DEPARTMENT OF APPLIED PHYSICS 126 Email ming-jie.li@polyu.edu.hk Qualification BSc (Lanzhou University) MSc (Lanzhou University) PhD (Nanyang Technological University) ORCID ID 0000-0003-0417-5089 Dr LI Mingjie Assistant Professor Research Overview Ultrafast optical spectroscopy for optoelectronics. Charge carrier, spin dynamics, energy transfer dynamics/mechanisms, nonlinear optics, strong-field light-matter interaction, novel photophysics in materials and optoelectronic devices. Low-dimensional semiconductor materials and device development for new-generation light-harvesting and lasing applications. Representative Publications • Laser Photonics Rev., 2023, 17, 2200557 • Nat. Photon., 2022, 16, 485 • Nat. Commun., 2022, 13, 6935 • Book “Halide Perovskite Lasers", Springer Nature, 2022 • Angew. Chem. Int. Ed., 2021, 60, 10957 • Nat. Commun., 2020, 11, 3361 • Book Chapter “The Photophysics of Halide Perovskite Solar Cells”, Wiley, 2018, 101-130 • Adv. Mater., 2019, 31, 1802486 • Adv. Mater., 2018, 30, 1707235 • Nat. Commun., 2018, 9, 4197 • Nat. Commun., 2017, 8, 14350 • Nat. Commun., 2015, 6, 8513 Recent Representative Results (a) In 2022, we achieved a multiple exciton generation (MEG)- driven internal photocurrent quantum efficiency exceeding 100% with a low threshold in perovskite quantum dots photoconductor for the first time under ultraviolet-light illumination. Our findings corroborate the potential importance of narrow-band gap perovskite QDs for developing highly efficient energy conversion optoelectronics. (b) In 2022, we observed the abnormal nonlinear absorption process in quasi-two-dimensional perovskite film with a low threshold conversion from reverse saturable absorption to saturable absorption. These results provide fresh insights into the NLA mechanisms in low-dimensional perovskites, which may pave a promising way to diversify the NLO material applications. (c) In 2021, with a single femtosecond laser pulse excitation, we achieved the double-pulsed stimulated emission with nearly Auger-free emission from metal-halide perovskite multiple quantum wells. These insights enable a fresh approach to multiply the ultrashort laser pulse by a low-threshold gain medium. (d) The schematic figures of our developed/applied ultrafast optical spectroscopy techniques in our lab, which mainly include pump/probe, micro-transient absorption, optical pump terahertz probe, and micro/macro-time-resolved photoluminescence. Patent • PCT/SG2017/050365 Achievement • Council Member of the Physical Society of Hong Kong (PSHK)
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