Traps as interaction sites for hyperfine mixing: The origin of magnetoconductance in organic light-emitting diodes

The origin of magnetoconductance (MC) in organic light-emitting diodes under bipolar injection conditions was investigated using devices containing pristine Super-Yellow poly(phenylene vinylene) (SY-PPV) or SY-PPV:phenyl-C61-butyric acid methyl ester (PCBM) (x wt%) blends as the active layers. In pristine SY-PPV device, it was found that the low-field component of MC was always larger than the high-field component. Additionally, the low-field component increased and then saturated with increasing the electrical stressing time, whereas the high-field component remained unchanged. These behaviors were analyzed using empirical formula (containing a Lorentzian and a non-Lorentzian function), which suggested that the dominant mechanism in the MC response was hyperfine mixing between single and triplet polaron pairs that occurred on trap sites. The specific role of these traps, providing interaction sites for hyperfine mixing, was confirmed by controlling the lifetime of the trapped polaron-pairs states by doping the active layer with PCBM.     

Improving the fill factor of N2200-based all polymer solar cells by introducing EPPDI as a solid additive

A cheap and commercially available small molecule (namely EPPDI) is introduced to the active layer of N2200-based all polymer solar cells as a solid additive. EPPDI at the optimal ratio can improve the D-A nano-scale morphology and reduce trap density of the active layer by filling morphological spaces. As a result, the photovoltaic performance of the resulting devices based on PF2:N2200 are increased from 6.28% to 7.03% with significantly enhanced fill factor. This work demonstrates a facile approach for improving the performance of all polymer solar cells.     

Electrical and optical analyses of trapping phenomenon with temperature dependence of organic device

Carrier mechanism in actual organic devices is not simple, owing to the dielectric nature of active organic semiconductor layers, the complexity of the organic device interface, carrier trapping effects by stress biasing, and others. By coupling the conventional electrical measurement, e.g., current–voltage, capacitance–voltage and capacitance-frequency measurements, with optical charge modulation spectroscopy (CMS) measurement, we studied the hysteresis behavior and the temperature dependence of indium tin oxide/polyimide/6,13-Bis(triisopropylsilylethynyl)pentacene(TIPS-pentacene)/Au diodes to understand the effect of carrier trapping caused by injected carriers. The coupled electrical and optical measurements were very helpful to clarify carrier injection that was followed by carrier trapping in the diode, in terms of hysteresis behavior. CMS measurement was used to observe energetic states of carriers in TIPS-pentacene double-layer diode. Finally, the carrier mechanism in organic diodes was discussed by analyzing the diodes as a Maxwell-Wagner effect element.     

分层分布式网络故障监视算法研究

网络管理首先要有效地获得监视信息,现有的简单网络管理协议(SNMP)网络管理方式中,一般采用管理者轮询代理以及代理主动向管理者报告事件通知的方法监视网络,它们都占用较多的网络带宽和系统资源。为了减少网络监视带来的开销,该文基于分层分布式网络管理体系结构,提出了一种动态网络监视算法。算法根据轮询和事件通知获得的网络状态数据,预测发生告警的可能性。如果没有告警的可能性,则延时轮询,同时采用告警滞后机制过滤冗余告警信息,保证了既不漏报告警,又有效地降低了网络管理的通信负担。仿真结果表明,该文的监视算法有效地减少了轮询次数,过滤了重复告警信息,降低了管理信息占用的带宽,提高了网络管理的有效性。     

白厚漆中挥发性有机物的吹扫捕集/气相色谱-质谱分析方法研究

采用吹扫捕集/气相色谱-质谱法(PT/GC-MS)建立了白厚漆中挥发性有机物的快速分析方法。在优化吹扫捕集和气相色谱-质谱参数的基础上,在白厚漆中共鉴别出34个挥发性有机物成分。该方法简便、快捷、灵敏,适用于白厚漆中挥发性有机物的分析,并为白厚漆对水质和环境的影响研究提供理论依据。     

通道式辐射计的相对光谱响应率定标

为配合气象卫星的在轨辐射定标,利用自行设计的宽光谱辐射定标系统配合高精度陷阱探测器,采用光谱替代法为试验中所需的可见、近红外辐射计和近红外、短波红外辐射计进行了高精度相对光谱响应率定标.详细叙述和分析了定标过程以及影响测量结果的不确定度源,其最终合成不确定度为3.21×10-3,满足了定标精度要求.     

涟源坳陷中部构造带勘探潜力分析

裸露海相地层的勘探潜力一直是石油地质工作者所关心的问题。从涟源坳陷中部构造带基底性质、沉积盖层演化等方面入手,分析了各构造运动时期的应力性质,重点分析了中部构造带的构造样式及其形成机理,指出中部构造带的构造样式是盖层滑脱型,其关键构造要素是犁式叠瓦状逆冲断层和倾向腹地式的双冲断层系,构造变形主要发育于印支期,定型于燕山早-中期。结合烃源岩特征、资源潜力、储层盖层条件、埋藏情况等,查明了主要的生烃时期。通过分析油气运移与构造圈闭形成之间的配套关系,指出了勘探方向。     

塔里木盆地寒武—奥陶系石油地质特征

塔里木盆地是在古生代地台基础上发展起来的中──新生代叠合型含油气盆地。由于盆地长期处于相对稳定的大地构造环境，这就为油气的生成、聚集、保存提供了有利的地质条件。从盆地内发现的多处地面油气显示和目前钻井获得的高产油气流，都证实了塔里木盆地的油气资源是非常丰富的。特别是在盆地内发现的多套生油层系中，寒武──奥陶系为最佳。为此，本文就从寒武──奥陶系的石油地质特征入手，来探讨油气的分布规律。     

Windows环境下SNMP Trap的研究

随着计算机网络技术的发展，网络管理成了不可或缺的重要组成部分，尽管有关网络管理方面的文章很多，但有关SNMP陷阱（Trap)技术应用的文章甚少，探讨了Windows环境下陷阱的编程技术和实现方法，对于网络管理应用的开发具有一定的参考意义。     

对南方海相碳酸盐岩区勘探的思考

回顾、总结南方海相碳酸盐岩区４０余年的勘探历程、失利原因,借鉴四川盆地勘探经验教训,并结合该区具体构造演化过程,提出评价、成选下步勘探目标的途径和具体操作方法。研究表明区域盖层、古隆起、后期保存条件匹配良好的构造单元是下步有利的勘探目标。