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Recent advances in highly-efficient near infrared OLED emitters

dos Santos, Paloma L.; Stachelek, Patrycja; Takeda, Youhei; Pander, Piotr

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Authors

Paloma L. dos Santos

Profile image of Patrycja Brook

Dr Patrycja Brook patrycja.stachelek@durham.ac.uk
Royal Society University Research Fellow

Youhei Takeda



Abstract

Near infrared (NIR) light (700–1400 nm) can be used in numerous biological/medical as well as technological applications. In this work we review the most recent examples of highly efficient NIR organic light-emitting diode (OLED) emitters among the most relevant types of luminophores: platinum(II), iridium(III), and osmium(II) complexes, unimolecular thermally activated delayed fluorescence (TADF) emitters and exciplexes, fluorescent dyes, and the emerging group of stable luminescent radicals. We dive into the structural design principles of emitters with improved NIR efficiency. In our discussion we consider unimolecular emission as well as that arising from aggregated luminophores, as the latter often leads to a longer wavelength NIR. Our analysis of numerous emitters from various groups concludes, without a doubt, that platinum(II) complexes present superior efficiency in nearly all wavelengths from 700 to 1000 nm. We report on an apparent NIR boundary line, which appears to be a current limitation for NIR OLED efficiency. Presently, virtually only platinum(II) complexes exceed the efficiency limit set out by this boundary. So far efficient OLEDs, i.e. >1% external quantum efficiency, emitting significantly beyond 1000 nm have not yet been reported.

Citation

dos Santos, P. L., Stachelek, P., Takeda, Y., & Pander, P. (2024). Recent advances in highly-efficient near infrared OLED emitters. Materials Chemistry Frontiers, 8(7), 1731-1766. https://doi.org/10.1039/d3qm01067h

Journal Article Type Article
Acceptance Date Jan 23, 2024
Online Publication Date Jan 26, 2024
Publication Date 2024
Deposit Date Apr 9, 2024
Publicly Available Date Apr 9, 2024
Journal Materials Chemistry Frontiers
Print ISSN 2052-1537
Electronic ISSN 2052-1537
Publisher Royal Society of Chemistry
Peer Reviewed Peer Reviewed
Volume 8
Issue 7
Pages 1731-1766
DOI https://doi.org/10.1039/d3qm01067h
Public URL https://durham-repository.worktribe.com/output/2380917

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