Achieving High Moisture Tolerance in Pseudohalide Perovskite Nanocrystals for Light-Emitting Diode Application

Harshita Bhatia, Masoumeh Kashavarz, Cristina Martin, Liam Van Gaal, Yiyue Zhang, Brend de Coen, Nadine J. Schrenker, Donato Valli, Martin Ottesen, Martin Bremholm, Joris Van de Vondel, Sara Bals, Johan Hofkens, Elke Debroye*

*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaperJournal articleResearchpeer-review

Abstract

The addition of potassium thiocyanate (KSCN) to the FAPbBr3 structure and subsequent post-treatment of nanocrystals (NCs) lead to high quantum confinement, resulting in a photoluminescent quantum yield (PLQY) approaching unity and microsecond decay times. This synergistic approach demonstrated exceptional stability under humid conditions, retaining 70% of the PLQY for over a month, while the untreated NCs degrade within 24 h. Additionally, the devices incorporating the post-treated NCs displayed 1.5% external quantum efficiency (EQE), a 5-fold improvement over untreated devices. These results provide promising opportunities for the use of perovskites in moisture-stable optoelectronics.
Original languageEnglish
JournalACS Applied Optical Materials
Volume1
Issue6
Pages (from-to)1184-1191
Number of pages8
ISSN2771-9855
DOIs
Publication statusPublished - May 2023

Keywords

  • Chemical structure
  • Diffraction
  • Lattice
  • Perovskites
  • Stability

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