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Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids

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Published on: May 27, 2020

Tunable Excitonic Processes at Organic Heterojunctions.

Shou-Jie He^1,2, Deng-Ke Wang^1,2, Nan Jiang^1,2

¹Department of Physics, Yunnan University, Kunming, Yunnan, 650091, China.

Advanced Materials (Deerfield Beach, Fla.)

|January 23, 2016

Summary

This summary is machine-generated.

The charge carrier type dictates energy transfer at organic heterojunctions. Electron-rich interfaces favor Auger recombination, while hole-rich interfaces promote exciplex emission, impacting device performance.

Keywords:

Auger recombination charge transfer exciton exciplex emissions organic heterojunctions organic light-emitting diodes

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Using Cyclic Voltammetry, UV-Vis-NIR, and EPR Spectroelectrochemistry to Analyze Organic Compounds

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Published on: October 18, 2018

Area of Science:

Materials Science
Organic Electronics
Photophysics

Background:

Organic-organic heterojunctions are crucial in organic electronic devices.
Understanding charge carrier dynamics at these interfaces is key to optimizing device efficiency.
Both nonradiative Auger recombination and radiative exciplex emissions are significant processes.

Purpose of the Study:

To investigate the influence of majority charge carriers on energy transfer pathways at organic-organic heterojunctions.
To elucidate the conditions favoring Auger recombination versus exciplex emission.
To provide insights for designing efficient organic electronic devices.

Main Methods:

Fabrication of organic-organic heterojunctions with controlled charge carrier concentrations.
Spectroscopic analysis to monitor recombination and emission processes.
Theoretical modeling to understand charge carrier mediation.

Main Results:

Nonradiative Auger recombination dominates in electron-rich heterojunctions.
Radiative exciplex emission is favored in hole-rich heterojunctions.
Both processes coexist in charge-balanced heterojunctions.

Conclusions:

The nature of the majority charge carrier is a critical factor controlling energy dissipation pathways at organic interfaces.
Tailoring the charge carrier balance can selectively enhance or suppress specific recombination/emission channels.
This understanding enables targeted design of organic electronic materials and devices.