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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Photoluminescence: Fluorescence and Phosphorescence01:23

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Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
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Amplified and Inverted Circularly Polarized Luminescence with Color Evolution from Multiple-Constituent Coassemblies

Yunxiao Sang1, Chen Feng2, Min Liu1

  • 1School of Materials Science and Engineering, East China University of Science and Technology, Shanghai 200237, China.

ACS Applied Materials & Interfaces
|November 10, 2025
PubMed
Summary

Researchers developed chiral coassemblies using phenylalanine and pyrene derivatives. These materials exhibit tunable circularly polarized luminescence (CPL) with controlled handedness and amplified dissymmetry factors, crucial for advanced optical devices.

Keywords:
chiralitycircularly polarized luminescencemultiple-constituent coassemblynoncovalent forcessupramolecular chemistry

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Organic Electronics

Background:

  • Developing circularly polarized luminescence (CPL) materials with high dissymmetry factors (g_lum) and controlled properties is vital for optical devices.
  • Multicomponent chiral coassemblies offer a promising route to achieve these advanced material characteristics.

Purpose of the Study:

  • To investigate the programmable coassembly of Fmoc-phenylalanine (Phe) and pyrene derivatives (Py1, Py2) using diverse noncovalent interactions.
  • To explore the enhancement and flexible control of chiroptical properties in ternary coassemblies.

Main Methods:

  • Coassembly of Phe with Py1 and Py2 derivatives, followed by incorporation of metal ions, octafluoronaphthalene (OFN), or tetracyanobenzene (TCNB).
  • Characterization of chiroptical properties, including CPL and dissymmetry factors, under various coassembly conditions.

Main Results:

  • Binary Phe/Py assemblies showed opposite CPL with g_lum values around 10^-2.
  • Incorporating metal ions inverted CPL handedness and amplified |g_lum| to 0.15.
  • Coassembly with OFN and TCNB further tuned CPL properties, including inverted handedness and emission bands.

Conclusions:

  • Diverse noncovalent forces effectively drive multicomponent chiral coassembly.
  • This strategy enables the development of highly efficient CPL materials with tunable chiroptical properties for optical applications.