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Control of exciton spin statistics through spin polarization in organic optoelectronic devices

Author

Listed:
  • Jianpu Wang

    (University of Cambridge, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UK)

  • Alexei Chepelianskii

    (University of Cambridge, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UK)

  • Feng Gao

    (University of Cambridge, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UK)

  • Neil C. Greenham

    (University of Cambridge, Cavendish Laboratory, J.J. Thomson Avenue, Cambridge CB3 0HE, UK)

Abstract

Spintronics based on organic semiconductor materials is attractive because of its rich fundamental physics and potential for device applications. Manipulating spins is obviously important for spintronics, and is usually achieved by using magnetic electrodes. Here we show a new approach where spin populations can be controlled primarily by energetics rather than kinetics. We find that exciton spin statistics can be substantially controlled by spin-polarizing carriers after injection using high magnetic fields and low temperatures, where the Zeeman energy is comparable with the thermal energy. By using this method, we demonstrate that singlet exciton formation can be suppressed by up to 53% in organic light-emitting diodes, and the dark conductance of organic photovoltaic devices can be increased by up to 45% due to enhanced formation of triplet charge-transfer states, leading to less recombination to the ground state.

Suggested Citation

  • Jianpu Wang & Alexei Chepelianskii & Feng Gao & Neil C. Greenham, 2012. "Control of exciton spin statistics through spin polarization in organic optoelectronic devices," Nature Communications, Nature, vol. 3(1), pages 1-6, January.
    • Handle: RePEc:nat:natcom:v:3:y:2012:i:1:d:10.1038_ncomms2194
    DOI: 10.1038/ncomms2194
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    1. Chong Wang & Bo Wu & Yang Li & Shen Zhou & Conghui Wu & Tianyang Dong & Ying Jiang & Zihui Hua & Yupeng Song & Wei Wen & Jianxin Tian & Yongqiang Chai & Rui Wen & Chunru Wang, 2024. "Aggregation promotes charge separation in fullerene-indacenodithiophene dyad," Nature Communications, Nature, vol. 15(1), pages 1-11, December.
    2. 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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