Linear and nonlinear light-emitting behaviors of charge-transfer excitons in heterostructured perovskites (Conference Presentation)

Bin A. Hu

doi:10.1117/12.2637439

3 October 2022 Linear and nonlinear light-emitting behaviors of charge-transfer excitons in heterostructured perovskites (Conference Presentation)

Bin A. Hu

Author Affiliations +

Proceedings Volume PC12208, Organic and Hybrid Light Emitting Materials and Devices XXVI; PC122080B (2022) https://doi.org/10.1117/12.2637439
Event: SPIE Organic Photonics + Electronics, 2022, San Diego, California, United States

Abstract

Charge-transfer excitons are named as artificially engineered excitons carrying cooperatively mutually tunable energy, polarization, and spin-orbital coupling parameters that can be conveniently formed at heterostructured interfaces for wide-range optoelectronic applications. However, charge-transfer excitons have been remaining as an explored phenomenon in the new-generation semiconductors, namely solution-processing semiconducting perovskites, limiting the tuning abilities to control optoelectronic properties. Recently, we found that charge-transfer excitons can be conveniently formed as metastable states in both linear and nonlinear polarization regimes in quasi-2D and superlattice-2D heterostructured Pb/Sn perovskites. In linear polarization regime, charge-transfer excitons have led to broad light-emitting and photo-detecting capabilities with AC operating conditions in quasi-2D heterostructured perovskites [(PEA2PbI4)x:(PEA2SnI4)1-x]. In nonlinear polarization regime, charge-transfer excitons can enable normally-difficult-observed optical phenomena such as infrared-to-visible up-conversion luminescence and X-ray scintillation with self-amplified behaviors in superlattice-2D heterostructured perovskites [(PEA)2Pb1-x SnxI4]. Clearly, artificially-engineered charge-transfer excitons provide a new platform to further advance the optoelectronic properties in 2D perovskites. This presentation will discuss the key parameters of controlling charge-transfer excitons in quasi-2D and superlattice-2D heterostructured perovskites towards generating advanced light-emitting and photo-detecting properties in both linear and nonlinear polarization regimes.

Conference Presentation

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Bin A. Hu "Linear and nonlinear light-emitting behaviors of charge-transfer excitons in heterostructured perovskites (Conference Presentation)", Proc. SPIE PC12208, Organic and Hybrid Light Emitting Materials and Devices XXVI, PC122080B (3 October 2022); https://doi.org/10.1117/12.2637439

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KEYWORDS

Excitons

Perovskite

Polarization

Optoelectronics

Semiconductors

Luminescence

Nonlinear optics

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