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Sensitized ligand narrow-band phosphorescence for high-efficiency solution-processed OLEDs

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Abstract

Narrow-band emission is crucial for high color purity in panel display. Nevertheless, attaining narrow-band emission is highly challenging because either thermally activated delayed fluorescence or phosphorescence in organic and metal-organic compounds originates primarily from multiple charge transfer transitions featured with broad bandwidths. In this work, a general tactic for achieving highly efficient narrow-band emission is proposed by the sensitization of ligand-centered phosphorescence through substantial intermetallic interaction. Relative to weak phosphorescence in mononuclear Pt(II) precursors, highly efficient ligand-centered phosphorescence is dramatically activated in Pt(II)-Au(I) heteronuclear complexes with quantum yield as high as 81% in solutions and 97% in doping films. High-efficiency solution-processed organic light-emitting diodes (OLEDs) with narrow-band emission are successfully attained with external quantum efficiency (EQE) of 21.6% and a full width at half maxima (FWHM) of 36 nm for yellow electroluminescence and EQE of 20.8% and FWHM of 32 nm for green electroluminescence.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (92061202 and 21801242), the Fujian Science and Technology Project (2020L3022), and the Strategic Priority Research Program of Chinese Academy of Sciences (XDB20000000).

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Authors and Affiliations

  1. State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, China

    Qian Wang, Jin-Yun Wang, Hao Zeng, Li-Yi Zhang & Zhong-Ning Chen

  2. Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou, 350108, China

    Zhong-Ning Chen

  3. University of Chinese Academy of Sciences, Beijing, 100039, China

    Qian Wang & Hao Zeng

Authors
  1. Qian Wang
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  2. Jin-Yun Wang
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  3. Hao Zeng
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  4. Li-Yi Zhang
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  5. Zhong-Ning Chen
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Correspondence to Zhong-Ning Chen.

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Supporting information The supporting information is available online at http://chem.scichina.com and http://link.springer.com/journal/11426. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.

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Wang, Q., Wang, JY., Zeng, H. et al. Sensitized ligand narrow-band phosphorescence for high-efficiency solution-processed OLEDs. Sci. China Chem. 65, 1559–1568 (2022). https://doi.org/10.1007/s11426-022-1301-3

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  • DOI: https://doi.org/10.1007/s11426-022-1301-3

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