Highly Fluorescent and Color‐Tunable Exciplex Emission from Poly(N‐vinylcarbazole) Film Containing Nanostructured Supramolecular Acceptors |
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| Authors: | Jong H. Kim Byeong‐Kwan An Seong‐Jun Yoon Sang Kyu Park Ji Eon Kwon Chang‐Keun Lim Soo Young Park |
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| Affiliation: | 1. Center for Supramolecular Optoelectronic Materials, Department of Materials Science and Engineering, Seoul National University, Gwanak‐gu, Seoul, South Korea;2. Department of Chemistry, The Catholic University of Korea, Wonmi‐gu, Bucheon‐si, Gyeonggi‐do, South Korea;3. Biomedical Science Center, Korea Institute of Science and Technology, Seongbuk‐gu, Seoul, South Korea |
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| Abstract: | Highly fluorescent excited‐state charge‐transfer complexes (exciplexes) formed at the interfacial region between a polymeric donor matrix, here, poly(N‐vinylcarbazole), and embedded nanostructured acceptors are characterized for their photophysical properties. Exciplex‐to‐exciton emission switching is observed after solvent vapor annealing (SVA) due to the size evolution of the nanostructures beyond the exciton diffusion length. Color‐tunable exiplex emission (sky blue, green, and orange) is demonstrated for three different nanostructured acceptors with the same HOMO–LUMO gap (i.e., the same blue excitonic emission) but with different electron affinity. White‐emitting poly(N‐vinylcarbazole) film is also fabricated, simply by incorporating mixed supramolecular acceptors, which provide independent exciplex emissions. This study presents important insights into the excited‐state intermolecular interaction at the well‐defined nanoscale interface and suggests an efficient way to obtain multicolored exciplex emissions. |
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| Keywords: | exciplexes nanostructured acceptors self‐assembly emission emission switching fluorescence |
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