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Stacking multiple connecting functional materials in tandem organic light-emitting diodes

Tandem device is an important architecture in fabricating high performance organic light-emitting diodes and organic photovoltaic cells. The key element in making a high performance tandem device is the connecting materials stack, which plays an important role in electric field distribution, charge...

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Detalles Bibliográficos
Autores principales: Zhang, Tao, Wang, Deng-Ke, Jiang, Nan, Lu, Zheng-Hong
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5320488/
https://www.ncbi.nlm.nih.gov/pubmed/28225028
http://dx.doi.org/10.1038/srep43130
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author Zhang, Tao
Wang, Deng-Ke
Jiang, Nan
Lu, Zheng-Hong
author_facet Zhang, Tao
Wang, Deng-Ke
Jiang, Nan
Lu, Zheng-Hong
author_sort Zhang, Tao
collection PubMed
description Tandem device is an important architecture in fabricating high performance organic light-emitting diodes and organic photovoltaic cells. The key element in making a high performance tandem device is the connecting materials stack, which plays an important role in electric field distribution, charge generation and charge injection. For a tandem organic light-emitting diode (OLED) with a simple Liq/Al/MoO(3) stack, we discovered that there is a significant current lateral spreading causing light emission over an extremely large area outside the OLED pixel when the Al thickness exceeds 2 nm. This spread light emission, caused by an inductive electric field over one of the device unit, limits one’s ability to fabricate high performance tandem devices. To resolve this issue, a new connecting materials stack with a C(60) fullerene buffer layer is reported. This new structure permits optimization of the Al metal layer in the connecting stack and thus enables us to fabricate an efficient tandem OLED having a high 155.6 cd/A current efficiency and a low roll-off (or droop) in current efficiency.
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spelling pubmed-53204882017-03-01 Stacking multiple connecting functional materials in tandem organic light-emitting diodes Zhang, Tao Wang, Deng-Ke Jiang, Nan Lu, Zheng-Hong Sci Rep Article Tandem device is an important architecture in fabricating high performance organic light-emitting diodes and organic photovoltaic cells. The key element in making a high performance tandem device is the connecting materials stack, which plays an important role in electric field distribution, charge generation and charge injection. For a tandem organic light-emitting diode (OLED) with a simple Liq/Al/MoO(3) stack, we discovered that there is a significant current lateral spreading causing light emission over an extremely large area outside the OLED pixel when the Al thickness exceeds 2 nm. This spread light emission, caused by an inductive electric field over one of the device unit, limits one’s ability to fabricate high performance tandem devices. To resolve this issue, a new connecting materials stack with a C(60) fullerene buffer layer is reported. This new structure permits optimization of the Al metal layer in the connecting stack and thus enables us to fabricate an efficient tandem OLED having a high 155.6 cd/A current efficiency and a low roll-off (or droop) in current efficiency. Nature Publishing Group 2017-02-22 /pmc/articles/PMC5320488/ /pubmed/28225028 http://dx.doi.org/10.1038/srep43130 Text en Copyright © 2017, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Zhang, Tao
Wang, Deng-Ke
Jiang, Nan
Lu, Zheng-Hong
Stacking multiple connecting functional materials in tandem organic light-emitting diodes
title Stacking multiple connecting functional materials in tandem organic light-emitting diodes
title_full Stacking multiple connecting functional materials in tandem organic light-emitting diodes
title_fullStr Stacking multiple connecting functional materials in tandem organic light-emitting diodes
title_full_unstemmed Stacking multiple connecting functional materials in tandem organic light-emitting diodes
title_short Stacking multiple connecting functional materials in tandem organic light-emitting diodes
title_sort stacking multiple connecting functional materials in tandem organic light-emitting diodes
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5320488/
https://www.ncbi.nlm.nih.gov/pubmed/28225028
http://dx.doi.org/10.1038/srep43130
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