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Photoluminescence: Fluorescence and Phosphorescence01:23

Photoluminescence: Fluorescence and Phosphorescence

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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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Luminescence, the emission of light by a substance that has absorbed energy, is a process that involves the interaction of molecules with light. The energy-level diagram, or Jablonski diagram, is a graphical representation of these interactions, illustrating the various states and transitions a molecule can undergo. In a typical Jablonski diagram, the lowest horizontal line represents the ground-state energy of the molecule, which is usually a singlet state. This state represents the energies...
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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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Molecular Spectroscopy: Absorption and Emission01:14

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Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels.  Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.
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Emission Spectra02:39

Emission Spectra

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When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
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Emergent clusteroluminescence from nonemissive molecules.

Jianyu Zhang1, Zuping Xiong1,2,3, Haoke Zhang4,5,6

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Clusteroluminescence (CL) enables non-conjugated molecules to emit visible light when clustered. This emerging field explores CL materials, their mechanisms, and applications beyond traditional conjugated systems.

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Area of Science:

  • Photophysics and Materials Science
  • Supramolecular Chemistry

Background:

  • Efficient luminescence was traditionally linked to conjugated molecules.
  • Non-conjugated molecules typically do not emit visible light.
  • The clustered state of non-emissive molecules can exhibit luminescence.

Purpose of the Study:

  • To provide a comprehensive overview of clusteroluminescence (CL).
  • To discuss the development, features, mechanisms, and applications of CL materials.
  • To highlight the shift from molecular to aggregate-level interactions.

Main Methods:

  • Literature review and synthesis of existing research on CL.
  • Analysis of photophysical properties of various CL systems.
  • Categorization of CL materials (organic, inorganic, metallic, hybrid).

Main Results:

  • Clusteroluminescence (CL) is an emerging phenomenon where non-conjugated molecules emit visible light in a clustered state.
  • CL exhibits unique photophysical behaviors driven by inter- or intra-cluster electronic interactions.
  • Diverse materials, including organic, inorganic, metallic, and hybrid clusters, demonstrate CL properties.

Conclusions:

  • Clusteroluminescence expands the scope of luminescent materials beyond conjugated systems.
  • Understanding non-covalent interactions in aggregates is key to CL.
  • CL materials offer potential for novel applications in optics and sensing.