Anti‐Kasha Emission in Organic Radicals: Mechanistic Insights and Experimental Caveats

Organic radicals have recently emerged as promising candidates for luminescent materials, often exhibiting emissions that challenge the traditional Kasha's rule. While a growing number of reports claim anti‐Kasha emission from higher excited states in radicals, the photophysical origins of such emissions remain ambiguous. In this Concept, we critically assess the mechanistic underpinnings of anti‐Kasha behavior in radical systems and highlight the experimental caveats that may lead to misinterpretation—including emission from closed‐shell impurities, photodegradation byproducts, or incomplete radical formation. By revisiting key examples and providing a framework for rigorous spectral validation, this article aims to recalibrate the standards of evidence in radical photophysics and guide the development of reliable design strategies for high‐energy emitters.

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Publication Details

Journal
ChemPhotoChem
Published
2025-05-19
DOI
https://doi.org/10.1002/cptc.202500118
Citations
2
Primary Topic
Organic Light-Emitting Diodes Research
Type
article
Field-Weighted Citation Impact
1.46

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article

Anti‐Kasha Emission in Organic Radicals: Mechanistic Insights and Experimental Caveats

Qiming Peng, Yujie Zhu, Alim Abdurahman, Zhiyuan Kuang et al.
2 citations
ChemPhotoChem
Organic Light-Emitting Diodes Research
1.46
article

Anti‐Kasha Emission in Organic Radicals: Mechanistic Insights and Experimental Caveats

Qiming Peng, Yujie Zhu, Alim Abdurahman, Zhiyuan Kuang, Zihao Zhu, Shengjie Wang
article en
2 citations

Abstract

Organic radicals have recently emerged as promising candidates for luminescent materials, often exhibiting emissions that challenge the traditional Kasha's rule. While a growing number of reports claim anti‐Kasha emission from higher excited states in radicals, the photophysical origins of such emissions remain ambiguous. In this Concept, we critically assess the mechanistic underpinnings of anti‐Kasha behavior in radical systems and highlight the experimental caveats that may lead to misinterpretation—including emission from closed‐shell impurities, photodegradation byproducts, or incomplete radical formation. By revisiting key examples and providing a framework for rigorous spectral validation, this article aims to recalibrate the standards of evidence in radical photophysics and guide the development of reliable design strategies for high‐energy emitters.

ChemPhotoChemVol. 9(8)
Nanjing Tech University (CN), Jilin University (CN), State Key Laboratory on Integrated Optoelectronics (CN)
Natural Science Foundation of Jilin Province, National Natural Science Foundation of China, Government of Jiangsu Province, People's Government of Jilin Province, Nanjing Tech University, National Outstanding Youth Science Fund Project of National Natural Science Foundation of China, National Key Research and Development Program of China
Openalex Percentile: Top 17%
Organic Light-Emitting Diodes Research
1.46
DOIOpen Access PDFOpenAlex
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Anti‐Kasha Emission in Organic Radicals: Mechanistic Insights and Experimental Caveats — Qiming Peng, Yujie Zhu, et al. · ChemPhotoChem (2025) | TGRS Research Map | TGRS