Efficient and Saturated Red Light-Emitting Electrochemical Cells Based on Cationic Iridium(III) Complexes with EQE up to 9.4 %

Solid-state light-emitting electrochemical cells (LECs) have several advantages, such as low-voltage operation, compatibility with inert metal electrodes, large-area flexible substrates, and simple solution-processable device architectures. However, most of the studies on saturated red LECs show low or moderate device efficiencies (external quantum efficiency (EQE) <3.3 %). In this work, we demonstrate a series of five red-emitting cationic iridium complexes ( RED1- - RED5 ) with 2,2′-biquinoline ligands and test their electroluminescence (EL) characteristics in LECs. The Commission Internationale de l′Eclairage (CIE) 1931 coordinates for the LECs based on these complexes are all beyond the National Television System Committee (NTSC) red standard point (0.67, 0.33). The maximal EQE of the neat-film RED1 -based LECs reaches 7.4 %. The reddest complex, RED3 , is doped in the blue-emitting host complex, BG , to fabricate host–guest LECs. The maximal EQE of the host–guest LECs (1 wt % complex RED3 ) reaches 9.4 %, which is among the highest reported for the saturated red LECs.     

一个半参数回归模型中Cramér渐近有效性的充要条件(英语)

本文考虑模型Y_i=X~Tβ g(T) ε,这里(X~T,T,Y,)是k 2-维随机向量,g是未知光滑函数,ε是均值为零方差有限的随机误差。本文证明了,的最小二乘估计是Cramer渐近有效的充要条件是误差6服从正态分布N(0,口’)。     

以氮气为载气COIL的设计与实验

 根据以氮气为载气的特殊要求，对kW级氧碘化学激光器（COIL）装置的结构进行了有针对性的设计和实验研究。在氯气流量为140mol/s的情况下, 获得了2.6kW的功率, 相应的化学效率为20.4%, 喷管出口能流密度达到了74W/cm²。这一结果达到了以氦气为载气COIL的水平。     

Ni-Mn粉末触媒中固溶碳的作用效果和机理初探

 在国产DS6×800A型六面顶压机上，对比研究了含与不含固溶碳的Ni-Mn粉末触媒，采用直热式静压触媒法合成金刚石的差异。实验表明：Ni-Mn粉末触媒中固溶碳的存在，不仅可以提高金刚石的合成单产、细化金刚石晶粒，而且在同工艺条件下，能得到晶形完整度较高的金刚石单晶。     

The diversity of the physics of earthquakes

Earthquakes exhibit diverse characteristics. Most shallow earthquakes are “brittle” in the sense that they excite seismic waves efficiently. However, some earthquakes are slow, as characterized by tsunami earthquakes and even slower events without any obvious seismic radiation. Also, some earthquakes, like the 1994 Bolivian deep earthquake, involved a large amount of fracture and thermal energy and may be more appropriately called a thermal event, rather than an earthquake. Some earthquakes are caused by processes other than faulting, such as landslides. This diversity can be best understood in terms of the difference in the partition of the released potential energy to radiated, fracture, and thermal energies during an earthquake. This approach requires detailed studies on quantification of earthquakes and estimation of various kinds of energies involved in earthquake processes. This paper reviews the progress in this field from historical and personal points of view and discusses its implications for earthquake damage mitigation.     

红外InGaAsP光电阴极研究

本文主要对阈值波长可达1.25μm的InGaAsP光电阴极进行了详细的研究。在国内首次实现了在0.5μm～1.25μm波段范围内具有光电响应的半导体光电阴极。用Cs和O₂激活后得到的光电阴极在1.06μm处的反射式光电灵敏度为3.4mA/W,量子效率为0.4%。本文还对激活表面及热清洁工艺进行了系统地分析,确定出了最佳的表面清洁温度及时间。     

Computing the bump number is easy

The bump number b(P) of a partial order P is the minimum number of comparable adjacent pairs in some linear extension of P. It has an interesting application in the context of linear circuit layout problems. Its determination is equivalent to maximizing the number of jumps in some linear extension of P, for which the corresponding minimization problem (the jump number problem) is known to be NP-hard. We derive a polynomial algorithm for determining b(P). The proof of its correctness is based on a min-max theorem involving simple-structured series-parallel partial orders contained in P. This approach also leads to a characterization of all minimal partial orders (with respect to inclusion of the order relations) with fixed bump number.Supported by Sonderforschungsbereich 303 of the University of Bonn.Supported by DAAD and SSHRC, Grant No. 451861295.     

参数与非参数前沿方法在生产率效率测度中的应用

参数和非参数前沿方法是测度生产率效率的两种重要方法,本文构建了一个将二者结合起来的研究框架。在此基础上,以我国30个省份的第一产业为例,对各省份的农业生产率效率进行了测度和比较。虽然两种方法各有优缺点,但结合使用不仅能提高各自的准确度,也能优化各决策单元的投入与产出比例,同时也是进一步经济计量分析的一个重要参照系。     

FIR Laser Efficiency Enhancement by Double Resonance Tuning-Detailed Analysis

In a previous paper by the author (Ref. 1), FIR laser resonators with aperture coupling were shown to have resonance effect at the frequency that could be used to enhance the efficiency of the laser. This paper studies this effect over a wide range of laser parameters such as coupling aperture, cavity length and Fresnel Number. A set of curves are given to help a FIR laser designer optimize the laser.     

基于发光机理提高掺铒硅基材料发光效率的几条途径

掺铒硅基发光材料可以用于制备光通信用光源、光纤放大器，更重要的是可能成为实现硅基光电子集成技术的重要途径，已成为研究的热点之一．文章讨论了掺铒硅及掺铒硅基材料的发光机理，指出了制约实用化方面存在的问题．从不同方面着重探讨了共掺氧对提高掺铒硅发光效率的作用．最后介绍了基于掺铒硅发光机理提高掺铒硅基材料发光效率的几种途径、目前存在的主要问题及研究进展．