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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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Electroluminescent Clusters.

Xiaojun Zhang1, Hui Xu1

  • 1Key Laboratory of Functional, Inorganic Material Chemistry, Ministry of Education, School of Chemistry and Materials, Heilongjiang University, 74 Xuefu Road, 150080, Harbin, P. R. China.

Angewandte Chemie (International Ed. in English)
|December 11, 2023
PubMed
Summary
This summary is machine-generated.

Optoelectronic cluster materials offer 100% exciton harvesting for efficient light-emitting devices. Tuning ligand engineering and device optimization enhances performance, paving the way for next-generation displays and lighting.

Keywords:
ClusterCluster Light-Emitting DiodeDevice EngineeringElectroluminescenceLigand Engineering

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Area of Science:

  • Materials Science
  • Chemistry
  • Physics

Background:

  • Optoelectronic cluster materials are rapidly advancing for light-emitting devices.
  • They offer 100% exciton harvesting and unique hybrid structures.
  • These materials exhibit tunable excited-state characteristics for thermally activated delayed fluorescence and/or phosphorescence, along with photo- and thermo-stability.

Purpose of the Study:

  • To overview recent progress in electroluminescent cluster materials.
  • To discuss structure-property relationships in these materials.
  • To inspire further development of cluster light-emitting diodes.

Main Methods:

  • Ligand engineering to tune excited-state compositions and enhance radiative components.
  • Reducing cluster-centered quenching states through controlled functionalization.
  • Device engineering, including host matrix optimization and interfacial modification, to alleviate triplet quenching and passivate defects.

Main Results:

  • Record external quantum efficiencies for cluster light-emitting diodes have reached approximately 30%.
  • Ligand and device engineering strategies have been identified to balance optoelectronic properties.
  • Improvements in processing and defect passivation have been achieved.

Conclusions:

  • Electroluminescent cluster materials show significant promise for advanced displays and lighting.
  • Continued research into structure-property relationships is crucial for further development.
  • Cluster light-emitting diodes are becoming competitive for next-generation applications.