DataVXAdvanced Optical MaterialsPaper
journal article·2025-04Open access

Helical Ladder Oligomers Exhibit Amplified Circularly Polarized Emission

Christoffer Bræstrup, Xiao Xiao, Francisco García‐González, Theis Brock‐Nannestad, Daniel Aranda, Si Tong Bao, Daniel Cavlovic, Haoyu Jiang, Fay Ng, Colin Nuckolls, Fabrizio Santoro, Michael Pittelkow

Advanced Optical Materials· Volume 13· Issue 12
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Source abstract

Abstract

Abstract Establishing design principles to engineer molecules that exhibit strong circularly polarized luminescence (CPL)‐brightness across the UV, visible and NIR spectral range remains an unsolved challenge. To achieve a large CPL‐brightness, the main difficulty is to optimize the luminescence dissymmetry factor glum. Herein is described the discovery that a multi‐helicene system based on a series of annulated [6]helicenes and perylenediimides, exhibits larger‐than‐linear amplification of glum with helicene length. Large enhanced fluorescent quantum yields and large extinction coefficients are also observed for this length series. Consequently, this series of oligomers exhibit exceptional CPL brightness (BCPL) above 1 × 103 mol−1 cm−1. Using computational methods based on density functional theory (DFT), the experimental trend shows that the increase of glum is due to the progressive alignment of magnetic (|m|) and electric transition (|µ|) dipole moment vectors, as the helical backbone grows longer.
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Research context

OpenAlex topics: Synthesis and Properties of Aromatic Compounds · Fullerene Chemistry and Applications · Luminescence and Fluorescent Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Department of Chemistry University of Copenhagen Universitetsparken 5 Copenhagen Ø 2100 Denmark

Department of Chemistry Columbia University New York NY 10027 USA

Key Laboratory of Green Chemistry & Technology Ministry of Education College of Chemistry Sichuan University Chengdu 610064 China

Andalucía Tech Facultad de Ciencias Departamento de Química Física Universidad de Málaga Málaga 29071 Spain

Istituto di Chimica dei Composti Organometallici (ICCOM‐CNR) Area della Ricerca del CNR Via Moruzzi 1 Pisa I‐56124 Italy

Funding

Fundamental Research Funds for the Central Universities · Teknologi og Produktion, Det Frie Forskningsråd · Danmarks Frie Forskningsfond · National Natural Science Foundation of China · Defense Advanced Research Projects Agency · National Science Foundation

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