Engineering Perovskite Emissions via Optical Quasi-Bound-States-in-the-Continuum

TL;DR

This paper introduces an optical nanoantenna array with polarization-controlled quasi-bound-states-in-the-continuum resonances that can significantly shift and enhance perovskite quantum dot emissions in a non-invasive manner, enabling advanced optoelectronic applications.

Contribution

The study demonstrates a novel lithographically defined nanoantenna array that achieves large wavelength shifts and emission enhancement of perovskite quantum dots using q-BIC resonances.

Findings

Achieved ~39 nm wavelength shift in photoluminescence.

Realized 21-fold emission enhancement.

Enabled spectral tuning via polarization control at ambient conditions.

Abstract

Metal halide perovskite quantum dots (PQDs) have emerged as promising materials due to their exceptional photoluminescence (PL) properties. A wide range of applications could benefit from adjustable luminescence properties, while preserving the physical and chemical properties of the PQDs. Therefore, post-synthesis engineering has gained attention recently, involving the use of ion-exchange or external stimuli, such as extreme pressure, magnetic and electric fields. Nevertheless, these methods typically suffer from spectrum broadening, intensity quenching or yield multiple bands. Alternatively, photonic antennas can modify the radiative decay channel of perovskites via the Purcell effect, with the largest wavelength shift being 8 nm to date, at an expense of 5-fold intensity loss. Here, we present an optical nanoantenna array with polarization-controlled quasi-bound-states-in-the-continuum (q-BIC) resonances, which can engineer and shift the photoluminescence wavelength over a ~39 nm range and confers a 21-fold emission enhancement of FAPbI3 perovskite QDs. The spectrum is engineered in a non-invasive manner via lithographically defined antennas and the pump laser polarization at ambient conditions. Our research provides a path towards advanced optoelectronic devices, such as spectrally tailored quantum emitters and lasers.