Nature of Self-Trapped Exciton Emission in Zero-Dimensional Cs2ZrCl6 Perovskite Nanocrystals

• Published in: The journal of physical chemistry letters Vol. 14; no. 34; pp. 7665 - 7671
• Main Authors: He, Yanmei, Liu, Siping, Yao, Zehan, Zhao, Qian, Chabera, Pavel, Zheng, Kaibo, Yang, Bin, Pullerits, Tönu, Chen, Junsheng
• Format: Journal Article
• Language: English
• Published: American Chemical Society 31.08.2023
• Subjects: Atom and Molecular Physics and Optics; Atom- och molekylfysik och optik; Chemical Sciences; Condensed Matter Physics; Den kondenserade materiens fysik; Fysik; Fysikalisk kemi; Kemi; Letter; Natural Sciences; Naturvetenskap; Physical Chemistry; Physical Insights into Light Interacting with Matter; Physical Sciences
• ISSN: 1948-7185; 1948-7185
• DOI: 10.1021/acs.jpclett.3c01878

Low dimensional perovskite-inspired materials with self-tapped exciton (STE) emission have stimulated a surge of cutting-edge research in optoelectronics. Despite numerous efforts on developing versatile low-dimensional perovskite-inspired materials with efficient STE emissions, there is little emphasis on the intrinsic dynamics of STE-based broad emission in these materials. Here, we investigated the excited state dynamics in zero-dimensional (0D) Cs2ZrCl6 nanocrystals (NCs) with efficient blue STE emission. By using femtosecond transient absorption (fs-TA) spectroscopy, the ultrafast STE formation process within 400 fs is directly observed. Then, the formed STEs relax to an intermediate STE state with a lifetime of ∼180 ps before reaching the emissive STE state with a lifetime of ∼15 μs. Our work offers a comprehensive and precise dynamic picture of STE emission in low-dimensional metal halides and sheds light on extending their potential applications.