Coupling Perovskite Quantum Dot Pairs in Solution using Nanoplasmonic Assembly

TL;DR

This paper demonstrates a nanoplasmonic assembly method to couple perovskite quantum dots, revealing energy transfer effects and paving the way for quantum information applications.

Contribution

It introduces a novel solution-based assembly technique for coupling PQDs and provides experimental and theoretical insights into their energy transfer behavior.

Findings

Observed a 1.1 meV red-shift in emission wavelength.

Coupling is consistent with resonant energy transfer.

Demonstrates potential for quantum information applications.

Abstract

Perovskite quantum dots (PQDs) provide a robust solution-based approach to efficient solar cells, bright light-emitting devices, and quantum sources of light. Quantifying heterogeneity and understanding coupling between dots is critical for these applications. We use double-nanohole optical trapping to size individual dots and correlate to emission energy shifts from quantum confinement. We were able to assemble a second dot in the trap, which allows us to observe the coupling between dots. We observe a systematic red-shift of 1.1 $\pm$ 0.6 meV in the emission wavelength. Theoretical analysis shows that the observed shift is consistent with resonant energy transfer and is unusually large due to moderate-to-large quantum confinement in PQDs. This demonstrates the promise of PQDs for entanglement in quantum information applications. This work enables future in situ control of PQD growth as well as studies of the coupling between small PQD assemblies with quantum information applications in mind.