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Abstract Lead halide perovskite nanomaterials are among the forefront of developing materials for energy harvesting and light‐emitting applications. Their unique defect tolerance, high photoluminescent quantum yields, and vast synthetic tunability make them attractive for many optoelectronic applications. In this review article, the broad synthetic toolbox of these materials is discussed, including how synthetic conditions can tune the optical properties and dimensionality of the resulting perovskite nanomaterial. Additionally, we discuss the brief history, current state, and bright future of these materials, in tune with their optoelectronic applications, namely in light‐emitting diodes, lasing, photovoltaics, photon interconversion applications, and in photodetectors.

Abstract Since the introduction of lead halide perovskites, tremendous progress has been made regarding their stability, reproducibility and durability. However, one of the issues that remains is related to the interfacial atomic structure arrangement and structure‐property relationship under optical and electrical stimuli. In this critical review, we highlight the recent progress using scanning tunneling microscopy (STM) to understand the nanoscale properties and dynamic processes occurring in these halide perovskite materials. STM is known to be a very challenging technique, which is reflected by the low number of relevant publications in the last years. These initial reports mirror the unique potential of STM to give Ångstrom‐scale insight into the (opto)‐electronic properties, morphology and underlying electronic structure and provide a path toward harnessing the full potential of these materials. However, care must be taken to understand the effects of the perturbations caused by STM and tailor the measurement conditions accordingly.

[This corrects the article DOI: 10.1371/journal.pone.0230299.].

In this review, we highlight the current advancements in the field of triplet sensitization by three-dimensional (3D) perovskite nanocrystals and bulk films. First introduced in 2017, 3D perovskite sensitized upconversion (UC) is a young fast-evolving field due to the tunability of the underlying perovskite material. By tuning the perovskite bandgap, visible-to-ultraviolet, near-infrared-to-visible or green-to-blue UC has been realized, which depicts the broad applicability of this material. As this research field is still in its infancy, we hope to stimulate the field by highlighting the advantages of these perovskite nanocrystals and bulk films, as well as shedding light onto the current drawbacks. In particular, the keywords toxicity, reproducibility and stability must be addressed prior to commercialization of the technology. If successful, photon interconversion is a means to increase the achievable efficiency of photovoltaic cells beyond its current limits by increasing the window of useable wavelengths.