Proceedings of MATSUS Spring 2024 Conference (MATSUS24)
Publication date: 18th December 2023
Perovskite nanocrystals (NCs) have gathered increasing attention as light-emitting materials owing to their high photoluminescence quantum yields (PLQY) and narrow full width at half-maximum (FWHM). However, they have been under critical challenges related to long-term stability, which needs to be addressed for practical applications. To solve this issue, phosphonic acids with greater hydrophobicity have been proposed as alternative ligands to passivate defects and improve the humidity stability of perovskite NCs. In this work, we investigate the photostability of FAPbBr3 NCs with modification of 1-Tetradecylphosphonic acid (TDPA). Employing automated workflow on a robotic pipetting platform, the impact of TDPA on structural and optical properties of FAPbBr3 NCs was thoroughly investigated. This systematic approach enabled us to conduct precise optimization with a step size of 1 mg/ml, guided by the PLQY and photostability of perovskite NCs. Finally, the optimized FAPbBr3/TDPA NCs reached a sufficiently high PLQY of 76% with a narrow band emission of 20 nm, as opposed to 45% PLQY for FAPbBr3/oleic acid NCs. Due to the strong passivation of the Pb-O moiety on the perovskite surface, NCs-filled polymeric binder layers exhibit excellent photostability under environmental conditions. retaining 95% of the initial PL intensity even after 16 h of continuous intense irradiation.
The authors gratefully acknowledge financial support for this work by the Deutsche Forschungsgemeinschaft under GRK 2495/E. H.H. acknowledge the support from Erlangen Graduate School in Advanced Optical Technologies (SAOT). J.Z. and C.J.B. gratefully acknowledge the grant Al-InSu-Pero (ZT-I-PF-5-106) by the Helmholtz Foundation. J.Z. gratefully acknowledges financial support from the China Scholarship Council (CSC). We thank Mingjian Wu from the Department of Materials Science and Engineering of Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU) for help with STEM measurement.
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