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Lone Pairs-Mediated Multiple Through-Space Interactions for Efficient Room-Temperature Phosphorescence.

Fulong Ma1,2, Bo Wu3, Siwei Zhang1

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Achieving efficient organic room temperature phosphorescence (RTP) relies on generating and stabilizing triplet excitons. A novel strategy using lone-pair-mediated through-space interactions (TSIs) effectively induces and stabilizes RTP.

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Area of Science:

  • Organic electronics
  • Photophysics
  • Materials science

Background:

  • Efficient organic room temperature phosphorescence (RTP) is crucial for advanced optoelectronic applications.
  • Realizing RTP requires simultaneous generation and stabilization of triplet excitons, a process hindered by unclear mechanisms and structure-property relationships.

Purpose of the Study:

  • To propose and validate a novel strategy for inducing and stabilizing triplet excitons for efficient RTP.
  • To elucidate the fundamental principles governing RTP through the lens of through-space interactions.

Main Methods:

  • Incorporation of heteroatoms to facilitate through-space n-n and n-π interactions.
  • Delocalization of lone pairs to induce dense splitting of excited-state energy levels.
  • Molecular rigidification via strong through-space interactions (TSIs) to stabilize triplet excitons.

Main Results:

  • The proposed strategy effectively induces RTP by creating matched energy levels with a small singlet-triplet energy gap (ΔE_ST).
  • Multiple intersystem crossing (ISC) channels are generated, facilitating triplet exciton formation.
  • Strong TSIs rigidify molecular structures, enhancing triplet exciton stability and radiative decay.
  • Manipulation of TSI intensity improved RTP efficiency, prolonged emission duration, and increased thermal stability.

Conclusions:

  • A universal strategy based on lone-pair-mediated TSIs is presented for promoting ISC and stabilizing triplet excitons.
  • This approach offers a new perspective on the fundamental mechanism of RTP.
  • The findings provide a pathway for designing efficient and stable RTP materials for diverse applications.