Publication date: 15th May 2025
Weakly-confined cesium lead halide perovskite nanocrystals (PNCs) boast bright and fast single photon emission at low temperature, making them promising quantum light sources. In this size regime, where the edge length of the crystal is larger than the Bohr exciton diameter, the excited state lifetime is inversely related to the crystal volume. Consequentially, increasing the nanocrystal size can accelerate the radiative rate, allowing the emission to further approach the transform limit necessary for quantum information science applications. However, the realization of large, high-quality nanocrystals has been hindered by colloidal and temperature instability as well as phase transformations.
In this work, we developed a continuous injection growth procedure that allows for the synthesis of nanocrystals with edge lengths tuned between 20 and 120 nm. These PNCs maintain colloidal stability and bright emission: ensemble measurements indicate quantum yields over 70% at room temperature. Transmission electron microscopy images reveal uniform, cuboidal nanocrystals with size distributions less than 10% in deviation and an orthorhombic crystal structure. Optical spectroscopy of single nanocrystals at cryogenic temperatures reveals stable emission and fast radiative rates that accelerate with increasing edge lengths. Our novel synthetic technique establishes a new avenue for perovskite nanocrystal synthesis and demonstrates the rational design and preparation of PNCs with enhanced quantum emission properties.
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