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Understanding the Ligand Effects on Photophysical, Optical, and Electroluminescent Characteristics of Hybrid Lead Halide Perovskite Nanocrystal Solids
[Image: see text] There has been a tremendous amount of interest in developing high-efficiency light-emitting diodes (LEDs) based on colloidal nanocrystals (NCs) of hybrid lead halide perovskites. Here, we systematically investigate the ligand effects on EL characteristics by tuning the hydrophobici...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2019
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6926956/ https://www.ncbi.nlm.nih.gov/pubmed/31736317 http://dx.doi.org/10.1021/acs.jpclett.9b02950 |
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author | Kumar, Sudhir Jagielski, Jakub Marcato, Tommaso Solari, Simon F. Shih, Chih-Jen |
author_facet | Kumar, Sudhir Jagielski, Jakub Marcato, Tommaso Solari, Simon F. Shih, Chih-Jen |
author_sort | Kumar, Sudhir |
collection | PubMed |
description | [Image: see text] There has been a tremendous amount of interest in developing high-efficiency light-emitting diodes (LEDs) based on colloidal nanocrystals (NCs) of hybrid lead halide perovskites. Here, we systematically investigate the ligand effects on EL characteristics by tuning the hydrophobicity of primary alkylamine ligands used in NC synthesis. By increasing the ligand hydrophobicity, we find (i) a reduced NC size that induces a higher degree of quantum confinement, (ii) a shortened exciton lifetime that increases the photoluminescence quantum yield, (iii) a lowering of refractive index that increases the light outcoupling efficiency, and (iv) an increased thin-film resistivity. Accordingly, ligand engineering allows us to demonstrate high-performance green LEDs exhibiting a maximum external quantum efficiency up to 16.2%. The device operational lifetime, defined by the time lasted when the device luminance reduces to 85% of its initial value, LT85, reaches 243 min at an initial luminance of 516 cd m(–2). |
format | Online Article Text |
id | pubmed-6926956 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-69269562019-12-24 Understanding the Ligand Effects on Photophysical, Optical, and Electroluminescent Characteristics of Hybrid Lead Halide Perovskite Nanocrystal Solids Kumar, Sudhir Jagielski, Jakub Marcato, Tommaso Solari, Simon F. Shih, Chih-Jen J Phys Chem Lett [Image: see text] There has been a tremendous amount of interest in developing high-efficiency light-emitting diodes (LEDs) based on colloidal nanocrystals (NCs) of hybrid lead halide perovskites. Here, we systematically investigate the ligand effects on EL characteristics by tuning the hydrophobicity of primary alkylamine ligands used in NC synthesis. By increasing the ligand hydrophobicity, we find (i) a reduced NC size that induces a higher degree of quantum confinement, (ii) a shortened exciton lifetime that increases the photoluminescence quantum yield, (iii) a lowering of refractive index that increases the light outcoupling efficiency, and (iv) an increased thin-film resistivity. Accordingly, ligand engineering allows us to demonstrate high-performance green LEDs exhibiting a maximum external quantum efficiency up to 16.2%. The device operational lifetime, defined by the time lasted when the device luminance reduces to 85% of its initial value, LT85, reaches 243 min at an initial luminance of 516 cd m(–2). American Chemical Society 2019-11-18 2019-12-19 /pmc/articles/PMC6926956/ /pubmed/31736317 http://dx.doi.org/10.1021/acs.jpclett.9b02950 Text en Copyright © 2019 American Chemical Society This is an open access article published under an ACS AuthorChoice License (http://pubs.acs.org/page/policy/authorchoice_termsofuse.html) , which permits copying and redistribution of the article or any adaptations for non-commercial purposes. |
spellingShingle | Kumar, Sudhir Jagielski, Jakub Marcato, Tommaso Solari, Simon F. Shih, Chih-Jen Understanding the Ligand Effects on Photophysical, Optical, and Electroluminescent Characteristics of Hybrid Lead Halide Perovskite Nanocrystal Solids |
title | Understanding
the Ligand Effects on Photophysical,
Optical, and Electroluminescent Characteristics of Hybrid Lead Halide
Perovskite Nanocrystal Solids |
title_full | Understanding
the Ligand Effects on Photophysical,
Optical, and Electroluminescent Characteristics of Hybrid Lead Halide
Perovskite Nanocrystal Solids |
title_fullStr | Understanding
the Ligand Effects on Photophysical,
Optical, and Electroluminescent Characteristics of Hybrid Lead Halide
Perovskite Nanocrystal Solids |
title_full_unstemmed | Understanding
the Ligand Effects on Photophysical,
Optical, and Electroluminescent Characteristics of Hybrid Lead Halide
Perovskite Nanocrystal Solids |
title_short | Understanding
the Ligand Effects on Photophysical,
Optical, and Electroluminescent Characteristics of Hybrid Lead Halide
Perovskite Nanocrystal Solids |
title_sort | understanding
the ligand effects on photophysical,
optical, and electroluminescent characteristics of hybrid lead halide
perovskite nanocrystal solids |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6926956/ https://www.ncbi.nlm.nih.gov/pubmed/31736317 http://dx.doi.org/10.1021/acs.jpclett.9b02950 |
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