Electrically modulated near-field energy transfer between quantum dots and perovskite nanocrystals

Abstract

Electrically controlling resonance energy transfer of optical emitters provides a novel mechanism to switch nanoscale light sources on and off individually for optoelectronic applications. Cesium lead halide nanocrystals have emerged as a candidate for optoelectronic applications, seamlessly blending the favorable advantages of perovskites and quantum dots. Here, we demonstrate nonradiative energy transfer between CsPbBr₃ nanocrystals and colloidal quantum dots in a heterostructure device. We fabricate devices with semiconducting, chemically synthesised cesium lead bromide (CsPbBr₃) perovskite nanocrystals (PerNCs) as an electrostatically gated donor and core–shell quantum dots (QDs) as an acceptor. With the help of a bottom-gate electrode and hafnium oxide (HfO₂) dielectric layer, the Förster resonance energy transfer (FRET) efficiency can be modulated. Thicknesses of the dielectric, donor, and acceptor layers were fine-tuned and the optimized device configuration exhibits up to 80% modulation of photoluminescence intensity, making it suitable for potential applications in optoelectronic devices and energy conversion.