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Related Concept Videos

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.
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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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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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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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Cocrystallization-Induced Red Ultralong Organic Phosphorescence.

Zheng Yin1,2, Zongliang Xie1, Xianhe Zhang1

  • 1Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore, 117585, Singapore.

Angewandte Chemie (International Ed. in English)
|October 24, 2024
PubMed
Summary

Researchers developed an organic cocrystal for efficient red afterglow. This pyrene-based material exhibits persistent thermally activated delayed fluorescence (TADF) and ultralong organic phosphorescence (UOP) with high quantum yield and long lifetime.

Keywords:
Co-crystallizationIntermolecular interactionsPhosphorescenceRed afterglow

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Photophysics

Background:

  • Organic cocrystals offer tunable optical properties via multicomponent self-assembly.
  • Challenges in cocrystal systems include inefficient long-wavelength emission and low phosphorescence efficiency due to non-radiative decay.
  • The energy gap law often governs non-radiative processes in organic emitters.

Purpose of the Study:

  • To achieve efficient and long-lived red afterglow in an organic cocrystal system.
  • To investigate the role of molecular design and intermolecular interactions in enhancing luminescence properties.
  • To explore the potential of combining thermally activated delayed fluorescence (TADF) and ultralong organic phosphorescence (UOP).

Main Methods:

  • Fabrication of a pyrene (Py) cocrystal system incorporating a second component (NPYC4) with TADF and UOP properties.
  • Characterization of the cocrystal's structure and optical properties, including quantum yield and emission lifetime.
  • Analysis of intermolecular interactions and energy level alignment within the cocrystal structure.

Main Results:

  • The NPYC4-Py cocrystal exhibits efficient dual-mode emission: persistent TADF and UOP.
  • Achieved a high quantum yield of 58% and a remarkably long lifetime of 362.05 ms for the red afterglow.
  • Cocrystal stacking weakens intermolecular π-π interactions, stabilizing triplet excitons and facilitating efficient red phosphorescence from pyrene.

Conclusions:

  • The developed cocrystal system overcomes limitations of traditional organic emitters, providing efficient red afterglow.
  • Precise control over cocrystal stacking and intermolecular interactions is crucial for optimizing luminescence.
  • This research offers a viable strategy for designing efficient red ultralong organic phosphorescence materials through co-crystallization.