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  • 1State Key Laboratory of Organometallic Chemistry and Shanghai Hongkong Joint Laboratory in Chemical Synthesis, Key Laboratory of Synthetic and Self-Assembly Chemistry for Organic Functional Molecules, Ningbo Zhongke Creation Center of New Materials, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, P. R. China.

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Researchers developed new organic long persistent luminescence (OLPL) materials by introducing charge separation. These materials offer hours-long afterglow, visible light excitation, and potential for displays and data storage.

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charge separationdifluoroboron β‐diketonateorganic aftergloworganic long persistent luminescencephosphorescence

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Photophysics

Background:

  • Organic long persistent luminescence (OLPL) materials exhibit power law emission decay and extended afterglow due to charge recombination.
  • Conventional afterglow materials like room-temperature phosphorescence (RTP) and thermally activated delayed fluorescence (TADF) lack the necessary charge separation mechanism for OLPL.
  • Existing OLPL materials are scarce, highlighting the need for novel approaches to induce charge separation.

Purpose of the Study:

  • To develop novel organic materials exhibiting long persistent luminescence (OLPL) with extended afterglow durations.
  • To investigate the incorporation of charge separation mechanisms into organic afterglow systems.
  • To explore the potential applications of these new OLPL materials in areas like displays and information storage.

Main Methods:

  • Construction of two-component RTP/TADF afterglow systems using difluoroboron β-diketonate (BF2bdk) dopants and organic crystalline matrices.
  • Introduction of an electron-donating component into the BF2bdk-matrix systems to facilitate charge separation.
  • Characterization of the photophysical properties, including afterglow duration, excitation, and efficiency, of the resulting three-component materials.

Main Results:

  • The three-component organic materials exhibit visible-light-excitable OLPL afterglow lasting for several hours under ambient conditions.
  • The materials demonstrate efficient harvesting of singlet/triplet excitons by BF2bdk and protection from the crystalline matrix.
  • An estimated OLPL efficiency of approximately 10% was achieved, with brightness comparable to inorganic phosphors.

Conclusions:

  • The study successfully created organic materials with visible-light-excitable, hours-long OLPL afterglow by enabling charge separation.
  • These novel OLPL materials show significant promise for applications in advanced afterglow displays and information storage.
  • This work represents a crucial advancement towards the practical implementation of organic afterglow materials.