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Related Concept Videos

Variables Affecting Phosphorescence and Fluorescence01:26

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Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
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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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The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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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.
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Fluorometers and spectrofluorometers are two types of instruments used for measuring molecular fluorescence. These instruments differ in how they select excitation and emission wavelengths and the type of light sources they utilize. Fluorometers use absorption interference filters to choose excitation and emission wavelengths. The excitation source in a fluorometer is typically a low-pressure mercury vapor lamp that emits intense lines distributed throughout the ultraviolet and visible regions.
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Topology-Driven Conformational Constraint Enables High-Temperature Organic Phosphorescence.

Tongyue Wu1, Chengshuo Xu1, Weijiang Guan1

  • 1State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, China.

Angewandte Chemie (International Ed. in English)
|April 24, 2026
PubMed
Summary

Researchers developed a topology-driven strategy for stable high-temperature organic phosphorescence. By confining emitters in a rigid framework, they achieved persistent emission even at 150°C.

Keywords:
high‐temperature phosphorescencehydrogen‐bonded frameworkssupramolecular materialstopological confinement

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Supramolecular Chemistry

Background:

  • Organic phosphorescence is crucial for lighting and displays.
  • High temperatures typically degrade phosphorescent materials by accelerating non-radiative decay.
  • Developing stable organic phosphorescent materials for high-temperature applications remains a significant challenge.

Purpose of the Study:

  • To investigate a topology-driven conformational constraint strategy for achieving high-temperature organic phosphorescence.
  • To explore the relationship between emitter geometry and phosphorescence performance within a supramolecular framework.
  • To develop environmentally robust organic phosphorescent materials for demanding conditions.

Main Methods:

  • Constructed a hydrogen-bonded supramolecular framework using melamine and terephthalic acid as a rigid scaffold.
  • Embedded terphenyl-based emitters with varying geometries (linear, bent, trigonal-like) within the framework.
  • Investigated phosphorescence performance, including emission lifetime and stability at elevated temperatures.

Main Results:

  • Demonstrated that topological confinement within the supramolecular framework effectively constrains emitter conformations.
  • Observed a clear geometry-dependent trend in phosphorescence, with trigonal-like emitters showing superior performance.
  • Achieved persistent phosphorescence with a lifetime of 1.22 s at room temperature and 344 ms at 150°C.
  • Fabricated flexible luminescent films from these materials for high-temperature operation.

Conclusions:

  • Topology-driven conformational constraint is an effective strategy for enhancing the thermal stability of organic phosphorescence.
  • The rigidity and connectivity of the supramolecular framework play a critical role in reducing non-radiative decay pathways.
  • The developed materials exhibit excellent environmental stability and potential for high-temperature optoelectronic applications.