Facile synthesis of two-dimensional Ruddlesden–Popper perovskite quantum dots with fine-tunable optical properties

• Published in: Nanoscale research letters Vol. 13; no. 1; pp. 247 - 7
• Main Authors: Chang, Yi-Hsuan, Lin, Jou-Chun, Chen, Yi-Chia, Kuo, Tsung-Rong, Wang, Di-Yan
• Format: Journal Article
• Language: English
• Published: New York Springer US 22.08.2018; Springer Nature B.V; SpringerOpen
• Subjects: Chemistry and Materials Science; Energy gap; Materials Science; Molecular Medicine; Nano Express; Nanochemistry; Nanocrystal; Nanomaterials; Nanoscale Science and Technology; Nanotechnology; Nanotechnology and Microengineering; One-pot synthesis; Optical properties; Optoelectronic devices; Perovskites; Photoluminescence; Photons; Photovoltaic cells; Photovoltaics; Quantum confinement effect; Quantum dots; Solar cells; Stability; Synthesis; Thickness; Two-dimensional Ruddlesden–Popper perovskite; One-pot synthesis; Quantum confinement effect; Two-dimensional Ruddlesden–Popper perovskite; Nanocrystal
• ISSN: 1931-7573; 1556-276X
• DOI: 10.1186/s11671-018-2664-5

In hybrid organic–inorganic and all-inorganic metal halide perovskite nanomaterials, two-dimensional (2D) Ruddlesden–Popper (RP) perovskites have become one of the most interesting materials because of tunable bandgaps varied with the layer thickness, effective modulation of the electron-hole confinement, and high stability. Here, we report a one-pot synthesis of 2D RP perovskite (BA) 2 (MA) n −  1 Pb n X 3 n  + 1 (BA = 1-butylammonium, MA = methylammonium, X = Br or I) quantum dots (QDs) with an average size of 10 nm at room temperature. The (BA) 2 (MA) n −  1 Pb n Br 3 n  + 1 (Br series) QDs and (BA) 2 (MA) n  − 1 Pb n I 3 n  + 1 (I series) QDs exhibited tunable emitting spectrum in the range of 410–523 nm and 527–761 nm, respectively, with full width at half maximum (FWHM) of 12–75 nm. The emission color was tuned by the ratio of MA and halide. The photoluminescence quantum yield of 2D perovskite QDs reached 48.6% with more thermodynamic stability in comparison with 3D MAPbX 3 QDs. Overall results indicated that developing a solution synthesis for 2D RP perovskite QDs with great optical properties paves the way toward future optoelectronic devices and perovskite quantum dot photovoltaics.