Conjugated Polymer Blend Microspheres for Efficient, Long-Range Light Energy Transfer

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• 作者：Soh Kushida ; Daniel Braam ; Thang Duy Dao ; Hitoshi Saito ; Kosuke Shibasaki ; Satoshi Ishii ; Tadaaki Nagao ; Akinori Saeki ; Junpei Kuwabara ; Takaki Kanbara ; Masashi Kijima ; Axel Lorke ; Yohei Yamamoto
• 刊名：ACS Nano
• 出版年：2016
• 出版时间：May 24, 2016
• 年：2016
• 卷：10
• 期：5
• 页码：5543-5549
• 全文大小：433K
• 年卷期：0
• ISSN：1936-086X

文摘

Highly luminescent π-conjugated polymeric microspheres were fabricated through self-assembly of energy-donating and energy-accepting polymers and their blends. To avoid macroscopic phase separation, the nucleation time and growth rate of each polymer in the solution were properly adjusted. Photoluminescence (PL) studies showed that efficient donor-to-acceptor energy transfer takes place inside the microspheres, revealing that two polymers are well-blended in the microspheres. Focused laser irradiation of a single microsphere excites whispering gallery modes (WGMs), where PL generated inside the sphere is confined and resonates. The wavelengths of the PL lines are finely tuned by changing the blending ratio, accompanying the systematic yellow-to-red color change. Furthermore, when several microspheres are coupled linearly, the confined PL propagates the microspheres through the contact point, and a cascade-like process converts the PL color while maintaining the WGM characteristics. The self-assembly strategy for the formation of polymeric nano- to microstructures with highly miscible polymer blends will be advantageous for optoelectronic and photonic device applications.