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Paper on [nature] - Presenting the result of improving the efficiency and stability of 'PeLED’
Professor Lee Bo-ram

The National Research Foundation of Korea announced on March 11 that the paper 'Ligand-engineered bandgap stability in mixed-halide perovskite LEDs' by Professor Lee Bo-ram (Department of Physics) at Pukyong National University had been published in the international journal <Nature>. This paper is attracting attention by presenting the result of greatly improving the luminous efficiency and color stability of the Perovskite Light-Emitting Device (PeLED), which is emerging as a next-generation display following the organic light-emitting device (OLED). Prof. Lee has significantly improved the external quantum efficiency from 4.1% to 20.3% in this study conducted with international joint research teams at Oxford University in the UK, Cambridge University, the University of Oregon, and includes Pukyong National University and UNIST in Korea, it succeeded in developing red PeLED, which also secured high color stability. Perovskite nanocrystals from which surface defects were removed through ligand treatment showed 1.5 times higher luminous efficiency (photoluminescence quantum efficiency) than nanocrystals with surface defects, and when nanocrystals were applied to a light emitting elements, the external quantum efficiency was found to be greatly improved from 4.1% to 20.3%. In addition, the ligand-treated perovskite nanocrystalline light emitting display showed high color stability with a constant emission spectrum when the device was activated. Professor Lee said, "Through this research, we expect that the commercialization of PeLED will be accelerated to enable more realistic colors and realistic expressions required in the increasingly developing VR and AR fields as well as in displays such as TVs." Professor Lee, who was appointed as a professor of the Department of Physics at Pukyong National University in 2017, has published more than 40 SCI-level papers after his appointment. Among them, he has published articles such as <Nature (IF=(42.779)>, <Nano Energy (IF=16.602)>, <Journal of the American Chemical Society (IF=14.612)>, <Journal of Materials Chemistry A (IF=11.301)>, <ACS Nano (IF=14.588), lead author> as corresponding authors in eminent international journals. Currently, Professor Lee is actively conducting research activities with a total of 70 SCI papers related to research on optoelectronic devices such as light emitting displays and solar cells. He received a bachelor's degree from Ulsan University and a doctorate from UNIST.

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이보람 교수 brlee@pknu.ac.kr
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