Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 897, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2021.163182
Keywords
Perovskite; Quantum-dot (QD); Nanoparticle (NP); Quantum-dot light-emitting diode (QLED); Tetraoctylammonium bromide (TOAB)
Categories
Funding
- Ministry of Science and Technology, Taiwan [MOST 108-2221-E-131-009-MY2]
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This study demonstrates the use of TOAB salts for ligand-exchange reactions to improve the stability and device performance of CsPbI3 perovskite nanoparticles. TOAB passivation provides a negatively polarized surface, higher steric hindrance, and a small amount of Br- anions in the NP lattice, significantly enhancing NP stability. The red NP-based light-emitting diodes (NpLEDs) based on TOAB-passivated NPs exhibit excellent performance with a maximum luminescence of 1345 cd/m(2) and a maximum external quantum efficiency of 11.7%.
In this study, we demonstrate a ligand-exchange reaction using tetraoctylammonium bromide (TOAB) salts for the as-synthesized CsPbI3 perovskite nanoparticles (NPs) to ensure NPs with stable and improved device performance. TOAB passivation provides a negatively polarized halide-rich surface, higher steric hindrance, and a small amount of Br- anions in the NP lattice to significantly improve the NP stability. The red NP-based light-emitting diodes (NpLEDs) based on TOAB-passivated NPs also exhibited excellent performance because of shorter ligands and stable NPs, with a maximum luminescence of 1345 cd/m(2) and a maximum external quantum efficiency of 11.7%. (C) 2021 Elsevier B.V. All rights reserved.
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