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Updated: Sep 4, 2025

Flash Photolysis of Caged Compounds in the Cilia of Olfactory Sensory Neurons
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Cage-Confinement Induced Emission Enhancement.

Rao Tao1, Xin Zhao1, Tianshu Zhao1

  • 1Yunnan Key Laboratory for Micro/Nano Materials & Technology, National Center for International Research on Photoelectric and Energy Materials, School of Materials and Energy, Yunnan University, Kunming 650091, China.

The Journal of Physical Chemistry Letters
|July 14, 2022
PubMed
Summary
This summary is machine-generated.

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Materials (Basel, Switzerland)·2026

Organic molecular cages (OMCs) like Imi-cage and Phos-cage enhance the fluorescence of triphenylphosphine (TPP) via cage-confinement induced emission enhancement (CCIEE). This strategy significantly boosts photoluminescence for advanced solid-state materials and sensitive explosive detection.

Area of Science:

  • Materials Science
  • Organic Chemistry
  • Photophysics

Background:

  • Organic molecular cages (OMCs) offer unique environments for guest molecules.
  • Triphenylphosphine (TPP) is a nonclassic aggregation-induced emission luminogen (AIEgen).
  • Cage-confinement induced emission enhancement (CCIEE) is a strategy to improve photoluminescence.

Purpose of the Study:

  • To demonstrate CCIEE using Imi-cage and Phos-cage OMCs with TPP.
  • To investigate the effect of OMC confinement on TPP's photoluminescence.
  • To explore the application of these OMCs in sensitive explosive detection.

Main Methods:

  • Design and synthesis of Imi-cage and Phos-cage organic molecular cages.
  • Incorporation of triphenylphosphine (TPP) moiety into the OMCs.

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  • Photoluminescence quantum yield (ΦPL) measurements in solution and solid states.
  • Application of Imi-cage for picric acid detection.

    • Main Results:

    • Imi-cage showed significantly higher photoluminescence (PL) quantum yield (ΦPL) than TPP and Semicage due to confinement.
    • Phos-cage exhibited a remarkable ΦPL of 97.6% in the crystalline state, enhanced by aggregation-induced emission (AIE).
    • Imi-cage demonstrated ultrahigh sensitivity for detecting the explosive picric acid.

    Conclusions:

    • CCIEE via OMC confinement is an effective strategy for significant emission enhancement.
    • This approach facilitates the development of highly fluorescent solid-state materials.
    • The fluorescent properties of Imi-cage enable sensitive detection of explosives.