Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/140976
Title: Modulating excitonic recombination effects through one-step synthesis of perovskite nanoparticles for light-emitting diodes
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
Keywords: Engineering::Materials
Issue Date: 2017
Source: 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
Journal: ChemSusChem
Abstract: 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.
URI: https://hdl.handle.net/10356/140976
ISSN: 1864-5631
DOI: 10.1002/cssc.201701067
Rights: 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].
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:ERI@N Journal Articles

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