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The Improvement of the Performance of Sky-Blue OLEDs by Decreasing Interface Traps and Balancing Carriers with PSVA Treatment

The mitigation of interfacial charge accumulation in solution-processed organic light-emitting diodes (s-OLEDs) is an effective method to improve device performance. In this study, the polar solvent vapor annealing (PSVA) method was used to treat two layers in s-OLED, PEDOT:PSS and mCP:DMAC-DPS emit...

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Detalles Bibliográficos
Autores principales: Ning, Yijun, Zhao, Suling, Song, Dandan, Qiao, Bo, Xu, Zheng, Zhou, Yuxiang, Chen, Junfei, Swelm, Wageh, Al-Ghamdi, Ahmed
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8838679/
https://www.ncbi.nlm.nih.gov/pubmed/35160611
http://dx.doi.org/10.3390/polym14030622
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author Ning, Yijun
Zhao, Suling
Song, Dandan
Qiao, Bo
Xu, Zheng
Zhou, Yuxiang
Chen, Junfei
Swelm, Wageh
Al-Ghamdi, Ahmed
author_facet Ning, Yijun
Zhao, Suling
Song, Dandan
Qiao, Bo
Xu, Zheng
Zhou, Yuxiang
Chen, Junfei
Swelm, Wageh
Al-Ghamdi, Ahmed
author_sort Ning, Yijun
collection PubMed
description The mitigation of interfacial charge accumulation in solution-processed organic light-emitting diodes (s-OLEDs) is an effective method to improve device performance. In this study, the polar solvent vapor annealing (PSVA) method was used to treat two layers in s-OLED, PEDOT:PSS and mCP:DMAC-DPS emitting layers, separately, to optimize the carrier transmission and balance. After the double-layer PSVA treatment, the current efficiency increased, the lifetime of the device is improved, the efficiency roll-off alleviated from 33.3% to 26.6%, and the maximum brightness increased by 31.3%. It is worth mentioning that the work function of the EML interface reduced by 0.36 eV, and the initial injection voltage of the electrons also reduced. Simulating the solubility of the LUMO and HOMO molecule parts of the mCP and DMAC-DPS, it was found that the LUMO parts had stronger polarity and higher solubility in polar solution than the HOMO parts. By comparing the untreated luminescent layer films, it was found that the PSVA treatment improved the uniformity of the film morphology. We may infer that a more ordered molecular arrangement enhances carrier transport as the LUMO parts tend to be close to the surface and the reduced local state traps on the EML surface promote electron injection. According to the experimental results, the injection of holes and electrons is enhanced from both sides of the EML, respectively, and the charge accumulated at the interface of s-OLEDs is significantly reduced due to the improvement of carrier-transported characteristics.
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spelling pubmed-88386792022-02-13 The Improvement of the Performance of Sky-Blue OLEDs by Decreasing Interface Traps and Balancing Carriers with PSVA Treatment Ning, Yijun Zhao, Suling Song, Dandan Qiao, Bo Xu, Zheng Zhou, Yuxiang Chen, Junfei Swelm, Wageh Al-Ghamdi, Ahmed Polymers (Basel) Article The mitigation of interfacial charge accumulation in solution-processed organic light-emitting diodes (s-OLEDs) is an effective method to improve device performance. In this study, the polar solvent vapor annealing (PSVA) method was used to treat two layers in s-OLED, PEDOT:PSS and mCP:DMAC-DPS emitting layers, separately, to optimize the carrier transmission and balance. After the double-layer PSVA treatment, the current efficiency increased, the lifetime of the device is improved, the efficiency roll-off alleviated from 33.3% to 26.6%, and the maximum brightness increased by 31.3%. It is worth mentioning that the work function of the EML interface reduced by 0.36 eV, and the initial injection voltage of the electrons also reduced. Simulating the solubility of the LUMO and HOMO molecule parts of the mCP and DMAC-DPS, it was found that the LUMO parts had stronger polarity and higher solubility in polar solution than the HOMO parts. By comparing the untreated luminescent layer films, it was found that the PSVA treatment improved the uniformity of the film morphology. We may infer that a more ordered molecular arrangement enhances carrier transport as the LUMO parts tend to be close to the surface and the reduced local state traps on the EML surface promote electron injection. According to the experimental results, the injection of holes and electrons is enhanced from both sides of the EML, respectively, and the charge accumulated at the interface of s-OLEDs is significantly reduced due to the improvement of carrier-transported characteristics. MDPI 2022-02-05 /pmc/articles/PMC8838679/ /pubmed/35160611 http://dx.doi.org/10.3390/polym14030622 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Ning, Yijun
Zhao, Suling
Song, Dandan
Qiao, Bo
Xu, Zheng
Zhou, Yuxiang
Chen, Junfei
Swelm, Wageh
Al-Ghamdi, Ahmed
The Improvement of the Performance of Sky-Blue OLEDs by Decreasing Interface Traps and Balancing Carriers with PSVA Treatment
title The Improvement of the Performance of Sky-Blue OLEDs by Decreasing Interface Traps and Balancing Carriers with PSVA Treatment
title_full The Improvement of the Performance of Sky-Blue OLEDs by Decreasing Interface Traps and Balancing Carriers with PSVA Treatment
title_fullStr The Improvement of the Performance of Sky-Blue OLEDs by Decreasing Interface Traps and Balancing Carriers with PSVA Treatment
title_full_unstemmed The Improvement of the Performance of Sky-Blue OLEDs by Decreasing Interface Traps and Balancing Carriers with PSVA Treatment
title_short The Improvement of the Performance of Sky-Blue OLEDs by Decreasing Interface Traps and Balancing Carriers with PSVA Treatment
title_sort improvement of the performance of sky-blue oleds by decreasing interface traps and balancing carriers with psva treatment
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8838679/
https://www.ncbi.nlm.nih.gov/pubmed/35160611
http://dx.doi.org/10.3390/polym14030622
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