journal article·2020-07-06

Lattice Distortion in Mixed-Anion Lead Halide Perovskite Nanorods Leads to their High Fluorescence Anisotropy

Yongjiang Dou, Fan Cao, Tetiana Dudka, Yunguo Li, Sheng Wang, Chengxi Zhang, Yuan Gao, Xuyong Yang, Andrey L. Rogach

ACS Materials Letters· Volume 2· Issue 7
Publisher page

Abstract

Semiconductor nanorods (NRs) with strong fluorescence anisotropy are considered promising polarized light sources for liquid crystal displays. Here, we achieved a high fluorescence anisotropy value of 0.4 in the mixed-anion lead halide perovskite NRs, which constitutes a four-fold enhancement as compared to pristine CsPbBr3 NRs. This was realized by substituting some smaller bromine anions with larger iodine anions in the orthorhombic CsPbBr3 NRs via anion exchange. The resulting CsPbBr1.2I1.8 NRs kept a highly uniform length of ∼36 nm and width of ∼8.6 nm, and possessed a high emission quantum yield of 83%. On the basis of the DFT calculations, we attribute the improved polarized emission of the mixed-anion perovskite NRs to a moderate structural distortion of PbX6 octahedra units in the orthorhombic perovskite lattice, which results in a preferred direction of the optical transition dipole moment along the Pb–X–Pb axis. Our study provides a guidance for design and fabrication of perovskite NRs with high fluorescence anisotropy.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Perovskite Materials and Applications · Quantum Dots Synthesis And Properties · Luminescence and Fluorescent Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Key Laboratory of Advanced Display and System Applications of Ministry of Education, Shanghai University, 149 Yanchang Road, Shanghai 200072, P. R. China

Department of Materials Science and Engineering, and Centre for Functional Photonics (CFP), City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR, P. R. China

Department of Earth Sciences, Faculty of Mathematical and Physical Sciences, University College London, Gower Street, London, WC1E 6BT UK

Department of Electrical and Computer Engineering, University of Toronto, 35 St. George Street, Toronto, Ontario M5S 1A4, Canada

Funding

State Administration of Foreign Experts Affairs · Research Grants Council, University Grants Committee · Ministry of Science and Technology of the People's Republic of China · Croucher Foundation · Science and Technology Commission of Shanghai Municipality · National Natural Science Foundation of China

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