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Oxadiazole derivatives as bipolar host materials for high-performance blue and green phosphorescent organic light-emitting diodes
By combining two n-type groups, pyridine and oxadiazole, with one p-type carbazole group, two novel bipolar hosts, namely 2-(3-(9H-carbazol-9-yl)-[1,1′-biphenyl]-3-yl)-5-(pyridin-2-yl)-1,3,4-oxadiazole (PyOxd-mCz) and 2-(4′-(9H-carbazol-9-yl)-[1,1′-biphenyl]-3-yl)-5-(pyridin-2-yl)-1,3,4-oxadiazole (...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Royal Society of Chemistry
2019
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9072674/ https://www.ncbi.nlm.nih.gov/pubmed/35530763 http://dx.doi.org/10.1039/c9ra07129f |
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author | Wang, Yanming Duan, Keke Li, Guoxiang Yu, Gewen |
author_facet | Wang, Yanming Duan, Keke Li, Guoxiang Yu, Gewen |
author_sort | Wang, Yanming |
collection | PubMed |
description | By combining two n-type groups, pyridine and oxadiazole, with one p-type carbazole group, two novel bipolar hosts, namely 2-(3-(9H-carbazol-9-yl)-[1,1′-biphenyl]-3-yl)-5-(pyridin-2-yl)-1,3,4-oxadiazole (PyOxd-mCz) and 2-(4′-(9H-carbazol-9-yl)-[1,1′-biphenyl]-3-yl)-5-(pyridin-2-yl)-1,3,4-oxadiazole (PyOxd-pCz) have been developed as hosts for blue and green phosphorescent organic light-emitting diodes (PhOLEDs). The two compounds exhibit similar HOMO levels of −5.64 eV for PyOxd-mCz and −5.63 eV for PyOxd-pCz and the same LUMO level of −2.60 eV. With a more twisted configuration due to meta connections, PyOxd-mCz possesses a higher triplet energy level (E(T) = 2.77 eV) and more balanced carrier transport than PyOxd-pCz (E(T) = 2.60 eV). PyOxd-mCz hosted devices achieve a peak current efficiency of 39.7 cd A(−1) and a maximum EQE of 20.8% with a low turn-on voltage of 3.5 V for FIrpic and 55.2 cd A(−1) and 16.4% for Ir(ppy)(3). Apart from the appropriate frontier molecular orbital levels and sufficiently high triplet energy of PyOxd-mCz, the more balanced carrier transport plays a key role for excellent device performance. |
format | Online Article Text |
id | pubmed-9072674 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2019 |
publisher | The Royal Society of Chemistry |
record_format | MEDLINE/PubMed |
spelling | pubmed-90726742022-05-06 Oxadiazole derivatives as bipolar host materials for high-performance blue and green phosphorescent organic light-emitting diodes Wang, Yanming Duan, Keke Li, Guoxiang Yu, Gewen RSC Adv Chemistry By combining two n-type groups, pyridine and oxadiazole, with one p-type carbazole group, two novel bipolar hosts, namely 2-(3-(9H-carbazol-9-yl)-[1,1′-biphenyl]-3-yl)-5-(pyridin-2-yl)-1,3,4-oxadiazole (PyOxd-mCz) and 2-(4′-(9H-carbazol-9-yl)-[1,1′-biphenyl]-3-yl)-5-(pyridin-2-yl)-1,3,4-oxadiazole (PyOxd-pCz) have been developed as hosts for blue and green phosphorescent organic light-emitting diodes (PhOLEDs). The two compounds exhibit similar HOMO levels of −5.64 eV for PyOxd-mCz and −5.63 eV for PyOxd-pCz and the same LUMO level of −2.60 eV. With a more twisted configuration due to meta connections, PyOxd-mCz possesses a higher triplet energy level (E(T) = 2.77 eV) and more balanced carrier transport than PyOxd-pCz (E(T) = 2.60 eV). PyOxd-mCz hosted devices achieve a peak current efficiency of 39.7 cd A(−1) and a maximum EQE of 20.8% with a low turn-on voltage of 3.5 V for FIrpic and 55.2 cd A(−1) and 16.4% for Ir(ppy)(3). Apart from the appropriate frontier molecular orbital levels and sufficiently high triplet energy of PyOxd-mCz, the more balanced carrier transport plays a key role for excellent device performance. The Royal Society of Chemistry 2019-10-08 /pmc/articles/PMC9072674/ /pubmed/35530763 http://dx.doi.org/10.1039/c9ra07129f Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/ |
spellingShingle | Chemistry Wang, Yanming Duan, Keke Li, Guoxiang Yu, Gewen Oxadiazole derivatives as bipolar host materials for high-performance blue and green phosphorescent organic light-emitting diodes |
title | Oxadiazole derivatives as bipolar host materials for high-performance blue and green phosphorescent organic light-emitting diodes |
title_full | Oxadiazole derivatives as bipolar host materials for high-performance blue and green phosphorescent organic light-emitting diodes |
title_fullStr | Oxadiazole derivatives as bipolar host materials for high-performance blue and green phosphorescent organic light-emitting diodes |
title_full_unstemmed | Oxadiazole derivatives as bipolar host materials for high-performance blue and green phosphorescent organic light-emitting diodes |
title_short | Oxadiazole derivatives as bipolar host materials for high-performance blue and green phosphorescent organic light-emitting diodes |
title_sort | oxadiazole derivatives as bipolar host materials for high-performance blue and green phosphorescent organic light-emitting diodes |
topic | Chemistry |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9072674/ https://www.ncbi.nlm.nih.gov/pubmed/35530763 http://dx.doi.org/10.1039/c9ra07129f |
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