Department of Physics & Astronomy

[Kyeong-Yoon Baek, Dr. Jeongjae Lee, Prof. Tae-Woo Lee, Prof. Keehoon Kang & Prof. Takhee Lee] Mechanochemistry-driven engineering of 0D/3D heterostructure for designing highly luminescent Cs–Pb–Br perovskites

July 25, 2022l Hit 357

Embedding metal–halide perovskite particles within an insulating host matrix has proven to be an effective strategy for revealing the outstanding luminescence properties of perovskites as an emerging class of light emitters. Particularly, unexpected bright green emission observed in a nominally pure zero-dimensional cesium–lead–bromide perovskite (Cs4PbBr6) has triggered intensive research in better understanding the serendipitous incorporation of emissive guest species within the Cs4PbBr6 host. However, a limited controllability over such heterostructural configurations in conventional solution-based synthesis methods has limited the degree of freedom in designing synthesis routes for accessing different structural and compositional configurations of these host–guest species. In this study, we provide means of enhancing the luminescence properties in the nominal Cs4PbBr6 powder through a guided heterostructural configuration engineering enabled by solid-state mechanochemical synthesis. Realized by an in-depth study on time-dependent evaluation of optical and structural properties during the synthesis of Cs4PbBr6, our target-designed synthesis protocol to promote the endotaxial formation of Cs4PbBr6/CsPbBr3 heterostructures provides key insights for understanding and designing kinetics-guided syntheses of highly luminescent perovskite emitters for light-emitting applications.

The first author of this paper, Mr. Kyeong-Yoon Baek, is currently an undergraduate student in the Department of Physics & Astronomy at Seoul National University and is a research intern in Prof. Takhee Lee's group. Starting this fall, he will attend graduate school in the Department of Physics at Harvard University.

Authors:  Kyeong-Yoon Baek†, Woocheol Lee†, Jonghoon Lee, Jaeyoung Kim, Heebeom Ahn, Jae Il Kim, Junwoo Kim, Hyungbin Lim, Jiwon Shin, Yoon-Joo Ko,  Hyeon-Dong Lee, Richard H. Friend, Tae-Woo Lee*, Jeongjae Lee*, Keehoon Kang* & Takhee Lee* (†Equally first authors, *co-corresponding authors)
DOI: 10.1038/s41467-022-31924-x

Published online: July 23, 2022