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Effects of steric encumbrance of iridium(iii) complex core on performance of solution-processed organic light emitting diodes

Iridium(iii) complexes are the most frequently applied commercialized green and red emitters for organic light emitting diode (OLED) displays. Throughout years a significant research effort has been devoted to modify these compounds, in order to make them suitable for cost-effective solution-process...

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Autores principales: Ruduss, Armands, Kokars, Valdis, Tetervenoka, Natalija, Vembris, Aivars, Traskovskis, Kaspars
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9055592/
https://www.ncbi.nlm.nih.gov/pubmed/35516930
http://dx.doi.org/10.1039/d0ra04652c
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author Ruduss, Armands
Kokars, Valdis
Tetervenoka, Natalija
Vembris, Aivars
Traskovskis, Kaspars
author_facet Ruduss, Armands
Kokars, Valdis
Tetervenoka, Natalija
Vembris, Aivars
Traskovskis, Kaspars
author_sort Ruduss, Armands
collection PubMed
description Iridium(iii) complexes are the most frequently applied commercialized green and red emitters for organic light emitting diode (OLED) displays. Throughout years a significant research effort has been devoted to modify these compounds, in order to make them suitable for cost-effective solution-processing techniques, such as inkjet printing. To achieve this, the inherent tendency of the complex molecules to form poorly emissive aggregates needs to be suppressed. In many cases this has been achieved by an encapsulation of the iridium(iii) complex core with dendritic structures, composed of either passive or charge-transporting fragments. In order to validate this approach, we acquired three structural analogues of the conventional green emitter Ir(ppy)(3), which possess gradually increasing sterical encumberment at the complex surface. Corresponding OLEDs were examined, with three distinctively different active emissive layer compositions in terms of charge transportation characteristics. The results show that in the all scenarios the unmodified Ir(ppy)(3) outperforms the compounds with attached bulky groups. The in-device performance of the emitter is directly related to its charge trapping ability, which is being compromised in the presence of dendritic auxiliary substituents.
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spelling pubmed-90555922022-05-04 Effects of steric encumbrance of iridium(iii) complex core on performance of solution-processed organic light emitting diodes Ruduss, Armands Kokars, Valdis Tetervenoka, Natalija Vembris, Aivars Traskovskis, Kaspars RSC Adv Chemistry Iridium(iii) complexes are the most frequently applied commercialized green and red emitters for organic light emitting diode (OLED) displays. Throughout years a significant research effort has been devoted to modify these compounds, in order to make them suitable for cost-effective solution-processing techniques, such as inkjet printing. To achieve this, the inherent tendency of the complex molecules to form poorly emissive aggregates needs to be suppressed. In many cases this has been achieved by an encapsulation of the iridium(iii) complex core with dendritic structures, composed of either passive or charge-transporting fragments. In order to validate this approach, we acquired three structural analogues of the conventional green emitter Ir(ppy)(3), which possess gradually increasing sterical encumberment at the complex surface. Corresponding OLEDs were examined, with three distinctively different active emissive layer compositions in terms of charge transportation characteristics. The results show that in the all scenarios the unmodified Ir(ppy)(3) outperforms the compounds with attached bulky groups. The in-device performance of the emitter is directly related to its charge trapping ability, which is being compromised in the presence of dendritic auxiliary substituents. The Royal Society of Chemistry 2020-07-23 /pmc/articles/PMC9055592/ /pubmed/35516930 http://dx.doi.org/10.1039/d0ra04652c Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by/3.0/
spellingShingle Chemistry
Ruduss, Armands
Kokars, Valdis
Tetervenoka, Natalija
Vembris, Aivars
Traskovskis, Kaspars
Effects of steric encumbrance of iridium(iii) complex core on performance of solution-processed organic light emitting diodes
title Effects of steric encumbrance of iridium(iii) complex core on performance of solution-processed organic light emitting diodes
title_full Effects of steric encumbrance of iridium(iii) complex core on performance of solution-processed organic light emitting diodes
title_fullStr Effects of steric encumbrance of iridium(iii) complex core on performance of solution-processed organic light emitting diodes
title_full_unstemmed Effects of steric encumbrance of iridium(iii) complex core on performance of solution-processed organic light emitting diodes
title_short Effects of steric encumbrance of iridium(iii) complex core on performance of solution-processed organic light emitting diodes
title_sort effects of steric encumbrance of iridium(iii) complex core on performance of solution-processed organic light emitting diodes
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9055592/
https://www.ncbi.nlm.nih.gov/pubmed/35516930
http://dx.doi.org/10.1039/d0ra04652c
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