Triphenylamine-Derived Solid-State Emissive Carbon Dots for Multicolor High-Efficiency Electroluminescent Light-Emitting Diodes

Two kinds of triphenylamine-derived solid-state emissive carbon dots (CDs) with orange and yellow color are facilely synthesized through solvothermal treatment, taking advantage of the nonplanar structure and good carrier mobility of triphenylamine unit. Theoretical calculations show that the triphenylamine structure could greatly inhibit the direct π–π stacking of aromatic skeletons and enhance the fluorescence properties of CDs in aggregation state. By adopting the CDs as single emissive layer, high-performance orange-color and green-color electroluminescent light-emitting diodes (LEDs) are successfully fabricated, with maximum brightness of 9450/4236 cd m⁻², high current efficiency of 1.57/2.34 cd A⁻¹ and low turn-on voltage of 3.1/3.6 eV are respectively achieved. Significantly, white-color LED device is further prepared. This work provides a universal platform for the construction of novel solid-state emissive CDs with significant applications in photoelectric device.     

Oxidation of 3-Oxo-N-Confused Porphyrin with PIFA: Inner and meso Functionalizations

Conjugate addition of ethanol and subsequent oxidation with [bis (trifluoroacetoxy)iodo]benzene (PIFA) allowed for the inner ethoxylation of 3-oxo-N-confused tetraphenylporphyrin ( ONCP ). First oxidation of ONCP with PIFA followed by treatment with ethanol gave two more N-confused phlorins derivatives 5 and 6 .     

电流变“Smart”轴承动态特性分析

本文采用作者提出的二次规划法为基础的双线性流变有限元方法分析了电流变“Ｓｍａｒｔ”轴承的动态特性,给出了在不同偏心率下轴承油膜八项动态特性系数随电压改变的曲线。通过对轴承－转子系统的稳定性分析,发现若加大油膜电压将会提高轴承的稳定性