Nonsymmetrical connection of two identical building blocks: constructing donor-acceptor molecules as deep blue emitting materials for efficient organic emitting diodes

Zhiqiang Li, Chenglong Li, Yincai Xu, Ning Xie, Xuechen Jiao, Yue Wang

Research output: Contribution to journalArticleResearchpeer-review

Abstract

We propose a strategy to construct deep blue emission molecules based on the concept of nonsymmetrical connection of two identical-conjugated groups. It was demonstrated that the nonsymmetrical connection strategy indeed resulted in the separation of the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) and the formation of a donor-acceptor (D-A) structure. For D-A molecules constructed by two identical groups, the degree of charge transfer is weaker and deep blue emission is easily achieved. Two D-A molecules (PIpPI and PImPI) were synthesized by employing diphenyl-phenanthroimidazole (PI) as a building block. The nonsymmetric connection of PI groups endows these molecules with a D-A feature that can result in a bipolar transport property. The nondoped organic light-emitting diodes with PIpPI and PImPI as emitter exhibit deep-blue emission and maximum external quantum efficiencies of 8.84% and 6.83%, respectively.

Original languageEnglish
Pages (from-to)842-847
Number of pages6
JournalJournal of Physical Chemistry Letters
Volume10
Issue number4
DOIs
Publication statusPublished - 21 Feb 2019

Cite this

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title = "Nonsymmetrical connection of two identical building blocks: constructing donor-acceptor molecules as deep blue emitting materials for efficient organic emitting diodes",
abstract = "We propose a strategy to construct deep blue emission molecules based on the concept of nonsymmetrical connection of two identical-conjugated groups. It was demonstrated that the nonsymmetrical connection strategy indeed resulted in the separation of the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) and the formation of a donor-acceptor (D-A) structure. For D-A molecules constructed by two identical groups, the degree of charge transfer is weaker and deep blue emission is easily achieved. Two D-A molecules (PIpPI and PImPI) were synthesized by employing diphenyl-phenanthroimidazole (PI) as a building block. The nonsymmetric connection of PI groups endows these molecules with a D-A feature that can result in a bipolar transport property. The nondoped organic light-emitting diodes with PIpPI and PImPI as emitter exhibit deep-blue emission and maximum external quantum efficiencies of 8.84{\%} and 6.83{\%}, respectively.",
author = "Zhiqiang Li and Chenglong Li and Yincai Xu and Ning Xie and Xuechen Jiao and Yue Wang",
year = "2019",
month = "2",
day = "21",
doi = "10.1021/acs.jpclett.9b00300",
language = "English",
volume = "10",
pages = "842--847",
journal = "Journal of Physical Chemistry Letters",
issn = "1948-7185",
publisher = "American Chemical Society",
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Nonsymmetrical connection of two identical building blocks : constructing donor-acceptor molecules as deep blue emitting materials for efficient organic emitting diodes. / Li, Zhiqiang; Li, Chenglong; Xu, Yincai; Xie, Ning; Jiao, Xuechen; Wang, Yue.

In: Journal of Physical Chemistry Letters, Vol. 10, No. 4, 21.02.2019, p. 842-847.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

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T2 - constructing donor-acceptor molecules as deep blue emitting materials for efficient organic emitting diodes

AU - Li, Zhiqiang

AU - Li, Chenglong

AU - Xu, Yincai

AU - Xie, Ning

AU - Jiao, Xuechen

AU - Wang, Yue

PY - 2019/2/21

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AB - We propose a strategy to construct deep blue emission molecules based on the concept of nonsymmetrical connection of two identical-conjugated groups. It was demonstrated that the nonsymmetrical connection strategy indeed resulted in the separation of the highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital (LUMO) and the formation of a donor-acceptor (D-A) structure. For D-A molecules constructed by two identical groups, the degree of charge transfer is weaker and deep blue emission is easily achieved. Two D-A molecules (PIpPI and PImPI) were synthesized by employing diphenyl-phenanthroimidazole (PI) as a building block. The nonsymmetric connection of PI groups endows these molecules with a D-A feature that can result in a bipolar transport property. The nondoped organic light-emitting diodes with PIpPI and PImPI as emitter exhibit deep-blue emission and maximum external quantum efficiencies of 8.84% and 6.83%, respectively.

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