Das Paramita, Kumar Atul, Chowdhury Aniket, Mukherjee Partha Sarathi
Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560012, India.
Department of Chemistry, Asutosh College, 92, S. P. Mukherjee Road, Kolkata 700026, India.
ACS Omega. 2018 Oct 22;3(10):13757-13771. doi: 10.1021/acsomega.8b01706. eCollection 2018 Oct 31.
Two new star-shaped phenyl- and triazine-core based donor-acceptor (D-A) type conjugated molecules bearing triphenylamine end-capped arms were synthesized and characterized as imminent organic optoelectronic materials. Photophysical properties of the compounds were explored systematically via spectroscopic and theoretical methods. Because of the presence of donor-acceptor interactions, these luminogens display multifunctional properties, for instance, high extinction coefficient, large stokes shift, and pronounced solvatochromic effect. The compounds also exhibited phenomenon known as aggregation-induced emission on formation of nano-aggregates in the tetrahydrofuran-water mixture. The aggregate formation was confirmed by transmission electron microscopy, scanning electron microscopy, and dynamic light scattering analyses. Moreover, by controlling the electron withdrawing ability of the acceptor, complementary emissive fluorophores (blue and yellow) were achieved. These two complementary colors together span the entire range of visible spectrum (400-800 nm) and therefore when mixed in a requisite proportion generate white light in solution phase. These findings have potential for the progress of new organic white light radiating materials for applications in lighting and display devices.
合成了两种带有三苯胺封端臂的新型星形苯基和三嗪核供体-受体（D-A）型共轭分子，并将其表征为有前途的有机光电子材料。通过光谱和理论方法系统地研究了这些化合物的光物理性质。由于存在供体-受体相互作用，这些发光体表现出多功能性质，例如高消光系数、大斯托克斯位移和明显的溶剂化显色效应。这些化合物在四氢呋喃-水混合物中形成纳米聚集体时还表现出聚集诱导发光现象。通过透射电子显微镜、扫描电子显微镜和动态光散射分析证实了聚集体的形成。此外，通过控制受体的吸电子能力，获得了互补发射荧光团（蓝色和黄色）。这两种互补颜色共同覆盖了整个可见光谱范围（400-800nm），因此当以所需比例混合时，在溶液相中产生白光。这些发现对于开发用于照明和显示设备的新型有机白光辐射材料具有潜在意义。
