Liu, Xiaojie; Popli, Henna; Kwon, Ohyun; Malissa, Hans; Pan, Xin; Park, Bumwoo; Choi, Byoungki; Kim, Sunghan; Ehrenfreund, Eitan; Boehme, Christoph; Vardeny, Z. Valy published the artcile< Isotope Effect in the Magneto-Optoelectronic Response of Organic Light-Emitting Diodes Based on Donor-Acceptor Exciplexes>, Safety of 3-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine, the main research area is OLED magneto optoelectronic response donor acceptor exciplex; Rabi oscillations; electrically detected magnetic resonance; exciplexes; magneto-electroluminescence; organic light-emitting diodes (OLEDs); reverse intersystem crossing.
The isotope effect is studied in the magneto-electroluminescence (MEL) and pulsed elec. detected magnetic resonance of organic light-emitting diodes based on thermally activated delayed fluorescence (TADF) from donor-acceptor exciplexes that are either protonated (H) or deuterated (D). It is found that at ambient temperature, the exchange of H to D has no effect on the spin-dependent current and MEL responses in the devices. However, at cryogenic temperatures, where the reverse intersystem crossing (RISC) from triplet to singlet exciplex diminishes, a pronounced isotope effect is observed These results show that the RISC process is not governed by the hyperfine interaction as thought previously, but proceeds through spin-mixing in the triplet exciplex. The observations are corroborated by elec. detected transient spin nutation experiments that show relatively long dephasing time at ambient temperature, and interpreted in the context of a model that involves exchange and hyperfine interactions in the spin triplet exciplex. These findings deepen the understanding of the RISC process in TADF materials.
Advanced Materials (Weinheim, Germany) published new progress about Activation energy (of conductivity). 329214-79-1 belongs to class pyridine-derivatives, and the molecular formula is C11H16BNO2, Safety of 3-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)pyridine.