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Enhancing Reverse Intersystem Crossing in TSCT-TADF Emitters: Heavy Atom Modulation of Multiresonance Acceptors.
J Phys Chem A
January 2025
Institute of Nanoscience and Engineering, Henan University, Kaifeng, Henan 475004, China.
With the rapid development of thermally activated delayed fluorescence (TADF) materials, achieving efficient reverse intersystem crossing (RISC) to mitigate triplet-triplet annihilation has emerged as a prominent research focus. This study investigates five derivative molecules, featuring varied bridging atoms/groups (O, S, Se, -CH-), designed from the reported TADF molecule with through-space charge transfer (TSCT) properties. Utilizing time-dependent density functional theory coupled with a PCM solution model, their excited state behaviors were simulated in a toluene environment.
View Article and Find Full Text PDFTime evolution of a pumped molecular magnet-A time-resolved inelastic neutron scattering study.
Proc Natl Acad Sci U S A
January 2025
William H. Miller III Department of Physics and Astronomy, The Johns Hopkins University, Baltimore, MD 21218.
Introducing an experimental technique of time-resolved inelastic neutron scattering (TRINS), we explore the time-dependent effects of resonant pulsed microwaves on the molecular magnet CrFPiv. The octagonal rings of magnetic Cr atoms with antiferromagnetic interactions form a singlet ground state with a weakly split triplet of excitations at 0.8 meV.
View Article and Find Full Text PDFTandem Versus Single Autologous Stem Cell Transplantation for High-Risk Multiple Myeloma in the Era of Novel Agents: A Real-World Study of China.
Cancer Med
January 2025
Peking University People's Hospital, Peking University Institute of Hematology, National Clinical Research Center for Hematologic Disease, Beijing Key Laboratory of Hematopoietic Stem Cell Transplantation, Peking University, Beijing, China.
Background: This study compares the efficacy and safety of single autologous stem cell transplantation (ASCT) versus tandem ASCT for multiple myeloma (MM) patients in the era of novel agents.
Methods: A total of 112 high-risk MM patients were included (single ASCT, (n = 57) or tandem ASCT(n = 55) in this retrospective multicenter study. Responses and outcomes were evaluated.
Boosting Hot Electron Generation in Energy Center Embedded Metal-Organic Frameworks for Photocatalysis.
Small
January 2025
Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, Anhui, 230026, P. R. China.
The ligands in metal-organic framework (MOF) play as light absorption center and transfer photogenerated electrons to metal node through ligand-to-metal charge transfer (LMCT) during photocatalysis, and energy utilization efficiency is strongly restricted by the light inertness of ligands. Herein, a ligand updating strategy is proposed by inserting energy centers to MOFs to activate the inherent ligands, realizing boosting hot electron generation and photocatalytic activities via the cascaded proceeding of energy transfer and charge transfer. By taking PCN-777 (a zeotype mesoporous Zr-containing MOF) as an example, this study shows that the embedded energy center of 1-pyrenecarboxylic acid (PCA) can activate the inherent ligand of PCN-777 through triplet-triplet energy transfer, where triplet excitons would dissociate into photocarriers migrating to the Zr metal cluster via LMCT process.
View Article and Find Full Text PDFExploring the Versatile Uses of Triplet States: Working Principles, Limitations, and Recent Progress in Phosphorescence, TADF, and TTA.
ACS Appl Opt Mater
December 2024
Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield S1 3JD, U.K.
Triplet excited states in organic semiconductors are usually optically dark and long-lived as they have a spin-forbidden transition to the singlet ground state and therefore hinder processes in light-harvesting applications. Also, triplets often cause damage to the system as they can sensitize the formation of reactive singlet oxygen. Despite these unfavorable characteristics, there exist mechanisms through which we can utilize triplet states, and that constitutes the scope of this review.
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