Cesium Lead Halide Perovskite Nanocrystals Prepared by Anion Exchange for Light-Emitting Diodes

Raihana Begum; Xin Yu Chin; Bahulayan Damodaran; Thomas J.N. Hooper; Subodh Mhaisalkar; Nripan Mathews

doi:10.1021/acsanm.9b02450

Cesium Lead Halide Perovskite Nanocrystals Prepared by Anion Exchange for Light-Emitting Diodes

Raihana Begum, Xin Yu Chin, Bahulayan Damodaran, Thomas J.N. Hooper, Subodh Mhaisalkar, Nripan Mathews^*

^*Corresponding author for this work

Nanyang Technological University

Research output: Contribution to journal › Article › peer-review

30 Citations (Scopus)

Abstract

Cesium lead halide perovskite nanocrystals (NCs) have emerged as a promising emitter for lighting and display technologies. However, the iodide-containing CsPb(Br/I)₃ and CsPbI₃ NCs suffer from chemical and phase degradation to nonfunctional orthorhombic (δ) phase. To address this challenge, we developed a facile synthetic protocol for halide exchange in pristine CsPbBr₃ NCs. The protocol involves change in the nucleophilicity (or basicity) of the halide ions in aqueous-organic media which acts as the driving force to facilitate the halide exchange. Our method avoids the use of additives for anion solubilization, which otherwise induces chemical instability and quench the emission. The halide-exchanged CsPb(Br/I)₃ and CsPbI₃ NCs showed enhanced structural and optical properties, such as high phase stability and emission quantum yields up to 94.2%, as compared to the NCs (of same composition) obtained from direct synthesis. In addition, we demonstrated fabrication of light-emitting diodes (LED) based on halide-exchanged CsPb(Br/I)₃ and CsPbI₃ NCs. The devices showed peak external quantum efficiency (EQE) of 1.9% with a peak wavelength of 670 nm and a low luminance turn-on voltage of 2.5 V.

Original language	English
Pages (from-to)	1766-1774
Number of pages	9
Journal	ACS Applied Nano Materials
Volume	3
Issue number	2
DOIs	https://doi.org/10.1021/acsanm.9b02450
Publication status	Published - Feb 28 2020
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2020 American Chemical Society.

ASJC Scopus Subject Areas

General Materials Science

Keywords

halide exchange
lead halide perovskite
LED
nanocrystals
quantum dots

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10.1021/acsanm.9b02450

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title = "Cesium Lead Halide Perovskite Nanocrystals Prepared by Anion Exchange for Light-Emitting Diodes",

abstract = "Cesium lead halide perovskite nanocrystals (NCs) have emerged as a promising emitter for lighting and display technologies. However, the iodide-containing CsPb(Br/I)3 and CsPbI3 NCs suffer from chemical and phase degradation to nonfunctional orthorhombic (δ) phase. To address this challenge, we developed a facile synthetic protocol for halide exchange in pristine CsPbBr3 NCs. The protocol involves change in the nucleophilicity (or basicity) of the halide ions in aqueous-organic media which acts as the driving force to facilitate the halide exchange. Our method avoids the use of additives for anion solubilization, which otherwise induces chemical instability and quench the emission. The halide-exchanged CsPb(Br/I)3 and CsPbI3 NCs showed enhanced structural and optical properties, such as high phase stability and emission quantum yields up to 94.2%, as compared to the NCs (of same composition) obtained from direct synthesis. In addition, we demonstrated fabrication of light-emitting diodes (LED) based on halide-exchanged CsPb(Br/I)3 and CsPbI3 NCs. The devices showed peak external quantum efficiency (EQE) of 1.9% with a peak wavelength of 670 nm and a low luminance turn-on voltage of 2.5 V.",

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author = "Raihana Begum and Chin, {Xin Yu} and Bahulayan Damodaran and Hooper, {Thomas J.N.} and Subodh Mhaisalkar and Nripan Mathews",

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T1 - Cesium Lead Halide Perovskite Nanocrystals Prepared by Anion Exchange for Light-Emitting Diodes

AU - Begum, Raihana

AU - Chin, Xin Yu

AU - Damodaran, Bahulayan

AU - Hooper, Thomas J.N.

AU - Mhaisalkar, Subodh

AU - Mathews, Nripan

PY - 2020/2/28

Y1 - 2020/2/28

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AB - Cesium lead halide perovskite nanocrystals (NCs) have emerged as a promising emitter for lighting and display technologies. However, the iodide-containing CsPb(Br/I)3 and CsPbI3 NCs suffer from chemical and phase degradation to nonfunctional orthorhombic (δ) phase. To address this challenge, we developed a facile synthetic protocol for halide exchange in pristine CsPbBr3 NCs. The protocol involves change in the nucleophilicity (or basicity) of the halide ions in aqueous-organic media which acts as the driving force to facilitate the halide exchange. Our method avoids the use of additives for anion solubilization, which otherwise induces chemical instability and quench the emission. The halide-exchanged CsPb(Br/I)3 and CsPbI3 NCs showed enhanced structural and optical properties, such as high phase stability and emission quantum yields up to 94.2%, as compared to the NCs (of same composition) obtained from direct synthesis. In addition, we demonstrated fabrication of light-emitting diodes (LED) based on halide-exchanged CsPb(Br/I)3 and CsPbI3 NCs. The devices showed peak external quantum efficiency (EQE) of 1.9% with a peak wavelength of 670 nm and a low luminance turn-on voltage of 2.5 V.

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Cesium Lead Halide Perovskite Nanocrystals Prepared by Anion Exchange for Light-Emitting Diodes

Abstract

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Keywords

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