The electroluminescence mechanism of non-doping PhOLEDs based on CBP/Ir(ppy)3 investigated by delayed EL measurements

In this paper, the non-doped PhOLED based on 4,4′-bis(9-carbazolyl)-1,1′-biphenyl(CBP) and fac-tris(2-phenylpyridine) iridium(Ir(ppy)₃) with the emitting layer of [CBP/Ir(ppy)₃]_n/CBP in which n is equal to 2,3,4 and 5, respectively, are prepared. The electroluminescence and the luminance-voltage-current density characteristics of devices are detected. The wavelength range of these devices is varied from 517 nm to 540 nm. And the delay EL measurements are used to elucidate the carrier recombination and light emission mechanism in non-doped PhOLEDs. In this technique, the devices are driven using a square pulse driving scheme, with a forward bias pulse width of 1 ms, which is sufficiently long for prompt EL to reach its steady-state intensity. The delay EL results show that changing the number of the non-doped EML leads to marked changes in the charge-trapping and host–host TTA patterns, which suggests that the carrier transport and recombination processes depends on the number of non-doped EML. When the number of non-doped EML is less than 3, only the trapped carrier recombination signal are detected in the delay EL measurement. For the devices with more non-doped EML than 3, both the trapped carrier recombination and host–host TTA signal are detected. All these results are discussed and give the evidence for the electroluminescence mechanism of prepared devices.     

原位反应制备Sm(TTA)3AAphen/NBR复合材料及其荧光性能

合成了具有较高特征Sm^3 荧光强度的Sm(TTA)3AAPhen稀土有机配合物，通过常规聚合物混合方式制备了一系列丁腈橡胶基体（NBR）的复合材料，并进一步使Sm(TTA)3AAphen在NBR中发生原位反应，原位反应前景，复合材料均发射较强的Sm^3 特征荧光，但反应后强度增至2倍，稀土配合物质量分数高达13.0%时都没有出现“荧光猝灭”现象，SEM，TEM结果表明，原位反应后，稀土配合物在NBR中的分散粒径大小减小，部分达到100nm。     

Efficient multimedia coprocessor with enhanced SIMD engines for exploiting ILP and DLP

Multimedia applications have become increasingly important in daily computing. These applications are composed of heterogeneous regions of code mixed with data-level parallelism (DLP) and instruction-level parallelism (ILP). A standard solution for a multimedia coprocessor resembles of single-instruction multiple-data (SIMD) engines into architectures exploiting ILP at compile time, such as very long instruction word (VLIW) and transport triggered architecture (TTA). However, the ILP regions fail to scale with the increased vector length to achieve high performance in the DLP regions. Furthermore, the register-to-register nature of SIMD instructions causes current SIMD engines to have limitations in handling memory alignment, data reorganization, and control flow. Many supporting instructions such as data permutations, address generations, and loop branches, are required to aid in the execution of the real SIMD computation instructions. To mitigate these problems, we propose optimized SIMD engines that have the capabilities for combining VLIW or TTA processing with a unified scalar and long vector computations as well as efficient SIMD hardware for real computation. Our new architecture is based on TTA and is called multimedia coprocessor (MCP). This architecture includes following features: (1) a simple coprocessor structure with 8-way TTA, (2) cost-effective SIMD hardware capable of performing floating-point operations, (3) long vector capabilities built upon existing SIMD hardware and a single register file and processor data path for both scalar operands and vector elements, and (4) an optimized SIMD architecture that addresses the SIMD limitations. Our experimental evaluations show that MCP can outperform conventional SIMD techniques by an average of 39% and 12% in performance for multimedia kernels and applications, respectively.     

适用于楼宇建筑无功补偿和谐波抑制的SVG研制

本文详细介绍了用于智能化楼宇的静止无功发生器(SVG)的研制情况。文中首先简要分析了装置的工作原理，在负载电流检测算法上本文提出了基于三相四线制系统的改进型TTA算法，将之应用于本文所研制的装置中。在主电路拓扑结构上本文采用基于三相四线制的四臂对结构，控制策略上采用基于双DSP控制的数模混合电路，这样有利于提高计算精度。最后给出了实验和现场运行的结果。结果表明，将该算法运用于本文所研制的装置中，其不但具有良好的无功补偿能力，并且能够很好地补偿谐波和抑制不平衡电流，中线电流也基本能够消除。该装置运行稳定，补偿方式较为灵活，具有很高的现实意义。     

载流子传输材料对双层器件电致发光特性影响

以新的稀土红色荧光络合物－－Eu(TTA)m复合体系作为发光层,用不同载流子传输材料充当电子传输层做成双层器件,研究了双层器件的电致发光特性。对于空穴传输材料,高场下器件的电流表现为体内电阻限制;而对于电子传输材料,咖啡 件的电流表现为电极限制。从光谱的变化,可明显看出电场对复合区域的影响。     

协同萃取规律的研究 Ⅷ.AAB类三元体系(TTA+PMBP+TOPO)协萃硝酸铀酰研究

本文研究铀(Ⅵ)的三元协萃规律。AAB类是在研究了ABC类(PMBP+TBP+(C_6H_5)_4AsCl)、(TTA+DBSO+(C_6H_5)_4AsCl),ABB类(PMBP+TBP+DPSO)、(HTTA+TBP+DPSO)分别从硫氰酸和硝酸底液萃取U(Ⅵ)基础上,新找到的三元协萃体系。本文报道α-噻吩甲酰三氟丙酮(TTA)与1-苯基3-甲基4-苯甲酰基吡唑啉酮-5(PMBP)、三辛基氧化膦(TOPO)的氯仿溶液,萃取硝酸铀酰的协萃效应。用斜率法确定了二元及三元协萃络合物的组成UO_2(TTA)_2·TOPO、UO_2(PMBP)_2·TOPO、UO_2(TTA)(PMBP)·TOPO,分别求得其协萃反应平衡常数的平均值为1gβA_1B=3.85(TTA+TOPO);1gβA_2B=5.29(PMBP+TOPO);1gβA_1A_2B=4.87(TTA+PMBP+TOPO)。并用锥角模型计算了配位体的立体角系数和,确定了协萃络合物的空间堆积程度。     

Syntheses and Characterization of Binuclear Complexes Tb（1-x）Eux（TTA）3 Phen

Rare earth ternary complexes Tb1-xEux（TTA）3Phen（x=0,0.25,0.5,0.75,1.0）were synthesized and characterized by DTA-TG,XRD and infrared（IR）.The photophysical properties of these complexes were studied in detail using ultraviolet absorption spectra and fluorescent spectra.Ultraviolet absorption showed that the energy absorption of the complexes mostly came from ligands.Infrared spectra of Tb1-xEux（TTA）3Phen complexes were similar to the pure complexes.TG curves proved that the complexes were stable.Tb3＋ emission was almost quenched and the Eu3＋ emission was enhanced by codoping the complexes.The Tb3＋ ion acted as an energy transfer bridge that helped energy transfer from poly（N-vinylcar-bazole（PVK）to Eu3＋.In addition,their PL and EL properties were systematically studied.     

Influence of the support base on the sorption of Co(II) with mixed solvents

Theonyltrifluoroacetone (TTA) mixed with trioctyl phosphine oxide (TOPO) have been supported on Amberlite XAD-4, silica gel and wood powder. The resulting resins have been used to study the sorption of cobalt(II) from acetate buffer and their sorption capacities were determined and were found to be 12.38, 11.61 and 6.51 mg g(-1) for TTA+TOPO/Amberlite XAD4, TTA+TOPO/silica gel and TTA+TOPO/wood, respectively. The experimental results showed that the sorption of Co(II) increases with its initial concentration. The results can be fitted by Freundlich isotherm in the studied cobalt concentration range [10(-4)-10(-3) M] and 1/n values are 1.07, 1.17 and 1.73 for Amberlite XAD4, silica gel and wood powder, respectively. The sorption of Co(II) onto the prepared resins was found to follow the pseudo-second order model and the sorption rate have the values 8.79x10(-3), 10x10(-3) and 16x10(-3) g mg(-1)min(-1) for Amberlite XAD4, silica gel and wood powder, respectively. Thermodynamic parameters have also been calculated for the three systems and sorption process was found to be spontaneous and endothermic one.