Donor-acceptor bulk-heterojunction sensitizer for efficient solid-state infrared-to-visible photon up-conversion

Pengqing Bi, Tao Zhang, Yuanyuan Guo, Jianqiu Wang, Xian Wei Chua, Zhihao Chen, Wei Peng Goh, Changyun Jiang, Elbert E. M. Chia, Jianhui Hou and Le Yang ()
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Pengqing Bi: Agency for Science, Technology and Research (A*STAR)
Tao Zhang: Institute of Chemistry Chinese Academy of Sciences
Yuanyuan Guo: Nanyang Technological University (NTU)
Jianqiu Wang: Institute of Chemistry Chinese Academy of Sciences
Xian Wei Chua: Agency for Science, Technology and Research (A*STAR)
Zhihao Chen: Institute of Chemistry Chinese Academy of Sciences
Wei Peng Goh: Agency for Science, Technology and Research (A*STAR)
Changyun Jiang: Agency for Science, Technology and Research (A*STAR)
Elbert E. M. Chia: Nanyang Technological University (NTU)
Jianhui Hou: Institute of Chemistry Chinese Academy of Sciences
Le Yang: Agency for Science, Technology and Research (A*STAR)

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Solid-state infrared-to-visible photon up-conversion is important for spectral-tailoring applications. However, existing up-conversion systems not only suffer from low efficiencies and a need for high excitation intensity, but also exhibit a limited selection of materials and complex fabrication processes. Herein, we propose a sensitizer with a bulk-heterojunction structure, comprising both an energy donor and an energy acceptor, for triplet-triplet annihilation up-conversion devices. The up-conversion occurs through charge separation at the donor-acceptor interface, followed by the formation of charge transfer state between the energy donor and annihilator following the spin statistics. The bulk-heterojunction sensitizer ensures efficient charge generation and low charge recombination. Hence, we achieve a highly efficient solid-state up-conversion device with 2.20% efficiency and low excitation intensity (10 mW cm−2) through a one-step solution method. We also demonstrate bright up-conversion devices on highly-flexible large-area substrates. This study introduces a simple and scalable platform strategy for fabricating efficient up-conversion devices.

Date: 2024
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DOI: 10.1038/s41467-024-50177-4

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