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The impact of donor-orientation on the emission properties of chlorinated trityl radicals

Chlorinated trityl radicals functionalized with electron-donating groups are promising red-emitting materials for optoelectronic and spintronic applications, overcoming the spin-statistical limit of conventional emitters. Donor functionalization induces charge transfer character, enhancing photolumi...

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Main Authors: Arnold, Mona E. (Author) , Toews, Robert (Author) , Schneider, Lars (Author) , Schmid, Jonas (Author) , Putra, Miftahussurur Hamidi (Author) , Busch, Michael (Author) , Groß, Axel (Author) , Deschler, Felix (Author) , Köhn, Andreas (Author) , Kuehne, Alexander J. C. (Author)
Format: Article (Journal)
Language:English
Published: July 4, 2025
In: Advanced optical materials
Year: 2025, Volume: 13, Issue: 19, Pages: 1-9
ISSN:2195-1071
DOI:10.1002/adom.202500296
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1002/adom.202500296
Verlag, kostenfrei, Volltext: https://onlinelibrary.wiley.com/doi/abs/10.1002/adom.202500296
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Author Notes:Mona E. Arnold, Robert Toews, Lars Schneider, Jonas Schmid, Miftahussurur Hamidi Putra, Michael Busch, Axel Groß, Felix Deschler, Andreas Köhn, and Alexander J.C. Kuehne
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Summary:Chlorinated trityl radicals functionalized with electron-donating groups are promising red-emitting materials for optoelectronic and spintronic applications, overcoming the spin-statistical limit of conventional emitters. Donor functionalization induces charge transfer character, enhancing photoluminescence quantum yield, which depends on the donor strength and its orientation. However, donor-functionalized tris(trichlorophenyl)methyl radicals often show lower quantum yield than their perchlorinated derivatives, likely due to weaker donor-acceptor electronic coupling and enhanced non-radiative decay. A novel trityl derivative is presented with two additional chlorines that restrict the orientation of the donor to a nearly perpendicular arrangement toward the trityl plane, minimizing vibronic coupling and non-radiative losses. Spectroscopic and computational studies reveal that this steric constraint improves the photoluminescence quantum yield compared to the tris(trichlorophenyl)methyl analogs. These findings highlight the potential of donor-acceptor decoupling to enable efficient, redshifted emission, offering a design strategy for high-performance radical emitters.
Item Description:Zuerst veröffentlicht: 21. April 2025
Gesehen am 07.10.2025
Physical Description:Online Resource
ISSN:2195-1071
DOI:10.1002/adom.202500296

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