氟代有机光电功能小分子材料的研究

有机电致发光材料是有机电致发光器件的基本与核心,发展新型有机光电材料也是国际上此领域的热点。在过去的几十年里,氟化通过降低能级被用来增强小分子或者聚合物的稳定性、电子传输和双极传输性能,尤其是在有机发光二极管中,特别是C-H…F相互作用（类似氢键）在固态堆积时具有重要的作用,能引起典型的π-堆积排列方式,从而增强电荷迁移率。作者研究团队系统地研究了不同位置和数目取代的氟或三氟甲基等吸电子基团对不同材料体系吸收与发射光谱、HOMO／LUMO能级、热性质以及材料的空穴传输和发光性能的影响,同时运用量化计算进行了相应的理论分析,最终发展了一系列新型空穴传输材料、双极性的主体材料以及深蓝光的荧光客体材料。     

纳米复合技术在聚合物电致发光材料与器件中的应用

纳米复合技术的问世为改善聚合物电致发光材料与器件的性能开辟了新的途径,本文论述了纳米复合技术在聚合物电致发光材料与器件中的应用及发展前景.     

噻吩类电致发光材料的能级结构及光电性能研究

用循环伏安法测试了一系列噻吩类聚合物和单体的氧化还原电位,确定了系列化合物的能级结构,比较了主链上不同取代基团及形成共聚物对聚合物能级和光电性能的影响,为高性能发光器件的制作提供了依据.结果表明,随着噻吩环3位取代烷基碳链的增长,单体带隙减小;形成聚合物有利于降低带隙;通过共聚方式引入聚合物主链的噁二唑吸电子基团可以改进其电子传输性能.     

PPV类电致发光聚合物的合成及分子设计研究

PPV类电致发光聚合物以其优良的光电性能在微电子及显示领域中得到了广泛的应用,是当今材料科学研究的热点之一.综述了PPV类聚合物的主要合成方法,并对此类材料进行了分子结构设计,同时简要地介绍了相关器件的性能.     

有机电致发光材料的能隙计算

有机电致发光材料具有可进行分子结构设计而改变其溶解性及光电性能等特点,以此为功能层、将电能转换为光能的有机电致发光二极管更是具备轻薄、高效、自发光、低能耗以及低成本可实现柔性器件等潜在优势。因此,研究合成高性能的有机电致发光材料并应用于制备可实用化的显示器及照明产品成了业界研究的热点。文中综述了以能带理论为基础,对有机电致发光材料进行结构设计改进发光性能时对将合成的材料的能隙计算的理论模型与计算方法及其应用进展,可望为聚合物发光材料的合成设计提供理论支持。     

聚合物电致发光材料及器件

聚合物电致发光器件由于其卓越的性能,在近年来取得了飞速发展,成为科研领域的又一热点。阐述了聚合物ＥＬＤ的工作原理,器件结构、聚合物材料的种类及分子结构,综述了影响器件发光效率和寿命的因素和解决办法,介绍了聚合物电致发光材料及器件的发展现状和目前存在的问题,并对其今后的发展趋势和应用前景进行了展望。     

Ⅱ-Ⅵ族半导体纳米晶在光电器件方面的应用研究进展

Ⅱ-Ⅵ族半导体纳米晶与聚合物的复合物在光电器件领域的应用近年来成为国内外研究的热点。综述了近几年来半导体纳米晶/共轭聚合物在有机/无机复合电致发光器件和太阳能电池方面的应用进展情况，着重强调了其发展历程，并对其存在的问题进行了分析，展望了其发展前景。     

白光聚合物电致发光器件及其材料的研究进展

白光聚合物电致发光器件具有低能耗、低驱动电压、绿色环保以及可制备柔性屏等诸多优异特性,被业界公认为是21世纪最具潜质和最具发展前景的高技术领域之一。此外,白光聚合物电致发光器件可通过湿法加工技术(如旋涂、丝网印刷、喷墨打印)来制作,因而其制作成本低,在显示和照明领域有着广阔的应用前景,受到人们广泛的关注。从器件和材料两个方面开展论述,简单介绍了白光聚合物电致发光的最新研究进展,并分析了实现白光聚合物电致发光器件商用化所需解决的问题。     

有机电致发光材料的研发现状

有机电致发光器件 (OLED)具有驱动电压低、主动发光等优势 ,在平板显示领域具有极大的应用前景而引起了广泛的关注。与此同时有机电致发光材料的研发也取得了很大的进展。本文介绍了近年来有机电致发光材料 (包括小分子发光材料和聚合物发光材料 )的研发状况     

聚合物电致发光材料的研究现状及应用前景

聚合物电致发光材料是近几年来取得很大进展而倍受关注的新型功能材料。电致发光薄膜器件激发电压低、发光效率高、易得到彩色显示 ,而且容易实现大屏幕平板化。本文综述这类薄膜电致发光器件的发光原理、发光材料、器件的制备方法以及改善器件特性的方法     

La0.5Y0.5Ni4.8Mn0.1Al0.1和La0.5Y0.5Ni4.8Al0.2合金的储氢性能研究

针对两种新型稀土型储氢合金La0.5Y0.5Ni4.8Mn0.1Al0.1和La0.5Y0.5Ni4.8Al0.2的储氢特性进行研究分析。实验表明,相同温度下,La0.5Y0.5Ni4.8Mn0.1Al0.1和La0.5Y0.5Ni4.8Al0.2合金的PCT曲线基本重合,且都具有优良的吸氢动力学性能;相比之下,后者的滞后系数要小于前者,吸氢量较大,吸氢速率也较快,故其储氢性能较优。300次吸放氢循环实验结果表明,La0.5Y0.5Ni4.8Al0.2合金的吸氢动力学性能虽然略有下降,但抗粉化性能较好。     

Dy0.6Tb0.3Pr0.1(Fe0.95Mn0.05)x取向晶体的结构与磁致伸缩

采用Ｃｚｏｃｈｒａｌｓｋｉ方法生长了Ｄｙ０．６Ｔｂ０．３Ｐｒ０．１（Ｆｅ０．９５Ｍｎ０．０５）ｘ（１．８５≤ｘ≤１．９５）取向合金。所有合金主相为立方Ｌａｖｅｓ相结构,择优取向不完整择优取向的方向与Ｘ的大小有关。研究了沿着这些样品的生长方向的磁致伸缩性能以及磁致伸缩性能与压力之间的关系。     

Thermal Stability of Amorphous Hydride Mg_(50)Ni_(50)H_(54) and Mg_(30)Ni_(70)H_(45)

The thermal stability of amorphous ternary hydrides Mg_(50)Ni_(50)H_(54) and Mg_(30)Ni_(70)H_(45) and their corre-sponding amorphous binary alloys Mg_(50)Ni_(50) and Mg_(30)Ni_(70) were studied with X-ray diffraction(XRD) and differential scanning calorimetry(DSC). Samples of the amorphous alloys were preparedby mechanical alloying and the amorphous hydrides were obtained by charging the alloys with gas-eous hydrogen at 3.0 MPa and 423 K. It was found that the amorphous hydrides released most oftheir hydrogen before the crystallization of the essentially hydrogen depleted amorphous alloy. Thecrystallization temperature of amorphous Mg_(50)Ni_(50)H_(54) elevated and that of amorphousMg_(30)Ni_(70)H_(45) did not change in relation to the original binary amorphous alloy. This is very excep-tional for amorphous hydrides. The reason for the effects of hydrogen absorption/desorption on thecrystallization of amorphous alloys was discussed.     

Zr65Al7.5Ni10Cu15Co2.5合金的玻璃转变温度

根据Ｚｒ６５Ａｌ７。５Ｎｉ１０Ｃｕ１５Ｃｏ２。５合金的纳米晶，晶体，液体和玻璃比热的测量结果，研究了合金的玻璃转变温度与全金的热力学函数，动力学参数以及加热速度的关系。结果表明，非晶态合金玻璃转变所需转变激活能很小，玻璃转变温度实际上是由于加热速度引起的不同状态的玻璃与液体的热力学平衡温度。     

Acousto-optic interaction in alpha-BaB(2)O(4)and Li(2)B(4)O(7) crystals

Experimental studies and analysis of acousto-optic diffraction in alpha-BaB(2)O(4) and Li(2)B(4)O(7) crystals are given. Ultrasonic wave velocity, elastic compliance and stiffness coefficients, and piezo-optic and photoelastic coefficients of alpha-BaB(2)O(4) and Li(2)B(4)O(7) crystals are determined. The acousto-optic figure of merit has been estimated for different possible geometries of acousto-optic interaction. It is shown that the acousto-optic figures of merit for alpha-BaB(2)O(4) crystals reach the value M(2)=(270 +/- 70) x 10(-15) s(3)/kg for the case of interaction with the slowest ultrasonic wave. The directions of propagation and polarization of those acoustic waves are obtained on the basis of construction of acoustic slowness surfaces. The acousto-optic diffraction is experimentally studied for alpha-BaB(2)O(4) and Li(2)B(4)O(7) crystals.     

Nanomechanical characterization of one-step combustion-synthesized Al(4)B(2)O(9) and Al(18)B(4)O(33) nanowires

Two kinds of aluminum borate nanowires, Al(4)B(2)O(9) and Al(18)B(4)O(33), were successfully synthesized by a one-step combustion method through control of the Al:B atomic ratio and synthesis temperature. Both nanowires are single crystalline but have distinguishing growth habits. Nanoindentation tests were performed directly on individual nanowires to reveal their mechanical properties. A 70% reduction in elastic modulus was found in Al(18)B(4)O(33) nanowires compared with their bulk counterpart. Al(18)B(4)O(33) nanowires exhibited higher hardness and elastic modulus than Al(4)B(2)O(9) nanowires.     

Natural Passivity of Amorphous Fe_(40)Ni_(40)P_(14)B_6 and Fe_(54.6)Ni_(38)Si_(4.1)B_(2.3)V_1 Alloys

The natural passive films forrned on Fe_(40)Ni_(40)P_(14)B_6 and Fe_(54.6)Ni_(38)Si_(4.1)B_(2.3)V_1 amorphous alloys long-term exposed in air have been studied by X-ray photoelectron spectroscopy (XPS) and Auger electron (including Ar+ ion depth profiling) spectroscopy (AES). The following aspects have been investigated: (1) chemical states of the elements in the films. binding energies and the chemical shifts measured by XPSf (2) structure and composition of the films fand (3) thickness of the passive films determined by AES depth profiling and XPS analysis.     

Plasma surface treatments of poly(l-lactic acid) (PLLA) and poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV)

The surfaces of poly(l-lactic acid) (PLLA) and poly(hydroxybutyrate-co-hydroxyvalerate) (PHBV) were modified by oxygen and nitrogen plasma treatments. The physical and chemical surface characteristics were evaluated by contact angle tests, scanning electron microscopy (SEM), atomic force microscopy (AFM), and X-ray photoelectron spectroscopy (XPS). The plasma treatments caused an increase in both contact angle and roughening, altered the surface morphology, inserted polar groups, and, consequently, enhanced the hydrophilicity for both PLLA and PHBV polymers.     

An SANS Study of Decomposition Kinetics in Amorphous Cu_(12.5)Ni_(10)Zr_(41)Ti_(14)Be_(22.5)

Phase decomposition in amorphous Cu12.5Ni10Zr411Ti14Be22.5 alloy as annealed in the super-cooled liquid range was studied by applying small angle neutron scattering (SANS). As annealed between 600 K and 700 K, the alloy was observed to decompose into two new amorphous phases,with the second phase precipitates embedded in the matrix of the first. Long time annealing of the alloy results in crystallization in addition to evolution of the decomposed microstructure.The kinetic diagram of the decomposition and crystallization for this alloy is given. The second phase precipitates have several nanometers in size and occupy a quite low volume fraction. The decomposition of the supercooled liquid in overall temperature range exhibits the features of spinodal reaction.