We employ the anti-Stokes surface-enhanced Raman scattering to show that the reactants in plasmon-catalyzed photochemical reactions are excited to overtone vibrational quantum states. We use the light intensity and wavelength dependence of the overtone quantum population to identify the non-thermal contribution to the overall activation and the activation mechanism.
Recent studies on plasmon-assisted chemical reactions postulate that the hot carriers of plasmon-excited nanostructures may induce a non-thermal vibrational activation of metal-bound reactants. However, a quantitative validation at the level of molecular quantum states is currently missing. I will present our recent spectroscopic studies on metal-bound reactants, which directly proves the non-thermal vibrational molecular excitations caused by plasmons.
High efficiency OLEDs based on phosphorescent, thermally activated delayed fluorescent (TADF) and fluorescent emitters will be presented. We will show that EQEs over 60% is achievable if OLEDs are fabricated using organic semiconductors with the refractive indices of 1.5 and fully horizontal emitting dipoles without any extra light extracting structure. We will also show that reverse intersystem crossing RISC rate plays an important role to reduce the efficiency roll-off in efficient TADF and fluorescent OLEDs and a couple to methods will be presented to increase the RISC rate in the devices.
In this study, we demonstrate a blue OLED with the EQE of 34% and power efficiency of 79.6 lm W-1 using low refractive index electron transporting layer which are the highest efficiencies ever reported in blue OLEDs. In addition, we quantitatively calculated maximum achievable outcoupling efficiencies according to change of refractive indices, which can be used to estimate the achievable outcoupling efficiency of OLEDs without fabrication. The simulation indicates that EQE over 60% can be achievable in PhOLEDs if refractive indices of consisting organic materials’ are close to 1.5.
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