧光,固体膜状态下其最大发射峰为460 nm,溶液荧光量子效率为0.36。     

The Synthesis of Novel Porous Functional Materials for use as Nitrosamine Traps

Two novel porous nitrosamine traps have been synthesized in order to eliminate carcinogens from the environment. A functional mesoporous material, CuO/SBA‐15, has been synthesized by using an in‐situ coating method, with the addition of a guest salt to the reaction system to modify the porous materials before the particles of SBA‐15 were incubated; the synthesis and modification processes were performed in a single step. The resulting mesoporous composites selectively adsorb N‐nitrosopyrrolidine (NPYR), a typical volatile nitrosamine, and are potential cigarette additives that can be used for the removal of nitrosamines from cigarette smoke, thereby protecting public health and the environment. In another reaction, silica gel is modified by being coated with magnesia and then corroded by NaOH solution.The magnesia is dispersed onto the silica by impregnating it with a magnesium acetate solution, followed by calcination. After corrosion of the calcined sample with caustic soda, only the silica particles that are completely covered by magnesia remain. This material exhibits a similar ability to SBA‐15 and zeolite NaY in its selective adsorption of NPYR.     

Polymers Containing Highly Polarizable Conjugated Side Chains as High‐Performance All‐Organic Nanodielectric Materials

The discovery of nanodipolar π‐conjugated oligomer‐containing polymers as high performance nanodielectric materials with high permittivity and low dielectric loss over a wide range of frequency (100 Hz–4 MHz) is reported. Terthiophene‐containing methacrylate polymers are synthesized by reversible addition fragmentation transfer (RAFT) polymerization. Both X‐ray and thermal studies indicate the formation of small crystalline domains of terthiophene side chains dispersed in amorphous matrix. The highly polarizable and fast‐responsive nanodipoles from the nanoscale crystalline domains (<2 nm) are believed to dictate the performance. These polymers uniquely satisfy nanodipole architectures conjectured two decades ago to guide the design of high performance nanodielectric materials. This unprecedented approach can be generalized to a variety of π‐conjugated oligomer‐containing polymers for the development of high energy density capacitor materials.     

Electron‐Rich Alcohol‐Soluble Neutral Conjugated Polymers as Highly Efficient Electron‐Injecting Materials for Polymer Light‐Emitting Diodes

We report the design and synthesis of three alcohol‐soluble neutral conjugated polymers, poly[9,9‐bis(2‐(2‐(2‐diethanolaminoethoxy) ethoxy)ethyl)fluorene] (PF‐OH), poly[9,9‐bis(2‐(2‐(2‐diethanol‐aminoethoxy)ethoxy)ethyl)fluorene‐alt‐4,4′‐phenylether] (PFPE‐OH) and poly[9,9‐bis(2‐(2‐(2‐diethanolaminoethoxy) ethoxy)ethyl)fluorene‐alt‐benzothiadizole] (PFBT‐OH) with different conjugation length and electron affinity as highly efficient electron injecting and transporting materials for polymer light‐emitting diodes (PLEDs). The unique solubility of these polymers in polar solvents renders them as good candidates for multilayer solution processed PLEDs. Both the fluorescent and phosphorescent PLEDs based on these polymers as electron injecting/transporting layer (ETL) were fabricated. It is interesting to find that electron‐deficient polymer (PFBT‐OH) shows very poor electron‐injecting ability compared to polymers with electron‐rich main chain (PF‐OH and PFPE‐OH). This phenomenon is quite different from that obtained from conventional electron‐injecting materials. Moreover, when these polymers were used in the phosphorescent PLEDs, the performance of the devices is highly dependent on the processing conditions of these polymers. The devices with ETL processed from water/methanol mixed solvent showed much better device performance than the devices processed with methanol as solvent. It was found that the erosion of the phosphorescent emission layer could be greatly suppressed by using water/methanol mixed solvent for processing the polymer ETL. The electronic properties of the ETL could also be influenced by the processing conditions. This offers a new avenue to improve the performance of phosphorescent PLEDs through manipulating the processing conditions of these conjugated polymer ETLs.     

DPVBi高效、高亮度非掺杂蓝色有机电致发光器件

以典型蓝色发光材料—联苯乙烯衍生物(4,4′-bis(2,2′-diphenylvinyl)-1,1′-biphenyl,DPVBi)为发光层,采用MoO3为阳极缓冲层制备了结构简单的非掺杂型蓝色有机电致发光器件,得到了低压启动,效率、亮度和色度俱佳的蓝色发光器件。器件启亮电压为3.4V,最高外量子效率为3.2%,最高亮度达到15 840cd/m2,器件色坐标为(0.15,0.15)。高性能器件的获得归因于MoO3缓冲层的插入在阳极/有机层间形成了良好的欧姆接触。     

π-共轭希夫碱聚合物的合成及其荧光性能

共轭高聚物荧光性能的研究已成为当今的研究热点，尤其对于有一定限制的蓝色发光材料。这一波段的发光对于全色显示是不可缺少的，因此，选择适当的单体和聚合方法，合成既具有优良发光性能又能在此波段发光的共轭聚合物并对其进行研究，具有重要的理论意义和广阔的应用前景。本文以对苯二胺与乙二醛、己二胺缩聚合成了几种不同的配比的局部共轭聚希夫碱PHGP，通过红外光谱、此外光谱、元素分析、分子量测定对其进行了表征。此外，缩聚物在甲酸中可完全溶解，故对其液态荧光性能进行了研究，结果发现，PHGP是既能辐射强荧光，又易于加工处理的蓝光区发光材料。