具有功能化芳基炔基配体的对称和不对称线性反式-双(三丁基膦)Pt(II)双(乙炔)络合物(香豆素制备了萘二甲酰亚胺和苯乙炔化物,它们在可见光区域显示出增强的吸收(在459 nm处的摩尔吸收系数高达76 800 M -1 cm -1),并具有长寿命的三重态激发态(高达139.9μs)。在室温下,萘二甲酰亚胺乙炔-苯基乙炔配合物(Pt-4)显示双重发射(荧光-磷光),而其他配合物仅显示荧光发射。用纳秒时间分辨的瞬态差吸收光谱法和自旋密度表面上的DFT计算研究了配合物的三重激发态。该配合物用作三重态光敏剂,用于比例式O 2感应以及三重态-三重态an灭(TTA)上转换(上转换量子产率高达27.2%)。配合物的TTA上转换需要具有不同T 1状态能级的三重态受体,并已用纳秒时间分辨发射光谱法进行了研究。我们的结果对于设计显示出对可见光的强吸收和长寿命的三重态激发态的新型Pt(II)配合物,以及将这些配合物用作O
AFM and PL spectra revealed their good film-forming properties, high thermal and morphological stability, and good photoluminescence characteristics. The double-layer solution-processed OLEDs (ITO/PEDOT:PSS/EML/BCP/LiF:Al) fabricated using CThnT and CThnCT as the emissive layer and BCP as the electron-transporting and hole-blockinglayer, exhibited stable green to orange electroluminescence (λEL = 536–592
Four new carbazole-based coumarin derivatives comprising a carbazole core and one or two coumarin chromophores, 7-(diethylamino)-3-(4-(9-(p-tolyl)-9H-carbazol-3-yl)phenyl)coumarin (Cz-Ph-C) and 3,3'-((9-(p-tolyl)-9H-carbazole-3,6-diyl)bis(4,4′-phenyl))bis(7- (diethylamino)coumarin) (Cz-2(Ph-C)), 7-(diethylamino)-3-(5-(9-(p-tolyl)-9H-carbazol-3- yl)thiophen-2-yl)coumarin (Cz-Th-C) and 3,3'-((9-(p-t
3-Carboxylic Acid and Formyl-Derived Coumarins as Photoinitiators in Photo-Oxidation or Photo-Reduction Processes for Photopolymerization upon Visible Light: Photocomposite Synthesis and 3D Printing Applications
In this paper, nine organic compounds based on the coumarin scaffold and different substituents were synthesized and used as high-performance photoinitiators for freeradicalphotopolymerization (FRP) of meth(acrylate) functions under visible light irradiation using LED at 405 nm. In fact, these compounds showed a very high initiation capacity and very good polymerization profiles (both high rate of
本文合成了九种基于香豆素骨架和不同取代基的有机化合物,并将其用作高性能光引发剂,用于在405 nm的LED可见光照射下,甲基(丙烯酸)官能团的自由基光聚合(FRP)。实际上,使用基于库姆/碘鎓盐(0.1%/%)的两组分和三组分光引发体系,这些化合物显示出非常高的引发能力和非常好的聚合曲线(高聚合速率(Rp)和最终转化率(FC))。 1%w / w)和coum /碘盐/胺(0.1%/ 1%/ 1%w / w / w), 分别。为了证明引发光聚合反应的效率,使用了多种技术来研究香豆素的光物理和光化学特性,例如:紫外可见吸收光谱法,稳态光解法,实时FTIR和循环伏安法。另一方面,这些化合物也在直接激光写入实验(3D打印)中进行了测试。还检查了使用LED传送带在385 nm(0.7 W / cm 2)下基于玻璃纤维或碳纤维的光复合材料的合成。
Synthesis, characterization, and properties of novel bis(aryl)carbazole-containing N-coumarin derivatives
A series of novel N-coumarin derivatives containing oligothiophene-substituted N-coumarins as the core and bis(aryl)carbazoles as the substituent were synthesized and characterized. Their optical, electrochemical, and thermal properties were investigated. The electroluminescence (EL) properties of the selected materials were also studied. Solution-processed OLEDs with green and yellow light emission, turn-on voltages of 2.7-2.9 V, and maximum luminance efficiencies of up to 3.94 cd A(-1) at 17.6 mA cm(-2) (maximum power efficiency of 1.62 lm W-1) were prepared. (C) 2014 Elsevier Ltd. All rights reserved.
N-coumarin derivatives as hole-transporting emitters for high efficiency solution-processed pure green electroluminescent devices
A series of new N-coumarin dyes containing oligothiophenyl N-coumarins as cores and carbazole dendrons up to the third generation as substituents were synthesized and characterized. Their optical, thermal, electrochemical, and electroluminescent properties as non-doped solution-processed hole-transporting light-emitters for electroluminescent devices were investigated. It was found that by incorporating carbazole dendrons in the molecule, we were able to reduce the crystallization and maintain the high emissive ability of a planar N-coumarin fluorescent core in the solid state as well as improve the thermal stability of the material. These N-coumarins showed a bright green fluorescence and could form morphologically stable amorphous thin films with glass-transition temperatures as high as 299 degrees C. Simple structured solution-processed organic light-emitting diodes using these dyes as emissive layers emitted a stable green electroluminescence (lambda(EL) = 517 nm) with high luminance efficiencies (up to 9.45 cd A(-1) at 6.7 mA cm(-2)) and high green color purity. (C) 2014 Elsevier Ltd. All rights reserved.