This work presents a fast purification system that involves a vertical quartz tube and vacuum sublimation for separation without dilution. This system produced re‐crystallized 1,4‐di(pyren‐1‐yl)benzene (DPB) in a few hours following the synthesis of pyrene derivatives with a mole yield ratio of 1,4‐di(pyrene‐1‐yl)benzene to 1‐phenylpyrene (1PP) of 5:1. Differential scanning calorimetry (DSC) and X‐ray
Blue Emitters Based on Aryl End-Capped Pyrene Groups for OLEDs
作者:C. W. Kim、S. N. Park、S. B. Lee、J. J. Kim、H. W. Lee、Y. K. Kim、S. S. Yoon
DOI:10.1166/jnn.2016.11092
日期:2016.3.1
We have synthesized four pyrene-derived blue emitting materials using Suzuki cross coupling reactions. All OLED devices using these materials as emitting materials showed efficient blue electroluminescence (EL). Particularly, a device using 1,1′-(9,9-dimethyl-9H-fluorene-2,7-diyl)bis-pyrene (1) showed best EL properties with the luminous efficiency of 4.32 cd/A, the power efficiency of 3.98 lm/W and the external quantum efficiency of 2.48% at 500 cd/m2.
light. The proposed compounds can behave as new photocatalysts. Successful results in terms of rates of polymerization and final conversions were obtained. The strong MO coupling between the six different cores and the pyrene moiety was studied by DFT calculations. The different chemical intermediates are characterized by ESR and laser flash photolysis experiments. The mechanisms involved in the initiation
合成了 11 种基于核芘 pi 结构 (Co_Py) 的双和三官能化合物,并研究了自由基的形成。详细研究了二组分和三组分光引发体系(不同的 Co_Pys,添加碘盐或锍盐、卤代烷或胺)在近紫外可见光下的阳离子和自由基光聚合反应中的应用。所提出的化合物可以充当新的光催化剂。获得了聚合速率和最终转化率方面的成功结果。通过 DFT 计算研究了六个不同核与芘部分之间的强 MO 耦合。不同的化学中间体通过 ESR 和激光闪光光解实验进行表征。讨论了启动步骤中涉及的机制,