Remarkable White Circularly Polarized Electroluminescence Based on Chiral Co-assembled Helix Nanofiber Emitters

White circularly polarized organic light-emitting diodes (CP-WOLEDs) are of great significance in potential lighting sources and full-color 3D displays. However, High-performance white CP-EL sources are almost unexplored. We have constructed full-color CP-EL devices based on chiral co-assemblies by using three achiral conjugated pyrene-based dyes (BP, w-WP and c-WP) doped with chiral binaphthyl-based enantiomers (S-/R-M) as the EMLs through an intermolecular chirality induction mechanism. (S-/R-M)_0.2-(c-WP)_0.8 films exhibit regular helix nanofibers under annealing treatment and emit strong white CPL. Significantly, remarkable CP-WOLEDs based on (S-/R-M)_0.2-(c-WP)_0.8 were achieved with |g_EL| values as high as 6.2×10⁻² and an excellent CRI of 98 at the CIE coordinates of (0.33, 0.33). These are the highest g_EL and CRI values of reported CP-WOLEDs to date. This is the first achievement of CP-WOLEDs based on chiral co-assembled helix nanofiber emitters, and provides a valuable strategy with which to develop white CP-EL for future practical applications.     

镧对土壤微生物的影响

通过南非马唐盆栽试验研究了La对红壤-牧草系统中土壤微生物的剂量效应和时间效应. 结果表明,高浓度La对土壤细菌、放线菌、 真菌和自生固氮菌均有毒害作用,而且土壤细菌、放线菌和自生固氮菌对La的敏感性均大于真菌. 对La浓度-土壤微生物数量的生物学参数模拟的计算结果表明,La对土壤细菌、放线菌以及真菌的EC50(半效应浓度)值随时间延长而增加,说明随着时间的延长,La对土壤微生物的影响具有减弱的趋势.     

Modelling Imbibition Processes in Heterogeneous Porous Media

Transport in Porous Media - Imbibition is a commonly encountered multiphase problem in various fields, and exact prediction of imbibition processes is a key issue for better understanding capillary...     

Solution-Processed White Circularly Polarized Organic Light-Emitting Diodes Based on Chiral Binaphthyl Emitters

By combining the blue and orange CPL or functionalized bis-benzoxanethones emitters (S-/R- BN-tCz and S-/R- BN-PXZ ), warm white CP-OLEDs were fabricated using solution-processed single emitting layer strategy. The successful realization of white CP-EL benefited from the same stable binaphthyl chirality and similar rigid structure of the two emissive CPL emitters. The devices exhibited the low turn-on voltage of ≈4.3 V, maximum luminance of ≈10200 cd m⁻² and maximum current efficiency of ≈2.0 cd A⁻¹. Most significantly, the devices with CIE coordinates of (0.32, 0.45) displayed intense CP-EL signals in the spectral range of 450 to 650 nm, and showed stable g_EL values of ≈10⁻³ as the luminance increased from 100 to 6000 cd m⁻². To the best of our knowledge, this work provides for the first time a simple and feasible strategy to fabricate solution-processed white CP-OLEDs based on the co-doping of the CPL emitters.     

Investigation of CO2 Splitting Process Under Atmospheric Pressure Using Multi-electrode Cylindrical DBD Plasma Reactor

Plasma Chemistry and Plasma Processing - In this paper, the CO2 splitting process was performed under atmospheric pressure in a multi-electrode cylindrical dielectric barrier discharge (DBD) plasma...     

K2O-Fe2O3系催化剂的穆斯堡尔谱研究

利用穆斯堡尔谱在K2 O Fe2 O3催化剂中检出了α Fe2 O3(大晶粒及微晶 )、KFeO2 、K1 XFe11O17、α FeOOH和γ FeOOH等物相 ,它们的相对含量取决于催化剂的含钾量及煅烧温度 ,相对含量的改变导致样品的穆斯堡尔谱图出现了复杂的变化 .与XRD相比 ,穆斯堡尔谱可对钾与氧化铁的相互作用进行更有效的表征 ,穆斯堡尔谱和TPR研究都表明钾可延缓催化剂中Fe(III)的被还原 .     

The stereoselective synthesis of β‐haloenol phosphates—A reinvestigation of the reaction of α‐haloketones with diethyl phosphite

A new pathway for the reaction involving an α‐haloketone and a dialkyl phosphite has been suggested, It offers a highly stereoselective synthetic procedure leading to β‐haloenol phosphates in one‐pot reactions that take place in good yields. However, normal Pudovik reaction products were formed when the reaction was carried out using a relatively small amount of base. © 1999 John Wiley & Sons, Inc. Heteroatom Chem 10: 55–59, 1999     

控制卷积量变化的电化学方法研究(Ⅰ)——简单电极反应

本文提出了一种控制卷积量变化的实验方法。对简单电极反应进行了理论处理,得到了恒半积分法、半积分扫描法、半微分扫描法的理论方程,并对3个体系进行了实验验证,结果与理论分析基本吻合。     

恒电位库仑法研究硫在有机溶剂中的还原过程

实验证明,第1步还原E_(1/2)=-0.96V(文中所有的电位均相对于Ag参比电极);第2步E_(1/2)=-1.56V。该体系的特征是伴随的均相反应具有较低的速率常数,在一般的循环伏安法扫描时间内很难觉察到均相反应的进行。若采取时间窗较长的实验方法,将有利于观察伴随均相反应的动力学效应。恒电位库仑法时间域约为100～