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Organic luminescent radicals enable bright circularly polarized light in the near-infrared region

Phys · · 635 words · By Kyushu University

Researchers at Kyushu University have developed a new series of chiral luminescent radicals that emit bright circularly polarized light in the red to near-infrared spectrum. The study, published in Angewandte Chemie International Edition, demonstrates improvements in emission efficiency, photostability, and stability compared to conventional radicals.

open_in_new Read the original article: https://phys.org/news/2026-05-luminescent-radicals-enable-bright-circularly.html

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Propaganda Score
confidence: 100%
Low risk. This article shows minimal use of propaganda techniques.

fact_checkFact-Check Results

10 claims extracted and verified against multiple sources including cross-references, web search, and Wikipedia.

check_circle Corroborated 5
info Single Source 3
help Insufficient Evidence 2
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“researchers at Kyushu University, Japan, have developed a new type of organic material that emits CPL in the deep-red to near-infrared region of the spectrum.”
CORROBORATED
Multiple independent web search results confirm that researchers at Kyushu University developed organic materials emitting CPL in the deep-red to near-infrared region.
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wikipedia NEUTRAL — Kyushu University (九州大学 Kyūshū Daigaku) in Fukuoka, Japan, was established as Fukuoka Medical College in 1903, which was affiliated with Kyoto Imperial University. Kyushu Imperial University was found…
https://en.wikipedia.org/wiki/Campus_of_Kyushu_University
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wikipedia NEUTRAL — Kyushu (九州, Kyūshū; pronounced [kʲɯꜜː.ɕɯː] , lit. 'nine provinces') is the third-largest and most southerly of Japan's four main islands. In the past, it has been known as Kyūkoku (九国, "Nine Countries…
https://en.wikipedia.org/wiki/Kyushu
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wikipedia NEUTRAL — Kyushu University (九州大学, Kyūshū Daigaku), abbreviated to Kyudai (九大, Kyūdai), is a public research university located in Fukuoka, Japan, on the island of Kyushu. Founded in 1911 as the fourth Imperial…
https://en.wikipedia.org/wiki/Kyushu_University
+ 3 more evidence sources
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“Published in Angewandte Chemie International Edition, the study describes a series of molecules classified as chiral luminescent radicals that combine high emission efficiency, durability, and stability.”
SINGLE SOURCE
While the general research is mentioned in web results, the specific detail about the publication in 'Angewandte Chemie International Edition' and the specific classification of 'chiral luminescent radicals' is not independently corroborated by the provided evidence snippets (which mostly contain generic study tool ads or general journal descriptions).
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wikipedia NEUTRAL — Orthogonality is a term with various meanings depending on the context. In mathematics, orthogonality is the generalization of the geometric notion of perpendicularity. Although many authors use the t…
https://en.wikipedia.org/wiki/Orthogonality
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wikipedia NEUTRAL — Susumu Kitagawa (北川 進, Kitagawa Susumu; born 4 July 1951) is a Japanese Nobel Prize-winning chemist specializing in coordination chemistry, with a focus on organic–inorganic hybrid compounds and the …
https://en.wikipedia.org/wiki/Susumu_Kitagawa
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wikipedia NEUTRAL — Angewandte Chemie (German pronunciation: [ˈaŋɡəˌvantə çeˈmiː], meaning "Applied Chemistry") is a weekly peer-reviewed scientific journal that is published by Wiley-VCH on behalf of the German Chemical…
https://en.wikipedia.org/wiki/Angewandte_Chemie
+ 3 more evidence sources
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“a research team led by Associate Professor Ken Albrecht of the Institute for Materials Chemistry and Engineering, Kyushu University, and including doctoral student Kazuhiro Nakamura of the Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, synthesized a new series of TTM radicals”
CORROBORATED
Web search results from kyushu-u.ac.jp and other academic sources confirm Ken Albrecht's role at the Institute for Materials Chemistry and Engineering, Kyushu University, and the synthesis of TTM radicals.
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web search NEUTRAL — One particular family of radicals, tris(2,4,6 ‑ trichlorophenyl)methyl (TTM)‑based radicals, is inherently chiral and a natural candidate for CPL.
https://www.kyushu-u.ac.jp/f/65821/20260427_Albrecht_HP.pdf
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web search NEUTRAL — New luminescent radicals (TTMs) based on terminal benzene ring modified carbazole donors were synthesized and evaluated. Their photostability (half-life under continuous laser irradiation) has improve…
https://pubmed.ncbi.nlm.nih.gov/36373670/
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web search NEUTRAL — Kyushu University. Institute for Materials Chemistry and Engineering. Ken Albrecht.We have synthesized a new carbazole oligomer (mono, di, tri, tetra) substituted luminescent tris (2,4,6-trichlorophen…
https://www.researchgate.net/profile/Ken-Albrecht-2
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“Starting with a bromine-containing derivative of TTM called TTBrM, the team incorporated a nitrogen-containing organic compound known as carbazole (Cz). This approach produced three carbazole-substituted TTM radicals: CzTTBrM, 2CzTTBrM, and 3CzTTBrM.”
SINGLE SOURCE
The evidence mentions TTM radicals and carbazole donors generally, but the specific nomenclature (CzTTBrM, 2CzTTBrM, 3CzTTBrM) is not explicitly corroborated across multiple independent sources in the provided snippets.
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web search NEUTRAL — Thirdly, covalent attachment of carbazole into the mesitylated radical gives very high photoluminescence yield of 93% in 4,4’-bis(carbazol-9-yl)-1,1’-biphenyl films and light-emitting diodes with maxi…
https://pmc.ncbi.nlm.nih.gov/articles/PMC10338495/
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web search NEUTRAL — Luminescent radicals represent a promising type of SOM for red and near-infrared circularly polarized luminescence (CPL) emission. One particular family of radicals, tris(2,4,6‑trichlorophenyl)methyl …
https://www.eurekalert.org/news-releases/1127197
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web search NEUTRAL — However, research on fluorescent radicals has seen new impetus. during the last decade, stimulated by the development of highly.amples of highly emissive donor-substituted PTM- and TTM-. based mono-ra…
https://www.researchgate.net/publication/391947914_On_the_ph…
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“emission now occurred through a charge-transfer process between the Cz donor and TTBrM acceptor, shifting the output into the red to near-infrared range of 650–800 nanometers (nm).”
CORROBORATED
Multiple sources confirm the charge-transfer process between the Cz donor and TTBrM acceptor and the resulting emission in the 650-800 nm range.
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wikipedia NEUTRAL — This article summarizes the events, album releases, and album release dates in hip-hop for the year 2024.
https://en.wikipedia.org/wiki/2024_in_hip-hop
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wikipedia NEUTRAL — Chromium(III) phosphate describes inorganic compounds with the chemical formula CrPO4·(H2O)n, where n = 0, 4, or 6. All are deeply colored solids. Anhydrous CrPO4 is green while the hexahydrate CrPO4…
https://en.wikipedia.org/wiki/Chromium(III)_phosphate
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web search NEUTRAL — Rather than a simple localized electronic transition, emission now occurred through a charge-transfer process between the Cz donor and TTBrM acceptor, shifting the output into the red to near-infrared…
https://www.eurekalert.org/news-releases/1127197
+ 2 more evidence sources
info
“Measurements of photoluminescence quantum yield... revealed values approximately 30 times greater in the best-performing compound than those reported for conventional chiral luminescent radicals.”
SINGLE SOURCE
The claim about a 30-fold increase in quantum yield is mentioned in the context of the research, but not corroborated by a second independent source in the provided evidence.
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wikipedia NEUTRAL — The .30-30 Winchester / 7.62×52mmR (officially named the .30 Winchester Center Fire or .30 WCF) cartridge was first marketed for the Winchester Model 1894 lever-action rifle in 1895. The .30-30 (prono…
https://en.wikipedia.org/wiki/.30-30_Winchester
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wikipedia NEUTRAL — 30 may refer to: 30 (number), the natural number following 29 and preceding 31 one of the years 30 BC, AD 30, 1930, 2030
https://en.wikipedia.org/wiki/30
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wikipedia NEUTRAL — The Thirty may refer to: David's Mighty Warriors, the retinue of the Biblical king David Thirty Tyrants, the Athenian oligarchy beginning in 404 BC Trial of the thirty, trial of anarchists in the Thi…
https://en.wikipedia.org/wiki/The_Thirty
+ 3 more evidence sources
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“photostability improved by approximately 100-fold, with the new radicals surviving over 1,300 seconds of continuous laser irradiation versus 19 seconds for TTBrM.”
CORROBORATED
Multiple independent news/web sources (Mirage News, EurekAlert!) report the 100-fold improvement in photostability and the specific timing (1,300s vs 19s).
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web search NEUTRAL — In addition, photostability improved by approximately 100-fold, with the new radicals surviving over 1,300 seconds of continuous laser irradiation versus 19 seconds for TTBrM.
https://www.eurekalert.org/news-releases/1127197
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web search NEUTRAL — In addition, photostability improved by approximately 100-fold, with the new radicals surviving over 1,300 seconds of continuous laser irradiation versus 19 seconds for TTBrM. The chirality of all thr…
https://www.miragenews.com/organic-radicals-emit-bright-near…
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web search NEUTRAL — In addition, photostability improved by approximately 100-fold, with the new radicals surviving over 1,300 seconds of continuous laser irradiation versus 19 seconds for TTBrM. The chirality of all thr…
https://www.semiconductor-digest.com/organic-luminescent-rad…
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“The chirality of all three compounds was also stable, exhibiting high barriers to racemization”
CORROBORATED
Multiple sources (Mirage News, EurekAlert!) explicitly state that the chirality of all three compounds was stable with high barriers to racemization.
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web search NEUTRAL — people act environmentally and what are the barriers to pro-.
https://www.tandfonline.com/doi/abs/10.1080/1350462022014540…
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web search NEUTRAL — Weak Interactions ,Tunneling Racemization and Chiral Stability. Article. Full-text available.A sequence of molecules with steadily decreasing δ should exhibit this transition to stable chirality and a…
https://www.researchgate.net/publication/245111045_Racemizat…
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web search NEUTRAL — The activation barrier of racemization was determined for atropisomeric 3,3′-bipyrroles and they are found to be configurationally stable.
https://www.academia.edu/122149122/Racemization_barriers_of_…
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“the researchers embedded the radicals in microscopic polystyrene spheres. When illuminated by a laser, these microspheres exhibited whispering gallery mode resonance”
INSUFFICIENT EVIDENCE
No evidence was found in the provided search results regarding polystyrene spheres or whispering gallery mode resonance.
help
“Kazuhiro Nakamura et al, Luminescent Donor‐Acceptor Radical With Propeller Chirality: Bright and Photostable Red Circularly Polarized Luminescence and Whispering Gallery Mode Resonance, Angewandte Chemie International Edition (2026). DOI: 10.1002/anie.1914320”
INSUFFICIENT EVIDENCE
No evidence was found to confirm the specific paper title, author list, or DOI in the provided search results.
info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.