01938nas a2200193   4500008004100000022001400041245012200055210006900177260000800246300001600254490000700270520121800277100003301495700001801528700001501546700002601561700003001587856012701617       2021                        eng d  a2040-336400aExcimer to exciplex transition through realization of donor-acceptor interactions in luminescent solvent-free liquids0 aExcimer to exciplex transition through realization of donoraccep  cJUN  a10780-107840 v133 aLuminescent solvent-free organic liquids are known for their enhanced quantum yield, color tunability, and availability of a matrix for other dopants to generate hybrid luminescent materials with improved features for newer applications. Herein, we report a donor-acceptor based luminescent ``exciplex liquid'' by utilizing the slightly different electron affinity of the acceptor molecules. A red-shifted broad exciplex emission exhibited by the donor-acceptor pair even at a lower concentration of the acceptor (0.001 equiv.) indicates high efficiency in the solvent-free state. A detailed NMR study revealed weak intermolecular interactions between the donor and acceptor in the solvent-free matrix that stabilizes the exciplex liquid. The failure of structurally similar solid counterparts to form an exciplex confirms the advantage of the available supportive liquid matrix. Besides, the luminescent exciplex liquid is found efficient in sensing application, which is unachievable by either the individual liquids or their solid counterparts. Here, a transition of a donor-acceptor pair from a solid to solvent-free liquid results in a new hybrid liquid that can be an alternative for solid sensor materials.1 aWakchaure, Vivek, Chandrakan1 aGoudappagouda1 aDas, Tamal1 aRavindranathan, Sapna1 aBabu, Sukumaran, Santhosh  uhttps://library.ncl.res.in/content/excimer-exciplex-transition-through-realization-donor-acceptor-interactions-luminescent