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Investigating underlying mechanism in spectral narrowing phenomenon induced by microcavity in organic light emitting diodes

Author

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  • Miaosheng Wang

    (Beijing Jiaotong University
    University of Tennessee)

  • Jie Lin

    (Chinese Academy of Sciences)

  • Yu-Che Hsiao

    (University of Tennessee)

  • Xingyuan Liu

    (Chinese Academy of Sciences)

  • Bin Hu

    (Beijing Jiaotong University
    University of Tennessee)

Abstract

This paper reports our experimental studies on the underlying mechanism responsible for electroluminescence spectral narrowing phenomenon in the cavity-based organic light-emitting diodes. It is found that the microcavity generates an emerging phenomenon: a magneto-photoluminescence signal in Poly(9,9-dioctylfluorene-alt-benzothiadiazole) polymer under photoexcitation, which is completely absent when microcavity is not used. This provides an evidence that microcavity leads to the formation of spatially extended states, functioning as the intermediate states prior to the formation of Frenkel excitons in organic materials. This is confirmed by the magneto-electroluminescence solely observed from the cavity-based light-emitting diodes under electrical injection. Furthermore, the narrowed electroluminescence output shows a linear polarization, concurrently occurred with magneto-electroluminescence. This indicates that the spatially extended sates become aligned towards forming coherent light-emitting excitons within the microcavity through optical resonance. Clearly, the spatially extended states present the necessary condition to realize electroluminescence spectral narrowing phenomenon towards lasing actions in cavity-based organic light-emitting diodes.

Suggested Citation

  • Miaosheng Wang & Jie Lin & Yu-Che Hsiao & Xingyuan Liu & Bin Hu, 2019. "Investigating underlying mechanism in spectral narrowing phenomenon induced by microcavity in organic light emitting diodes," Nature Communications, Nature, vol. 10(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-09585-0
    DOI: 10.1038/s41467-019-09585-0
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    Cited by:

    1. Raj Pandya & Richard Y. S. Chen & Qifei Gu & Jooyoung Sung & Christoph Schnedermann & Oluwafemi S. Ojambati & Rohit Chikkaraddy & Jeffrey Gorman & Gianni Jacucci & Olimpia D. Onelli & Tom Willhammar &, 2021. "Microcavity-like exciton-polaritons can be the primary photoexcitation in bare organic semiconductors," Nature Communications, Nature, vol. 12(1), pages 1-11, December.
    2. Ruixiang Chen & Ningning Liang & Tianrui Zhai, 2024. "Dual-color emissive OLED with orthogonal polarization modes," Nature Communications, Nature, vol. 15(1), pages 1-11, December.
    3. Hong Wang & Baipeng Yin & Junli Bai & Xiao Wei & Wenjin Huang & Qingda Chang & Hao Jia & Rui Chen & Yaxin Zhai & Yuchen Wu & Chuang Zhang, 2024. "Giant magneto-photoluminescence at ultralow field in organic microcrystal arrays for on-chip optical magnetometer," Nature Communications, Nature, vol. 15(1), pages 1-9, December.

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