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Updated: Jul 26, 2025

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
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Exciton annihilation in molecular aggregates suppressed through quantum interference.

Sarath Kumar1, Ian S Dunn2, Shibin Deng1

  • 1Department of Chemistry, Purdue University, West Lafayette, IN, USA.

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Controlling exciton-exciton annihilation (EEA) in molecular materials is possible by manipulating exciton quantum phase relationships. This quantum interference approach enables low annihilation rates alongside high exciton concentrations and mobilities.

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Area of Science:

  • Optoelectronics
  • Quantum Chemistry
  • Materials Science

Background:

  • Exciton-exciton annihilation (EEA) is a significant energy loss mechanism in optoelectronic devices and natural photosynthetic systems.
  • Traditionally, EEA has been understood as a non-coherent, diffusion-limited process.

Purpose of the Study:

  • To challenge the conventional understanding of EEA by demonstrating control over the process.
  • To investigate the role of exciton quantum phase relationships in modulating EEA rates.
  • To explore the potential for designing molecular materials with reduced energy loss.

Main Methods:

  • Utilized time-resolved photoluminescence microscopy to measure exciton diffusion and annihilation rates.
  • Experimentally studied two substituted perylene diimide aggregates with distinct excitonic phase envelopes.
  • Employed microscopic theory and simulations to model and rationalize experimental observations.

Main Results:

  • Demonstrated that EEA rates can differ by over two orders of magnitude between molecular aggregates with similar diffusion constants.
  • Identified quantum interference, stemming from spatial phase oscillations of delocalized excitons, as the key factor governing EEA.
  • Achieved excellent agreement between experimental data and theoretical simulations.

Conclusions:

  • EEA can be controlled by leveraging the quantum phase relationships of excitons, challenging the notion of it being solely an incoherent process.
  • Quantum interference offers a novel pathway for designing molecular materials with suppressed EEA.
  • This approach allows for the coexistence of low annihilation rates with high exciton concentrations and mobilities, crucial for efficient optoelectronic devices.