Self-trapped excitons in two-dimensional perovskites

Abstract

With strong electron–phonon coupling, the self-trapped excitons are usually formed in materials, which leads to the local lattice distortion and localized excitons. The self-trapping strongly depends on the dimensionality of the materials. In the three-dimensional case, there is a potential barrier for self-trapping, whereas no such barrier is present for quasi-one-dimensional systems. Two-dimensional (2D) systems are marginal cases with a much lower potential barrier or nonexistent potential barrier for the self-trapping, leading to the easier formation of self-trapped states. Self-trapped excitons emission exhibits a broadband emission with a large Stokes shift below the bandgap. 2D perovskites are a class of layered structure material with unique optical properties and would find potential promising optoelectronic. In particular, self-trapped excitons are present in 2D perovskites and can significantly influence the optical and electrical properties of 2D perovskites due to the soft characteristic and strong electron–phonon interaction. Here, we summarized the luminescence characteristics, origins, and characterizations of self-trapped excitons in 2D perovskites and finally gave an introduction to their applications in optoelectronics.

Graphical abstract

Keywords

self-trapped exciton (STE) / two-dimensional (2D) perovskites / broadband emission / electron–phonon coupling / optoelectronic applications

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Acknowledgements

D. L. acknowledges the support from the National Basic Research Program of China (No. 2018YFA0704403), the National Natural Science Foundation of China (NSFC) (Grant No. 61674060), and Innovation Fund of Wuhan National Laboratory for Optoelectronics (WNLO).

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