# Diffusion mechanism of exciplex. 2. Energy transfer mechanism

## TL;DR

This paper investigates the diffusion mechanism of exciplexes in organic optoelectronic devices, revealing that energy transfer occurs mainly through a Dexter-type exchange process, which impacts device performance.

## Contribution

It demonstrates that exciplex diffusion is primarily driven by Dexter-type energy transfer, providing new insights into exciplex behavior in organic electronics.

## Key findings

- Energy transfer occurs via Dexter mechanism
- ET rate decreases exponentially with distance
- Diffusion influences device performance

## Abstract

Excited-state charge-transfer complexes (exciplexes) have been actively exploited in organic optoelectronic devices to improve performance; however, diffusion of exciplexes has not been actively studied despite its influence on performance due to the lack of apparent charge-transfer absorption. In the preceding paper, we studied the energy transfer (ET) from exciplexes to exciplex-forming pairs in relation to the charge-transfer absorption of the exciplex state, resulting in the exciplex diffusion. In this paper, we report that the ET takes place dominantly via the Dexter-type exchange mechanism, from the exponential decrease of the ET rate constant with separation between exciplexes.

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Source: https://tomesphere.com/paper/1906.09625