Journal
CHEMISTRY OF MATERIALS
Volume 31, Issue 17, Pages 6633-6641Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.9b00601
Keywords
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Funding
- NWO (TOP -PUNT) [10018944]
- Dutch Ministry of Education, Culture, and Science [024.001.035]
- Engineering and Physical Sciences Research Council of the U.K. (EPSRC)
- Marie Sklodowska-Curie postdoctoral fellowship [704830]
- Marie Curie Actions (MSCA) [704830] Funding Source: Marie Curie Actions (MSCA)
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Understanding the molecular level origin of chiroptical properties in enantiopure pi-conjugated polymers is essential for tailoring these materials for application in organic light-emitting diodes and photonic devices. Here we have studied poly(9,9'-dialkylfluorene-alt-2,5-dialkoxyphenyl)s as prototypical copolymers to investigate their structure-chiroptical property relationship. The effect of a systematic variation of the location and configuration (S or R) of chiral and achiral side chains in the repeating units on the liquid crystalline ordering and its relationship to chiroptical properties were investigated. The results clearly indicate that enantiopure side chains on the fluorene units are critical for obtaining the cholesteric liquid crystalline ordering and thereby strong chiroptical properties in both absorption and photoluminescence in annealed thin films. Finally, solution-processed organic light-emitting diodes constructed from a liquid crystalline polymer show strong emission of circularly polarized light, demonstrating the potential application of these systems.
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