Homogeneous Surface Attachment of Functional Ligands for Compatible Perovskite Nanoparticle Crystallization

20 Pages Posted: 5 Sep 2024

See all articles by Jin Young Kim

Jin Young Kim

Chung-Ang University

Woongsik Jang

Chung-Ang University

Tae Yong Im

Chung-Ang University

Dong Hwan Wang

Chung-Ang University

Abstract

Metal halide perovskite-based nanoparticles exhibit high quantum yields (QYs) compared to their bulk phases due to an increased stability, a bright exciton triplet state, and superfluorescence properties. This study suggests a strategy to synthesize pure red-emitting perovskite quantum dots (PQDs) at low-temperatures by controlling the molarities of the monodentate ligands in dimethylformamide (DMF) as a polar-solvent. Ligand compatibility was analyzed based on the LaMer model. A range of various conditions are identified using plots of the compatible/incompatible synthetic conditions. The red PQD with the highest iodine content exhibits an QY of 76.9%, along with a strong photoluminescence intensity. This exhibits no discoloration after 90 h, and maintain 88% of the luminescence intensity, indicating almost no change in CIE coordinates. This confirms that defects of vacancies on the perovskite surface are filled with the appropriate ligand. Overall, this approach provides a facile platform for obtaining high quality DMF-based pure-red PQDs.

Keywords: perovskite, quantum dot, nanoparticles, red characteristics, LaMer model

Suggested Citation

Kim, Jin Young and Jang, Woongsik and Im, Tae Yong and Wang, Dong Hwan, Homogeneous Surface Attachment of Functional Ligands for Compatible Perovskite Nanoparticle Crystallization. Available at SSRN: https://ssrn.com/abstract=4947257 or http://dx.doi.org/10.2139/ssrn.4947257

Jin Young Kim

Chung-Ang University ( email )

221 Heuksuk-dong
Dongjak-gu
Seoul, 156-756
Korea, Republic of (South Korea)

Woongsik Jang

Chung-Ang University ( email )

221 Heuksuk-dong
Dongjak-gu
Seoul, 156-756
Korea, Republic of (South Korea)

Tae Yong Im

Chung-Ang University ( email )

221 Heuksuk-dong
Dongjak-gu
Seoul, 156-756
Korea, Republic of (South Korea)

Dong Hwan Wang (Contact Author)

Chung-Ang University ( email )

221 Heuksuk-dong
Dongjak-gu
Seoul, 156-756
Korea, Republic of (South Korea)

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