Tuning the Solid State Emission of Thin Films/Microspheres Obtained from Alternating Oligo(3-octylthiophenes) and 2,6-Bis(pyrazole)pyridine Copolymers by Varying Conjugation Length and Eu3+

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• 作者：Yemineni S. L. V. Narayana ; Martin Baumgarten ; Klaus M眉llen ; Rajadurai Chandrasekar
• 刊名：Macromolecules
• 出版年：2015
• 出版时间：July 28, 2015
• 年：2015
• 卷：48
• 期：14
• 页码：4801-4812
• 全文大小：936K
• ISSN：1520-5835

文摘

A series of dialkynyl-functionalized oligo(3-octylthiophene)_m (m = 1鈥? and 9, where m is the number of thiophene units) were polymerized together with 2,6-bis(pyrazole)pyridine (BPP) to get alternating copolymers (P1鈥?b>P7 and P9) with the number-average molecular weights (M_n) in the range of 5.3鈥?1 kDa. These copolymers were further self-assembled into solid microspheres. The optical emission range of these copolymers were fine-tuned from blue to red and white by changing the conjugation length of thiophene oligomers (band gap approximately from 2.1 to 1.67 eV) and coordination of metals like Eu³⁺ and Tb³⁺ in both the solution and solid states. A white color was obtained in solution, thin film, and microsphere states with CIE (Commission Internationale de l鈥橢clairage) coordinates close to the values of standard white color.