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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 | Schools: | School of Materials Science and Engineering School of Physical and Mathematical Sciences |
Research Centres: | Energy Research Institute @ NTU (ERI@N) | 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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ChemSuSChem 2018.pdf | Manuscript file | 714.98 kB | Adobe PDF | View/Open |
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