Acetylene Functionalization of Multiple‐Resonant Materials Enabling Strong Two‐Photon Absorption and Delayed Luminescence With Highly Efficient Exciplex‐Sensitized Electroluminescence
Two‐photon absorbing (2PA) luminophores with narrowband emission are rare despite growing demand for color‐pure optoelectronic materials. Multiple‐resonance thermally activated delayed fluorescence (MR‐TADF) emitters offer intrinsically narrow emission, but their nonlinear optical response remains largely unexplored. W...