期刊
ACS NANO
卷 10, 期 5, 页码 5543-5549出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.6b02100
关键词
conjugated polymer; polymer blend; microsphere; energy transfer; whispering gallery mode
类别
资金
- JSPS/MEXT Japan [25708020, 15K13812, 15H00986, 15H00860]
- Industrial Technology Research Grant Program from NEDO Japan
- Asahi Glass Foundation
- University of Tsukuba-DAAD partnership program
- Grants-in-Aid for Scientific Research [25708020, 15K13812, 15KK0182, 15H00986, 16J00960, 16H02081, 15H00860] Funding Source: KAKEN
Highly luminescent x-conjugated polymeric micro spheres 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 opto electronic and photonic device applications.
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