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Bis-Sulfone- and Bis-Sulfoxide-Spirobifluorenes: Polar Acceptor Hosts with Tunable Solubilities for Blue-Phosphorescent Light-Emitting Devices

Ertl, C. D. and Bolink, H. J. and Housecroft, C. E. and Constable, E. C. and Ortí, E. and Junquera-Hernández, J. M. and Neuburger, M. and Shavaleev, N. M. and Nazeeruddin, M. K. and Vonlanthen, D.. (2016) Bis-Sulfone- and Bis-Sulfoxide-Spirobifluorenes: Polar Acceptor Hosts with Tunable Solubilities for Blue-Phosphorescent Light-Emitting Devices. European journal of organic chemistry (11). pp. 2037-2047.

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Official URL: http://edoc.unibas.ch/42536/

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Abstract

Bis-sulfone- and bis-sulfoxide-spirobifluorenes are a promising class of high-triplet-energy electron-acceptor hosts for blue phosphorescent light-emitting devices. The molecular design and synthetic route are simple and facilitate tailoring of the solubilities of the host materials without lowering the high-energy triplet state. The syntheses and characterization (including single-crystal structures) of four electron-accepting hosts are reported; the trend in their reduction potentials is consistent with the electron-withdrawing nature of the sulfone or sulfoxide substituents. Emission maxima of 421–432 nm overlap with the MLCT absorption of the sky-blue emitter bis(4,6-difluorophenyl-pyridinato)(picolinato)iridium(III) (FIrpic), allowing effective energy transfer from the acceptor hosts to FIrpic. Theoretical calculations show that the introduction of sulfone groups leads to better electron acceptors compared to analogous phosphine oxide functionalized hosts and, at the same time, preserves the energy of the lowest-lying triplet above that of the FIrpic emitter. The new hosts have been tested in phosphorescent light-emitting electrochemical cells (LECs). Large effects of the various solubilizing moieties on the device performance are observed and discussed.
Faculties and Departments:05 Faculty of Science > Departement Chemie > Chemie > Anorganische Chemie (Constable)
05 Faculty of Science > Departement Chemie > Chemie > Anorganische Chemie (Housecroft)
UniBasel Contributors:Housecroft, Catherine Elizabeth and Constable, Edwin Charles and Ertl, Cathrin and Neuburger, Markus
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Wiley-VCH Verlag
ISSN:1434-193X
Note:Publication type according to Uni Basel Research Database: Journal article -- Above PDF is the peer reviewed version, for the final published version see DOI-link below. This article may be used for non-commercial purposes in accordance with Wiley-VCH Terms and Conditions for self-archiving.
Language:English
Identification Number:
Last Modified:30 Jun 2016 11:03
Deposited On:21 Jun 2016 13:46

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