Crown Ethers Enable Room-Temperature Synthesis of CsPbBr3 Quantum Dots for Light-Emitting Diodes

Sjoerd A. Veldhuis; Yan Fong Ng; Riyas Ahmad; Annalisa Bruno; Nur Fadilah Jamaludin; Bahulayan Damodaran; Nripan Mathews; Subodh G. Mhaisalkar

doi:10.1021/acsenergylett.7b01257

Crown Ethers Enable Room-Temperature Synthesis of CsPbBr₃ Quantum Dots for Light-Emitting Diodes

Sjoerd A. Veldhuis, Yan Fong Ng, Riyas Ahmad, Annalisa Bruno, Nur Fadilah Jamaludin, Bahulayan Damodaran, Nripan Mathews, Subodh G. Mhaisalkar^*

^*Corresponding author for this work

Nanyang Technological University

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

110 Citations (Scopus)

Abstract

The synthesis of all-inorganic cesium lead halide perovskite quantum dots (QDs) typically requires high temperatures, stringent conditions, large quantities of surface ligands, and judicious purification steps to overcome ligand-induced charge injection barriers in optoelectronic devices. Low-temperature syntheses generally require lower ligand concentrations but are severely limited by the low solubility of the Cs precursor. We describe an innovative and general approach employing crown ethers under ambient conditions to overcome these solubility limitations. The crown ethers facilitate complete dissolution of the CsBr precursor, rendering CsPbBr₃ QD inks practical for device fabrication. The resultant light-emitting diodes (LEDs) displayed bright green emission, with a current efficiency and external quantum efficiency of 9.22 cd A^-1 and 2.64%, respectively. This represents the first LED based on CsPbBr₃ QDs prepared at room temperature. Lastly, the crown ethers form core-shell structures, opening new avenues to exploit their strong coordination strength.

Original language	English
Pages (from-to)	526-531
Number of pages	6
Journal	ACS Energy Letters
Volume	3
Issue number	3
DOIs	https://doi.org/10.1021/acsenergylett.7b01257
Publication status	Published - Mar 9 2018
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2018 American Chemical Society.

ASJC Scopus Subject Areas

Chemistry (miscellaneous)
Renewable Energy, Sustainability and the Environment
Fuel Technology
Energy Engineering and Power Technology
Materials Chemistry

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This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1021/acsenergylett.7b01257

Cite this

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title = "Crown Ethers Enable Room-Temperature Synthesis of CsPbBr3 Quantum Dots for Light-Emitting Diodes",

abstract = "The synthesis of all-inorganic cesium lead halide perovskite quantum dots (QDs) typically requires high temperatures, stringent conditions, large quantities of surface ligands, and judicious purification steps to overcome ligand-induced charge injection barriers in optoelectronic devices. Low-temperature syntheses generally require lower ligand concentrations but are severely limited by the low solubility of the Cs precursor. We describe an innovative and general approach employing crown ethers under ambient conditions to overcome these solubility limitations. The crown ethers facilitate complete dissolution of the CsBr precursor, rendering CsPbBr3 QD inks practical for device fabrication. The resultant light-emitting diodes (LEDs) displayed bright green emission, with a current efficiency and external quantum efficiency of 9.22 cd A-1 and 2.64%, respectively. This represents the first LED based on CsPbBr3 QDs prepared at room temperature. Lastly, the crown ethers form core-shell structures, opening new avenues to exploit their strong coordination strength.",

author = "Veldhuis, {Sjoerd A.} and Ng, {Yan Fong} and Riyas Ahmad and Annalisa Bruno and Jamaludin, {Nur Fadilah} and Bahulayan Damodaran and Nripan Mathews and Mhaisalkar, {Subodh G.}",

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year = "2018",

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doi = "10.1021/acsenergylett.7b01257",

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AU - Veldhuis, Sjoerd A.

AU - Ng, Yan Fong

AU - Ahmad, Riyas

AU - Bruno, Annalisa

AU - Jamaludin, Nur Fadilah

AU - Damodaran, Bahulayan

AU - Mathews, Nripan

AU - Mhaisalkar, Subodh G.

PY - 2018/3/9

Y1 - 2018/3/9

N2 - The synthesis of all-inorganic cesium lead halide perovskite quantum dots (QDs) typically requires high temperatures, stringent conditions, large quantities of surface ligands, and judicious purification steps to overcome ligand-induced charge injection barriers in optoelectronic devices. Low-temperature syntheses generally require lower ligand concentrations but are severely limited by the low solubility of the Cs precursor. We describe an innovative and general approach employing crown ethers under ambient conditions to overcome these solubility limitations. The crown ethers facilitate complete dissolution of the CsBr precursor, rendering CsPbBr3 QD inks practical for device fabrication. The resultant light-emitting diodes (LEDs) displayed bright green emission, with a current efficiency and external quantum efficiency of 9.22 cd A-1 and 2.64%, respectively. This represents the first LED based on CsPbBr3 QDs prepared at room temperature. Lastly, the crown ethers form core-shell structures, opening new avenues to exploit their strong coordination strength.

AB - The synthesis of all-inorganic cesium lead halide perovskite quantum dots (QDs) typically requires high temperatures, stringent conditions, large quantities of surface ligands, and judicious purification steps to overcome ligand-induced charge injection barriers in optoelectronic devices. Low-temperature syntheses generally require lower ligand concentrations but are severely limited by the low solubility of the Cs precursor. We describe an innovative and general approach employing crown ethers under ambient conditions to overcome these solubility limitations. The crown ethers facilitate complete dissolution of the CsBr precursor, rendering CsPbBr3 QD inks practical for device fabrication. The resultant light-emitting diodes (LEDs) displayed bright green emission, with a current efficiency and external quantum efficiency of 9.22 cd A-1 and 2.64%, respectively. This represents the first LED based on CsPbBr3 QDs prepared at room temperature. Lastly, the crown ethers form core-shell structures, opening new avenues to exploit their strong coordination strength.

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