Anomalously bright single-molecule upconversion electroluminescence

Yang Luo, Fan-Fang Kong, Xiao-Jun Tian, Yun-Jie Yu, Shi-Hao Jing, Chao Zhang, Gong Chen (), Yang Zhang, Yao Zhang, Xiao-Guang Li, Zhen-Yu Zhang and Zhen-Chao Dong ()
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Yang Luo: University of Science and Technology of China
Fan-Fang Kong: University of Science and Technology of China
Xiao-Jun Tian: University of Science and Technology of China
Yun-Jie Yu: University of Science and Technology of China
Shi-Hao Jing: University of Science and Technology of China
Chao Zhang: University of Science and Technology of China
Gong Chen: University of Science and Technology of China
Yang Zhang: University of Science and Technology of China
Yao Zhang: University of Science and Technology of China
Xiao-Guang Li: Shenzhen University
Zhen-Yu Zhang: University of Science and Technology of China
Zhen-Chao Dong: University of Science and Technology of China

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Efficient upconversion electroluminescence is highly desirable for a broad range of optoelectronic applications, yet to date, it has been reported only for ensemble systems, while the upconversion electroluminescence efficiency remains very low for single-molecule emitters. Here we report on the observation of anomalously bright single-molecule upconversion electroluminescence, with emission efficiencies improved by more than one order of magnitude over previous studies, and even stronger than normal-bias electroluminescence. Intuitively, the improvement is achieved via engineering the energy-level alignments at the molecule−substrate interface so as to activate an efficient spin-triplet mediated upconversion electroluminescence mechanism that only involves pure carrier injection steps. We further validate the intuitive picture with the construction of delicate electroluminescence diagrams for the excitation of single-molecule electroluminescence, allowing to readily identify the prerequisite conditions for producing efficient upconversion electroluminescence. These findings provide deep insights into the microscopic mechanism of single-molecule upconversion electroluminescence and organic electroluminescence in general.

Date: 2024
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DOI: 10.1038/s41467-024-45450-5

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