Triplet energy transfer from CuInS 2 /ZnS nanorods to organic molecules for photon upconversion

Authors:
  • KZKaiyuan Zhang
    Kaiyuan Zhang
  • XZXiangrong Zhang
    Xiangrong Zhang
  • CQChaochao Qin
    Chaochao Qin
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Abstract
Triplet sensitization of semiconductor nanocrystals is important in photocatalysis and photodynamic therapy. However, current photosensitizers often contain toxic or precious metals, making the development of environmentally benign nanocrystal-based systems challenging due to scarce suitable materials and insufficient understanding of excited-state transfer. Herein, we investigate triplet energy transfer from CuInS 2 /ZnS nanorods to surface-anchored 9-anthracene carboxylic acid acceptors, with a rate constant of 1.02 × 10 10 s −1 and 90% efficiency. Besides, the transferred spin-triplet states undergo triplet–triplet annihilation in the interfaced annihilator molecules of diphenyl anthracene, enabling photon upconversion with a threshold of 23.26 W/cm² and an efficiency of 6.8%. These findings highlight CuInS 2 /ZnS nanorods as nontoxic triplet sensitizers and provide a viable strategy for sustainable upconversion optoelectronic devices.
Funding Information
  • National Natural Science Foundation of China (12174090)
  • National Natural Science Foundation of China (12574286)
  • National Natural Science Foundation of China (12474029)
  • Natural Science Foundation of Hainan Province (262300421061)
  • Henan Province University Science and Technology Innovation Talent Support Plan (24HASTIT030)

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