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Room temperature amine-free synthesis of phosphonate-capped CsPbBr3 nanocrystals for LED applications

Room temperature amine-free synthesis of phosphonate-capped CsPbBr3 nanocrystals for LED applications
Room temperature amine-free synthesis of phosphonate-capped CsPbBr3 nanocrystals for LED applications
All-inorganic cesium lead bromide (CsPbBr3) perovskite nanocrystals (NCs) have higher thermal stability and lower moisture susceptibility, compared with their organic-inorganic hybrid counterparts. However, the best light-emitting diodes (LEDs) fabricated from pure Cs-based perovskite NCs currently present significantly lower external quantum efficiencies (EQE = 8.7 %) as compared with pure formamidinium lead bromide (FAPbBr3) LEDs (EQE = 13.4 %). This is partially attributable to current purification process for CsPbBr3 NCs, which are typically synthesised by hot-injection using a high concentration of long insulating ligands. However, it has proven challenging to purify NCs effectively to remove excess ligand while retaining a stable, high concentration ink for high-efficiency LED fabrication. Moreover, weakly-bound ammonium ligands resulted from hot-injection processes are also well known source of instability for CsPbBr3 NCs. Thus, improving the synthesis of CsPbBr3 NCs is crucial for the development of more robust perovskite NC LEDs. There are multiple recent studies which demonstrate the strong passivation of CsPbBr3 NCs by phosphonate ligands; However, a simple efficient and highly scalable approach is much needed for future application.

We report the direct room-temperature synthesis of highly luminescent CsPbBr3 NCs capped by phosphonate ligands. The synthesis is amine-free; it helps avoid the substitution of surface cesium for labile ammonium ions, eliminating this source of instability. Our results indicate that phosphonates are an exceptionally promising class of ligands for perovskite NC LED applications. We will also demonstrate that the application of a post-synthetic treatment with didodecyldimethylammonium bromide (DDAB) enables near-unity photoluminescence quantum yield (PLQY). Crucially, high PLQY was obtained for a stable high-concentration dispersion. Thus, coupled with the short ligands employed, this nanocrystal ink shows great promise for LED fabrication.
Brown, Alasdair, Angus Macintyre
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Chin, Xin Yu
dd14be7d-dac9-450c-b854-e15639e9481c
Hooper, Thomas
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Vashishtha, Parth
6e5532eb-f617-4afd-933e-890670fd039e
Bruno, Annalisa
0075275b-4c20-4eb7-aed7-ab4766add0c0
Jamaludin, Nur Fadilah
290891bd-5bb8-4ed1-aa47-61d77dba7374
Pu, Suan-Hui
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Jiang, Liudi
374f2414-51f0-418f-a316-e7db0d6dc4d1
Tey, Ju Nie
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Damodaran, Bahulayan
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Mathews, Nripan
c203a11f-0b0c-4ccf-b79d-b7b026253f3b
Mhaisalkar, Subodh
edf3e5a0-cdc8-41f8-bd2a-902ad615d345
Brown, Alasdair, Angus Macintyre
3107ea0b-bebd-4b75-802e-9b65e28fcacf
Chin, Xin Yu
dd14be7d-dac9-450c-b854-e15639e9481c
Hooper, Thomas
9f39fdda-2185-4b1f-a678-ac45d9d36748
Vashishtha, Parth
6e5532eb-f617-4afd-933e-890670fd039e
Bruno, Annalisa
0075275b-4c20-4eb7-aed7-ab4766add0c0
Jamaludin, Nur Fadilah
290891bd-5bb8-4ed1-aa47-61d77dba7374
Pu, Suan-Hui
8b46b970-56fd-4a4e-8688-28668f648f43
Jiang, Liudi
374f2414-51f0-418f-a316-e7db0d6dc4d1
Tey, Ju Nie
e0ab0eac-f882-4da8-afbc-c3815d1e3ebf
Damodaran, Bahulayan
9949c4ae-d4ae-40f1-981f-d4f7d3b57905
Mathews, Nripan
c203a11f-0b0c-4ccf-b79d-b7b026253f3b
Mhaisalkar, Subodh
edf3e5a0-cdc8-41f8-bd2a-902ad615d345

Brown, Alasdair, Angus Macintyre, Chin, Xin Yu, Hooper, Thomas, Vashishtha, Parth, Bruno, Annalisa, Jamaludin, Nur Fadilah, Pu, Suan-Hui, Jiang, Liudi, Tey, Ju Nie, Damodaran, Bahulayan, Mathews, Nripan and Mhaisalkar, Subodh (2019) Room temperature amine-free synthesis of phosphonate-capped CsPbBr3 nanocrystals for LED applications. 10th International Conference on Materials for Advanced Technologies, Marina Bay Sands, Singapore, Singapore. 23 - 28 Jun 2019.

Record type: Conference or Workshop Item (Other)

Abstract

All-inorganic cesium lead bromide (CsPbBr3) perovskite nanocrystals (NCs) have higher thermal stability and lower moisture susceptibility, compared with their organic-inorganic hybrid counterparts. However, the best light-emitting diodes (LEDs) fabricated from pure Cs-based perovskite NCs currently present significantly lower external quantum efficiencies (EQE = 8.7 %) as compared with pure formamidinium lead bromide (FAPbBr3) LEDs (EQE = 13.4 %). This is partially attributable to current purification process for CsPbBr3 NCs, which are typically synthesised by hot-injection using a high concentration of long insulating ligands. However, it has proven challenging to purify NCs effectively to remove excess ligand while retaining a stable, high concentration ink for high-efficiency LED fabrication. Moreover, weakly-bound ammonium ligands resulted from hot-injection processes are also well known source of instability for CsPbBr3 NCs. Thus, improving the synthesis of CsPbBr3 NCs is crucial for the development of more robust perovskite NC LEDs. There are multiple recent studies which demonstrate the strong passivation of CsPbBr3 NCs by phosphonate ligands; However, a simple efficient and highly scalable approach is much needed for future application.

We report the direct room-temperature synthesis of highly luminescent CsPbBr3 NCs capped by phosphonate ligands. The synthesis is amine-free; it helps avoid the substitution of surface cesium for labile ammonium ions, eliminating this source of instability. Our results indicate that phosphonates are an exceptionally promising class of ligands for perovskite NC LED applications. We will also demonstrate that the application of a post-synthetic treatment with didodecyldimethylammonium bromide (DDAB) enables near-unity photoluminescence quantum yield (PLQY). Crucially, high PLQY was obtained for a stable high-concentration dispersion. Thus, coupled with the short ligands employed, this nanocrystal ink shows great promise for LED fabrication.

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More information

Published date: June 2019
Venue - Dates: 10th International Conference on Materials for Advanced Technologies, Marina Bay Sands, Singapore, Singapore, 2019-06-23 - 2019-06-28

Identifiers

Local EPrints ID: 432395
URI: http://eprints.soton.ac.uk/id/eprint/432395
PURE UUID: c5e267d3-c4dd-4735-91bd-0939d1637ab4
ORCID for Alasdair, Angus Macintyre Brown: ORCID iD orcid.org/0000-0002-0714-3851
ORCID for Suan-Hui Pu: ORCID iD orcid.org/0000-0002-3335-8880
ORCID for Liudi Jiang: ORCID iD orcid.org/0000-0002-3400-825X

Catalogue record

Date deposited: 12 Jul 2019 16:30
Last modified: 10 Nov 2021 03:53

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Contributors

Author: Alasdair, Angus Macintyre Brown ORCID iD
Author: Xin Yu Chin
Author: Thomas Hooper
Author: Parth Vashishtha
Author: Annalisa Bruno
Author: Nur Fadilah Jamaludin
Author: Suan-Hui Pu ORCID iD
Author: Liudi Jiang ORCID iD
Author: Ju Nie Tey
Author: Bahulayan Damodaran
Author: Nripan Mathews
Author: Subodh Mhaisalkar

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