All-or-none switching of photon upconversion in self-assembled organogel systems

Pengfei Duan; Deepak Asthana; Takuya Nakashima; Tsuyoshi Kawai; Nobuhiro Yanai; Nobuo Kimizuka

doi:10.1039/c6fd00170j

All-or-none switching of photon upconversion in self-assembled organogel systems

Pengfei Duan, Deepak Asthana, Takuya Nakashima, Tsuyoshi Kawai, Nobuhiro Yanai, Nobuo Kimizuka

Research output: Contribution to journal › Article › peer-review

20 Citations (Scopus)

Abstract

Aggregation-induced photon upconversion (iPUC) based on a triplet-triplet annihilation (TTA) process is successfully developed via controlled self-assembly of donor-acceptor pairs in organogel nanoassemblies. Although segregation of donor from acceptor assemblies has been an outstanding problem in TTA-based UC and iPUC, we resolved this issue by modifying both the triplet donor and aggregation induced emission (AIE)-type acceptor with glutamate-based self-assembling moieties. These donors and acceptors co-assemble to form organogels without segregation. Interestingly, these donor-acceptor binary gels show upconversion at room temperature but the upconversion phenomena were lost upon dissolution of the gels on heating. The observed changes in TTA-UC emission were thermally reversible, reflecting the controlled assembly/disassembly of the binary molecular systems. The observed on/off ratio of UC emission was much higher than that of the aggregation-induced fluorescence of the acceptor, which highlights the important role of iPUC, i.e., multi-exciton TTA for photoluminescence switching. This work bridges iPUC and supramolecular chemistry and provides a new strategy for designing stimuli-responsive upconversion systems.

Original language	English
Pages (from-to)	305-316
Number of pages	12
Journal	Faraday Discussions
Volume	196
DOIs	https://doi.org/10.1039/c6fd00170j
Publication status	Published - 2017

All Science Journal Classification (ASJC) codes

Physical and Theoretical Chemistry

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10.1039/c6fd00170j

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title = "All-or-none switching of photon upconversion in self-assembled organogel systems",

abstract = "Aggregation-induced photon upconversion (iPUC) based on a triplet-triplet annihilation (TTA) process is successfully developed via controlled self-assembly of donor-acceptor pairs in organogel nanoassemblies. Although segregation of donor from acceptor assemblies has been an outstanding problem in TTA-based UC and iPUC, we resolved this issue by modifying both the triplet donor and aggregation induced emission (AIE)-type acceptor with glutamate-based self-assembling moieties. These donors and acceptors co-assemble to form organogels without segregation. Interestingly, these donor-acceptor binary gels show upconversion at room temperature but the upconversion phenomena were lost upon dissolution of the gels on heating. The observed changes in TTA-UC emission were thermally reversible, reflecting the controlled assembly/disassembly of the binary molecular systems. The observed on/off ratio of UC emission was much higher than that of the aggregation-induced fluorescence of the acceptor, which highlights the important role of iPUC, i.e., multi-exciton TTA for photoluminescence switching. This work bridges iPUC and supramolecular chemistry and provides a new strategy for designing stimuli-responsive upconversion systems.",

author = "Pengfei Duan and Deepak Asthana and Takuya Nakashima and Tsuyoshi Kawai and Nobuhiro Yanai and Nobuo Kimizuka",

note = "Funding Information: This work was partly supported by a Grant-in-Aid for Scientific Research (S) (25220805), a Grant-in-Aid for Scientific Research on Innovative Area (16H00844) from the Ministry of Education, Culture, Sports, Science and Technology of Japan, the JSPS-NSF International Collaborations in Chemistry (ICC) program, and the Asahi Glass Foundation. P.D. acknowledges the research fund supported by National Center for Nanoscience and Technology and Chinese Academy of Sciences, the National Basic Research Program of China (2016YFA0203400), National Natural Science Foundation of China (5167030613). Publisher Copyright: {\textcopyright} The Royal Society of Chemistry 2017.",

year = "2017",

doi = "10.1039/c6fd00170j",

language = "English",

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journal = "Faraday Discussions",

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AU - Duan, Pengfei

AU - Asthana, Deepak

AU - Nakashima, Takuya

AU - Kawai, Tsuyoshi

AU - Yanai, Nobuhiro

AU - Kimizuka, Nobuo

N1 - Funding Information: This work was partly supported by a Grant-in-Aid for Scientific Research (S) (25220805), a Grant-in-Aid for Scientific Research on Innovative Area (16H00844) from the Ministry of Education, Culture, Sports, Science and Technology of Japan, the JSPS-NSF International Collaborations in Chemistry (ICC) program, and the Asahi Glass Foundation. P.D. acknowledges the research fund supported by National Center for Nanoscience and Technology and Chinese Academy of Sciences, the National Basic Research Program of China (2016YFA0203400), National Natural Science Foundation of China (5167030613). Publisher Copyright: © The Royal Society of Chemistry 2017.

PY - 2017

Y1 - 2017

N2 - Aggregation-induced photon upconversion (iPUC) based on a triplet-triplet annihilation (TTA) process is successfully developed via controlled self-assembly of donor-acceptor pairs in organogel nanoassemblies. Although segregation of donor from acceptor assemblies has been an outstanding problem in TTA-based UC and iPUC, we resolved this issue by modifying both the triplet donor and aggregation induced emission (AIE)-type acceptor with glutamate-based self-assembling moieties. These donors and acceptors co-assemble to form organogels without segregation. Interestingly, these donor-acceptor binary gels show upconversion at room temperature but the upconversion phenomena were lost upon dissolution of the gels on heating. The observed changes in TTA-UC emission were thermally reversible, reflecting the controlled assembly/disassembly of the binary molecular systems. The observed on/off ratio of UC emission was much higher than that of the aggregation-induced fluorescence of the acceptor, which highlights the important role of iPUC, i.e., multi-exciton TTA for photoluminescence switching. This work bridges iPUC and supramolecular chemistry and provides a new strategy for designing stimuli-responsive upconversion systems.

AB - Aggregation-induced photon upconversion (iPUC) based on a triplet-triplet annihilation (TTA) process is successfully developed via controlled self-assembly of donor-acceptor pairs in organogel nanoassemblies. Although segregation of donor from acceptor assemblies has been an outstanding problem in TTA-based UC and iPUC, we resolved this issue by modifying both the triplet donor and aggregation induced emission (AIE)-type acceptor with glutamate-based self-assembling moieties. These donors and acceptors co-assemble to form organogels without segregation. Interestingly, these donor-acceptor binary gels show upconversion at room temperature but the upconversion phenomena were lost upon dissolution of the gels on heating. The observed changes in TTA-UC emission were thermally reversible, reflecting the controlled assembly/disassembly of the binary molecular systems. The observed on/off ratio of UC emission was much higher than that of the aggregation-induced fluorescence of the acceptor, which highlights the important role of iPUC, i.e., multi-exciton TTA for photoluminescence switching. This work bridges iPUC and supramolecular chemistry and provides a new strategy for designing stimuli-responsive upconversion systems.

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All-or-none switching of photon upconversion in self-assembled organogel systems

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