Abstract
Quasi-two-dimensional (quasi-2D) perovskites have attracted extraordinary attention due to their superior semiconducting properties and have emerged as one of the most promising materials for next-generation light-emitting diodes (LEDs). The outstanding optical properties originate from their structural characteristics. In particular, the inherent quantum-well structure endows them with a large exciton binding energy due to the strong dielectric- and quantum-confinement effects; the corresponding energy transfer among different n-value species thus results in high photoluminescence quantum yields (PLQYs), particularly at low excitation intensities. The review herein presents an overview of the inherent properties of quasi-2D perovskite materials, the corresponding energy transfer and spectral tunability methodologies for thin films, as well as their application in high-performance LEDs. We then summarize the challenges and potential research directions towards developing high-performance and stable quasi-2D PeLEDs. The review thus provides a systematic and timely summary for the community to deepen the understanding of quasi-2D perovskite materials and resulting LED devices.
Highlights
Light-emitting diodes (LEDs) are changing the lighting and display industry and have obtained significant advances compared to traditional lighting sources
We summarize the recent reports in the field of Perovskite LEDs (PeLEDs) on improving the light extraction efficiency (LEE) and corresponding strategies (Table 2)
Antenna n > 5 Population inversion. Owing to their excellent optical and electrical properties, quasi-2D perovskites have flourished in LEDs in merely five years, promising to emulate established technologies such as organic LEDs (OLEDs) and quantum-dot LEDs (QLEDs)
Summary
Light-emitting diodes (LEDs) are changing the lighting and display industry and have obtained significant advances compared to traditional lighting sources. Crystallization kinetics In light of the efficient excitonic radiative recombination, efforts have been devoted to fabricating highquality quasi-2D perovskite films, aiming for LED Carrier recombination characteristics Energy transfer in quasi-2D perovskite films originates from the graded band structure because of mixed n-value species.
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