Modulating excitonic recombination effects through one-step synthesis of perovskite nanoparticles for light-emitting diodes

The primary advantages of halide perovskites for light-emitting diodes (LEDs) are solution processability, direct band gap, good charge-carrier diffusion lengths, low trap density, and reasonable carrier mobility. The luminescence in 3 D halide perovskite thin films originates from free electron-hol...

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Main Authors: Kulkarni, Sneha Avinash, Muduli, Subas, Xing, Guichuan, Yantara, Natalia, Li, Mingjie, Chen, Shi, Sum, Tze Chien, Mathews, Nripan, White, Tim J, Mhaisalkar, Subodh Gautam
Other Authors: School of Materials Science and Engineering
Format: Article
Language:English
Published: 2020
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Online Access:https://hdl.handle.net/10356/140976
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spelling sg-ntu-dr.10356-1409762021-01-10T11:18:00Z Modulating excitonic recombination effects through one-step synthesis of perovskite nanoparticles for light-emitting diodes Kulkarni, Sneha Avinash Muduli, Subas Xing, Guichuan Yantara, Natalia Li, Mingjie Chen, Shi Sum, Tze Chien Mathews, Nripan White, Tim J Mhaisalkar, Subodh Gautam School of Materials Science and Engineering School of Physical and Mathematical Sciences Energy Research Institute @ NTU (ERI@N) Engineering::Materials Exciton Formation Light Emitting Diodes The primary advantages of halide perovskites for light-emitting diodes (LEDs) are solution processability, direct band gap, good charge-carrier diffusion lengths, low trap density, and reasonable carrier mobility. The luminescence in 3 D halide perovskite thin films originates from free electron-hole bimolecular recombination. However, the slow bimolecular recombination rate is a fundamental performance limitation. Perovskite nanoparticles could result in improved performance but processability and cumbersome synthetic procedures remain challenges. Herein, these constraints are overcome by tailoring the 3 D perovskite as a near monodisperse nanoparticle film prepared through a one-step in situ deposition method. Replacing methyl ammonium bromide (CH3 NH3 Br, MABr) partially by octyl ammonium bromide [CH3 (CH2 )7 NH3 Br, OABr] in defined mole ratios in the perovskite precursor proved crucial for the nanoparticle formation. Films consisting of the in situ formed nanoparticles displayed signatures associated with excitonic recombination, rather than that of bimolecular recombination associated with 3 D perovskites. This transition was accompanied by enhanced photoluminescence quantum yield (PLQY≈20.5 % vs. 3.40 %). Perovskite LEDs fabricated from the nanoparticle films exhibit a one order of magnitude improvement in current efficiency and doubling in luminance efficiency. The material processing systematics derived from this study provides the means to control perovskite morphologies through the selection and mixing of appropriate additives. NRF (Natl Research Foundation, S’pore) MOE (Min. of Education, S’pore) Accepted version 2020-06-03T05:05:35Z 2020-06-03T05:05:35Z 2017 Journal Article Kulkarni, S. A., Muduli, S., Xing, G., Yantara, N., Li, M., Chen, S., . . . Mhaisalkar, S. G. (2017). Modulating excitonic recombination effects through one-step synthesis of perovskite nanoparticles for light-emitting diodes. ChemSusChem, 10(19), 3818-3824. doi:10.1002/cssc.201701067 1864-5631 https://hdl.handle.net/10356/140976 10.1002/cssc.201701067 28834213 2-s2.0-85029223776 19 10 3818 3824 en ChemSusChem This is the accepted version of the following article: Kulkarni, S. A., Muduli, S., Xing, G., Yantara, N., Li, M., Chen, S., . . . Mhaisalkar, S. G. (2017). Modulating excitonic recombination effects through one-step synthesis of perovskite nanoparticles for light-emitting diodes. ChemSusChem, 10(19), 3818-3824, which has been published in final form at dx.doi.org/10.1002/cssc.201701067. This article may be used for non-commercial purposes in accordance with the Wiley Self-Archiving Policy [https://authorservices.wiley.com/authorresources/Journal-Authors/licensing/self-archiving.html]. 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
Exciton Formation
Light Emitting Diodes
spellingShingle Engineering::Materials
Exciton Formation
Light Emitting Diodes
Kulkarni, Sneha Avinash
Muduli, Subas
Xing, Guichuan
Yantara, Natalia
Li, Mingjie
Chen, Shi
Sum, Tze Chien
Mathews, Nripan
White, Tim J
Mhaisalkar, Subodh Gautam
Modulating excitonic recombination effects through one-step synthesis of perovskite nanoparticles for light-emitting diodes
description The primary advantages of halide perovskites for light-emitting diodes (LEDs) are solution processability, direct band gap, good charge-carrier diffusion lengths, low trap density, and reasonable carrier mobility. The luminescence in 3 D halide perovskite thin films originates from free electron-hole bimolecular recombination. However, the slow bimolecular recombination rate is a fundamental performance limitation. Perovskite nanoparticles could result in improved performance but processability and cumbersome synthetic procedures remain challenges. Herein, these constraints are overcome by tailoring the 3 D perovskite as a near monodisperse nanoparticle film prepared through a one-step in situ deposition method. Replacing methyl ammonium bromide (CH3 NH3 Br, MABr) partially by octyl ammonium bromide [CH3 (CH2 )7 NH3 Br, OABr] in defined mole ratios in the perovskite precursor proved crucial for the nanoparticle formation. Films consisting of the in situ formed nanoparticles displayed signatures associated with excitonic recombination, rather than that of bimolecular recombination associated with 3 D perovskites. This transition was accompanied by enhanced photoluminescence quantum yield (PLQY≈20.5 % vs. 3.40 %). Perovskite LEDs fabricated from the nanoparticle films exhibit a one order of magnitude improvement in current efficiency and doubling in luminance efficiency. The material processing systematics derived from this study provides the means to control perovskite morphologies through the selection and mixing of appropriate additives.
author2 School of Materials Science and Engineering
author_facet School of Materials Science and Engineering
Kulkarni, Sneha Avinash
Muduli, Subas
Xing, Guichuan
Yantara, Natalia
Li, Mingjie
Chen, Shi
Sum, Tze Chien
Mathews, Nripan
White, Tim J
Mhaisalkar, Subodh Gautam
format Article
author Kulkarni, Sneha Avinash
Muduli, Subas
Xing, Guichuan
Yantara, Natalia
Li, Mingjie
Chen, Shi
Sum, Tze Chien
Mathews, Nripan
White, Tim J
Mhaisalkar, Subodh Gautam
author_sort Kulkarni, Sneha Avinash
title Modulating excitonic recombination effects through one-step synthesis of perovskite nanoparticles for light-emitting diodes
title_short Modulating excitonic recombination effects through one-step synthesis of perovskite nanoparticles for light-emitting diodes
title_full Modulating excitonic recombination effects through one-step synthesis of perovskite nanoparticles for light-emitting diodes
title_fullStr Modulating excitonic recombination effects through one-step synthesis of perovskite nanoparticles for light-emitting diodes
title_full_unstemmed Modulating excitonic recombination effects through one-step synthesis of perovskite nanoparticles for light-emitting diodes
title_sort modulating excitonic recombination effects through one-step synthesis of perovskite nanoparticles for light-emitting diodes
publishDate 2020
url https://hdl.handle.net/10356/140976
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