Highlighted Works
I would like to introduce my research achievements.
Invited paper (Hiroaki Misawa Festschrift)
J. Phys. Chem. C., 2024, 128, 994
H.S. Kim et al., (Front Cover)
This study offers both experimental and theoretical insights into the comprehension of roll-off behaviors exhibited by a series of archetype charge transfer-type molecules. This advancement contributes to the development of a novel exciton quenching model for numerous organic luminescent candidates. To visually convey this aspect, the cover features a pictorial concept highlighting a metric guide reminiscent of the periodic table of elements.
Adv. Funct. Mater., 2021, 31, 2104646
H.S. Kim et al., (Back Cover)
This study aims to address the roll-off pheno-menon, associated with exciton annihilation, resulting from the triplet accumulation in OLEDs based on TADF emitters. Stepping away from the conventional molecular design, the study achieves the world's highest reverse intersystem crossing rate constant by enhancing the spin-orbit coupling matrix elements through the internal heavy atom effect.
Collaboration work with Dr. Park
Adv. Mater., 2020, 32, 2000936
M. Park#, H.S. Kim# et al., (Frontispiece)
This study reported the luminescence behavior of graphene quantum dots (GQDs). Note that the degree of oxidation within the GQD backbone plays a crucial role in a variation of energy difference between singlet and triplet state. This finding allows for the implementation of a series of luminescent behaviors, including fluorescence, RTP, and delayed fluorescence, within the same GQD molecular framework for the first time.
J. Phys. Chem. C., 2019, 123, 18283
H.S. Kim et al., (Supplementary Cover)
The work provides a quantitative understanding of exciton behaviors in TADF-based photo-sensitized systems and their application in OLEDs. With this, we realized the system having reverse intersystem crossing in competition with the Dexter channel, demonstrating an OLED with approximately 325% enhancement in its roll-off compared to a typical host-guest system, without any external quantum efficiency loss.
