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Identifying and Reducing Interfacial Losses to Enhance Color-Pure Electroluminescence in Blue-Emitting Perovskite Nanoplatelet Light-Emitting Diodes
[Image: see text] Perovskite nanoplatelets (NPls) hold promise for light-emitting applications, having achieved photoluminescence quantum efficiencies approaching unity in the blue wavelength range, where other metal-halide perovskites have typically been ineffective. However, the external quantum e...
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/PMC6516044/ https://www.ncbi.nlm.nih.gov/pubmed/31119197 http://dx.doi.org/10.1021/acsenergylett.9b00571 |
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author | Hoye, Robert L. Z. Lai, May-Ling Anaya, Miguel Tong, Yu Gałkowski, Krzysztof Doherty, Tiarnan Li, Weiwei Huq, Tahmida N. Mackowski, Sebastian Polavarapu, Lakshminarayana Feldmann, Jochen MacManus-Driscoll, Judith L. Friend, Richard H. Urban, Alexander S. Stranks, Samuel D. |
author_facet | Hoye, Robert L. Z. Lai, May-Ling Anaya, Miguel Tong, Yu Gałkowski, Krzysztof Doherty, Tiarnan Li, Weiwei Huq, Tahmida N. Mackowski, Sebastian Polavarapu, Lakshminarayana Feldmann, Jochen MacManus-Driscoll, Judith L. Friend, Richard H. Urban, Alexander S. Stranks, Samuel D. |
author_sort | Hoye, Robert L. Z. |
collection | PubMed |
description | [Image: see text] Perovskite nanoplatelets (NPls) hold promise for light-emitting applications, having achieved photoluminescence quantum efficiencies approaching unity in the blue wavelength range, where other metal-halide perovskites have typically been ineffective. However, the external quantum efficiencies (EQEs) of blue-emitting NPl light-emitting diodes (LEDs) have reached only 0.12%. In this work, we show that NPl LEDs are primarily limited by a poor electronic interface between the emitter and hole injector. We show that the NPls have remarkably deep ionization potentials (≥6.5 eV), leading to large barriers for hole injection, as well as substantial nonradiative decay at the NPl/hole-injector interface. We find that an effective way to reduce these nonradiative losses is by using poly(triarylamine) interlayers, which lead to an increase in the EQE of the blue (464 nm emission wavelength) and sky-blue (489 nm emission wavelength) LEDs to 0.3% and 0.55%, respectively. Our work also identifies the key challenges for further efficiency increases. |
format | Online Article Text |
id | pubmed-6516044 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-65160442019-05-20 Identifying and Reducing Interfacial Losses to Enhance Color-Pure Electroluminescence in Blue-Emitting Perovskite Nanoplatelet Light-Emitting Diodes Hoye, Robert L. Z. Lai, May-Ling Anaya, Miguel Tong, Yu Gałkowski, Krzysztof Doherty, Tiarnan Li, Weiwei Huq, Tahmida N. Mackowski, Sebastian Polavarapu, Lakshminarayana Feldmann, Jochen MacManus-Driscoll, Judith L. Friend, Richard H. Urban, Alexander S. Stranks, Samuel D. ACS Energy Lett [Image: see text] Perovskite nanoplatelets (NPls) hold promise for light-emitting applications, having achieved photoluminescence quantum efficiencies approaching unity in the blue wavelength range, where other metal-halide perovskites have typically been ineffective. However, the external quantum efficiencies (EQEs) of blue-emitting NPl light-emitting diodes (LEDs) have reached only 0.12%. In this work, we show that NPl LEDs are primarily limited by a poor electronic interface between the emitter and hole injector. We show that the NPls have remarkably deep ionization potentials (≥6.5 eV), leading to large barriers for hole injection, as well as substantial nonradiative decay at the NPl/hole-injector interface. We find that an effective way to reduce these nonradiative losses is by using poly(triarylamine) interlayers, which lead to an increase in the EQE of the blue (464 nm emission wavelength) and sky-blue (489 nm emission wavelength) LEDs to 0.3% and 0.55%, respectively. Our work also identifies the key challenges for further efficiency increases. American Chemical Society 2019-04-17 2019-05-10 /pmc/articles/PMC6516044/ /pubmed/31119197 http://dx.doi.org/10.1021/acsenergylett.9b00571 Text en Copyright © 2019 American Chemical Society This is an open access article published under a Creative Commons Attribution (CC-BY) License (http://pubs.acs.org/page/policy/authorchoice_ccby_termsofuse.html) , which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited. |
spellingShingle | Hoye, Robert L. Z. Lai, May-Ling Anaya, Miguel Tong, Yu Gałkowski, Krzysztof Doherty, Tiarnan Li, Weiwei Huq, Tahmida N. Mackowski, Sebastian Polavarapu, Lakshminarayana Feldmann, Jochen MacManus-Driscoll, Judith L. Friend, Richard H. Urban, Alexander S. Stranks, Samuel D. Identifying and Reducing Interfacial Losses to Enhance Color-Pure Electroluminescence in Blue-Emitting Perovskite Nanoplatelet Light-Emitting Diodes |
title | Identifying and Reducing Interfacial Losses to Enhance
Color-Pure Electroluminescence in Blue-Emitting Perovskite Nanoplatelet
Light-Emitting Diodes |
title_full | Identifying and Reducing Interfacial Losses to Enhance
Color-Pure Electroluminescence in Blue-Emitting Perovskite Nanoplatelet
Light-Emitting Diodes |
title_fullStr | Identifying and Reducing Interfacial Losses to Enhance
Color-Pure Electroluminescence in Blue-Emitting Perovskite Nanoplatelet
Light-Emitting Diodes |
title_full_unstemmed | Identifying and Reducing Interfacial Losses to Enhance
Color-Pure Electroluminescence in Blue-Emitting Perovskite Nanoplatelet
Light-Emitting Diodes |
title_short | Identifying and Reducing Interfacial Losses to Enhance
Color-Pure Electroluminescence in Blue-Emitting Perovskite Nanoplatelet
Light-Emitting Diodes |
title_sort | identifying and reducing interfacial losses to enhance
color-pure electroluminescence in blue-emitting perovskite nanoplatelet
light-emitting diodes |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6516044/ https://www.ncbi.nlm.nih.gov/pubmed/31119197 http://dx.doi.org/10.1021/acsenergylett.9b00571 |
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