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 journalArticle

11 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 languageEnglish
Pages (from-to)305-316
Number of pages12
JournalFaraday Discussions
Volume196
DOIs
Publication statusPublished - Jan 1 2017

Fingerprint

Photons
Agglomeration
photons
Supramolecular chemistry
Gels
gels
glutamates
assembling
stimuli
Self assembly
assemblies
self assembly
Glutamic Acid
Photoluminescence
dissolving
Dissolution
assembly
Fluorescence
excitons
chemistry

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry

Cite this

All-or-none switching of photon upconversion in self-assembled organogel systems. / Duan, Pengfei; Asthana, Deepak; Nakashima, Takuya; Kawai, Tsuyoshi; Yanai, Nobuhiro; Kimizuka, Nobuo.

In: Faraday Discussions, Vol. 196, 01.01.2017, p. 305-316.

Research output: Contribution to journalArticle

Duan, Pengfei ; Asthana, Deepak ; Nakashima, Takuya ; Kawai, Tsuyoshi ; Yanai, Nobuhiro ; Kimizuka, Nobuo. / All-or-none switching of photon upconversion in self-assembled organogel systems. In: Faraday Discussions. 2017 ; Vol. 196. pp. 305-316.
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