Non-radiative exciton energy transfer in hybrid organic-inorganic heterostructures

TL;DR

This paper demonstrates non-radiative energy transfer from a GaAs quantum well to an organic dye layer, revealing a new hybrid energy transfer mechanism that could improve optoelectronic device efficiency.

Contribution

It provides the first clear experimental evidence of non-radiative exciton energy transfer in hybrid organic-inorganic heterostructures using pump-probe and fluorescence spectroscopy.

Findings

Confirmed non-radiative energy transfer via increased donor decay and acceptor emission rise

Demonstrated a non-contact, non-radiative pumping route for optoelectronic devices

Showed potential for overcoming organic emitter mobility limitations

Abstract

Non-radiative optical energy transfer from a GaAs quantum well to a thin overlayer of an infrared organic semiconductor dye is unambiguously demonstrated. The dynamics of exciton transfer are studied in the time-domain using pump-probe spectroscopy at the donor site and fluorescence spectroscopy at the acceptor site. The effect is observed as simultaneous increase of the population decay rate at the donor and of the rise time of optical emission at the acceptor sites. The hybrid configuration under investigation provides an alternative non-radiative, non-contact pumping route to electrical carrier injection that overcomes the losses imposed by the associated low carrier mobility of organic emitters.