Chochos Christos L, Kallitsis Joannis K, Gregoriou Vasilis G
Foundation for Research and Technology Hellas, Institute of Chemical Engineering and High-Temperature Processes (FORTH-ICEHT), P.O. Box 1414, Patras 26500, Greece.
J Phys Chem B. 2005 May 12;109(18):8755-60. doi: 10.1021/jp044202j.
Spectroscopic studies on a series of rod-coil block copolymers with terfluorene as the rigid segment demonstrate that the main cause of color instability in fluorene oligomers and polymers is aggregate and/or excimer formation and not the presence alone of keto defects (fluorenone formation) along the molecular chain. Keto defects, when present, contribute to the appearance of the undesirable "green" emission band but are not the leading cause of color instability. Thus, the synthesis of materials where aggregation and/or interchain, intersegment interactions are inhibited is the key approach for the production of stable polymeric light-emitting devices (PLED's). The potential of this method is verified by the synthesis of photooxidative stable fluorene/styrene diblock copolymer blue emitters.
对一系列以对三联苯为刚性链段的棒-线团嵌段共聚物的光谱研究表明，芴低聚物和聚合物中颜色不稳定的主要原因是聚集体和/或准分子的形成，而不仅仅是分子链上酮缺陷（芴酮形成）的存在。酮缺陷存在时，会导致出现不良的“绿色”发射带，但不是颜色不稳定的主要原因。因此，抑制聚集和/或链间、链段间相互作用的材料合成是生产稳定聚合物发光器件（PLED）的关键方法。通过合成光氧化稳定的芴/苯乙烯二嵌段共聚物蓝色发射体，验证了该方法的潜力。
