Simple and Efficient Generation of White Light Emission From Organophosphorus Building Blocks

This paper describes a structure–property study using two dithieno[3,2‐b;2′,3′‐d]phosphole building blocks for the generation of white light emission and the incorporation of these units in a single polystyrene material. The emission of one of the light‐emitting organophosphorus building blocks can efficiently be switched from orange to green by simple protonation of the amino functional groups that are part of the π‐conjugated scaffold. The resulting three components (blue, green, and orange) exhibit photophysical properties that allow for an efficient fluorescence resonance energy transfer (FRET) in the mixture/polymer and provide intense white fluorescence upon excitation of the blue component; the fluorescence is close to pure white in solution and similar to the emission of an incandescent light bulb in the thin film. The results nicely illustrate the intriguing features that can be obtained by exclusively using organophosphorus‐based organic electronic materials.     

Electron Transfer around a Molecular Corner

The distance dependence of electron transfer (ET) is commonly investigated in linear rigid rod‐like compounds, but studies of molecular wires with integrated corners imposing 90° angles are very rare. By using spirobifluorene as a key bridging element and by substituting it at different positions, two isomeric series of donor‐bridge‐acceptor compounds with either nearly linear or angled geometries were obtained. Photoinduced ET in both series is dominated by rapid through‐bond hole hopping across oligofluorene bridges over distances of up to 70 Å. Despite considerable conformational flexibility, direct through‐space and through‐solvent ET is negligible even in the angled series. The independence of the ET rate constant on the total number of fluorene units in the angled series is attributed to a rate‐limiting tunneling step through the spirobifluorene corner. This finding is relevant for multidimensional ET systems and grids in which individual molecular wires are interlinked at 90° angles.     

Die Korrektur des Bildes der Anger-Kamera (Teil II)

Ausgehend von der im ersten Teil begründeten Notwendigkeit, die mit der Szintillationskamera Impulsverteilung korrigieren zu müssen, wird in der vorliegenden Arbeit der Programmablanfplan für diese Korrekturrechnung mit Hilfe der elektronischen Datenverarbeitung (R 300) erläutert. Im gegenwärtigen Stadium der Entwicklung eines umfangreichen Konzepts zum Einsatz der EDV für die Szintigraphie – an der alle Nuklearmedizinischen Abteilungen der DDR beteiligt sind – erfolgt bei den Autoren die Ein- und ausgabe der Daten über Lochstreifen. Die Wirkung der Korrekturrechnung wird am homogenen Phantom selbst und an einer Pankreasunfersuchung demonstriert.     

Dicarboxylic imide‐substituted poly(p‐phenylene vinylenes) with high electron affinity

Synthesis of n‐type organic semiconductors with high electron mobilities, good environmental stability, and good processability is an urgent task in current organic electronics. This is because most of π‐conjugated materials are p‐type and prefer to transport positive hole carriers. In this article, a series of new dicarboxylic imide‐substituted poly(p‐phenylene vinylenes) (DI‐PPVs) were first synthesized. They exhibited a high electron affinity of 3.60 eV and thus are able to transport electrons. The polymers showed tunable solubility in common organic solvents and high chemical and thermal stability. They remain rigidity of the PPV backbone, and strong interchain π‐stacking was observed in thin films by X‐ray diffraction measurement. All these suggested that these polymers could serve as good candidates as n‐type semiconductors in organic electronic devices such as n‐channel field‐effect transistors and all polymer‐based solar cells. © 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 186–194, 2010     

Organic Solid Solutions: Formation and Applications in Organic Light‐Emitting Diodes

To enhance the performance of organic devices, doping and graded mixed‐layer structures, formed by co‐evaporation methods, have been extensively adopted in the formation of organic thin films. Among the criteria for selecting materials systems, much attention has been paid to the materials' energy‐band structure and carrier‐transport behavior. As a result, some other important characteristics may have been overlooked, such as material compatibility or solubility. In this paper, we propose a new doping method utilizing fused organic solid solutions (FOSSs) which are prepared via high‐pressure and high‐temperature processing. By preparing fused solid solutions of organic compounds, the stable materials systems can be selected for device fabrication. Furthermore, by using these FOSSs, doping concentration and uniformity can be precisely controlled using only one thermal source. As an example of application in organic thin films, high‐performance organic light‐emitting diodes with both single‐color and white‐light emission have been prepared using this new method. Compared to the traditional co‐evaporation method, a FOSS provides us with a more convenient way to optimize the doping system and fabricate relatively complicated organic devices.     

一种新型现场多道核能谱数据采集系统的设计

介绍了一种新型现场多道核能谱数据采集系统的设计，详细阐述了设计思路，提出了可行性方案，给出了重要功能模块及采取的关键技术，并重点针对现场核能谱数据采集系统的低功耗、实时性和高性能设计进行了研究，最后给出了其主要技术指标及实测Cs标准源谱线，结果表明该系统功能完善，功耗低、性能可靠。     

对辐射感应闭锁窗口现象的解释

中、大规模CMOS器件受到瞬态辐射时，出现了闭锁单窗口、多窗口现象。为了获得闭锁窗口的出现原因，借助对窗口现象的有关参考文献的研究，利用计算机电路模拟软件，分析了CMOS器件多个闭锁路径之间的相互作用。在此基础上，提出了解释窗口现象的“三径”闭锁模型。应指出的是，该闭锁模型还需要试验上的进一步验证与支持。     

量子电子器件——谐振隧道晶体管(RTT)

本文介绍了RTT的概念和谐振隧穿双势垒(DB)的理论,综述了RTT的最新进展,其中包括基区和发射区内有DB的谐振隧道双极晶体管(RTBT)、多态RTBT、超晶格RTBT、双极量子RTT(BiQuaRTT)和单极量子线RTT。     

摩托罗拉CAN通信物理接口芯片MC33388的原理及应用

MC33388是美国MOTOROLA公司推出的专用于汽车车身控制的CAN物理接口芯片。该芯片抗干扰能力强，工作温度范围宽，且具有一定的容错功能，十分适合于环境较复杂的汽车电子应用领域。文章主要介绍了MC33388的特点、内部结构及典型应用。     

Decoherence in elastic and polaronic transport via discrete quantum states

In this work we study the effect of decoherence on elastic and polaronic transport via discrete quantum states. Calculations are performed with the help of a nonperturbative computational scheme, based on Green’s function theory within the framework of polaron transformation (GFT-PT), where the many-body electron-phonon interaction problem is mapped exactly into a single-electron multi-channel scattering problem. In particular, the influence of dephasing and relaxation processes on the shape of the electrical current and shot noise curves is discussed in detail under linear and nonlinear transport conditions.