Fig. 2: Structural design of narrow-band Eu(II)-based perovskitoids.
From: Suppressing electron–phonon coupling for narrow-band emitting Eu(II)-based perovskitoids
a Molecular structures (upper panel) and electrostatic potential (lower panel) of organic cations (Tetraethylammoniumwith TEt (color bar, −0.091-0.091 eV), triethylmethylammonium MeEt (color bar, −0.086–0.086 eV), Benzyltriethylammonium ByEt (color bar, −0.062–0.062 eV), 1-propenyl-3-methylimidazolium Emim (color bar, −0.033–0.033 eV), 1- ethyl-3-methylimidazolium Pmim (color bar, −0.028–0.028 eV)). b Crystal structures of TEtEuBr3 and Pmim2EuBr4 perovskitoids plotted using VESTA. c Local connection patterns of face-shared [EuBr6]4– octahedrons in as-prepared Eu(II)-based perovskitoids. Carbon, hydrogen, nitrogen, bromine and europium are shown in dark gray, light gray, nattier blue, purple and pink, respectively.
