Broadband emission from zero-dimensional Cs4PbI6 perovskite nanocrystals

To overcome the drawbacks in three-dimensional (3D) perovskites, such as instability, surface hydration, and ion migration, recently researchers have focused on comparatively stable lower-dimensional perovskite derivatives. All-inorganic zero-dimensional (0D) perovskites (e.g., Cs4PbX6; X = Cl−, Br−...

Full description

Saved in:
Bibliographic Details
Main Authors: Bhaumik, Saikat, Bruno, Annalisa, Mhaisalkar, Subodh
Other Authors: School of Materials Science and Engineering
Format: Article
Language:English
Published: 2021
Subjects:
Online Access:https://hdl.handle.net/10356/147016
Tags: Add Tag
No Tags, Be the first to tag this record!
Institution: Nanyang Technological University
Language: English
id sg-ntu-dr.10356-147016
record_format dspace
spelling sg-ntu-dr.10356-1470162021-03-20T20:11:17Z Broadband emission from zero-dimensional Cs4PbI6 perovskite nanocrystals Bhaumik, Saikat Bruno, Annalisa Mhaisalkar, Subodh School of Materials Science and Engineering Energy Research Institute @ NTU (ERI@N) Engineering::Materials 3D Perovskites Self-trapped Excitons To overcome the drawbacks in three-dimensional (3D) perovskites, such as instability, surface hydration, and ion migration, recently researchers have focused on comparatively stable lower-dimensional perovskite derivatives. All-inorganic zero-dimensional (0D) perovskites (e.g., Cs4PbX6; X = Cl−, Br−, I−) can be evolved as a high performing material due to their larger exciton binding energy and better structural stability. The clear understanding of carrier recombination process in 0D perovskites is very important for better exploitation in light-emitting devices. In this work, we comprehensively studied the light emission process in 0D Cs4PbI6 nanocrystals (NCs) and interestingly we observe intense white light emission at low temperatures. According to our experimental observations, we conclude that the white light emission contains an intrinsic exciton emission at 2.95 eV along with a broadband emission covering from 1.77 eV to 2.6 eV. We also confirm that the broadband emission is related to the carrier recombination of both self-trapped excitons (STE) and defect state trapped excitons. Our investigations reveal the carrier recombination processes in Cs4PbI6 NCs and provide experimental guidelines for the potential application of white light generation. National Research Foundation (NRF) Published version This research was supported by the National Research Foundation (NRF) Singapore (Program # NRF-CRP14-2014-03). S. B. acknowledges the Department of Science and Technology, India for the financial support through DST-INSPIRE Faculty award (DST/INSPIRE/04/2017/000530). We also acknowledge Qian Chen for his support during experiments. 2021-03-19T02:42:00Z 2021-03-19T02:42:00Z 2020 Journal Article Bhaumik, S., Bruno, A. & Mhaisalkar, S. (2020). Broadband emission from zero-dimensional Cs4PbI6 perovskite nanocrystals. RSC Advances, 10(23), 13431-13436. https://dx.doi.org/10.1039/D0RA00467G 2046-2069 https://hdl.handle.net/10356/147016 10.1039/D0RA00467G 23 10 13431 13436 en RSC Advances © 2020 The Royal Society of Chemistry. This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 distributed Unported Licence. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Engineering::Materials
3D Perovskites
Self-trapped Excitons
spellingShingle Engineering::Materials
3D Perovskites
Self-trapped Excitons
Bhaumik, Saikat
Bruno, Annalisa
Mhaisalkar, Subodh
Broadband emission from zero-dimensional Cs4PbI6 perovskite nanocrystals
description To overcome the drawbacks in three-dimensional (3D) perovskites, such as instability, surface hydration, and ion migration, recently researchers have focused on comparatively stable lower-dimensional perovskite derivatives. All-inorganic zero-dimensional (0D) perovskites (e.g., Cs4PbX6; X = Cl−, Br−, I−) can be evolved as a high performing material due to their larger exciton binding energy and better structural stability. The clear understanding of carrier recombination process in 0D perovskites is very important for better exploitation in light-emitting devices. In this work, we comprehensively studied the light emission process in 0D Cs4PbI6 nanocrystals (NCs) and interestingly we observe intense white light emission at low temperatures. According to our experimental observations, we conclude that the white light emission contains an intrinsic exciton emission at 2.95 eV along with a broadband emission covering from 1.77 eV to 2.6 eV. We also confirm that the broadband emission is related to the carrier recombination of both self-trapped excitons (STE) and defect state trapped excitons. Our investigations reveal the carrier recombination processes in Cs4PbI6 NCs and provide experimental guidelines for the potential application of white light generation.
author2 School of Materials Science and Engineering
author_facet School of Materials Science and Engineering
Bhaumik, Saikat
Bruno, Annalisa
Mhaisalkar, Subodh
format Article
author Bhaumik, Saikat
Bruno, Annalisa
Mhaisalkar, Subodh
author_sort Bhaumik, Saikat
title Broadband emission from zero-dimensional Cs4PbI6 perovskite nanocrystals
title_short Broadband emission from zero-dimensional Cs4PbI6 perovskite nanocrystals
title_full Broadband emission from zero-dimensional Cs4PbI6 perovskite nanocrystals
title_fullStr Broadband emission from zero-dimensional Cs4PbI6 perovskite nanocrystals
title_full_unstemmed Broadband emission from zero-dimensional Cs4PbI6 perovskite nanocrystals
title_sort broadband emission from zero-dimensional cs4pbi6 perovskite nanocrystals
publishDate 2021
url https://hdl.handle.net/10356/147016
_version_ 1695706153882746880